//   六、多边形
// DrawPolygon
/*
绘制面
 */
class DrawPolygon {
    constructor(arg) {
        this.viewer = arg.viewer;
        this.Cesium = arg.Cesium;
        // this.callback=arg.callback;
        this._polygon = null;  //活动面
        this._polygonLast = null;  //最后一个面
        this._positions = []; //活动点
        this._entities_point = [];  //脏数据
        this._entities_polygon = [];  //脏数据
        this._polygonData = null; //用户构造面
        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);
    }

    //返回最后活动面
    get polygon() {
        return this._polygonLast;
    }

    //返回面数据用于加载面
    getData() {
        return this._polygonData;
    }

    // 修改编辑调用计算
    computePosition(data){
        //计算面
        let $this = this
        var lnglatArr = [];
        for (var i = 0; i < data.length; i++) {
            var lnglat = $this.cartesianToLatlng(data[i]);
            lnglatArr.push(lnglat)
        }
        $this._polygonData = lnglatArr;
        return new $this.Cesium.PolygonHierarchy(data);
    }

    //加载面
    addload(data) {
        var $this = this;
        var lnglatArr = [];
        for (var i = 0; i < data.length; i++) {
            var lnglat = $this.LatlngTocartesian(data[i]);
            lnglatArr.push(lnglat)
        }
        return this.viewer.entities.add({
            Type: 'DrawPolygon',
            Position: data,
            id:data.id || $this.objId,
            polygon: {
                hierarchy: new $this.Cesium.PolygonHierarchy(lnglatArr),
                clampToGround: true,
                show: true,
                fill: true,
                material: $this.Cesium.Color.RED.withAlpha(0.9),
                width: 3,
                outlineColor: $this.Cesium.Color.BLACK,
                outlineWidth: 1,
                outline: false
            }
        });
    }

    //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 = $this.getCatesian3FromPX(evt.position);
            if ($this._positions.length == 0) {
                $this._positions.push(cartesian.clone());
            }
            $this.createPoint(cartesian);
            $this._positions.push(cartesian);
        }, $this.Cesium.ScreenSpaceEventType.LEFT_CLICK);
        this.handler.setInputAction(function (evt) { //移动时绘制面
            if ($this._positions.length < 1) return;
            var cartesian = $this.getCatesian3FromPX(evt.endPosition);
            if ($this._positions.length == 3) {
                if (!$this.Cesium.defined($this._polygon)) {
                    $this._polygon = $this.createPolygon();
                }
            }
            $this._positions.pop();
            $this._positions.push(cartesian);
        }, $this.Cesium.ScreenSpaceEventType.MOUSE_MOVE);
        this.handler.setInputAction(function (evt) {
            if (!$this._polygon) return;
            var cartesian = $this.getCatesian3FromPX(evt.position);
            $this._positions.pop();
            // $this._positions.push(cartesian);
            $this.createPoint(cartesian);
            $this._polygonData = $this._positions.concat();
            $this.viewer.entities.remove($this._positions); //移除
            $this._positions = null;
            $this._positions = [];
            var lnglatArr = [];
            for (var i = 0; i < $this._polygonData.length; i++) {
                var lnglat = $this.cartesianToLatlng($this._polygonData[i]);
                lnglatArr.push(lnglat)
            }
            $this._polygonData = lnglatArr;
            var Polygon = $this.addload($this._polygonData);
            $this._entities_polygon.push(Polygon);
            $this._polygonLast = Polygon;
            // if(typeof $this.callback=="function"){
            //     $this.callback(Polygon);
            // }
            $this.clearPoint();
            $this.destroy()
        }, $this.Cesium.ScreenSpaceEventType.RIGHT_CLICK);
    }

    //创建面
    createPolygon() {
        var $this = this;
        var polygon = this.viewer.entities.add({
            polygon: {
                hierarchy: new $this.Cesium.CallbackProperty(function () {
                    return new $this.Cesium.PolygonHierarchy($this._positions);
                }, false),
                clampToGround: true,
                show: true,
                fill: true,
                material: $this.Cesium.Color.RED.withAlpha(0.5),
                width: 3,
                outlineColor: $this.Cesium.Color.BLACK,
                outlineWidth: 1,
                outline: false
            }
        });
        $this._entities_polygon.push(polygon);
        return polygon;
    }

    cartesianToLatlng(cartesian) {
        var latlng = this.viewer.scene.globe.ellipsoid.cartesianToCartographic(cartesian);
        var lat = this.Cesium.Math.toDegrees(latlng.latitude);
        var lng = this.Cesium.Math.toDegrees(latlng.longitude);
        return [lng, lat];
    }

    LatlngTocartesian(latlng) {
        let cartesian3 = this.Cesium.Cartesian3.fromDegrees(latlng[0], latlng[1]);
        return cartesian3
    }

    clearPoint() {
        this.DrawEndEvent.raiseEvent(this._polygonLast, this._polygonData, this.drawType);
        for (var i = 0; i < this._entities_point.length; i++) {
            this.viewer.entities.remove(this._entities_point[i]);
        }
        this._entities_point = [];  //脏数据
    }

    //创建点
    createPoint(cartesian) {
        var $this = this;
        var point = this.viewer.entities.add({
            position: cartesian,
            point: {
                pixelSize: 10,
                color: $this.Cesium.Color.RED,
                heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
            }
        });
        $this._entities_point.push(point);
        return point;
    }


    //销毁事件
    destroy() {
        if (this.handler) {
            this.handler.destroy();
            this.handler = null;
        }
    }

    //清空实体对象
    clear() {
        for (var i = 0; i < this._entities_point.length; i++) {
            this.viewer.entities.remove(this._entities_point[i]);
        }
        for (var i = 0; i < this._entities_polygon.length; i++) {
            this.viewer.entities.remove(this._entities_polygon[i]);
        }
        this._polygon = null;  //活动面
        this._polygonLast = null;  //最后一个面
        this._positions = []; //活动点
        this._entities_point = [];  //脏数据
        this._entities_polygon = [];  //脏数据
        this._polygonData = null; //用户构造面
    }

    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 DrawPolygon