akkartik/lines-polygon-experiment - Change WTDKUACNTWB4KD34TZZNPILNX4FQ6MR64XYBAA5GOMICF73WLIAAC

rectangle and square shapes

Created by Kartik K. Agaram on May 18, 2022

WTDKUACNTWB4KD34TZZNPILNX4FQ6MR64XYBAA5GOMICF73WLIAAC

Dependencies

In channels

main

Change contents

Insertion in icons.lua at line 41 [4.5323]

[4.6505]

end
function icon.rectangle(x, y)
  love.graphics.line(x+4,y+8, x+4,y+16)
  love.graphics.line(x+4,y+16, x+16,y+16)
  love.graphics.line(x+16,y+16, x+16,y+8)
  love.graphics.line(x+16,y+8, x+4,y+8)

Insertion in icons.lua at line 50 [4.5323]

[4.6510]

function icon.square(x, y)
  love.graphics.line(x+6,y+6, x+6,y+16)
  love.graphics.line(x+6,y+16, x+16,y+16)
  love.graphics.line(x+16,y+16, x+16,y+6)
  love.graphics.line(x+16,y+6, x+6,y+6)
end

Insertion in help.lua at line 33 [4.6622]

[4.8097]

    y = y+15*Zoom
  end
  if Current_drawing_mode ~= 'rectangle' then
    love.graphics.print("* Press 'ctrl+r' to switch to drawing rectangles", 16+30,y, 0, Zoom)
    y = y+15*Zoom
  end
  if Current_drawing_mode ~= 'square' then
    love.graphics.print("* Press 'ctrl+s' to switch to drawing squares", 16+30,y, 0, Zoom)

Insertion in help.lua at line 99 [4.6622]

[4.10735]

    y = y+15*Zoom
  end
  if Current_drawing_mode ~= 'rectangle' then
    love.graphics.print("* Press 'g' to switch to drawing rectangles", 16+30,y, 0, Zoom)
    y = y+15*Zoom
  end
  if Current_drawing_mode ~= 'square' then
    love.graphics.print("* Press 'g' to switch to drawing squares", 16+30,y, 0, Zoom)

Replacement in geom.lua at line 10 [4.11579]

B:BD[4.11923] → [4.11923:11961]

  elseif shape.mode == 'polygon' then

[4.11923]

[4.11961]

  elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then

Insertion in geom.lua at line 83 [4.11579]

[4.13814]

end
-- are (x3,y3) and (x4,y4) on the same side of the line between (x1,y1) and (x2,y2)
function geom.same_side(x1,y1, x2,y2, x3,y3, x4,y4)
  if x1 == x2 then
    return math.sign(x3-x1) == math.sign(x4-x1)
  end
  if y1 == y2 then
    return math.sign(y3-y1) == math.sign(y4-y1)
  end
  local m = (y2-y1)/(x2-x1)
  return math.sign(m*(x3-x1) + y1-y3) == math.sign(m*(x4-x1) + y1-y4)
end
function math.sign(x)
  if x > 0 then
    return 1
  elseif x == 0 then
    return 0
  elseif x < 0 then
    return -1
  end

Replacement in drawing.lua at line 66 [5.98]

B:BD[3.636] → [3.636:674]

  elseif shape.mode == 'polygon' then

[3.636]

[3.674]

  elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then

Insertion in drawing.lua at line 85 [5.98]
[3.1680]
[3.1680]
```
    -- ignore
```

Replacement in drawing.lua at line 94 [5.98]

B:BD[3.1825] → [3.1825:1860]

  if shape.mode == 'freehand' then

[3.1825]

[3.1860]

  if shape.mode == nil then
    -- nothing pending
  elseif shape.mode == 'freehand' then

Insertion in drawing.lua at line 127 [5.98]

[3.3372]

  elseif shape.mode == 'rectangle' then
    local pmx,pmy = love.mouse.getX(), love.mouse.getY()
    local first = drawing.points[shape.vertices[1]]
    if #shape.vertices == 1 then
      love.graphics.line(Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top, pmx,pmy)
      return
    end
    local second = drawing.points[shape.vertices[2]]
    local mx,my = Drawing.coord(pmx-left), Drawing.coord(pmy-top)
    local thirdx,thirdy, fourthx,fourthy = Drawing.complete_rectangle(first.x,first.y, second.x,second.y, mx,my)
    love.graphics.line(Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top, Drawing.pixels(second.x)+left,Drawing.pixels(second.y)+top)
    love.graphics.line(Drawing.pixels(second.x)+left,Drawing.pixels(second.y)+top, Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top)
    love.graphics.line(Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top, Drawing.pixels(fourthx)+left,Drawing.pixels(fourthy)+top)
    love.graphics.line(Drawing.pixels(fourthx)+left,Drawing.pixels(fourthy)+top, Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top)
  elseif shape.mode == 'square' then
    local pmx,pmy = love.mouse.getX(), love.mouse.getY()
    local first = drawing.points[shape.vertices[1]]
    if #shape.vertices == 1 then
      love.graphics.line(Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top, pmx,pmy)
      return
    end
    local second = drawing.points[shape.vertices[2]]
    local mx,my = Drawing.coord(pmx-left), Drawing.coord(pmy-top)
    local thirdx,thirdy, fourthx,fourthy = Drawing.complete_square(first.x,first.y, second.x,second.y, mx,my)
    love.graphics.line(Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top, Drawing.pixels(second.x)+left,Drawing.pixels(second.y)+top)
    love.graphics.line(Drawing.pixels(second.x)+left,Drawing.pixels(second.y)+top, Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top)
    love.graphics.line(Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top, Drawing.pixels(fourthx)+left,Drawing.pixels(fourthy)+top)
    love.graphics.line(Drawing.pixels(fourthx)+left,Drawing.pixels(fourthy)+top, Drawing.pixels(first.x)+left,Drawing.pixels(first.y)+top)

Insertion in drawing.lua at line 172 [5.98]
[3.4352]
[3.4352]
```
  else
    print(shape.mode)
    assert(false)
```

Replacement in drawing.lua at line 189 [5.98]

B:BD[6.1252] → [6.1252:1300]

  elseif Current_drawing_mode == 'polygon' then

[6.1252]

[6.1300]

  elseif Current_drawing_mode == 'polygon' or Current_drawing_mode == 'rectangle' or Current_drawing_mode == 'square' then

Insertion in drawing.lua at line 195 [5.98]

[6.1671]

  else
    print(Current_drawing_mode)
    assert(false)

Insertion in drawing.lua at line 224 [5.98]

[2.1041]

  else
    print(Current_drawing_mode)
    assert(false)

Replacement in drawing.lua at line 264 [5.98]

B:BD[7.1904] → [7.1904:1974]

          local j = Drawing.insert_point(Lines.current.points, mx,my)

[7.1904]

[7.1974]

          table.insert(Lines.current.pending.vertices, Drawing.insert_point(Lines.current.points, mx,my))

Replacement in drawing.lua at line 267 [5.98]

B:BD[7.2054] → [7.2054:2120]

        table.insert(Lines.current.shapes, Lines.current.pending)

[7.2054]

[7.2120]

      elseif Lines.current.pending.mode == 'rectangle' then
        assert(#Lines.current.pending.vertices <= 2)
        if #Lines.current.pending.vertices == 2 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 first = Lines.current.points[Lines.current.pending.vertices[1]]
            local second = Lines.current.points[Lines.current.pending.vertices[2]]
            local thirdx,thirdy, fourthx,fourthy = Drawing.complete_rectangle(first.x,first.y, second.x,second.y, mx,my)
            table.insert(Lines.current.pending.vertices, Drawing.insert_point(Lines.current.points, thirdx,thirdy))
            table.insert(Lines.current.pending.vertices, Drawing.insert_point(Lines.current.points, fourthx,fourthy))
            table.insert(Lines.current.shapes, Lines.current.pending)
          end
        else
          -- too few points; draw nothing
        end
      elseif Lines.current.pending.mode == 'square' then
        assert(#Lines.current.pending.vertices <= 2)
        if #Lines.current.pending.vertices == 2 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 first = Lines.current.points[Lines.current.pending.vertices[1]]
            local second = Lines.current.points[Lines.current.pending.vertices[2]]
            local thirdx,thirdy, fourthx,fourthy = Drawing.complete_square(first.x,first.y, second.x,second.y, mx,my)
            table.insert(Lines.current.pending.vertices, Drawing.insert_point(Lines.current.points, thirdx,thirdy))
            table.insert(Lines.current.pending.vertices, Drawing.insert_point(Lines.current.points, fourthx,fourthy))
            table.insert(Lines.current.shapes, Lines.current.pending)
          end
        end

Insertion in drawing.lua at line 309 [5.98]

[7.3044]

      else
        print(Lines.current.pending.mode)
        assert(false)

Replacement in drawing.lua at line 350 [5.98]

B:BD[8.6652] → [8.6652:6744]

  elseif love.mouse.isDown('1') and chord == 'p' and Current_drawing_mode == 'polygon' then

[8.6652]

[8.6744]

  elseif chord == 'C-r' and not love.mouse.isDown('1') then
    Current_drawing_mode = 'rectangle'
  elseif love.mouse.isDown('1') and chord == 'r' then
    Current_drawing_mode = 'rectangle'
    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 = 'rectangle'
  elseif chord == 'C-s' and not love.mouse.isDown('1') then
    Current_drawing_mode = 'square'
  elseif love.mouse.isDown('1') and chord == 's' then
    Current_drawing_mode = 'square'
    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 = 'square'
  elseif love.mouse.isDown('1') and chord == 'p' and (Current_drawing_mode == 'polygon' or Current_drawing_mode == 'rectangle' or Current_drawing_mode == 'square') then

Insertion in drawing.lua at line 497 [5.98]

[8.11786]

  end
end
function Drawing.complete_rectangle(firstx,firsty, secondx,secondy, x,y)
  if firstx == secondx then
    local thirdx = y
    local thirdy = secondy
    love.graphics.line(Drawing.pixels(secondx)+left,Drawing.pixels(secondy)+top, Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top)
    love.graphics.line(Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top, Drawing.pixels(thirdx)+left,Drawing.pixels(firsty)+top)
    return thirdx,thirdy, thirdx,firsty
  end
  if firsty == secondy then
    local thirdx = secondx
    local thirdy = y
    love.graphics.line(Drawing.pixels(secondx)+left,Drawing.pixels(secondy)+top, Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top)
    love.graphics.line(Drawing.pixels(thirdx)+left,Drawing.pixels(thirdy)+top, Drawing.pixels(firstx)+left,Drawing.pixels(thirdy)+top)
    return
  end
  local first_slope = (secondy-firsty)/(secondx-firstx)
  -- slope of second edge:
  --    -1/first_slope
  -- equation of line containing the second edge:
  --    y-secondy = -1/first_slope*(x-secondx)
  -- => 1/first_slope*x + y + (- secondy - secondx/first_slope) = 0
  -- now we want to find the point on this line that's closest to the mouse pointer.
  -- https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line#Line_defined_by_an_equation
  local a = 1/first_slope
  local c = -secondy - secondx/first_slope
  local thirdx = ((x-a*y) - a*c) / (a*a + 1)
  local thirdy = (a*(-x + a*y) - c) / (a*a + 1)
  -- slope of third edge = first_slope
  -- equation of line containing third edge:
  --     y - thirdy = first_slope*(x-thirdx)
  --  => -first_slope*x + y + (-thirdy + thirdx*first_slope) = 0
  -- now we want to find the point on this line that's closest to the first point
  local a = -first_slope
  local c = -thirdy + thirdx*first_slope
  local fourthx = ((firstx-a*firsty) - a*c) / (a*a + 1)
  local fourthy = (a*(-firstx + a*firsty) - c) / (a*a + 1)
  return thirdx,thirdy, fourthx,fourthy
end
function Drawing.complete_square(firstx,firsty, secondx,secondy, x,y)
  -- use x,y only to decide which side of the first edge to complete the square on
  local deltax = secondx-firstx
  local deltay = secondy-firsty
  local thirdx = secondx+deltay
  local thirdy = secondy-deltax
  if not geom.same_side(firstx,firsty, secondx,secondy, thirdx,thirdy, x,y) then
    deltax = -deltax
    deltay = -deltay
    thirdx = secondx+deltay
    thirdy = secondy-deltax

Insertion in drawing.lua at line 551 [5.98]

[8.11792]

  local fourthx = firstx+deltay
  local fourthy = firsty-deltax
  return thirdx,thirdy, fourthx,fourthy