mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
141 lines
4.7 KiB
HTML
141 lines
4.7 KiB
HTML
<!DOCTYPE html>
|
|
<meta charset="utf-8">
|
|
<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/paint.png">
|
|
<meta name="description" content="Ebiten example - paint">
|
|
<link rel="shortcut icon" href="../favicon.png" type="image/png" >
|
|
<link rel="icon" href="../favicon.png" type="image/png" >
|
|
<title>Ebiten example - paint</title>
|
|
|
|
<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
|
|
<link rel="stylesheet" href="../stylesheets/highlight-github.css">
|
|
<link rel="stylesheet" href="../stylesheets/ebiten.css">
|
|
<script src="../scripts/googleanalytics.js"></script>
|
|
|
|
<nav class="navbar"><div class="container">
|
|
<nav class="d-flex flex-row" style="width: 100%;">
|
|
<div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>
|
|
<ul class="nav">
|
|
<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
|
|
<li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
|
|
<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
|
|
<li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a>
|
|
</ul>
|
|
</nav>
|
|
</div></nav>
|
|
|
|
<main><div class="container">
|
|
|
|
<h2>Ebiten example - paint</h2>
|
|
<iframe src="paint.content.html" width="640" height="480"></iframe>
|
|
<div class="card"><pre class="card-body"><code class="language-go">// +build example
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"image"
|
|
"image/color"
|
|
"log"
|
|
"math"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/ebitenutil"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
count int
|
|
brushImage *ebiten.Image
|
|
canvasImage *ebiten.Image
|
|
)
|
|
|
|
func init() {
|
|
const (
|
|
a0 = 0x40
|
|
a1 = 0xc0
|
|
a2 = 0xff
|
|
)
|
|
pixels := []uint8{
|
|
a0, a1, a1, a0,
|
|
a1, a2, a2, a1,
|
|
a1, a2, a2, a1,
|
|
a0, a1, a1, a0,
|
|
}
|
|
brushImage, _ = ebiten.NewImageFromImage(&image.Alpha{
|
|
Pix: pixels,
|
|
Stride: 4,
|
|
Rect: image.Rect(0, 0, 4, 4),
|
|
}, ebiten.FilterNearest)
|
|
|
|
canvasImage, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
|
|
canvasImage.Fill(color.White)
|
|
}
|
|
|
|
// paint draws the brush on the given canvas image at the position (x, y).
|
|
func paint(canvas *ebiten.Image, x, y int) {
|
|
op := &ebiten.DrawImageOptions{}
|
|
op.GeoM.Translate(float64(x), float64(y))
|
|
// Scale the color and rotate the hue so that colors vary on each frame.
|
|
op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
|
|
theta := 2.0 * math.Pi * float64(count%ebiten.FPS) / ebiten.FPS
|
|
op.ColorM.RotateHue(theta)
|
|
canvas.DrawImage(brushImage, op)
|
|
}
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
drawn := false
|
|
|
|
// Paint the brush by mouse dragging
|
|
mx, my := ebiten.CursorPosition()
|
|
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
|
|
paint(canvasImage, mx, my)
|
|
drawn = true
|
|
}
|
|
|
|
// Paint the brush by touches
|
|
for _, t := range ebiten.Touches() {
|
|
x, y := t.Position()
|
|
paint(canvasImage, x, y)
|
|
drawn = true
|
|
}
|
|
if drawn {
|
|
count++
|
|
}
|
|
|
|
if ebiten.IsRunningSlowly() {
|
|
return nil
|
|
}
|
|
|
|
screen.DrawImage(canvasImage, 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())
|
|
}
|
|
ebitenutil.DebugPrint(screen, msg)
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Paint (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|
|
</code></pre></div>
|
|
|
|
</div></main>
|
|
|
|
<footer><div class="container">
|
|
<p>© 2013 Hajime Hoshi</p>
|
|
<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p>
|
|
<p>The content of this page is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">the Creative Commons Attribution 4.0 License</a>.</p>
|
|
</div></footer>
|
|
|
|
<script src="../scripts/highlight.pack.js"></script>
|
|
<script>hljs.initHighlightingOnLoad();</script>
|