//一、点
// DrawPoint
/*
绘制点
 */
class DrawPoint {
    constructor(arg) {
        this.viewer = arg.viewer;
        this.Cesium = arg.Cesium;
        // this.callback=arg.callback;
        this._point = null;  //最后一个点
        this._pointData = null;//点数据用于构造点
        this._entities = []; //脏数据
        this.DrawStartEvent = new Cesium.Event(); //开始绘制事件
        this.DrawEndEvent = new Cesium.Event(); //结束绘制事件 
		
		/* 通用参数集合 */
		this._param = {
			id: "DrawStraightArrow",
			polygonColor: 'rgba(0,255,0,0.5)', //面填充颜色
			outlineColor: 'rgba(255, 255, 255, 1)', //边框颜色
			outlineWidth: 1, //边框宽度
		}
		
		/* 创建面材质 */
		this.polygonMaterial = Cesium.Color.fromCssColorString(this._param.polygonColor);
		/* 创建线材质 */
		// this.outlineMaterial = new Cesium.PolylineDashMaterialProperty({//曲线
		// 	dashLength: 16,
		// 	color: Cesium.Color.fromCssColorString(this._param.outlineColor)
		// });
		this.outlineMaterial = Cesium.Color.fromCssColorString(this._param.outlineColor);
    }
 
    //返回最后活动点
    get point() {
        return this._point;
    }
 
    //加载点
    addload(data) {
        return this.createPoint(data);
    }
 
    //返回点数据用于加载点
    getData() {
        return this._pointData;
    }

    // 修改编辑调用计算
    computePosition(data) {
        let $this = this
        var lnglatArr = [];
        for (var i = 0; i < data.length; i++) {
            var lnglat = $this.cartesianToLatlng(data[i]);
            lnglatArr.push(lnglat)
        }
        $this._pointData = lnglatArr;
        let point = lnglatArr[0]
        return $this.Cesium.Cartesian3.fromDegrees(point[0],point[1])
    }
 
    //开始绘制
    startCreate(drawType) {
        this.drawType = drawType;
        var $this = this;
        this.handler = new this.Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
        this.handler.setInputAction(function (evt) { //单机开始绘制
            var cartesian = $this.getCatesian3FromPX(evt.position);
            if (!cartesian) return;
            let latlon = $this.cartesianToLatlng(cartesian)
            var point = $this.createPoint(latlon);
            $this._pointData = cartesian;
            $this._point = point;
            // if(typeof $this.callback=="function"){
            //     $this.callback(point);
            // }
            
            $this.DrawEndEvent.raiseEvent($this._point, latlon, $this.drawType);
            $this.destroy()
        }, $this.Cesium.ScreenSpaceEventType.LEFT_CLICK);
    }
 
    //创建点
    createPoint(cartesian) {
        var $this = this;
        var point = this.viewer.entities.add({
            Type:'DrawPoint',
            Position:[cartesian],
            position: $this.Cesium.Cartesian3.fromDegrees(cartesian[0],cartesian[1]),
            id:cartesian.id || $this.objId,
            billboard: {
                image: "./static/poi2.png",
                // scaleByDistance: new Cesium.NearFarScalar(300, 1, 1200, 0.4), //设置随图缩放距离和比例
                // distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 10000), //设置可见距离 10000米可见
                verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
                // clampToGround: true
            },
        });
        $this._entities.push(point); //加载脏数据
        return point;
    }

    cartesianToLatlng(cartesian) {
        let ellipsoid = this.viewer.scene.globe.ellipsoid
        let cartographic = ellipsoid.cartesianToCartographic(cartesian);
        let lat = Cesium.Math.toDegrees(cartographic.latitude);
        let lng = Cesium.Math.toDegrees(cartographic.longitude);
        return [lng, lat];
    }
 
    //销毁鼠标事件
    destroy() {
        if (this.handler) {
            this.handler.destroy();
            this.handler = null;
        }
    }
 
    //清空实体对象
    clear() {
        for (var i = 0; i < this._entities.length; i++) {
            this.viewer.entities.remove(this._entities[i]);
        }
        this._entities = [];
        this._point = null;
    }
 
    getCatesian3FromPX(px) {
        var cartesian;
        var ray = this.viewer.camera.getPickRay(px);
        if (!ray) return null;
        cartesian = this.viewer.scene.globe.pick(ray, this.viewer.scene);
        return cartesian;
    }
}
 
export default DrawPoint;