703 lines
30 KiB
Lua
703 lines
30 KiB
Lua
-- primitives for editing drawings
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Drawing = {}
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geom = require 'geom'
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require 'drawing_tests'
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-- All drawings span 100% of some conceptual 'page width' and divide it up
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-- into 256 parts.
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function Drawing.draw(line)
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local pmx,pmy = App.mouse_x(), App.mouse_y()
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if pmx < Line_width and pmy > line.y and pmy < line.y+Drawing.pixels(line.h) then
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love.graphics.setColor(0.75,0.75,0.75)
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love.graphics.rectangle('line', Margin_left,line.y, Line_width-Margin_left,Drawing.pixels(line.h))
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if icon[Current_drawing_mode] then
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icon[Current_drawing_mode](Line_width-22, line.y+4)
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else
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icon[Previous_drawing_mode](Line_width-22, line.y+4)
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end
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if App.mouse_down(1) and love.keyboard.isDown('h') then
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draw_help_with_mouse_pressed(line)
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return
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end
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end
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if line.show_help then
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draw_help_without_mouse_pressed(line)
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return
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end
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local mx,my = Drawing.coord(pmx-Margin_left), Drawing.coord(pmy-line.y)
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for _,shape in ipairs(line.shapes) do
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assert(shape)
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if geom.on_shape(mx,my, line, shape) then
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love.graphics.setColor(1,0,0)
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else
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love.graphics.setColor(0,0,0)
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end
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Drawing.draw_shape(Margin_left,line.y, line, shape)
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end
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for i,p in ipairs(line.points) do
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if p.deleted == nil then
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if Drawing.near(p, mx,my) then
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love.graphics.setColor(1,0,0)
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love.graphics.circle('line', Drawing.pixels(p.x)+Margin_left,Drawing.pixels(p.y)+line.y, 4)
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else
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love.graphics.setColor(0,0,0)
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love.graphics.circle('fill', Drawing.pixels(p.x)+Margin_left,Drawing.pixels(p.y)+line.y, 2)
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end
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if p.name then
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-- TODO: clip
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local x,y = Drawing.pixels(p.x)+Margin_left+5, Drawing.pixels(p.y)+line.y+5
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love.graphics.print(p.name, x,y)
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if Current_drawing_mode == 'name' and i == line.pending.target_point then
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-- create a faint red box for the name
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love.graphics.setColor(1,0,0,0.1)
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local name_text
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-- TODO: avoid computing name width on every repaint
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if p.name == '' then
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name_text = Em
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else
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name_text = App.newText(love.graphics.getFont(), p.name)
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end
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love.graphics.rectangle('fill', x,y, App.width(name_text), Line_height)
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end
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end
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end
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end
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love.graphics.setColor(0.75,0.75,0.75)
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Drawing.draw_pending_shape(Margin_left,line.y, line)
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end
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function Drawing.draw_shape(left,top, drawing, shape)
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if shape.mode == 'freehand' then
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local prev = nil
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for _,point in ipairs(shape.points) do
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if prev then
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love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, Drawing.pixels(point.x)+left,Drawing.pixels(point.y)+top)
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end
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prev = point
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end
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elseif shape.mode == 'line' or shape.mode == 'manhattan' then
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local p1 = drawing.points[shape.p1]
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local p2 = drawing.points[shape.p2]
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love.graphics.line(Drawing.pixels(p1.x)+left,Drawing.pixels(p1.y)+top, Drawing.pixels(p2.x)+left,Drawing.pixels(p2.y)+top)
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elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then
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local prev = nil
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for _,point in ipairs(shape.vertices) do
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local curr = drawing.points[point]
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if prev then
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love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, Drawing.pixels(curr.x)+left,Drawing.pixels(curr.y)+top)
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end
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prev = curr
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end
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-- close the loop
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local curr = drawing.points[shape.vertices[1]]
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love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, Drawing.pixels(curr.x)+left,Drawing.pixels(curr.y)+top)
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elseif shape.mode == 'circle' then
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-- TODO: clip
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local center = drawing.points[shape.center]
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love.graphics.circle('line', Drawing.pixels(center.x)+left,Drawing.pixels(center.y)+top, Drawing.pixels(shape.radius))
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elseif shape.mode == 'arc' then
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local center = drawing.points[shape.center]
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love.graphics.arc('line', 'open', Drawing.pixels(center.x)+left,Drawing.pixels(center.y)+top, Drawing.pixels(shape.radius), shape.start_angle, shape.end_angle, 360)
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elseif shape.mode == 'deleted' then
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-- ignore
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else
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print(shape.mode)
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assert(false)
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end
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end
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function Drawing.draw_pending_shape(left,top, drawing)
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local shape = drawing.pending
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if shape.mode == nil then
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-- nothing pending
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elseif shape.mode == 'freehand' then
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Drawing.draw_shape(left,top, drawing, shape)
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elseif shape.mode == 'line' then
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local mx,my = Drawing.coord(App.mouse_x()-left), Drawing.coord(App.mouse_y()-top)
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if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
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return
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end
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local p1 = drawing.points[shape.p1]
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love.graphics.line(Drawing.pixels(p1.x)+left,Drawing.pixels(p1.y)+top, Drawing.pixels(mx)+left,Drawing.pixels(my)+top)
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elseif shape.mode == 'manhattan' then
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local mx,my = Drawing.coord(App.mouse_x()-left), Drawing.coord(App.mouse_y()-top)
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if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
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return
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end
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local p1 = drawing.points[shape.p1]
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if math.abs(mx-p1.x) > math.abs(my-p1.y) then
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love.graphics.line(Drawing.pixels(p1.x)+left,Drawing.pixels(p1.y)+top, Drawing.pixels(mx)+left,Drawing.pixels(p1.y)+top)
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else
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love.graphics.line(Drawing.pixels(p1.x)+left,Drawing.pixels(p1.y)+top, Drawing.pixels(p1.x)+left,Drawing.pixels(my)+top)
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end
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elseif shape.mode == 'polygon' then
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-- don't close the loop on a pending polygon
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local prev = nil
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for _,point in ipairs(shape.vertices) do
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local curr = drawing.points[point]
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if prev then
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love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, Drawing.pixels(curr.x)+left,Drawing.pixels(curr.y)+top)
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end
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prev = curr
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end
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love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, App.mouse_x(),App.mouse_y())
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elseif shape.mode == 'rectangle' then
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local pmx,pmy = App.mouse_x(), App.mouse_y()
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local first = drawing.points[shape.vertices[1]]
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if #shape.vertices == 1 then
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love.graphics.line(Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top, pmx,pmy)
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return
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end
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local second = drawing.points[shape.vertices[2]]
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local mx,my = Drawing.coord(pmx-left), Drawing.coord(pmy-top)
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local thirdx,thirdy, fourthx,fourthy = Drawing.complete_rectangle(first.x,first.y, second.x,second.y, mx,my)
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love.graphics.line(Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top, Drawing.pixels(second.x)+left,Drawing.pixels(second.y)+top)
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love.graphics.line(Drawing.pixels(second.x)+left,Drawing.pixels(second.y)+top, Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top)
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love.graphics.line(Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top, Drawing.pixels(fourthx)+left,Drawing.pixels(fourthy)+top)
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love.graphics.line(Drawing.pixels(fourthx)+left,Drawing.pixels(fourthy)+top, Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top)
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elseif shape.mode == 'square' then
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local pmx,pmy = App.mouse_x(), App.mouse_y()
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local first = drawing.points[shape.vertices[1]]
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if #shape.vertices == 1 then
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love.graphics.line(Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top, pmx,pmy)
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return
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end
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local second = drawing.points[shape.vertices[2]]
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local mx,my = Drawing.coord(pmx-left), Drawing.coord(pmy-top)
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local thirdx,thirdy, fourthx,fourthy = Drawing.complete_square(first.x,first.y, second.x,second.y, mx,my)
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love.graphics.line(Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top, Drawing.pixels(second.x)+left,Drawing.pixels(second.y)+top)
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love.graphics.line(Drawing.pixels(second.x)+left,Drawing.pixels(second.y)+top, Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top)
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love.graphics.line(Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top, Drawing.pixels(fourthx)+left,Drawing.pixels(fourthy)+top)
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love.graphics.line(Drawing.pixels(fourthx)+left,Drawing.pixels(fourthy)+top, Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top)
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elseif shape.mode == 'circle' then
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local center = drawing.points[shape.center]
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local mx,my = Drawing.coord(App.mouse_x()-left), Drawing.coord(App.mouse_y()-top)
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if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
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return
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end
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local cx,cy = Drawing.pixels(center.x)+left, Drawing.pixels(center.y)+top
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love.graphics.circle('line', cx,cy, geom.dist(cx,cy, App.mouse_x(),App.mouse_y()))
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elseif shape.mode == 'arc' then
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local center = drawing.points[shape.center]
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local mx,my = Drawing.coord(App.mouse_x()-left), Drawing.coord(App.mouse_y()-top)
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if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
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return
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end
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shape.end_angle = geom.angle_with_hint(center.x,center.y, mx,my, shape.end_angle)
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local cx,cy = Drawing.pixels(center.x)+left, Drawing.pixels(center.y)+top
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love.graphics.arc('line', 'open', cx,cy, Drawing.pixels(shape.radius), shape.start_angle, shape.end_angle, 360)
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elseif shape.mode == 'move' then
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-- nothing pending; changes are immediately committed
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elseif shape.mode == 'name' then
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-- nothing pending; changes are immediately committed
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else
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print(shape.mode)
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assert(false)
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end
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end
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function Drawing.in_drawing(drawing, x,y)
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if drawing.y == nil then return false end -- outside current page
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return y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= Margin_left and x < Line_width
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end
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function Drawing.mouse_pressed(drawing, x,y, button)
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if Current_drawing_mode == 'freehand' then
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drawing.pending = {mode=Current_drawing_mode, points={{x=Drawing.coord(x-Margin_left), y=Drawing.coord(y-drawing.y)}}}
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elseif Current_drawing_mode == 'line' or Current_drawing_mode == 'manhattan' then
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local j = Drawing.insert_point(drawing.points, Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y))
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drawing.pending = {mode=Current_drawing_mode, p1=j}
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elseif Current_drawing_mode == 'polygon' or Current_drawing_mode == 'rectangle' or Current_drawing_mode == 'square' then
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local j = Drawing.insert_point(drawing.points, Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y))
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drawing.pending = {mode=Current_drawing_mode, vertices={j}}
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elseif Current_drawing_mode == 'circle' then
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local j = Drawing.insert_point(drawing.points, Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y))
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drawing.pending = {mode=Current_drawing_mode, center=j}
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elseif Current_drawing_mode == 'move' then
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-- all the action is in mouse_released
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elseif Current_drawing_mode == 'name' then
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-- nothing
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else
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print(Current_drawing_mode)
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assert(false)
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end
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end
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-- a couple of operations on drawings need to constantly check the state of the mouse
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function Drawing.update()
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if Lines.current_drawing == nil then return end
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local drawing = Lines.current_drawing
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assert(drawing.mode == 'drawing')
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local x, y = App.mouse_x(), App.mouse_y()
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if App.mouse_down(1) then
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if Drawing.in_drawing(drawing, x,y) then
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if drawing.pending.mode == 'freehand' then
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table.insert(drawing.pending.points, {x=Drawing.coord(App.mouse_x()-Margin_left), y=Drawing.coord(App.mouse_y()-drawing.y)})
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elseif drawing.pending.mode == 'move' then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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drawing.pending.target_point.x = mx
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drawing.pending.target_point.y = my
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Drawing.relax_constraints(drawing, drawing.pending.target_point_index)
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end
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end
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elseif Current_drawing_mode == 'move' then
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if Drawing.in_drawing(drawing, x, y) then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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drawing.pending.target_point.x = mx
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drawing.pending.target_point.y = my
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Drawing.relax_constraints(drawing, drawing.pending.target_point_index)
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end
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else
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-- do nothing
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end
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end
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function Drawing.relax_constraints(drawing, p)
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for _,shape in ipairs(drawing.shapes) do
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if shape.mode == 'manhattan' then
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if shape.p1 == p then
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shape.mode = 'line'
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elseif shape.p2 == p then
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shape.mode = 'line'
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end
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elseif shape.mode == 'rectangle' or shape.mode == 'square' then
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for _,v in ipairs(shape.vertices) do
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if v == p then
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shape.mode = 'polygon'
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end
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end
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end
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end
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end
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function Drawing.mouse_released(x,y, button)
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if Current_drawing_mode == 'move' then
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Current_drawing_mode = Previous_drawing_mode
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Previous_drawing_mode = nil
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if Lines.current_drawing then
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Lines.current_drawing.pending = {}
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Lines.current_drawing = nil
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end
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elseif Lines.current_drawing then
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local drawing = Lines.current_drawing
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if drawing.pending then
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if drawing.pending.mode == 'freehand' then
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-- the last point added during update is good enough
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table.insert(drawing.shapes, drawing.pending)
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elseif drawing.pending.mode == 'line' then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then
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drawing.pending.p2 = Drawing.insert_point(drawing.points, mx,my)
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table.insert(drawing.shapes, drawing.pending)
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end
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elseif drawing.pending.mode == 'manhattan' then
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local p1 = drawing.points[drawing.pending.p1]
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then
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if math.abs(mx-p1.x) > math.abs(my-p1.y) then
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drawing.pending.p2 = Drawing.insert_point(drawing.points, mx, p1.y)
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else
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drawing.pending.p2 = Drawing.insert_point(drawing.points, p1.x, my)
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end
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local p2 = drawing.points[drawing.pending.p2]
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App.mouse_move(Margin_left+Drawing.pixels(p2.x), drawing.y+Drawing.pixels(p2.y))
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table.insert(drawing.shapes, drawing.pending)
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end
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elseif drawing.pending.mode == 'polygon' then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then
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table.insert(drawing.pending.vertices, Drawing.insert_point(drawing.points, mx,my))
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table.insert(drawing.shapes, drawing.pending)
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end
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elseif drawing.pending.mode == 'rectangle' then
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assert(#drawing.pending.vertices <= 2)
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if #drawing.pending.vertices == 2 then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then
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local first = drawing.points[drawing.pending.vertices[1]]
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local second = drawing.points[drawing.pending.vertices[2]]
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local thirdx,thirdy, fourthx,fourthy = Drawing.complete_rectangle(first.x,first.y, second.x,second.y, mx,my)
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table.insert(drawing.pending.vertices, Drawing.insert_point(drawing.points, thirdx,thirdy))
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table.insert(drawing.pending.vertices, Drawing.insert_point(drawing.points, fourthx,fourthy))
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table.insert(drawing.shapes, drawing.pending)
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end
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else
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-- too few points; draw nothing
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end
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elseif drawing.pending.mode == 'square' then
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assert(#drawing.pending.vertices <= 2)
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if #drawing.pending.vertices == 2 then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then
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local first = drawing.points[drawing.pending.vertices[1]]
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local second = drawing.points[drawing.pending.vertices[2]]
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local thirdx,thirdy, fourthx,fourthy = Drawing.complete_square(first.x,first.y, second.x,second.y, mx,my)
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table.insert(drawing.pending.vertices, Drawing.insert_point(drawing.points, thirdx,thirdy))
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table.insert(drawing.pending.vertices, Drawing.insert_point(drawing.points, fourthx,fourthy))
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table.insert(drawing.shapes, drawing.pending)
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end
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end
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elseif drawing.pending.mode == 'circle' then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then
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local center = drawing.points[drawing.pending.center]
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drawing.pending.radius = geom.dist(center.x,center.y, mx,my)
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table.insert(drawing.shapes, drawing.pending)
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end
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elseif drawing.pending.mode == 'arc' then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then
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local center = drawing.points[drawing.pending.center]
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drawing.pending.end_angle = geom.angle_with_hint(center.x,center.y, mx,my, drawing.pending.end_angle)
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table.insert(drawing.shapes, drawing.pending)
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end
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elseif drawing.pending.mode == 'name' then
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-- drop it
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else
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print(drawing.pending.mode)
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assert(false)
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end
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Lines.current_drawing.pending = {}
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Lines.current_drawing = nil
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end
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end
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end
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function Drawing.keychord_pressed(chord)
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if chord == 'C-p' and not App.mouse_down(1) then
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Current_drawing_mode = 'freehand'
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elseif App.mouse_down(1) and chord == 'l' then
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Current_drawing_mode = 'line'
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local _,drawing = Drawing.current_drawing()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.p1 = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
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elseif drawing.pending.mode == 'polygon' or drawing.pending.mode == 'rectangle' or drawing.pending.mode == 'square' then
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drawing.pending.p1 = drawing.pending.vertices[1]
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elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
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drawing.pending.p1 = drawing.pending.center
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end
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drawing.pending.mode = 'line'
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elseif chord == 'C-l' and not App.mouse_down(1) then
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Current_drawing_mode = 'line'
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elseif App.mouse_down(1) and chord == 'm' then
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Current_drawing_mode = 'manhattan'
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local drawing = Drawing.select_drawing_at_mouse()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.p1 = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
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elseif drawing.pending.mode == 'line' then
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-- do nothing
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elseif drawing.pending.mode == 'polygon' or drawing.pending.mode == 'rectangle' or drawing.pending.mode == 'square' then
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drawing.pending.p1 = drawing.pending.vertices[1]
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elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
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drawing.pending.p1 = drawing.pending.center
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end
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drawing.pending.mode = 'manhattan'
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elseif chord == 'C-m' and not App.mouse_down(1) then
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Current_drawing_mode = 'manhattan'
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elseif chord == 'C-g' and not App.mouse_down(1) then
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Current_drawing_mode = 'polygon'
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elseif App.mouse_down(1) and chord == 'g' then
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Current_drawing_mode = 'polygon'
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local _,drawing = Drawing.current_drawing()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.vertices = {Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)}
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elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then
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if drawing.pending.vertices == nil then
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drawing.pending.vertices = {drawing.pending.p1}
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end
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elseif drawing.pending.mode == 'rectangle' or drawing.pending.mode == 'square' then
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-- reuse existing vertices
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elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
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drawing.pending.vertices = {drawing.pending.center}
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end
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drawing.pending.mode = 'polygon'
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elseif chord == 'C-r' and not App.mouse_down(1) then
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Current_drawing_mode = 'rectangle'
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elseif App.mouse_down(1) and chord == 'r' then
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Current_drawing_mode = 'rectangle'
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local _,drawing = Drawing.current_drawing()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.vertices = {Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)}
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elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then
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if drawing.pending.vertices == nil then
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drawing.pending.vertices = {drawing.pending.p1}
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end
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elseif drawing.pending.mode == 'polygon' or drawing.pending.mode == 'square' then
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-- reuse existing (1-2) vertices
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elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
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drawing.pending.vertices = {drawing.pending.center}
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end
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drawing.pending.mode = 'rectangle'
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elseif chord == 'C-s' and not App.mouse_down(1) then
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Current_drawing_mode = 'square'
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elseif App.mouse_down(1) and chord == 's' then
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Current_drawing_mode = 'square'
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local _,drawing = Drawing.current_drawing()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.vertices = {Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)}
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elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then
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if drawing.pending.vertices == nil then
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drawing.pending.vertices = {drawing.pending.p1}
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end
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elseif drawing.pending.mode == 'polygon' then
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while #drawing.pending.vertices > 2 do
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table.remove(drawing.pending.vertices)
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end
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elseif drawing.pending.mode == 'rectangle' then
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-- reuse existing (1-2) vertices
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elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
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drawing.pending.vertices = {drawing.pending.center}
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end
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drawing.pending.mode = 'square'
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elseif App.mouse_down(1) and chord == 'p' and Current_drawing_mode == 'polygon' then
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local _,drawing = Drawing.current_drawing()
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local mx,my = Drawing.coord(App.mouse_x()-Margin_left), Drawing.coord(App.mouse_y()-drawing.y)
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local j = Drawing.insert_point(drawing.points, mx,my)
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table.insert(drawing.pending.vertices, j)
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elseif App.mouse_down(1) and chord == 'p' and (Current_drawing_mode == 'rectangle' or Current_drawing_mode == 'square') then
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local _,drawing = Drawing.current_drawing()
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local mx,my = Drawing.coord(App.mouse_x()-Margin_left), Drawing.coord(App.mouse_y()-drawing.y)
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local j = Drawing.insert_point(drawing.points, mx,my)
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while #drawing.pending.vertices >= 2 do
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table.remove(drawing.pending.vertices)
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end
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table.insert(drawing.pending.vertices, j)
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elseif chord == 'C-o' and not App.mouse_down(1) then
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Current_drawing_mode = 'circle'
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elseif App.mouse_down(1) and chord == 'a' and Current_drawing_mode == 'circle' then
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local _,drawing = Drawing.current_drawing()
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drawing.pending.mode = 'arc'
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local mx,my = Drawing.coord(App.mouse_x()-Margin_left), Drawing.coord(App.mouse_y()-drawing.y)
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local center = drawing.points[drawing.pending.center]
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drawing.pending.radius = geom.dist(center.x,center.y, mx,my)
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drawing.pending.start_angle = geom.angle(center.x,center.y, mx,my)
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elseif App.mouse_down(1) and chord == 'o' then
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Current_drawing_mode = 'circle'
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local _,drawing = Drawing.current_drawing()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.center = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
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elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then
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drawing.pending.center = drawing.pending.p1
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elseif drawing.pending.mode == 'polygon' or drawing.pending.mode == 'rectangle' or drawing.pending.mode == 'square' then
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drawing.pending.center = drawing.pending.vertices[1]
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end
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drawing.pending.mode = 'circle'
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elseif chord == 'C-u' and not App.mouse_down(1) then
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local drawing_index,drawing,i,p = Drawing.select_point_at_mouse()
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if drawing then
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if Previous_drawing_mode == nil then
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Previous_drawing_mode = Current_drawing_mode
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end
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Current_drawing_mode = 'move'
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drawing.pending = {mode=Current_drawing_mode, target_point=p, target_point_index=i}
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Lines.current_drawing_index = drawing_index
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Lines.current_drawing = drawing
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end
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elseif chord == 'C-n' and not App.mouse_down(1) then
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local drawing_index,drawing,point_index,p = Drawing.select_point_at_mouse()
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if drawing then
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if Previous_drawing_mode == nil then
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-- don't clobber
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Previous_drawing_mode = Current_drawing_mode
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end
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Current_drawing_mode = 'name'
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p.name = ''
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drawing.pending = {mode=Current_drawing_mode, target_point=point_index}
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Lines.current_drawing_index = drawing_index
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Lines.current_drawing = drawing
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end
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elseif chord == 'C-d' and not App.mouse_down(1) then
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local _,drawing,i,p = Drawing.select_point_at_mouse()
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if drawing then
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for _,shape in ipairs(drawing.shapes) do
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if Drawing.contains_point(shape, i) then
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if shape.mode == 'polygon' then
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local idx = table.find(shape.vertices, i)
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assert(idx)
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table.remove(shape.vertices, idx)
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if #shape.vertices < 3 then
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shape.mode = 'deleted'
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end
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else
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shape.mode = 'deleted'
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end
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end
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end
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drawing.points[i].deleted = true
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end
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local drawing,_,shape = Drawing.select_shape_at_mouse()
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if drawing then
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shape.mode = 'deleted'
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end
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elseif chord == 'C-h' and not App.mouse_down(1) then
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local drawing = Drawing.select_drawing_at_mouse()
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if drawing then
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drawing.show_help = true
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end
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end
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end
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function Drawing.complete_rectangle(firstx,firsty, secondx,secondy, x,y)
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if firstx == secondx then
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return x,secondy, x,firsty
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end
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if firsty == secondy then
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return secondx,y, firstx,y
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end
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local first_slope = (secondy-firsty)/(secondx-firstx)
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-- slope of second edge:
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-- -1/first_slope
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-- equation of line containing the second edge:
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-- y-secondy = -1/first_slope*(x-secondx)
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-- => 1/first_slope*x + y + (- secondy - secondx/first_slope) = 0
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-- now we want to find the point on this line that's closest to the mouse pointer.
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-- https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line#Line_defined_by_an_equation
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local a = 1/first_slope
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local c = -secondy - secondx/first_slope
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local thirdx = ((x-a*y) - a*c) / (a*a + 1)
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local thirdy = (a*(-x + a*y) - c) / (a*a + 1)
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-- slope of third edge = first_slope
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-- equation of line containing third edge:
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-- y - thirdy = first_slope*(x-thirdx)
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-- => -first_slope*x + y + (-thirdy + thirdx*first_slope) = 0
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-- now we want to find the point on this line that's closest to the first point
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local a = -first_slope
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local c = -thirdy + thirdx*first_slope
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local fourthx = ((firstx-a*firsty) - a*c) / (a*a + 1)
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local fourthy = (a*(-firstx + a*firsty) - c) / (a*a + 1)
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return thirdx,thirdy, fourthx,fourthy
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end
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function Drawing.complete_square(firstx,firsty, secondx,secondy, x,y)
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-- use x,y only to decide which side of the first edge to complete the square on
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local deltax = secondx-firstx
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local deltay = secondy-firsty
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local thirdx = secondx+deltay
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local thirdy = secondy-deltax
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if not geom.same_side(firstx,firsty, secondx,secondy, thirdx,thirdy, x,y) then
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deltax = -deltax
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deltay = -deltay
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thirdx = secondx+deltay
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thirdy = secondy-deltax
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end
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local fourthx = firstx+deltay
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local fourthy = firsty-deltax
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return thirdx,thirdy, fourthx,fourthy
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end
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function Drawing.current_drawing()
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local x, y = App.mouse_x(), App.mouse_y()
|
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for drawing_index,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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if Drawing.in_drawing(drawing, x,y) then
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return drawing_index,drawing
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end
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end
|
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end
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return nil
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end
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function Drawing.select_shape_at_mouse()
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for _,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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local x, y = App.mouse_x(), App.mouse_y()
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if Drawing.in_drawing(drawing, x,y) then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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for i,shape in ipairs(drawing.shapes) do
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assert(shape)
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if geom.on_shape(mx,my, drawing, shape) then
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return drawing,i,shape
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end
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end
|
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end
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end
|
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end
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end
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function Drawing.select_point_at_mouse()
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for drawing_index,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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local x, y = App.mouse_x(), App.mouse_y()
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if Drawing.in_drawing(drawing, x,y) then
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local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
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for i,point in ipairs(drawing.points) do
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assert(point)
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if Drawing.near(point, mx,my) then
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return drawing_index,drawing,i,point
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end
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end
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end
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end
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end
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end
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function Drawing.select_drawing_at_mouse()
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for _,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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local x, y = App.mouse_x(), App.mouse_y()
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if Drawing.in_drawing(drawing, x,y) then
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return drawing
|
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end
|
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end
|
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end
|
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end
|
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|
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function Drawing.contains_point(shape, p)
|
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if shape.mode == 'freehand' then
|
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-- not supported
|
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elseif shape.mode == 'line' or shape.mode == 'manhattan' then
|
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return shape.p1 == p or shape.p2 == p
|
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elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then
|
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return table.find(shape.vertices, p)
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elseif shape.mode == 'circle' then
|
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return shape.center == p
|
|
elseif shape.mode == 'arc' then
|
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return shape.center == p
|
|
-- ugh, how to support angles
|
|
elseif shape.mode == 'deleted' then
|
|
-- already done
|
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else
|
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print(shape.mode)
|
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assert(false)
|
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end
|
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end
|
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function Drawing.insert_point(points, x,y)
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for i,point in ipairs(points) do
|
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if Drawing.near(point, x,y) then
|
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return i
|
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end
|
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end
|
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table.insert(points, {x=x, y=y})
|
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return #points
|
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end
|
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|
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function Drawing.near(point, x,y)
|
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local px,py = Drawing.pixels(x),Drawing.pixels(y)
|
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local cx,cy = Drawing.pixels(point.x), Drawing.pixels(point.y)
|
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return (cx-px)*(cx-px) + (cy-py)*(cy-py) < Margin_left
|
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end
|
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|
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function Drawing.pixels(n) -- parts to pixels
|
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return math.floor(n*(Line_width-Margin_left)/256)
|
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end
|
|
function Drawing.coord(n) -- pixels to parts
|
|
return math.floor(n*256/(Line_width-Margin_left))
|
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end
|
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|
|
function table.find(h, x)
|
|
for k,v in pairs(h) do
|
|
if v == x then
|
|
return k
|
|
end
|
|
end
|
|
end
|
|
|
|
return Drawing
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