itowns
Version:
A JS/WebGL framework for 3D geospatial data visualization
94 lines (81 loc) • 3.81 kB
HTML
<html>
<head>
<title>Itowns - Orthographic Camera Example</title>
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="css/example.css">
<link rel="stylesheet" type="text/css" href="css/LoadingScreen.css">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div id="viewerDiv"></div>
<span id="divScaleWidget"> Scale </span>
<script src="../dist/itowns.js"></script>
<script src="js/GUI/LoadingScreen.js"></script>
<script src="js/Scale.js"></script>
<script type="text/javascript">
// # Orthographic viewer
// Define geographic extent: CRS, min/max X, min/max Y
var extent = new itowns.Extent(
'EPSG:3857',
-20026376.39, 20026376.39,
-20048966.10, 20048966.10);
// `viewerDiv` will contain iTowns' rendering area (`<canvas>`)
var viewerDiv = document.getElementById('viewerDiv');
// Instanciate PlanarView
// By default itowns' tiles geometry have a "skirt" (ie they have a height),
// but in case of orthographic we don't need this feature, so disable it
var view = new itowns.PlanarView(viewerDiv, extent, { disableSkirt: true, maxSubdivisionLevel: 10,
camera: { type: itowns.CAMERA_TYPE.ORTHOGRAPHIC },
placement: new itowns.Extent('EPSG:3857', -20000000, 20000000, -8000000, 20000000),
controls: {
// Faster zoom in/out speed
zoomFactor: 3,
// prevent from zooming in too much
maxResolution: 0.005 // a pixel shall not represent a metric size smaller than 5 mm
},
});
setupLoadingScreen(viewerDiv, view);
// Add a TMS imagery source
var opensmSource = new itowns.TMSSource({
isInverted: true,
// eslint-disable-next-line no-template-curly-in-string
url: 'http://c.tile.stamen.com/watercolor/${z}/${x}/${y}.jpg',
networkOptions: { crossOrigin: 'anonymous' },
extent,
crs: 'EPSG:3857',
attribution: {
name: 'OpenStreetMap',
url: 'http://www.openstreetmap.org/',
},
});
// Add a TMS imagery layer
var opensmLayer = new itowns.ColorLayer('OPENSM', {
updateStrategy: {
type: itowns.STRATEGY_DICHOTOMY,
},
source: opensmSource,
});
view.addLayer(opensmLayer);
// Initialize scale :
const initialScaleSize = 200; // in pixel
const divScaleWidget = document.getElementById('divScaleWidget');
function updateScaleWidget() {
let computedScale = roundPixelsFromMeters(view, initialScaleSize);
let format = getMetersUnit(computedScale.meters);
divScaleWidget.innerHTML = `${format.distance} ${format.unit}`;
divScaleWidget.style.width = `${computedScale.pixels}`;
}
// Updates scale when needed :
view.addEventListener(itowns.VIEW_EVENTS.INITIALIZED, function () {
// eslint-disable-next-line no-console
console.info('View initialized');
updateScaleWidget();
});
view.addEventListener(itowns.PLANAR_CONTROL_EVENT.MOVED, function () {
updateScaleWidget();
})
// Request redraw
view.notifyChange();
</script>
</body>
</html>