selecting a stroke

Dependencies

• [2] Z2CJVAPV lighter border for figures
• [3] EFMLTMZG bugfix: restrict strokes to the drawing they started in
• [4] QU7NHFOV show cursor
• [5] IZZVOCLB confirm that we have access to all of the love API
• [6] XX7G2FFJ intermingle freehand line drawings with text
• [7] OTIBCAUJ love2d scaffold
• [8] TRCAEE2A clip drawings inside the border

Change contents

• edit in main.lua at line 7
  [4.14]

  [4.14]
  + mode = ''
• edit in main.lua at line 47
  [4.805]→[2.48:84](∅→∅)
  − love.graphics.setColor(0,0,0)
• edit in main.lua at line 48
  [4.849]

  [4.849]
  + if shape.selected then

  + love.graphics.setColor(1,0,0)

  + else

  + love.graphics.setColor(0,0,0)

  + end
• replacement in main.lua at line 82
  [4.446]→[4.1358:1391](∅→∅)
  − if love.mouse.isDown('1') then
  [4.446]

  [3.3]
  + if love.mouse.isDown('1') and mode == 'draw' then
• edit in main.lua at line 101
  [3.187]

  [3.187]
  + mode = 'grab'
• edit in main.lua at line 107
  [3.440]

  [3.440]
  + for _,shape in ipairs(drawing.shapes) do

  + if on_freehand(x,y, shape) then

  + shape.selected = true

  + return

  + end

  + end
• edit in main.lua at line 116
  [3.464]

  [3.464]
  + mode = 'draw'
• edit in main.lua at line 119
  [3.469]

  [4.1769]
  + function on_freehand(x,y, shape)

  + local prev

  + for _,p in ipairs(shape) do

  + if prev then

  + if on_line(x,y, {x1=prev.x,y1=prev.y, x2=p.x,y2=p.y}) then

  + return true

  + end

  + end

  + prev = p

  + end

  + return false

  + end

  +

  + function on_line(x,y, shape)

  + if shape.x1 == shape.x2 then

  + local y1,y2 = shape.y1,shape.y2

  + if y1 > y2 then

  + y1,y2 = y2,y2

  + end

  + return y >= y1 and y <= y2

  + end

  + -- has the right slope and intercept

  + local m = (shape.y2 - shape.y1) / (shape.x2 - shape.x1)

  + local yp = shape.y1 + m*(x-shape.x1)

  + if yp < 0.95*y or yp > 1.05*y then

  + return false

  + end

  + -- between endpoints

  + local k = (x-shape.x1) / (shape.x2-shape.x1)

  + return k > -0.05 and k < 1.05

  + end

  +