// var viewshedarr = []
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// function onViewshed(options)
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// {
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// // 分析参数
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// // var viewModel = { verticalAngle: 90, horizontalAngle: 120, distance: 10 };
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// // console.log(options);
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// // 添加可视域
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// var viewshed = new Cesium.ViewShed3D(viewer, {
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// horizontalAngle: Number(options.horizontalAngle),
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// verticalAngle: Number(options.verticalAngle),
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// distance: Number(options.distance),
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// frustum:true,
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// calback: function () {
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// options.distance = viewshed.distance
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// }
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// });
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// viewshedarr.push(viewshed);
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// }
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// function clearViewshed(){
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// for(let i in viewshedarr){
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// viewshedarr[i]._handler = viewshedarr[i]._handler&&viewshedarr[i]._handler.destroy();
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// viewshedarr[i].removeRadar();
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// viewer.scene.primitives.remove(viewshedarr[i]);
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// }
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// viewshedarr.length = 0;
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// }
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let handler;
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var startPosition;
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var endPosition;
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function onViewshed(options)
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{
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ViewShed.clear();
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let i = 0
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handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas)
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handler.setInputAction(movement =>
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{
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i++
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if(i === 1)
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{
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startPosition = viewer.scene.pickPosition(movement.position) //鼠标点击一次获取开始坐标
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if(!startPosition) return
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// var viewShed = new ViewShed(viewer,{
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// viewPosition: startPosition,
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// viewPositionEnd: startPosition,
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// horizontalViewAngle: options.horizontalViewAngle,
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// verticalViewAngle: options.verticalViewAngle
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// })
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// var viewShed = new Cesium.ViewShed();
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var op = {
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viewPosition: startPosition,
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viewPositionEnd: startPosition,
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horizontalViewAngle: options.horizontalAngle,
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verticalViewAngle: options.verticalAngle
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};
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ViewShed.create(viewer,op);
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handler.setInputAction(movement => //鼠标移动的事件
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{
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endPosition = viewer.scene.pickPosition(movement.endPosition)
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if(!endPosition) return
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ViewShed.updatePosition(endPosition)
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if(!ViewShed.sketch) {
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ViewShed.drawSketch()
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}
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}, Cesium.ScreenSpaceEventType.MOUSE_MOVE)
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}
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if(i === 2) //鼠标点击两次获取结束坐标
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{
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i = 0
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endPosition = viewer.scene.pickPosition(movement.position)
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ViewShed.updatePosition(endPosition)
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ViewShed.update()
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handler = handler && handler.destroy() //销毁鼠标事件
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}
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}, Cesium.ScreenSpaceEventType.LEFT_CLICK)
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}
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function clearViewshed(){
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ViewShed.clear();
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}
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