ebiten/docs/examples/paint.html
2016-08-28 03:50:06 +09:00

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<h2>Ebiten example - paint</h2>
<iframe src="paint.content.html" width="640" height="480"></iframe>
<pre><code class="language-go">// &#43;build example
package main
import (
&#34;fmt&#34;
&#34;image&#34;
&#34;image/color&#34;
&#34;log&#34;
&#34;math&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
count int
brushImage *ebiten.Image
canvasImage *ebiten.Image
)
func paint(screen *ebiten.Image, x, y int) error {
op := &amp;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) {
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&#43;&#43;
}
if err := screen.DrawImage(canvasImage, nil); err != nil {
return err
}
msg := fmt.Sprintf(&#34;(%d, %d)&#34;, mx, my)
for _, t := range ebiten.Touches() {
x, y := t.Position()
msg &#43;= fmt.Sprintf(&#34;\n(%d, %d) touch %d&#34;, x, y, t.ID())
}
if err := ebitenutil.DebugPrint(screen, msg); err != nil {
return err
}
return nil
}
func main() {
var err error
const a0, a1, a2 = 0x40, 0xc0, 0xff
pixels := []uint8{
a0, a1, a1, a0,
a1, a2, a2, a1,
a1, a2, a2, a1,
a0, a1, a1, a0,
}
brushImage, err = ebiten.NewImageFromImage(&amp;image.Alpha{
Pix: pixels,
Stride: 4,
Rect: image.Rect(0, 0, 4, 4),
}, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
canvasImage, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := canvasImage.Fill(color.White); err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Paint (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre>
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