2015-01-08 18:39:20 +01:00
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<!DOCTYPE html>
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<!--
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2016-05-14 14:15:27 +02:00
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Copyright 2013 Hajime Hoshi
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2015-01-08 18:39:20 +01:00
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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2015-01-08 18:48:25 +01:00
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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2015-01-08 19:29:59 +01:00
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<title>Ebiten example - paint</title>
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2015-01-08 18:39:20 +01:00
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<style>
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body {
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font-family: sans-serif;
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}
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iframe {
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border-color: #999;
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border-style: solid;
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border-width: 1px;
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overflow: hidden;
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}
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pre {
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background: #eee;
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padding: 1em;
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}
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</style>
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<nav><a href="..">Ebiten</a></nav>
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2015-01-08 19:29:59 +01:00
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<h1>Ebiten example - paint</h1>
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2015-01-08 18:39:20 +01:00
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<iframe src="paint.content.html" width="640" height="480"></iframe>
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<pre><code>package main
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import (
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"fmt"
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"image"
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"image/color"
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"log"
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"math"
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2016-02-15 17:13:04 +01:00
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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2015-01-08 18:39:20 +01:00
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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count int
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brushImage *ebiten.Image
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canvasImage *ebiten.Image
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)
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2016-06-23 05:16:27 +02:00
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func paint(screen *ebiten.Image, x, y int) error {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(x), float64(y))
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op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
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theta := 2.0 * math.Pi * float64(count%60) / ebiten.FPS
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op.ColorM.RotateHue(theta)
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if err := canvasImage.DrawImage(brushImage, op); err != nil {
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return err
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}
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return nil
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}
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2016-06-23 05:16:27 +02:00
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func update(screen *ebiten.Image) error {
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drawn := false
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mx, my := ebiten.CursorPosition()
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if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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if err := paint(screen, mx, my); err != nil {
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return err
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}
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drawn = true
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}
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for _, t := range ebiten.Touches() {
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x, y := t.Position()
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if err := paint(screen, x, y); err != nil {
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return err
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}
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drawn = true
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}
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if drawn {
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count++
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2015-01-08 18:39:20 +01:00
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}
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if err := screen.DrawImage(canvasImage, nil); err != nil {
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return err
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}
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2016-06-23 05:16:27 +02:00
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msg := fmt.Sprintf("(%d, %d)", mx, my)
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for _, t := range ebiten.Touches() {
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x, y := t.Position()
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msg += fmt.Sprintf("\n(%d, %d) touch %d", x, y, t.ID())
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}
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if err := ebitenutil.DebugPrint(screen, msg); err != nil {
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2015-01-08 18:39:20 +01:00
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return err
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}
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return nil
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}
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func main() {
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var err error
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const a0, a1, a2 = 0x40, 0xc0, 0xff
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pixels := []uint8{
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a0, a1, a1, a0,
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a1, a2, a2, a1,
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a1, a2, a2, a1,
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a0, a1, a1, a0,
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}
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brushImage, err = ebiten.NewImageFromImage(&image.Alpha{
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Pix: pixels,
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Stride: 4,
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Rect: image.Rect(0, 0, 4, 4),
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}, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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canvasImage, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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canvasImage.Fill(color.White)
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Paint (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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</code></pre>
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2016-05-14 14:15:27 +02:00
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<footer>© 2013 Hajime Hoshi</footer>
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