akkartik/lines-polygon-experiment - Change KJQ5FEYVVQJTQ5YKHK77CQ7QWVUPW5LO3K7PK2CPJ447WD5UYUVAC

round coordinates to integers in a few places

Thanks Lion Kimbro for pointing out this issue.

I still have to use floats for start/end angles of arcs. That might be a sign that I don't have the right serialization yet for them. Or that that feature needs to go.

I started out with a hazy idea of only using 8-bit ints for coordinates, but now I'm not sure how committed I am to that constraint. While the width is always 256 units, it might be nice to create long portrait drawings at some point, whose height is greater than 256 units.

Created by Kartik K. Agaram on July 30, 2022

KJQ5FEYVVQJTQ5YKHK77CQ7QWVUPW5LO3K7PK2CPJ447WD5UYUVAC

Dependencies

In channels

main

Change contents

Replacement in drawing.lua at line 367 [4.98]

B:BD[3.3172] → [3.3172:3243]

          drawing.pending.radius = geom.dist(center.x,center.y, mx,my)

[3.3172]

[3.3243]

          drawing.pending.radius = round(geom.dist(center.x,center.y, mx,my))

Replacement in drawing.lua at line 583 [4.98]

B:BD[5.9531] → [5.9531:9624]

  local thirdx = ((x-a*y) - a*c) / (a*a + 1)
  local thirdy = (a*(-x + a*y) - c) / (a*a + 1)

[5.9531]

[5.9624]

  local thirdx = round(((x-a*y) - a*c) / (a*a + 1))
  local thirdy = round((a*(-x + a*y) - c) / (a*a + 1))

Replacement in drawing.lua at line 592 [4.98]

B:BD[5.9966] → [5.9966:10081]

  local fourthx = ((firstx-a*firsty) - a*c) / (a*a + 1)
  local fourthy = (a*(-firstx + a*firsty) - c) / (a*a + 1)

[5.9966]

[5.10081]

  local fourthx = round(((firstx-a*firsty) - a*c) / (a*a + 1))
  local fourthy = round((a*(-firstx + a*firsty) - c) / (a*a + 1))

Replacement in drawing.lua at line 702 [4.98]

B:BD[2.411] → [2.411:475]

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

[2.411]

[2.475]

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

Insertion in drawing.lua at line 708 [4.98]
[6.21510]
[6.22708]
```
function round(num)
  return math.floor(num+.5)
end
```