融入ThingJS 3D可视化方案，让城市管线更加智能、高效

/**
* 说明：管线应用
*/
var app = new THING.App({});
// 随机管线连接点
function randomPoints() {
 var points = [[0, 0, 0]];
 var oldType = 2;
 for (var i = 0; i < 50; i++) {
 var old = points[points.length - 1];
 var type = Math.floor(Math.random() * 100) % 3;
 while (oldType == type) {
 type = Math.floor(Math.random() * 100) % 3;
 }
 oldType = type;
 var offset = (Math.random() * 2 + 1) * (Math.random() > 0.5 ? 1 : -1);
 points.push([
 type === 0 ? (old[0] + offset) : old[0],
 type === 1 ? (old[1] + offset) : old[1],
 type === 2 ? (old[2] + offset) : old[2],
 ]);
 }
 return points;
}
// 布置管线
var line = null;
var lineIdx = 1;
function build() {
 // 删除原管线
 if (line) { line.destroy(); }
 // 创建管线
 line = app.create({
 type: 'PolygonLine',
 points: randomPoints(),
 width: 0.2,
 style: {
 image: 'https://thingjs.com/static/images/poly_line_0' + lineIdx + '.png', // 管线中的纹理资源
 }
 });
 // 切换线贴图
 if (lineIdx < 4) { lineIdx++; }
 else { lineIdx = 1; }
 // 开启 UV 动画
 line.scrollUV = true;
 // 设置最适合的摄像机观察位置
 app.camera.fit();
}
build();
new THING.widget.Button('重新布置', build);