ebiten/examples/animation/main.go

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// Copyright 2018 The Ebiten Authors
//
// 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.
package main
import (
"bytes"
"image"
_ "image/png"
"log"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
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)
const (
screenWidth = 320
screenHeight = 240
frameOX = 0
frameOY = 32
frameWidth = 32
frameHeight = 32
frameCount = 8
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)
var (
runnerImage *ebiten.Image
)
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type Game struct {
count int
}
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func (g *Game) Update() error {
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g.count++
return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
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op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(-float64(frameWidth)/2, -float64(frameHeight)/2)
op.GeoM.Translate(screenWidth/2, screenHeight/2)
i := (g.count / 5) % frameCount
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sx, sy := frameOX+i*frameWidth, frameOY
screen.DrawImage(runnerImage.SubImage(image.Rect(sx, sy, sx+frameWidth, sy+frameHeight)).(*ebiten.Image), op)
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}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
func main() {
// Decode an image from the image file's byte slice.
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img, _, err := image.Decode(bytes.NewReader(images.Runner_png))
if err != nil {
log.Fatal(err)
}
runnerImage = ebiten.NewImageFromImage(img)
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ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
ebiten.SetWindowTitle("Animation (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
}
}