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Task/Bitmap-Bresenhams-line-algorithm/Nim/bitmap-bresenhams-line-algorithm.nim

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+import math
+
+proc line(img: var Image, p, q: Point) =
+  let
+    dx = abs(q.x - p.x)
+    sx = if p.x < q.x: 1 else: -1
+    dy = abs(q.y - p.y)
+    sy = if p.y < q.y: 1 else: -1
+
+  var
+    p = p
+    q = q
+    err = (if dx > dy: dx else: -dy) div 2
+    e2 = 0
+
+  while true:
+    img[p] = Black
+    if p == q:
+      break
+    e2 = err
+    if e2 > -dx:
+      err -= dy
+      p.x += sx
+    if e2 < dy:
+      err += dx
+      p.y += sy