Initial data commit

Task/Bitmap-Bresenhams-line-algorithm/Go/bitmap-bresenhams-line-algorithm-1.go

@@ -0,0 +1,46 @@
+package raster
+
+// Line draws line by Bresenham's algorithm.
+func (b *Bitmap) Line(x0, y0, x1, y1 int, p Pixel) {
+    // implemented straight from WP pseudocode
+    dx := x1 - x0
+    if dx < 0 {
+        dx = -dx
+    }
+    dy := y1 - y0
+    if dy < 0 {
+        dy = -dy
+    }
+    var sx, sy int
+    if x0 < x1 {
+        sx = 1
+    } else {
+        sx = -1
+    }
+    if y0 < y1 {
+        sy = 1
+    } else {
+        sy = -1
+    }
+    err := dx - dy
+
+    for {
+        b.SetPx(x0, y0, p)
+        if x0 == x1 && y0 == y1 {
+            break
+        }
+        e2 := 2 * err
+        if e2 > -dy {
+            err -= dy
+            x0 += sx
+        }
+        if e2 < dx {
+            err += dx
+            y0 += sy
+        }
+    }
+}
+
+func (b *Bitmap) LineRgb(x0, y0, x1, y1 int, c Rgb) {
+    b.Line(x0, y0, x1, y1, c.Pixel())
+}

Task/Bitmap-Bresenhams-line-algorithm/Go/bitmap-bresenhams-line-algorithm-2.go

@@ -0,0 +1,23 @@
+package main
+
+// Files required to build supporting package raster are found in:
+// * This task (immediately above)
+// * Bitmap
+// * Write a PPM file
+
+import (
+    "raster"
+    "fmt"
+)
+
+func main() {
+    b := raster.NewBitmap(400, 300)
+    b.FillRgb(0xdfefff)
+    blue := raster.Rgb(0x8fcfff)
+    b.LineRgb(7, 12, 307, 122, blue)
+    b.LineRgb(177, 12, 127, 222, blue)
+    err := b.WritePpmFile("bresenham.ppm")
+    if err != nil {
+        fmt.Println(err)
+    }
+}