Initial data commit

Task/Bitmap-Bresenhams-line-algorithm/E/bitmap-bresenhams-line-algorithm-1.e

@@ -0,0 +1,30 @@
+def swap(&left, &right) { # From [[Generic swap]]
+  def t := left
+  left := right
+  right := t
+}
+
+def drawLine(image, var x0, var y0, var x1, var y1, color) {
+    def steep := (y1 - y0).abs() > (x1 - x0).abs()
+    if (steep) {
+        swap(&x0, &y0)
+        swap(&x1, &y1)
+    }
+    if (x0 > x1) {
+        swap(&x0, &x1)
+        swap(&y0, &y1)
+    }
+    def deltax := x1 - x0
+    def deltay := (y1 - y0).abs()
+    def ystep := if (y0 < y1) { 1 } else { -1 }
+    var error := deltax // 2
+    var y := y0
+    for x in x0..x1 {
+        if (steep) { image[y, x] := color } else { image[x, y] := color }
+        error -= deltay
+        if (error < 0) {
+            y += ystep
+            error += deltax
+        }
+    }
+}

Task/Bitmap-Bresenhams-line-algorithm/E/bitmap-bresenhams-line-algorithm-2.e

@@ -0,0 +1,3 @@
+def i := makeImage(5, 20)
+drawLine(i, 1, 1, 3, 18, makeColor.fromFloat(0,1,1))
+i.writePPM(<import:java.io.makeFileOutputStream>(<file:~/Desktop/Bresenham.ppm>))