mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package main
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import (
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"image/color"
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_ "image/png"
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"log"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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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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ebitenImage *ebiten.Image
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)
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type imageParts struct {
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diff float64
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}
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func (p *imageParts) Src(i int) (int, int, int, int) {
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w, h := ebitenImage.Size()
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return 0, 0, w, h
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}
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func (p *imageParts) Dst(i int) (int, int, int, int) {
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x := int(float64(i%10)*p.diff + 15)
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y := int(float64(i/10)*p.diff + 20)
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w, h := ebitenImage.Size()
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return x, y, x + w, y + h
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}
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func (p *imageParts) Len() int {
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return 10 * 10
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}
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func update(screen *ebiten.Image) error {
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count++
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count %= ebiten.FPS * 10
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diff := float64(count) * 0.2
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switch {
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case 480 < count:
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diff = 0
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case 240 < count:
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diff = float64(480-count) * 0.2
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}
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if err := screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff}); err != nil {
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return err
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}
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op := &ebiten.DrawImageOptions{}
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op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
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op.ImageParts = &imageParts{
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diff: diff,
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}
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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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return nil
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}
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func main() {
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var err error
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ebitenImage, _, err = ebitenutil.NewImageFromFile("_resources/images/ebiten.png", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Alpha Blending (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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