* | 2974 | Kartik K. Agaram | 2016-05-18 | 2 | -23/+24<401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
|
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'
-- 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=''}}
Cursor_line = 1
-- this is a line
-- ^cursor_pos = 1
-- ^cursor_pos = 2
-- ...
-- ^cursor_pos past end of line is 15
Cursor_pos = #Lines[Cursor_line].data+1
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
-- into 256 parts. `Drawing_width` describes their width in pixels.
Drawing_width = nil -- pixels
Zoom = 1.5
Filename = 'lines.txt'
function love.load(arg)
-- maximize window
love.window.setMode(0, 0) -- maximize
Screen_width, Screen_height, Screen_flags = love.window.getMode()
-- shrink slightly to account for window decoration
Screen_width = Screen_width-100
Screen_height = Screen_height-100
love.window.setMode(Screen_width, Screen_height)
love.window.setTitle('Text with Lines')
Drawing_width = math.floor(Screen_width/2/40)*40
love.keyboard.setTextInput(true) -- bring up keyboard on touch screen
love.keyboard.setKeyRepeat(true)
if #arg > 0 then
Filename = arg[1]
end
Lines = load_from_disk(Filename)
for i,line in ipairs(Lines) do
if line.mode == 'text' then
Cursor_line = i
end
end
love.window.setTitle('Text with Lines - '..Filename)
end
function love.filedropped(file)
Filename = file:getFilename()
file:open('r')
Lines = load_from_file(file)
file:close()
for i,line in ipairs(Lines) do
if line.mode == 'text' then
Cursor_line = i
end
end
love.window.setTitle('Text with Lines - '..Filename)
end
function love.draw()
button_handlers = {}
love.graphics.setColor(1, 1, 1)
love.graphics.rectangle('fill', 0, 0, Screen_width-1, Screen_height-1)
love.graphics.setColor(0, 0, 0)
local y = 0
for line_index,line in ipairs(Lines) do
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},
icon = icon.insert_drawing,
onpress1 = function()
table.insert(Lines, line_index, {mode='drawing', y=y, h=256/2, points={}, shapes={}, pending={}})
if Cursor_line >= line_index then
Cursor_line = Cursor_line+1
end
end})
if line_index == Cursor_line then
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
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
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
function love.mousepressed(x,y, button)
propagate_to_button_handlers(x,y, button)
for line_index,line in ipairs(Lines) do
if line.mode == 'text' then
-- move cursor
if x >= 16 and y >= line.y and y < line.y+15*Zoom then
Cursor_line = line_index
Cursor_pos = Text.nearest_cursor_pos(line.data, x, 1)
end
elseif line.mode == 'drawing' then
local drawing = line
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}
end
Lines.current = drawing
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)
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)
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
if Filename then
save_to_disk(Lines, Filename)
end
end
function love.textinput(t)
if love.mouse.isDown('1') then return end
if Lines[Cursor_line].mode == 'drawing' then return end
local byteoffset
if Cursor_pos > 1 then
byteoffset = utf8.offset(Lines[Cursor_line].data, Cursor_pos-1)
else
byteoffset = 0
end
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byteoffset)..t..string.sub(Lines[Cursor_line].data, byteoffset+1)
Cursor_pos = Cursor_pos+1
if Filename then
save_to_disk(Lines, Filename)
end
end
function keychord_pressed(chord)
-- Don't handle any keys here that would trigger love.textinput above.
-- shortcuts for text
if chord == 'return' then
table.insert(Lines, Cursor_line+1, {mode='text', data=''})
Cursor_line = Cursor_line+1
Cursor_pos = 1
elseif chord == 'left' then
if Cursor_pos > 1 then
Cursor_pos = Cursor_pos-1
end
elseif chord == 'right' then
if Cursor_pos <= #Lines[Cursor_line].data then
Cursor_pos = Cursor_pos+1
end
elseif chord == 'home' then
Cursor_pos = 1
elseif chord == 'end' then
Cursor_pos = #Lines[Cursor_line].data+1
-- transitioning between drawings and text
elseif chord == 'backspace' then
if Cursor_pos > 1 then
local byte_start = utf8.offset(Lines[Cursor_line].data, Cursor_pos-1)
local byte_end = utf8.offset(Lines[Cursor_line].data, Cursor_pos)
if byte_start then
if byte_end then
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)..string.sub(Lines[Cursor_line].data, byte_end)
else
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)
end
Cursor_pos = Cursor_pos-1
end
elseif Cursor_line > 1 then
if Lines[Cursor_line-1].mode == 'drawing' then
table.remove(Lines, Cursor_line-1)
else
-- join lines
Cursor_pos = utf8.len(Lines[Cursor_line-1].data)+1
Lines[Cursor_line-1].data = Lines[Cursor_line-1].data..Lines[Cursor_line].data
table.remove(Lines, Cursor_line)
end
Cursor_line = Cursor_line-1
end
elseif chord == 'delete' then
if Cursor_pos <= #Lines[Cursor_line].data then
local byte_start = utf8.offset(Lines[Cursor_line].data, Cursor_pos)
local byte_end = utf8.offset(Lines[Cursor_line].data, Cursor_pos+1)
if byte_start then
if byte_end then
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)..string.sub(Lines[Cursor_line].data, byte_end)
else
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)
end
-- no change to Cursor_pos
end
elseif Cursor_line < #Lines then
if Lines[Cursor_line+1].mode == 'drawing' then
table.remove(Lines, Cursor_line+1)
else
-- join lines
Lines[Cursor_line].data = Lines[Cursor_line].data..Lines[Cursor_line+1].data
table.remove(Lines, Cursor_line+1)
end
end
elseif chord == 'up' then
assert(Lines[Cursor_line].mode == 'text')
local new_cursor_line = Cursor_line
while new_cursor_line > 1 do
new_cursor_line = new_cursor_line-1
if Lines[new_cursor_line].mode == 'text' then
local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
Cursor_line = new_cursor_line
Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)
break
end
end
elseif chord == 'down' then
assert(Lines[Cursor_line].mode == 'text')
local new_cursor_line = Cursor_line
while new_cursor_line < #Lines do
new_cursor_line = new_cursor_line+1
if Lines[new_cursor_line].mode == 'text' then
local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
Cursor_line = new_cursor_line
Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)
break
end
end
elseif chord == 'C-=' then
Drawing_width = Drawing_width/Zoom
Zoom = Zoom+0.5
Drawing_width = Drawing_width*Zoom
elseif chord == 'C--' then
Drawing_width = Drawing_width/Zoom
Zoom = Zoom-0.5
Drawing_width = Drawing_width*Zoom
elseif chord == 'C-0' then
Drawing_width = Drawing_width/Zoom
Zoom = 1.5
Drawing_width = Drawing_width*Zoom
-- shortcuts for drawings
elseif chord == 'escape' and love.mouse.isDown('1') then
local drawing = Drawing.current_drawing()
drawing.pending = {}
elseif chord == 'C-f' and not love.mouse.isDown('1') then
Current_drawing_mode = 'freehand'
elseif chord == 'C-g' and not love.mouse.isDown('1') then
Current_drawing_mode = 'polygon'
elseif love.mouse.isDown('1') and chord == 'g' then
Current_drawing_mode = 'polygon'
local drawing = Drawing.current_drawing()
if drawing.pending.mode == 'freehand' then
drawing.pending.vertices = {Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)}
elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then
if drawing.pending.vertices == nil then
drawing.pending.vertices = {drawing.pending.p1}
end
elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
drawing.pending.vertices = {drawing.pending.center}
end
drawing.pending.mode = 'polygon'
elseif love.mouse.isDown('1') and chord == 'p' and Current_drawing_mode == 'polygon' then
local drawing = Drawing.current_drawing()
local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
local j = Drawing.insert_point(drawing.points, mx,my)
table.insert(drawing.pending.vertices, j)
elseif chord == 'C-c' and not love.mouse.isDown('1') then
Current_drawing_mode = 'circle'
elseif love.mouse.isDown('1') and chord == 'a' and Current_drawing_mode == 'circle' then
local drawing = Drawing.current_drawing()
drawing.pending.mode = 'arc'
local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
local j = Drawing.insert_point(drawing.points, mx,my)
local center = drawing.points[drawing.pending.center]
drawing.pending.radius = math.dist(center.x,center.y, mx,my)
drawing.pending.start_angle = geom.angle(center.x,center.y, mx,my)
elseif love.mouse.isDown('1') and chord == 'c' then
Current_drawing_mode = 'circle'
local drawing = Drawing.current_drawing()
if drawing.pending.mode == 'freehand' then
drawing.pending.center = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then
drawing.pending.center = drawing.pending.p1
elseif drawing.pending.mode == 'polygon' then
drawing.pending.center = drawing.pending.vertices[1]
end
drawing.pending.mode = 'circle'
elseif love.mouse.isDown('1') and chord == 'l' then
Current_drawing_mode = 'line'
local drawing = Drawing.current_drawing()
if drawing.pending.mode == 'freehand' then
drawing.pending.p1 = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
drawing.pending.p1 = drawing.pending.center
elseif drawing.pending.mode == 'polygon' then
drawing.pending.p1 = drawing.pending.vertices[1]
end
drawing.pending.mode = 'line'
elseif chord == 'C-l' then
Current_drawing_mode = 'line'
local drawing,_,shape = Drawing.select_shape_at_mouse()
if drawing then
convert_line(drawing, shape)
end
elseif love.mouse.isDown('1') and chord == 'm' then
Current_drawing_mode = 'manhattan'
local drawing = Drawing.select_drawing_at_mouse()
if drawing.pending.mode == 'freehand' then
drawing.pending.p1 = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
elseif drawing.pending.mode == 'line' then
-- do nothing
elseif drawing.pending.mode == 'polygon' then
drawing.pending.p1 = drawing.pending.vertices[1]
elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
drawing.pending.p1 = drawing.pending.center
end
drawing.pending.mode = 'manhattan'
elseif chord == 'C-m' and not love.mouse.isDown('1') then
Current_drawing_mode = 'manhattan'
local drawing,_,shape = Drawing.select_shape_at_mouse()
if drawing then
convert_horvert(drawing, shape)
end
elseif chord == 'C-s' and not love.mouse.isDown('1') then
local drawing,_,shape = Drawing.select_shape_at_mouse()
if drawing then
smoothen(shape)
end
elseif chord == 'C-v' and not love.mouse.isDown('1') then
local drawing,_,p = Drawing.select_point_at_mouse()
if drawing then
Previous_drawing_mode = Current_drawing_mode
Current_drawing_mode = 'move'
drawing.pending = {mode=Current_drawing_mode, target_point=p}
Lines.current = drawing
end
elseif love.mouse.isDown('1') and chord == 'v' then
local drawing,_,p = Drawing.select_point_at_mouse()
if drawing then
Previous_drawing_mode = Current_drawing_mode
Current_drawing_mode = 'move'
drawing.pending = {mode=Current_drawing_mode, target_point=p}
Lines.current = drawing
end
elseif chord == 'C-d' and not love.mouse.isDown('1') then
local drawing,i,p = Drawing.select_point_at_mouse()
if drawing then
for _,shape in ipairs(drawing.shapes) do
if Drawing.contains_point(shape, i) then
if shape.mode == 'polygon' then
local idx = table.find(shape.vertices, i)
assert(idx)
table.remove(shape.vertices, idx)
if #shape.vertices < 3 then
shape.mode = 'deleted'
end
else
shape.mode = 'deleted'
end
end
end
drawing.points[i].deleted = true
end
local drawing,_,shape = Drawing.select_shape_at_mouse()
if drawing then
shape.mode = 'deleted'
end
elseif chord == 'C-h' and not love.mouse.isDown('1') then
local drawing = Drawing.select_drawing_at_mouse()
if drawing then
drawing.show_help = true
end
elseif chord == 'escape' and not love.mouse.isDown('1') then
for _,line in ipairs(Lines) do
if line.mode == 'drawing' then
line.show_help = false
end
end
end
end
function love.keyreleased(key, scancode)
end
function table.find(h, x)
for k,v in pairs(h) do
if v == x then
return k
end
end
end
|