view.love/main.lua

258 lines
10 KiB
Lua
Raw Normal View History

local utf8 = require 'utf8'
require 'keychord'
require 'file'
require 'button'
local Text = require 'text'
local Drawing = require 'drawing'
local geom = require 'geom'
require 'help'
require 'icons'
-- a line is either text or a drawing
-- a text is a table with:
-- mode = 'text'
-- string data
-- a drawing is a table with:
-- mode = 'drawing'
-- a (y) coord in pixels (updated while painting screen),
-- a (h)eight,
-- an array of points, and
-- an array of shapes
-- a shape is a table containing:
-- a mode
-- an array points for mode 'freehand' (raw x,y coords; freehand drawings don't pollute the points array of a drawing)
-- an array vertices for mode 'polygon', 'rectangle', 'square'
-- p1, p2 for mode 'line'
-- p1, p2, arrow-mode for mode 'arrow-line'
2022-05-16 05:04:20 +00:00
-- center, radius for mode 'circle'
-- center, radius, start_angle, end_angle for mode 'arc'
-- Unless otherwise specified, coord fields are normalized; a drawing is always 256 units wide
-- The field names are carefully chosen so that switching modes in midstream
-- remembers previously entered points where that makes sense.
--
-- Open question: how to maintain Sketchpad-style constraints? Answer for now:
-- we don't. Constraints operate only for the duration of a drawing operation.
-- We'll continue to persist them just to keep the option open to continue
-- solving for them. But for now, this is a program to create static drawings
-- once, and read them passively thereafter.
Lines = {{mode='text', data=''}}
2022-05-18 02:33:35 +00:00
Cursor_line = 1
-- this is a line
-- ^cursor_pos = 1
-- ^cursor_pos = 2
-- ...
-- ^cursor_pos past end of line is 15
2022-05-18 05:05:00 +00:00
Cursor_pos = #Lines[Cursor_line].data+1 -- in Unicode codepoints
2022-05-18 02:33:35 +00:00
Screen_width, Screen_height, Screen_flags = 0, 0, nil
Current_drawing_mode = 'line'
Previous_drawing_mode = nil
-- All drawings span 100% of some conceptual 'page width' and divide it up
2022-05-18 02:33:35 +00:00
-- into 256 parts. `Drawing_width` describes their width in pixels.
Drawing_width = nil -- pixels
2022-05-18 02:33:35 +00:00
Zoom = 1.5
2022-05-17 06:01:01 +00:00
2022-05-18 02:33:35 +00:00
Filename = 'lines.txt'
2022-05-15 21:00:49 +00:00
function love.load(arg)
2022-05-16 16:39:44 +00:00
-- maximize window
2022-05-02 04:55:57 +00:00
love.window.setMode(0, 0) -- maximize
2022-05-18 02:33:35 +00:00
Screen_width, Screen_height, Screen_flags = love.window.getMode()
2022-05-16 16:39:44 +00:00
-- shrink slightly to account for window decoration
2022-05-18 02:33:35 +00:00
Screen_width = Screen_width-100
Screen_height = Screen_height-100
love.window.setMode(Screen_width, Screen_height)
love.window.setTitle('Text with Lines')
2022-05-18 02:33:35 +00:00
Drawing_width = math.floor(Screen_width/2/40)*40
love.keyboard.setTextInput(true) -- bring up keyboard on touch screen
2022-05-18 04:37:39 +00:00
love.keyboard.setKeyRepeat(true)
if #arg > 0 then
2022-05-18 02:33:35 +00:00
Filename = arg[1]
end
2022-05-18 02:33:35 +00:00
Lines = load_from_disk(Filename)
for i,line in ipairs(Lines) do
if line.mode == 'text' then
2022-05-18 02:33:35 +00:00
Cursor_line = i
end
end
2022-05-18 02:33:35 +00:00
love.window.setTitle('Text with Lines - '..Filename)
2022-05-02 04:55:57 +00:00
end
function love.filedropped(file)
2022-05-18 02:33:35 +00:00
Filename = file:getFilename()
file:open('r')
Lines = load_from_file(file)
2022-05-17 01:44:17 +00:00
file:close()
for i,line in ipairs(Lines) do
if line.mode == 'text' then
2022-05-18 02:33:35 +00:00
Cursor_line = i
end
end
2022-05-18 02:33:35 +00:00
love.window.setTitle('Text with Lines - '..Filename)
end
2022-05-02 04:55:57 +00:00
function love.draw()
button_handlers = {}
2022-05-02 04:55:57 +00:00
love.graphics.setColor(1, 1, 1)
2022-05-18 02:33:35 +00:00
love.graphics.rectangle('fill', 0, 0, Screen_width-1, Screen_height-1)
2022-05-02 04:55:57 +00:00
love.graphics.setColor(0, 0, 0)
local y = 0
2022-05-18 02:48:12 +00:00
for line_index,line in ipairs(Lines) do
2022-05-18 02:33:35 +00:00
y = y+15*Zoom
line.y = y
if line.mode == 'text' and line.data == '' then
button('draw', {x=4,y=y+4, w=12,h=12, color={1,1,0},
2022-05-17 19:58:12 +00:00
icon = icon.insert_drawing,
onpress1 = function()
2022-05-18 02:48:12 +00:00
table.insert(Lines, line_index, {mode='drawing', y=y, h=256/2, points={}, shapes={}, pending={}})
if Cursor_line >= line_index then
2022-05-18 02:33:35 +00:00
Cursor_line = Cursor_line+1
end
end})
2022-05-18 02:48:12 +00:00
if line_index == Cursor_line then
2022-05-17 04:35:19 +00:00
love.graphics.setColor(0,0,0)
love.graphics.print('_', 25, y+6) -- drop the cursor down a bit to account for the increased font size
end
elseif line.mode == 'drawing' then
y = y+Drawing.pixels(line.h)
Drawing.draw(line, y)
else
Text.draw(line, line_index, Cursor_line, y, Cursor_pos)
end
2022-05-02 04:55:57 +00:00
end
end
function love.update(dt)
if love.mouse.isDown('1') then
if Lines.current then
if Lines.current.mode == 'drawing' then
local drawing = Lines.current
2022-05-11 20:00:15 +00:00
local x, y = love.mouse.getX(), love.mouse.getY()
if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
if drawing.pending.mode == 'freehand' then
table.insert(drawing.pending.points, {x=Drawing.coord(love.mouse.getX()-16), y=Drawing.coord(love.mouse.getY()-drawing.y)})
elseif drawing.pending.mode == 'move' then
local mx,my = Drawing.coord(x-16), Drawing.coord(y-drawing.y)
drawing.pending.target_point.x = mx
drawing.pending.target_point.y = my
end
end
end
end
elseif Current_drawing_mode == 'move' then
local drawing = Lines.current
local x, y = love.mouse.getX(), love.mouse.getY()
if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
local mx,my = Drawing.coord(x-16), Drawing.coord(y-drawing.y)
drawing.pending.target_point.x = mx
drawing.pending.target_point.y = my
end
end
end
2022-05-12 04:55:06 +00:00
function love.mousepressed(x,y, button)
2022-05-12 15:27:41 +00:00
propagate_to_button_handlers(x,y, button)
2022-05-17 05:28:34 +00:00
2022-05-18 02:48:12 +00:00
for line_index,line in ipairs(Lines) do
if line.mode == 'text' then
-- move cursor
2022-05-18 03:51:39 +00:00
if x >= 16 and y >= line.y and y < line.y+15*Zoom then
2022-05-18 02:48:12 +00:00
Cursor_line = line_index
Cursor_pos = Text.nearest_cursor_pos(line.data, x, 1)
end
elseif line.mode == 'drawing' then
local drawing = line
2022-05-17 05:28:34 +00:00
local x, y = love.mouse.getX(), love.mouse.getY()
if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
if Current_drawing_mode == 'freehand' then
drawing.pending = {mode=Current_drawing_mode, points={{x=Drawing.coord(x-16), y=Drawing.coord(y-drawing.y)}}}
elseif Current_drawing_mode == 'line' or Current_drawing_mode == 'manhattan' then
local j = Drawing.insert_point(drawing.points, Drawing.coord(x-16), Drawing.coord(y-drawing.y))
drawing.pending = {mode=Current_drawing_mode, p1=j}
elseif Current_drawing_mode == 'polygon' then
local j = Drawing.insert_point(drawing.points, Drawing.coord(x-16), Drawing.coord(y-drawing.y))
drawing.pending = {mode=Current_drawing_mode, vertices={j}}
elseif Current_drawing_mode == 'circle' then
local j = Drawing.insert_point(drawing.points, Drawing.coord(x-16), Drawing.coord(y-drawing.y))
drawing.pending = {mode=Current_drawing_mode, center=j}
2022-05-17 05:28:34 +00:00
end
Lines.current = drawing
2022-05-17 05:28:34 +00:00
end
end
end
end
function love.mousereleased(x,y, button)
if Current_drawing_mode == 'move' then
Current_drawing_mode = Previous_drawing_mode
Previous_drawing_mode = nil
elseif Lines.current then
if Lines.current.pending then
if Lines.current.pending.mode == 'freehand' then
-- the last point added during update is good enough
table.insert(Lines.current.shapes, Lines.current.pending)
elseif Lines.current.pending.mode == 'line' then
local mx,my = Drawing.coord(x-16), Drawing.coord(y-Lines.current.y)
if mx >= 0 and mx < 256 and my >= 0 and my < Lines.current.h then
local j = Drawing.insert_point(Lines.current.points, mx,my)
Lines.current.pending.p2 = j
table.insert(Lines.current.shapes, Lines.current.pending)
end
elseif Lines.current.pending.mode == 'manhattan' then
local p1 = Lines.current.points[Lines.current.pending.p1]
local mx,my = Drawing.coord(x-16), Drawing.coord(y-Lines.current.y)
if mx >= 0 and mx < 256 and my >= 0 and my < Lines.current.h then
if math.abs(mx-p1.x) > math.abs(my-p1.y) then
local j = Drawing.insert_point(Lines.current.points, mx, p1.y)
Lines.current.pending.p2 = j
else
local j = Drawing.insert_point(Lines.current.points, p1.x, my)
Lines.current.pending.p2 = j
end
local p2 = Lines.current.points[Lines.current.pending.p2]
love.mouse.setPosition(16+Drawing.pixels(p2.x), Lines.current.y+Drawing.pixels(p2.y))
table.insert(Lines.current.shapes, Lines.current.pending)
2022-05-14 23:52:42 +00:00
end
elseif Lines.current.pending.mode == 'polygon' then
local mx,my = Drawing.coord(x-16), Drawing.coord(y-Lines.current.y)
if mx >= 0 and mx < 256 and my >= 0 and my < Lines.current.h then
local j = Drawing.insert_point(Lines.current.points, mx,my)
table.insert(Lines.current.shapes, Lines.current.pending)
end
table.insert(Lines.current.shapes, Lines.current.pending)
elseif Lines.current.pending.mode == 'circle' then
local mx,my = Drawing.coord(x-16), Drawing.coord(y-Lines.current.y)
if mx >= 0 and mx < 256 and my >= 0 and my < Lines.current.h then
local center = Lines.current.points[Lines.current.pending.center]
Lines.current.pending.radius = math.dist(center.x,center.y, mx,my)
table.insert(Lines.current.shapes, Lines.current.pending)
2022-05-15 04:14:07 +00:00
end
elseif Lines.current.pending.mode == 'arc' then
local mx,my = Drawing.coord(x-16), Drawing.coord(y-Lines.current.y)
if mx >= 0 and mx < 256 and my >= 0 and my < Lines.current.h then
local center = Lines.current.points[Lines.current.pending.center]
Lines.current.pending.end_angle = geom.angle_with_hint(center.x,center.y, mx,my, Lines.current.pending.end_angle)
table.insert(Lines.current.shapes, Lines.current.pending)
end
end
Lines.current.pending = {}
Lines.current = nil
end
end
2022-05-18 05:24:41 +00:00
save_to_disk(Lines, Filename)
end
function keychord_pressed(chord)
if love.mouse.isDown('1') or chord:sub(1,2) == 'C-' then
Drawing.keychord_pressed(chord)
else
Text.keychord_pressed(chord)
2022-05-12 05:29:21 +00:00
end
end
function love.keyreleased(key, scancode)
end