2016-02-15 16:52:45 +01:00
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<!DOCTYPE html>
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<!--
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Copyright 2014 Hajime Hoshi
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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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<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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<title>Ebiten example - sprites</title>
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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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<h1>Ebiten example - sprites</h1>
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<iframe src="sprites.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/png"
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"log"
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"math/rand"
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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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2016-02-15 16:52:45 +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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ebitenImage *ebiten.Image
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ebitenImageWidth = 0
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ebitenImageHeight = 0
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)
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type Sprite struct {
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image *ebiten.Image
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x int
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y int
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vx int
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vy int
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}
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func (s *Sprite) Update() {
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s.x += s.vx
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s.y += s.vy
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if s.x < 0 {
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s.x = -s.x
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s.vx = -s.vx
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}
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if s.y < 0 {
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s.y = -s.y
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s.vy = -s.vy
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}
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w, h := s.image.Size()
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if screenWidth <= s.x+w {
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s.x = 2*(screenWidth-w) - s.x
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s.vx = -s.vx
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}
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if screenHeight <= s.y+h {
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s.y = 2*(screenHeight-h) - s.y
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s.vy = -s.vy
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}
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}
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type Sprites struct {
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sprites []*Sprite
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num int
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}
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func (s Sprites) Update() {
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for _, sprite := range s.sprites {
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sprite.Update()
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}
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}
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func (s Sprites) Len() int {
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return s.num
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}
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func (s Sprites) Dst(i int) (x0, y0, x1, y1 int) {
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if s.num <= i {
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return 0, 0, 0, 0
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}
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ss := s.sprites[i]
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return ss.x, ss.y, ss.x + ebitenImageWidth, ss.y + ebitenImageHeight
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}
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func (s Sprites) Src(i int) (x0, y0, x1, y1 int) {
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if s.num <= i {
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return 0, 0, 0, 0
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}
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return 0, 0, ebitenImageWidth, ebitenImageHeight
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}
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const (
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MinSprites = 0
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MaxSprites = 10000
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)
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var sprites = &Sprites{make([]*Sprite, MaxSprites), 500}
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func update(screen *ebiten.Image) error {
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if ebiten.IsKeyPressed(ebiten.KeyLeft) {
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sprites.num -= 20
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if sprites.num < MinSprites {
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sprites.num = MinSprites
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}
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}
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if ebiten.IsKeyPressed(ebiten.KeyRight) {
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sprites.num += 20
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if MaxSprites < sprites.num {
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sprites.num = MaxSprites
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}
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}
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sprites.Update()
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op := &ebiten.DrawImageOptions{
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ImageParts: sprites,
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}
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op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
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if err := screen.DrawImage(ebitenImage, op); err != nil {
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return err
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}
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msg := fmt.Sprintf(`FPS: %0.2f
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Num of sprites: %d
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Press <- or -> to change the number of sprites`, ebiten.CurrentFPS(), sprites.Len())
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ebitenutil.DebugPrint(screen, msg)
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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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2016-02-20 21:40:56 +01:00
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ebitenImage, _, err = ebitenutil.NewImageFromFile("_resources/images/ebiten.png", ebiten.FilterNearest)
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2016-02-15 16:52:45 +01:00
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if err != nil {
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log.Fatal(err)
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}
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ebitenImageWidth, ebitenImageHeight = ebitenImage.Size()
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for i, _ := range sprites.sprites {
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w, h := ebitenImage.Size()
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x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h)
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vx, vy := 2*rand.Intn(2)-1, 2*rand.Intn(2)-1
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sprites.sprites[i] = &Sprite{
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image: ebitenImage,
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x: x,
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y: y,
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vx: vx,
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vy: vy,
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}
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Sprites (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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<footer>© 2014 Hajime Hoshi</footer>
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