86 lines
2.1 KiB
JavaScript
86 lines
2.1 KiB
JavaScript
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import glmatrix from 'claygl/src/dep/glmatrix';
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var vec3 = glmatrix.vec3;
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function Globe(radius) {
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this.radius = radius;
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this.viewGL = null;
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this.altitudeAxis; // Displacement data provided by texture.
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this.displacementData = null;
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this.displacementWidth;
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this.displacementHeight;
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}
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Globe.prototype = {
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constructor: Globe,
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dimensions: ['lng', 'lat', 'alt'],
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type: 'globe',
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containPoint: function () {},
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setDisplacementData: function (data, width, height) {
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this.displacementData = data;
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this.displacementWidth = width;
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this.displacementHeight = height;
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},
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_getDisplacementScale: function (lng, lat) {
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var i = (lng + 180) / 360 * (this.displacementWidth - 1);
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var j = (90 - lat) / 180 * (this.displacementHeight - 1); // NEAREST SAMPLING
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// TODO Better bilinear sampling
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var idx = Math.round(i) + Math.round(j) * this.displacementWidth;
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return this.displacementData[idx];
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},
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dataToPoint: function (data, out) {
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var lng = data[0];
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var lat = data[1]; // Default have 0 altitude
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var altVal = data[2] || 0;
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var r = this.radius;
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if (this.displacementData) {
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r *= 1 + this._getDisplacementScale(lng, lat);
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}
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if (this.altitudeAxis) {
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r += this.altitudeAxis.dataToCoord(altVal);
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}
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lng = lng * Math.PI / 180;
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lat = lat * Math.PI / 180;
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var r0 = Math.cos(lat) * r;
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out = out || []; // PENDING
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out[0] = -r0 * Math.cos(lng + Math.PI);
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out[1] = Math.sin(lat) * r;
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out[2] = r0 * Math.sin(lng + Math.PI);
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return out;
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},
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pointToData: function (point, out) {
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var x = point[0];
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var y = point[1];
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var z = point[2];
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var len = vec3.len(point);
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x /= len;
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y /= len;
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z /= len;
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var theta = Math.asin(y);
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var phi = Math.atan2(z, -x);
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if (phi < 0) {
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phi = Math.PI * 2 + phi;
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}
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var lat = theta * 180 / Math.PI;
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var lng = phi * 180 / Math.PI - 180;
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out = out || [];
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out[0] = lng;
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out[1] = lat;
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out[2] = len - this.radius;
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if (this.altitudeAxis) {
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out[2] = this.altitudeAxis.coordToData(out[2]);
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}
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return out;
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}
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};
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export default Globe;
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