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Task/Bitmap-Bresenhams-line-algorithm/Wart/bitmap-bresenhams-line-algorithm.wart

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+# doesn't handle vertical lines
+def (line x0 y0 x1 y1)
+  let steep ((> abs) y1-y0 x1-x0)
+    when steep
+      swap! x0 y0
+      swap! x1 y1
+    when (x0 > x1)
+      swap! x0 x1
+      swap! y0 y1
+    withs (deltax x1-x0
+           deltay (abs y1-y0)
+           error deltax/2
+           ystep (if (y0 < y1) 1 -1)
+           y y0)
+      for x x0 (x <= x1) ++x
+        if steep
+          plot y x
+          plot x y
+        error -= deltay
+        when (error < 0)
+          y += ystep
+          error += deltax