Data update

Task/Bitmap-Bresenhams-line-algorithm/Crystal/bitmap-bresenhams-line-algorithm-1.cr

@@ -0,0 +1,17 @@
+require "./pixmap"
+
+class Pixmap
+  def line (x0, y0, x1, y1, color)
+    dx, sx = (x1-x0).abs, x0<x1 ? 1 : -1
+    dy, sy = (y1-y0).abs, y0<y1 ? 1 : -1
+    err = (dx>dy ? dx : -dy) // 2
+
+    loop do
+      self[x0, y0] = color
+      break if x0 == x1 && y0 == y1
+      e2 = err
+      (err -= dy; x0 += sx) if e2 >-dx
+      (err += dx; y0 += sy) if e2 < dy
+    end
+  end
+end

Task/Bitmap-Bresenhams-line-algorithm/Crystal/bitmap-bresenhams-line-algorithm-2.cr

@@ -0,0 +1,7 @@
+require "./bresenham"
+
+img = Pixmap.new 10, 5, Color::WHITE
+
+img.line 0, 3, 9, 0, Color::RED
+
+img.write STDOUT