make freehand drawings smoother

Dependencies

• [2] SRVDX4I5 local var
• [3] WTDKUACN rectangle and square shapes
• [4] PTT4K4EU use the provided args everywhere
• [5] NYQ7HD4D move
• [6] XRLJDW3W casting about for more helpers to extract..
• [7] JFFUF5AL override mouse state lookups in tests
• [*] BLWAYPKV extract a module
• [*] 6DE7RBZ6 move mouse_released events to Drawing
• [*] VHQCNMAR several more modules

Change contents

• replacement in drawing.lua at line 119
  [3.1852]→[3.1860:1909](∅→∅),[3.1860]→[3.1860:1909](∅→∅)
  − Drawing.draw_shape(left,top, drawing, shape)
  [3.1852]

  [3.1909]
  + local shape_copy = deepcopy(shape)

  + Drawing.smoothen(shape_copy)

  + Drawing.draw_shape(left,top, drawing, shape_copy)
• edit in drawing.lua at line 296
  [10.399]

  [2.124]
  + Drawing.smoothen(drawing.pending)
• edit in drawing.lua at line 676
  [11.21499]

  [11.21499]
  + end

  + end

  +

  + function Drawing.smoothen(shape)

  + assert(shape.mode == 'freehand')

  + for _=1,7 do

  + for i=2,#shape.points-1 do

  + local a = shape.points[i-1]

  + local b = shape.points[i]

  + local c = shape.points[i+1]

  + b.x = (a.x + b.x + c.x)/3

  + b.y = (a.y + b.y + c.y)/3

  + end