284 lines
9.9 KiB
Lua
284 lines
9.9 KiB
Lua
-- primitives for editing drawings
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Drawing = {}
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geom = require 'geom'
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function Drawing.draw(line, y)
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local pmx,pmy = love.mouse.getX(), love.mouse.getY()
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if pmx < 16+Drawing_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', 16,line.y, Drawing_width,Drawing.pixels(line.h))
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if icon[Current_drawing_mode] then
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icon[Current_drawing_mode](16+Drawing_width-20, line.y+4)
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else
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icon[Previous_drawing_mode](16+Drawing_width-20, line.y+4)
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end
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if love.mouse.isDown('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(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-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(16,line.y, line, shape)
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end
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for _,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)+16,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)+16,Drawing.pixels(p.y)+line.y, 2)
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end
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end
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end
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Drawing.draw_pending_shape(16,line.y, line)
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end
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function Drawing.current_drawing()
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local x, y = love.mouse.getX(), love.mouse.getY()
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for _,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width 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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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 = love.mouse.getX(), love.mouse.getY()
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if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-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 in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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local x, y = love.mouse.getX(), love.mouse.getY()
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if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-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,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 = love.mouse.getX(), love.mouse.getY()
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if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width 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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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' 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
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elseif shape.mode == 'arc' then
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return shape.center == p
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-- ugh, how to support angles
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elseif shape.mode == 'deleted' then
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-- 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.convert_line(drawing, shape)
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-- Perhaps we should do a more sophisticated "simple linear regression"
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-- here:
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-- https://en.wikipedia.org/wiki/Linear_regression#Simple_and_multiple_linear_regression
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-- But this works well enough for close-to-linear strokes.
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assert(shape.mode == 'freehand')
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shape.mode = 'line'
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shape.p1 = insert_point(drawing.points, shape.points[1].x, shape.points[1].y)
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local n = #shape.points
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shape.p2 = insert_point(drawing.points, shape.points[n].x, shape.points[n].y)
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end
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-- turn a line either horizontal or vertical
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function Drawing.convert_horvert(drawing, shape)
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if shape.mode == 'freehand' then
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convert_line(shape)
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end
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assert(shape.mode == 'line')
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local p1 = drawing.points[shape.p1]
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local p2 = drawing.points[shape.p2]
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if math.abs(p1.x-p2.x) > math.abs(p1.y-p2.y) then
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p2.y = p1.y
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else
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p2.x = p1.x
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end
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end
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function Drawing.smoothen(shape)
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assert(shape.mode == 'freehand')
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for _=1,7 do
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for i=2,#shape.points-1 do
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local a = shape.points[i-1]
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local b = shape.points[i]
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local c = shape.points[i+1]
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b.x = (a.x + b.x + c.x)/3
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b.y = (a.y + b.y + c.y)/3
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end
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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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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) < 16
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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' 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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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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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 == 'freehand' then
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draw_shape(left,top, drawing, shape)
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elseif shape.mode == 'line' then
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local p1 = drawing.points[shape.p1]
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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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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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 p1 = drawing.points[shape.p1]
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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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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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, love.mouse.getX(),love.mouse.getY())
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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(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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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, math.dist(cx,cy, love.mouse.getX(),love.mouse.getY()))
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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(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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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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end
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end
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function Drawing.pixels(n) -- parts to pixels
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return n*Drawing_width/256
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end
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function Drawing.coord(n) -- pixels to parts
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return math.floor(n*256/Drawing_width)
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end
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return Drawing
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