mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
76 lines
1.7 KiB
Go
76 lines
1.7 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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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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_ "image/jpeg"
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"log"
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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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gophersImage *ebiten.Image
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)
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type parts struct {
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image *ebiten.Image
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}
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func (p parts) Len() int {
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_, h := p.image.Size()
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return h
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}
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func (p parts) Dst(i int) (x0, y0, x1, y1 int) {
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w, h := p.image.Size()
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width := w + i*3/4
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x := ((h - i) * 3 / 4) / 2
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return x, i, x + width, i + 1
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}
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func (p parts) Src(i int) (x0, y0, x1, y1 int) {
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w, _ := p.image.Size()
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return 0, i, w, i + 1
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}
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func update(screen *ebiten.Image) error {
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op := &ebiten.DrawImageOptions{
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ImageParts: &parts{gophersImage},
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}
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w, h := gophersImage.Size()
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maxWidth := float64(w) + float64(h)*0.75
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op.GeoM.Translate(-maxWidth/2, -float64(h)/2)
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op.GeoM.Translate(screenWidth/2, screenHeight/2)
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screen.DrawImage(gophersImage, op)
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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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gophersImage, _, err = ebitenutil.NewImageFromFile("images/gophers.jpg", 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, 1, "Perspective (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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