模型变换

使用 Object3D 类型的 position 和 rotateZ 等方法可对三维对象进行模型变换，本例模拟了雷达扫描的实现。

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          <!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>模型变换</title>
    <meta name="description" content="使用 Object3D 类型的 position 和 rotateZ 等方法可对三维对象进行模型变换，本例模拟了雷达扫描的实现。">
    <style>
        html,
        body,
        #container {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
        }
    </style>
</head>
<body>
<div id="container"></div>
<script src="//cache.amap.com/lbs/static/es5.min.js"></script>
<script>
    window.forceWebGL = true;
</script>
<script src="//webapi.amap.com/maps?v=1.4.15&key=您申请的key值&plugin=Map3D"></script>
<script>
    var map = new AMap.Map('container', {
        viewMode: '3D',
        buildingAnimation: false,
        showIndoorMap: false,
        center: [116.470323, 39.992598],
        pitch: 30,
        zoom: 17
    });

    var object3Dlayer = new AMap.Object3DLayer();
    map.add(object3Dlayer);

    var radar;
    var buildRadar = function () {
        radar = new AMap.Object3D.Mesh();
        radar.transparent = true;
        radar.backOrFront = 'front';

        var geometry = radar.geometry;
        var radius = 200; // 米
        radius = radius / map.getResolution(map.getCenter(), 20);
        var unit = 1;
        var range = 200;
        var count = range / unit;

        for (var i = 0; i < count; i += 1) {
            var angle1 = i * unit * Math.PI / 180;
            var angle2 = (i + 1) * unit * Math.PI / 180;

            var p1x = Math.cos(angle1) * radius;
            var p1y = Math.sin(angle1) * radius;
            var p2x = Math.cos(angle2) * radius;
            var p2y = Math.sin(angle2) * radius;

            geometry.vertices.push(0, 0, 0);
            geometry.vertices.push(p1x, p1y, 0);
            geometry.vertices.push(p2x, p2y, 0);

            var opacityStart = getOpacity(i / count);
            var opacityEnd = getOpacity((i + 1) / count);

            geometry.vertexColors.push(0, 1, 0.2, opacityStart);
            geometry.vertexColors.push(0, 1, 0.2, opacityStart);
            geometry.vertexColors.push(0, 1, 0.2, opacityEnd);
        }

        radar.position(map.getCenter());

        object3Dlayer.add(radar);
    };

    function getOpacity(scale) {
        return 1 - Math.pow(scale, 0.3);
    }

    function scan() {
        radar.rotateZ(-2);
        AMap.Util.requestAnimFrame(scan);
    }

    buildRadar();
    scan();
    
</script>
</body>
</html>
        

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