65 lines
1.9 KiB
JavaScript
65 lines
1.9 KiB
JavaScript
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/**
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* Lines geometry
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* Use screen space projected lines lineWidth > MAX_LINE_WIDTH
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* https://mattdesl.svbtle.com/drawing-lines-is-hard
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* @module echarts-gl/util/geometry/LinesGeometry
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* @author Yi Shen(http://github.com/pissang)
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*/
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import Geometry from 'claygl/src/Geometry';
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import * as echarts from 'echarts/lib/echarts';
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/**
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* @constructor
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* @alias module:echarts-gl/chart/flowGL/Line2D
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* @extends clay.Geometry
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*/
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var LinesGeometry = Geometry.extend(function () {
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return {
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dynamic: true,
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attributes: {
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position: new Geometry.Attribute('position', 'float', 3, 'POSITION')
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}
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};
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},
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/** @lends module: echarts-gl/util/geometry/LinesGeometry.prototype */
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{
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/**
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* Reset offset
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*/
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resetOffset: function () {
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this._vertexOffset = 0;
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this._faceOffset = 0;
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},
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/**
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* @param {number} nVertex
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*/
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setLineCount: function (nLine) {
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var attributes = this.attributes;
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var nVertex = 4 * nLine;
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var nTriangle = 2 * nLine;
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if (this.vertexCount !== nVertex) {
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attributes.position.init(nVertex);
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}
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if (this.triangleCount !== nTriangle) {
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if (nTriangle === 0) {
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this.indices = null;
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} else {
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this.indices = this.vertexCount > 0xffff ? new Uint32Array(nTriangle * 3) : new Uint16Array(nTriangle * 3);
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}
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}
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},
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addLine: function (p) {
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var vertexOffset = this._vertexOffset;
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this.attributes.position.set(vertexOffset, [p[0], p[1], 1]);
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this.attributes.position.set(vertexOffset + 1, [p[0], p[1], -1]);
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this.attributes.position.set(vertexOffset + 2, [p[0], p[1], 2]);
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this.attributes.position.set(vertexOffset + 3, [p[0], p[1], -2]);
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this.setTriangleIndices(this._faceOffset++, [vertexOffset, vertexOffset + 1, vertexOffset + 2]);
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this.setTriangleIndices(this._faceOffset++, [vertexOffset + 1, vertexOffset + 2, vertexOffset + 3]);
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this._vertexOffset += 4;
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}
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});
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export default LinesGeometry;
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