/** * Sigma.js WebGL Renderer Node Program * ===================================== * * Simple program rendering nodes as triangles. * It does not extend AbstractNodeProgram, which works very differently, and * really targets the gl.POINTS drawing methods. * @module */ import { NodeDisplayData } from "sigma/types"; import { floatColor } from "sigma/utils"; import TriangleProgram from "./sigmajs-triangle-abstract"; const POINTS = 12; const ATTRIBUTES = 5; const ANGLE_1_1 = - (1 * Math.PI) / 4; const ANGLE_1_2 = (1 * Math.PI) / 4; const ANGLE_1_3 = (3 * Math.PI) / 4; const ANGLE_2_1 = (3 * Math.PI) / 4; const ANGLE_2_2 = (5 * Math.PI) / 4; const ANGLE_2_3 = (7 * Math.PI) / 4; export default class NodeProgram extends TriangleProgram { constructor(gl) { super(gl, POINTS, ATTRIBUTES); } triangleDefinitions(data) { const gray = '#aaa'; const size = data.size / 1.7; // experimental... const contourSize = size + 0.8; // experimental... return [ { x: data.x, y: data.y, size: contourSize, color: gray, angles: [ANGLE_1_1, ANGLE_1_2, ANGLE_1_3] }, { x: data.x, y: data.y, size: contourSize, color: gray, angles: [ANGLE_2_1, ANGLE_2_2, ANGLE_2_3] }, { x: data.x, y: data.y, size: size, color: data.color, angles: [ANGLE_1_1, ANGLE_1_2, ANGLE_1_3] }, { x: data.x, y: data.y, size: size, color: data.color, angles: [ANGLE_2_1, ANGLE_2_2, ANGLE_2_3] } ]; } }