maptalks 开发GIS地图（22）maptalks.three.15

1. 此demo演示了自定义动画的生成，动画的样式为一层层荡开的圆圈，类似与水纹。

2. 此demo中第一次使用了类的扩展对象，将圆圈定义为一个对象，样式和动画在其内部进行定义，外部直接

调用添加到对应的经纬度上即可。

3. 参考代码

扩展对象类中有 _animation 函数，该函数为对象自动执行，可在该该函数中加入动画过程代码。而不需要自己

写个定时器之类的去执行动画。

添加 Circle 对象

  var text = Math.round(Math.random() * 10000);
            var material = getMaterial(70, text, color);
            circles = lnglats.map(function (lnglat) {
                var circle = new Circle(lnglat, {
                    radius: 200
                }, material, threeLayer);

                //tooltip test
                circle.setToolTip('id:' + circle.getId(), {
                    showTimeout: 0,
                    eventsPropagation: true,
                    dx: 10
                });


                //infowindow test
                circle.setInfoWindow({
                    content: 'id:' + circle.getId(),
                    title: 'message',
                    animationDuration: 0,
                    autoOpenOn: false
                });


                //event test
                ['click', 'mousemove', 'mouseout', 'mouseover', 'mousedown', 'mouseup', 'dblclick', 'contextmenu'].forEach(function (eventType) {
                    circle.on(eventType, function (e) {
                        console.log(e.type, e);
                    });
                });
                return circle;
            });
            threeLayer.addMesh(circles);

Circle对象扩展类

        class Circle extends maptalks.BaseObject {
            constructor(coordinate, options, material, layer) {
                options = maptalks.Util.extend({}, OPTIONS, options, { layer, coordinate });
                super();
                //Initialize internal configuration
                // https://github.com/maptalks/maptalks.three/blob/1e45f5238f500225ada1deb09b8bab18c1b52cf2/src/BaseObject.js#L135
                this._initOptions(options);
                const { altitude, radius } = options;
                //generate geometry
                const r = layer.distanceToVector3(radius, radius).x
                const geometry = new THREE.CircleBufferGeometry(r, 50);

                //Initialize internal object3d
                // https://github.com/maptalks/maptalks.three/blob/1e45f5238f500225ada1deb09b8bab18c1b52cf2/src/BaseObject.js#L140
                this._createMesh(geometry, material);

                //set object3d position
                const z = layer.distanceToVector3(altitude, altitude).x;
                const position = layer.coordinateToVector3(coordinate, z);
                this.getObject3d().position.copy(position);
                this._scale = 1;
                // this.getObject3d().rotation.x = -Math.PI;
            }

            // test animation
            _animation() {
                this._scale = (this._scale > 1 ? 0 : this._scale);
                this._scale += 0.002;
                this.getObject3d().scale.set(this._scale, this._scale, this._scale);
            }
        }

4. 页面显示

5. 源码地址

https://github.com/WhatGIS/maptalkMap/tree/main/threelayer/demo