2015-01-05 16:44:39 +01:00
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<!DOCTYPE html>
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<!--
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Copyright 2015 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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2015-01-08 15:45:30 +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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<h1>perspective</h1>
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<iframe src="perspective.content.html" width="640" height="480"></iframe>
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<pre><code>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, 2, "Perspective (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>© 2015 Hajime Hoshi</footer>
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