go generate _docs

_docs/public/examples/paint.html

@@ -60,29 +60,48 @@ var (
     canvasImage *ebiten.Image
 )
 
-func update(screen *ebiten.Image) error {
-    if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
-        count++
+func paint(screen *ebiten.Image, x, y int) error {
+    op := &ebiten.DrawImageOptions{}
+    op.GeoM.Translate(float64(x), float64(y))
+    op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
+    theta := 2.0 * math.Pi * float64(count%60) / ebiten.FPS
+    op.ColorM.RotateHue(theta)
+    if err := canvasImage.DrawImage(brushImage, op); err != nil {
+        return err
     }
+    return nil
+}
 
+func update(screen *ebiten.Image) error {
+    drawn := false
     mx, my := ebiten.CursorPosition()
-
     if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
-        op := &ebiten.DrawImageOptions{}
-        op.GeoM.Translate(float64(mx), float64(my))
-        op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
-        theta := 2.0 * math.Pi * float64(count%60) / ebiten.FPS
-        op.ColorM.RotateHue(theta)
-        if err := canvasImage.DrawImage(brushImage, op); err != nil {
+        if err := paint(screen, mx, my); err != nil {
             return err
         }
+        drawn = true
+    }
+    for _, t := range ebiten.Touches() {
+        x, y := t.Position()
+        if err := paint(screen, x, y); err != nil {
+            return err
+        }
+        drawn = true
+    }
+    if drawn {
+        count++
     }
 
     if err := screen.DrawImage(canvasImage, nil); err != nil {
         return err
     }
 
-    if err := ebitenutil.DebugPrint(screen, fmt.Sprintf("(%d, %d)", mx, my)); err != nil {
+    msg := fmt.Sprintf("(%d, %d)", mx, my)
+    for _, t := range ebiten.Touches() {
+        x, y := t.Position()
+        msg += fmt.Sprintf("\n(%d, %d) touch %d", x, y, t.ID())
+    }
+    if err := ebitenutil.DebugPrint(screen, msg); err != nil {
         return err
     }
     return nil

_docs/public/index.html

@@ -102,6 +102,33 @@ pre {
 &lt;script src="yourgame.js"&gt;&lt;/script&gt;</code></pre>
 <p>NOTE: <code>file://</code> URL may not work with Ebiten. Execute your game on a HTTP server.</p>
 
+<h2>Getting Started</h2>
+
+<p>Let's build a simple "Hello world!" game to get started with Ebiten.
+First create a new directory (<code>mkdir hello_world</code>), and change
+into it (<code>cd hello_world</code>). Type the following code into
+the <code>main.go</code> file:</p>
+
+<pre><code>package main
+
+import (
+    "github.com/hajimehoshi/ebiten"
+    "github.com/hajimehoshi/ebiten/ebitenutil"
+)
+
+func update(screen *ebiten.Image) error {
+    ebitenutil.DebugPrint(screen, "Hello world!")
+    return nil
+}
+
+func main() {
+    ebiten.Run(update, 320, 240, 2, "Hello world!")
+}
+</code></pre>
+
+<p>Run the <code>go run</code> command to start the
+game. There you have it, your first Ebiten game!</p>
+
 <h2>Apps created with Ebiten</h2>
 <ul>
   <li><a href="https://github.com/peterhellberg/plasma">Plasma</a> by Peter Hellberg</li>