itowns
Version:
A JS/WebGL framework for 3D geospatial data visualization
142 lines (117 loc) • 6.29 kB
HTML
<html>
<head>
<title>Itowns - Custom ColorLayer effect</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">
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.6/dat.gui.min.js"></script>
</head>
<body>
<div id="viewerDiv"></div>
<div id="miniDiv"></div>
<script src="../dist/itowns.js"></script>
<script src="js/GUI/LoadingScreen.js"></script>
<script src="../dist/debug.js"></script>
<script src="js/GUI/GuiTools.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),
diffuse: new itowns.THREE.Color(0x444444),
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);
itowns.ShaderChunk.customHeaderColorLayer(`
const mat3 sobelKernelX = mat3(1.0, 2.0, 1.0,
0.0, 0.0, 0.0,
-1.0, -2.0, -1.0);
const mat3 sobelKernelY = mat3(1.0, 0.0, -1.0,
2.0, 0.0, -2.0,
1.0, 0.0, -1.0);
//performs a convolution on an image with the given kernel
float convolve(mat3 kernel, mat3 image) {
float result = 0.0;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
result += kernel[i][j]*image[i][j];
}
}
return result;
}
float edge(sampler2D textu, float stepx, float stepy, vec2 center){
// get samples around pixel
mat3 image = mat3(length(texture2D(textu,center + vec2(-stepx,stepy)).rgb),
length(texture2D(textu,center + vec2(0,stepy)).rgb),
length(texture2D(textu,center + vec2(stepx,stepy)).rgb),
length(texture2D(textu,center + vec2(-stepx,0)).rgb),
length(texture2D(textu,center).rgb),
length(texture2D(textu,center + vec2(stepx,0)).rgb),
length(texture2D(textu,center + vec2(-stepx,-stepy)).rgb),
length(texture2D(textu,center + vec2(0,-stepy)).rgb),
length(texture2D(textu,center + vec2(stepx,-stepy)).rgb));
vec2 result;
result.x = convolve(sobelKernelX, image);
result.y = convolve(sobelKernelY, image);
float color = clamp(length(result), 0.0, 255.0);
return color;
}
`);
itowns.ShaderChunk.customBodyColorLayer(`
ivec2 textureSize2d = textureSize(tex,0);
vec2 resolution = vec2(float(textureSize2d.x), float(textureSize2d.y));
float step = layer.effect_parameter;
vec2 cuv = pitUV(uv.xy, offsetScale);
float value = edge(tex, step/resolution.x, step/resolution.y, cuv);
color = vec4(vec3(value * 0.8, 0.0, 0.0), value);
`);
// Add a TMS imagery source
var opensmSource = new itowns.TMSSource({
crs: 'EPSG:3857',
isInverted: true,
format: 'image/png',
url: 'http://osm.oslandia.io/styles/klokantech-basic/${z}/${x}/${y}.png',
tileMatrixSet: 'PM'
});
// Add a TMS imagery layer
var opensmEffectLayer = new itowns.ColorLayer('OPENSM_Effect', {
source: opensmSource,
effect_type: itowns.colorLayerEffects.customEffect,
effect_parameter: 1.0,
magFilter: itowns.THREE.NearestFilter,
minFilter: itowns.THREE.NearestFilter,
});
var opensm = new itowns.ColorLayer('OPENSM', { source: opensmSource });
view.addLayer(opensm);
view.addLayer(opensmEffectLayer);
// Request redraw
view.notifyChange();
menuGlobe = new GuiTools('menuDiv', view);
menuGlobe.addImageryLayersGUI(view.getLayers(function gui(l) { return l.isColorLayer; }));
debug.createTileDebugUI(menuGlobe.gui, view);
menuGlobe.gui.add(opensmEffectLayer, 'effect_parameter', 0.0, 1.0).onChange((v) => {
opensmEffectLayer.effect_parameter = v;
view.notifyChange(opensmEffectLayer);
});
view.addEventListener(itowns.GLOBE_VIEW_EVENTS.GLOBE_INITIALIZED, () => {
itowns.ColorLayersOrdering.moveLayerToIndex(view, 'OPENSM', 0);
});
</script>
</body>
</html>