ebiten/_docs/public/examples/paint.html

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<!DOCTYPE html>
<!--
Copyright 2013 The Ebiten Authors
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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - paint</title>
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<style>
body {
font-family: sans-serif;
}
iframe {
border-color: #999;
border-style: solid;
border-width: 1px;
overflow: hidden;
}
pre {
background: #eee;
padding: 1em;
}
</style>
<nav><a href="..">Ebiten</a></nav>
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<h1>Ebiten example - paint</h1>
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<iframe src="paint.content.html" width="640" height="480"></iframe>
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<pre><code>// &#43;build example
package main
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import (
&#34;fmt&#34;
&#34;image&#34;
&#34;image/color&#34;
&#34;log&#34;
&#34;math&#34;
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&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
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)
const (
screenWidth = 320
screenHeight = 240
)
var (
count int
brushImage *ebiten.Image
canvasImage *ebiten.Image
)
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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
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}
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return nil
}
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func update(screen *ebiten.Image) error {
drawn := false
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mx, my := ebiten.CursorPosition()
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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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 {
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return err
}
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drawn = true
}
if drawn {
count&#43;&#43;
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}
if err := screen.DrawImage(canvasImage, nil); err != nil {
return err
}
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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 {
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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)
}
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if err := canvasImage.Fill(color.White); err != nil {
log.Fatal(err)
}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Paint (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre>
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<footer>© 2013 Hajime Hoshi</footer>