switch from freehand to just straight lines

Dependencies

• [2] T76KKDWZ turn strokes into horizontal and vertical lines
• [3] JVRL5TWL store device-independent coordinates inside drawings
• [4] EFMLTMZG bugfix: restrict strokes to the drawing they started in
• [5] OTIBCAUJ love2d scaffold
• [6] 6LJZN727 handle chords
• [7] IZZVOCLB confirm that we have access to all of the love API
• [8] MNWHXPBL more lightweight; select just the stroke at the mouse
• [9] KVHUFUFV reorg
• [10] WAZVXUV2 simplest possible way to straighten strokes
• [11] D2GCFTTT clean up repl functionality
• [12] XX7G2FFJ intermingle freehand line drawings with text
• [13] TRCAEE2A clip drawings inside the border
• [14] Z2CJVAPV lighter border for figures
• [15] G77XIN7M selecting a stroke
• [16] 4NDYV4WD fix 2 bugs in line selection
• [17] 3XD6M3CF refactor

Change contents

• replacement in main.lua at line 60
  [4.849]→[3.583:625](∅→∅)
  − if on_freehand(mx,my, shape) then
  [4.849]

  [4.45]
  + if on_line(mx,my, shape) then
• replacement in main.lua at line 65
  [4.150]→[4.849:931](∅→∅),[4.849]→[4.849:931](∅→∅),[4.931]→[3.626:741](∅→∅),[3.741]→[4.994:1043](∅→∅),[4.994]→[4.994:1043](∅→∅)
  − prev = nil

  − for _,point in ipairs(shape) do

  − if prev then

  − love.graphics.line(pixels(prev.x)+12,pixels(prev.y)+line.y, pixels(point.x)+12,pixels(point.y)+line.y)

  − end

  − prev = point

  − end
  [4.150]

  [4.1043]
  + love.graphics.line(pixels(shape.x1)+12,pixels(shape.y1)+line.y, pixels(shape.x2)+12,pixels(shape.y2)+line.y)
• replacement in main.lua at line 67
  [4.1053]→[4.1053:1136](∅→∅),[4.1136]→[3.742:855](∅→∅),[3.855]→[4.1197:1230](∅→∅),[4.1197]→[4.1197:1230](∅→∅)
  − prev = nil

  − for _,point in ipairs(line.pending) do

  − if prev then

  − love.graphics.line(pixels(prev.x)+12,pixels(prev.y)+line.y, pixels(point.x)+12,pixels(point.y)+line.y)

  − end

  − prev = point
  [4.1053]

  [4.1230]
  + if line.pending.x1 then

  + love.graphics.line(pixels(line.pending.x1)+12,pixels(line.pending.y1)+line.y, love.mouse.getX(),love.mouse.getY())
• edit in main.lua at line 90
  [3.957]→[3.957:1068](∅→∅)
  − table.insert(drawing.pending, {x=coord(love.mouse.getX()-12), y=coord(love.mouse.getY()-drawing.y)})
• edit in main.lua at line 99
  [4.142]

  [4.446]
  + end

  +

  + function love.mousereleased(x,y, button)

  + if lines.current then

  + if lines.current.pending then

  + lines.current.pending.x2 = coord(x-12)

  + lines.current.pending.y2 = coord(y-lines.current.y)

  + table.insert(lines.current.shapes, lines.current.pending)

  + lines.current.pending = {}

  + lines.current = nil

  + end

  + end
• edit in main.lua at line 118
  [3.1168]

  [4.408]
  + drawing.pending = {x1=coord(x-12), y1=coord(y-drawing.y)}
• edit in main.lua at line 160
  [4.469]→[4.1769:2010](∅→∅),[4.1128]→[4.1769:2010](∅→∅),[4.451]→[4.1769:2010](∅→∅)
  − function love.mousereleased(x,y, button)

  − if lines.current then

  − if lines.current.pending then

  − table.insert(lines.current.shapes, lines.current.pending)

  − lines.current.pending = {}

  − lines.current = nil

  − end

  − end

  − end

  −
• edit in main.lua at line 182
  [4.1135]→[4.3:32](∅→∅),[4.32]→[4.3:111](∅→∅),[4.111]→[2.3:11](∅→∅)
  − elseif chord == 'C-l' then

  − local drawing,i,shape = select_shape_at_mouse()

  − if drawing then

  − convert_line(drawing,i,shape)

  − end
• replacement in main.lua at line 197
  [4.433]→[3.1355:1399](∅→∅)
  − if on_freehand(mx,my, shape) then
  [4.433]

  [4.507]
  + if on_line(mx,my, shape) then
• edit in main.lua at line 204
  [4.607]→[4.493:826](∅→∅)
  − end

  −

  − function convert_line(drawing, i, shape)

  − -- Perhaps we should do a more sophisticated "simple linear regression"

  − -- here:

  − -- https://en.wikipedia.org/wiki/Linear_regression#Simple_and_multiple_linear_regression

  − -- But this works well enough for close-to-linear strokes.

  − drawing.shapes[i] = {shape[1], shape[#shape]}
• replacement in main.lua at line 208
  [2.260]→[2.260:445](∅→∅)
  − local x1,y1 = shape[1].x, shape[1].y

  − local x2,y2 = shape[#shape].x, shape[#shape].y

  − if math.abs(x1-x2) > math.abs(y1-y2) then

  − drawing.shapes[i] = {{x=x1, y=y1}, {x=x2, y=y1}}
  [2.260]

  [2.445]
  + if math.abs(shape.x1-shape.x2) > math.abs(shape.y1-shape.y2) then

  + shape.y2 = shape.y1
• replacement in main.lua at line 211
  [2.452]→[2.452:505](∅→∅)
  − drawing.shapes[i] = {{x=x1, y=y1}, {x=x1, y=y2}}
  [2.452]

  [2.505]
  + shape.x2 = shape.x1