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<title>DeepZoomImage Doctests</title>
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<h1>
<a href="../../index.html">lib.</a><a href="../index.html">pixi.</a
><a href="index.html">deepzoom.</a>DeepZoomImage
</h1>
<p>
The main class of a deeply zoomable image that is represented by a hierarchy of tile layers for each zoom
level. This gives the user the impression that even huge pictures (up to gigapixel-images) can be zoomed
instantaneously, since the tiles at smaller levels are scaled immediately and overloaded by more detailed
tiles at the larger level as fast as possible.
</p>
<br />
<div id="app">
<button id="change_dpr">Change Pixel Ratio</button>
<div id="canvas_container"></div>
<div id="info"></div>
</div>
<script class="doctest">
// When an element is added, the ScatterApp wrapps it in it's own Scatter Container.
// Just as in the doctest: scatter.html
class ScatterApp extends PIXIApp {
sceneFactory() {
return new ScatterContainer(this.renderer, { showBounds: true, app: this })
}
}
let app
let state = 0
//Destroys the PIXIApp element and the corresponding canvas,
//to reinstantiate the entire application.
changePIXI()
function changePIXI() {
if (typeof app != 'undefined') {
//The parameter destroys the canvas, when destroying the app.
// Not deleting a new canvas resulted in some
// weird PIXI error.
app.destroy(true)
}
//A new canvas has to be created
//for the new view.
var canvas = document.createElement('canvas')
canvas_container.appendChild(canvas)
app = new ScatterApp({
resolution: state + 1,
//Default parameters
view: canvas,
autoResize: false,
width: 128,
height: 128,
backgroundColor: 0xffcccccc
})
.setup()
.run()
// To create a DeepZoomImage, a DeepZoomInfo has to
// be provided. It contains all the necessary informations
// for the DeepZoomImage, to behave as intended.
// (E.g. that it displays the right level of tiles for the current view distance.)
deepZoomInfo = new DeepZoomInfo({
tileSize: 128,
format: 'jpg',
overlap: 0,
type: 'map',
height: 4096,
width: 4096,
path: '../assets/maps/test',
urlTileTemplate: '{path}/{level}/{column}/{row}.{format}'
})
// Create the DeepZoomImage
deepZoomImage = new DeepZoomImage(deepZoomInfo, {
highResolution: !!state,
app
})
deepZoomImage.scatter = new DisplayObjectScatter(deepZoomImage, app.renderer, {
// Allow more flexible scaling for debugging purposes.
minScale: 0,
maxScale: 100,
// Notify the DeepZoomImage, when it's container has
// been transformed (translated, scaled, rotated, ...)
onTransform: (event) => {
deepZoomImage.transformed(event)
}
})
// Add the DeepZoomImage to the scene.
app.scene.addChild(deepZoomImage)
//Set info text.
info.innerHTML = 'resolution: ' + app.renderer.resolution + '<br>high resolution: ' + !!state
}
// Add functionality to the button.
change_dpr.addEventListener('click', (event) => {
state = (state + 1) % 2
changePIXI()
})
</script>
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