ebiten/docs/examples/perspective.html

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  <h2>Ebiten example - perspective</h2>
  <iframe src="perspective.content.html" width="640" height="480"></iframe>
  <pre><code class="language-go">// &#43;build example

package main

import (
        _ &#34;image/jpeg&#34;
        &#34;log&#34;

        &#34;github.com/hajimehoshi/ebiten&#34;
        &#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)

const (
        screenWidth  = 320
        screenHeight = 240
)

var (
        gophersImage *ebiten.Image
)

type parts struct {
        image *ebiten.Image
}

func (p parts) Len() int {
        _, h := p.image.Size()
        return h
}

func (p parts) Dst(i int) (x0, y0, x1, y1 int) {
        w, h := p.image.Size()
        width := w &#43; i*3/4
        x := ((h - i) * 3 / 4) / 2
        return x, i, x &#43; width, i &#43; 1
}

func (p parts) Src(i int) (x0, y0, x1, y1 int) {
        w, _ := p.image.Size()
        return 0, i, w, i &#43; 1
}

func update(screen *ebiten.Image) error {
        op := &amp;ebiten.DrawImageOptions{
                ImageParts: &amp;parts{gophersImage},
        }
        w, h := gophersImage.Size()
        maxWidth := float64(w) &#43; float64(h)*0.75
        op.GeoM.Translate(-maxWidth/2, -float64(h)/2)
        op.GeoM.Translate(screenWidth/2, screenHeight/2)
        if err := screen.DrawImage(gophersImage, op); err != nil {
                return err
        }
        return nil
}

func main() {
        var err error
        gophersImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/gophers.jpg&#34;, ebiten.FilterNearest)
        if err != nil {
                log.Fatal(err)
        }
        if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Perspective (Ebiten Demo)&#34;); err != nil {
                log.Fatal(err)
        }
}
</code></pre>

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Update docs to use GopherJS (#54) 2015-01-05 16:44:39 +01:00			`<!DOCTYPE html>`
doc: Force HTTPS 2016-08-27 17:58:27 +02:00			`<script src="../scripts/force-https.js"></script>`
Bug fix: Add favicon to example/*.html 2015-01-08 18:48:25 +01:00			`<link rel="shortcut icon" href="../favicon.png" type="image/png" >`
			`<link rel="icon" href="../favicon.png" type="image/png" >`
docs: Add <title> to examples 2015-01-08 19:29:59 +01:00			`<title>Ebiten example - perspective</title>`
doc: Use relative path 2016-08-27 17:48:15 +02:00			`<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">`
			`<link rel="stylesheet" href="../stylesheets/highlight-github.css">`
			`<link rel="stylesheet" href="../stylesheets/ebiten.css">`
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00
			`<header class="navbar"><div class="container">`
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doc: Use relative path 2016-08-27 17:48:15 +02:00			`<a class="navbar-brand" href="..">Ebiten</a>`
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`</div>`
doc: Fix thumbnail size 2016-08-26 19:37:08 +02:00			`<nav class="collapse navbar-collapse">`
			`<ul class="nav navbar-nav navbar-right">`
			`<li><a href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>`
doc: Force HTTPS 2016-08-27 17:58:27 +02:00			`<li><a href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>`
doc: Fix thumbnail size 2016-08-26 19:37:08 +02:00			`<li><a href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>`
			`</ul>`
			`</nav>`
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`</header>`
Update docs 2015-01-08 15:45:30 +01:00
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`<main><div class="container">`

doc: Adjust fonts 2016-08-26 20:18:16 +02:00			`<h2>Ebiten example - perspective</h2>`
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`<iframe src="perspective.content.html" width="640" height="480"></iframe>`
doc: Highlight code 2016-08-27 07:00:06 +02:00			`<pre><code class="language-go">// +build example`
doc: go generate; Add style.css 2016-08-26 16:33:36 +02:00
			`package main`
Update docs 2015-01-08 15:45:30 +01:00
			`import (`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`_ "image/jpeg"`
			`"log"`
Swap import order 2016-02-15 17:13:04 +01:00
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`"github.com/hajimehoshi/ebiten"`
			`"github.com/hajimehoshi/ebiten/ebitenutil"`
Update docs 2015-01-08 15:45:30 +01:00			`)`

			`const (`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`screenWidth = 320`
			`screenHeight = 240`
Update docs 2015-01-08 15:45:30 +01:00			`)`

			`var (`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`gophersImage *ebiten.Image`
Update docs 2015-01-08 15:45:30 +01:00			`)`

			`type parts struct {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`image *ebiten.Image`
Update docs 2015-01-08 15:45:30 +01:00			`}`

			`func (p parts) Len() int {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`_, h := p.image.Size()`
			`return h`
Update docs 2015-01-08 15:45:30 +01:00			`}`

			`func (p parts) Dst(i int) (x0, y0, x1, y1 int) {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`w, h := p.image.Size()`
			`width := w + i*3/4`
			`x := ((h - i) * 3 / 4) / 2`
			`return x, i, x + width, i + 1`
Update docs 2015-01-08 15:45:30 +01:00			`}`

			`func (p parts) Src(i int) (x0, y0, x1, y1 int) {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`w, _ := p.image.Size()`
			`return 0, i, w, i + 1`
Update docs 2015-01-08 15:45:30 +01:00			`}`

			`func update(screen *ebiten.Image) error {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`op := &ebiten.DrawImageOptions{`
			`ImageParts: &parts{gophersImage},`
			`}`
			`w, h := gophersImage.Size()`
			`maxWidth := float64(w) + float64(h)*0.75`
			`op.GeoM.Translate(-maxWidth/2, -float64(h)/2)`
			`op.GeoM.Translate(screenWidth/2, screenHeight/2)`
			`if err := screen.DrawImage(gophersImage, op); err != nil {`
			`return err`
			`}`
			`return nil`
Update docs 2015-01-08 15:45:30 +01:00			`}`

			`func main() {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`var err error`
			`gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)`
			`if err != nil {`
			`log.Fatal(err)`
			`}`
			`if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Perspective (Ebiten Demo)"); err != nil {`
			`log.Fatal(err)`
			`}`
Update docs 2015-01-08 15:45:30 +01:00			`}`
			`</code></pre>`

doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`</div></main>`

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			`<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">Apache License 2.0</a>.</p>`
			`<p>The content of this page is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">the Creative Commons Attribution 4.0 License</a>.</p>`
			`</div></footer>`
Update docs 2015-01-08 15:45:30 +01:00
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