visual.js
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import objectManage from './maputils';
export default class visual {
constructor() {
objectManage.viewer.scene.viewFlag = true;
this.pointHandler = new Cesium.DrawHandler(objectManage.viewer, Cesium.DrawMode.Point);
this.viewshed3D = new Cesium.ViewShed3D(objectManage.viewer.scene);
this.viewPosition;
this.viewModel = {
direction: 1.0,
pitch: 1.0,
distance: 1.0,
verticalFov: 1.0,
horizontalFov: 1.0,
visibleAreaColor: '#ffffffff',
invisibleAreaColor: '#ffffffff'
};
Cesium.knockout.track(this.viewModel);
this.init(objectManage.viewer.scene);
}
init(scene) {
this.handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
this.handler.setInputAction(e => {
// 若此标记为false，则激活对可视域分析对象的操作
if (!scene.viewFlag) {
//获取鼠标屏幕坐标,并将其转化成笛卡尔坐标
var position = e.endPosition;
var last = scene.pickPosition(position);
//计算该点与视口位置点坐标的距离
var distance = Cesium.Cartesian3.distance(this.viewPosition, last);
if (distance > 0) {
// 将鼠标当前点坐标转化成经纬度
var cartographic = Cesium.Cartographic.fromCartesian(last);
var longitude = Cesium.Math.toDegrees(cartographic.longitude);
var latitude = Cesium.Math.toDegrees(cartographic.latitude);
var height = cartographic.height;
// 通过该点设置可视域分析对象的距离及方向
this.viewshed3D.setDistDirByPoint([longitude, latitude, height]);
}
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
this.handler.setInputAction(e => {
//鼠标右键事件回调，不再执行鼠标移动事件中对可视域的操作
scene.viewFlag = true;
Object.assign(this.viewModel, {
direction: this.viewshed3D.direction, pitch: this.viewshed3D.pitch, distance: this.viewshed3D.distance,
horizontalFov: this.viewshed3D.horizontalFov, verticalFov: this.viewshed3D.verticalFov
})
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
this.pointHandler.drawEvt.addEventListener(result => {
var point = result.object;
var position = point.position;
this.viewPosition = position;
// 将获取的点的位置转化成经纬度
var cartographic = Cesium.Cartographic.fromCartesian(position);
var longitude = Cesium.Math.toDegrees(cartographic.longitude);
var latitude = Cesium.Math.toDegrees(cartographic.latitude);
var height = cartographic.height + 1.8;
point.position = Cesium.Cartesian3.fromDegrees(longitude, latitude, height);
if (objectManage.viewer.scene.viewFlag) {
// 设置视口位置
this.viewshed3D.viewPosition = [longitude, latitude, height];
this.viewshed3D.build();
// 将标记置为false以激活鼠标移动回调里面的设置可视域操作
objectManage.viewer.scene.viewFlag = false;
}
});
}
chooseView() {
if (this.pointHandler.active) return;
//先清除之前的可视域分析
objectManage.viewer.entities.removeAll();
this.viewshed3D.distance = 0.1;
objectManage.viewer.scene.viewFlag = true;
//激活绘制点类
this.pointHandler.activate();
}
remove() {
this.viewshed3D.destroy();
this.viewshed3D = new Cesium.ViewShed3D(objectManage.viewer.scene);
}
}