103 lines
2.8 KiB
JavaScript
103 lines
2.8 KiB
JavaScript
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/**
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* @module echarts-gl/util/geometry/QuadsGeometry
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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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import dynamicConvertMixin from './dynamicConvertMixin';
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import glmatrix from 'claygl/src/dep/glmatrix';
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var vec3 = glmatrix.vec3;
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/**
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* @constructor
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* @alias module:echarts-gl/util/geometry/QuadsGeometry
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* @extends clay.Geometry
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*/
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var QuadsGeometry = Geometry.extend(function () {
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return {
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segmentScale: 1,
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/**
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* Need to use mesh to expand lines if lineWidth > MAX_LINE_WIDTH
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*/
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useNativeLine: true,
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attributes: {
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position: new Geometry.Attribute('position', 'float', 3, 'POSITION'),
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normal: new Geometry.Attribute('normal', 'float', 3, 'NORMAL'),
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color: new Geometry.Attribute('color', 'float', 4, 'COLOR')
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}
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};
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},
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/** @lends module: echarts-gl/util/geometry/QuadsGeometry.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} nQuad
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*/
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setQuadCount: function (nQuad) {
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var attributes = this.attributes;
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var vertexCount = this.getQuadVertexCount() * nQuad;
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var triangleCount = this.getQuadTriangleCount() * nQuad;
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if (this.vertexCount !== vertexCount) {
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attributes.position.init(vertexCount);
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attributes.normal.init(vertexCount);
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attributes.color.init(vertexCount);
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}
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if (this.triangleCount !== triangleCount) {
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this.indices = vertexCount > 0xffff ? new Uint32Array(triangleCount * 3) : new Uint16Array(triangleCount * 3);
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}
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},
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getQuadVertexCount: function () {
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return 4;
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},
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getQuadTriangleCount: function () {
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return 2;
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},
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/**
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* Add a quad, which in following order:
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* 0-----1
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* 3-----2
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*/
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addQuad: function () {
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var a = vec3.create();
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var b = vec3.create();
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var normal = vec3.create();
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var indices = [0, 3, 1, 3, 2, 1];
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return function (coords, color) {
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var positionAttr = this.attributes.position;
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var normalAttr = this.attributes.normal;
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var colorAttr = this.attributes.color;
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vec3.sub(a, coords[1], coords[0]);
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vec3.sub(b, coords[2], coords[1]);
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vec3.cross(normal, a, b);
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vec3.normalize(normal, normal);
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for (var i = 0; i < 4; i++) {
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positionAttr.set(this._vertexOffset + i, coords[i]);
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colorAttr.set(this._vertexOffset + i, color);
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normalAttr.set(this._vertexOffset + i, normal);
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}
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var idx = this._faceOffset * 3;
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for (var i = 0; i < 6; i++) {
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this.indices[idx + i] = indices[i] + this._vertexOffset;
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}
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this._vertexOffset += 4;
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this._faceOffset += 2;
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};
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}()
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});
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echarts.util.defaults(QuadsGeometry.prototype, dynamicConvertMixin);
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export default QuadsGeometry;
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