/*
九、绘制弓形面
 */
class DrawBowPlane {
    constructor(arg) {
        this.viewer = arg.viewer;
        this.Cesium = arg.Cesium;
        this.tt = 0.4;
        this.floatingPoint = null;//标识点
        this.drawHandler = null;//画事件
        this.DrawBowPlane = null;//弓形
        this._DrawBowPlaneLast = null; //最后一个弓形
        this._positions = [];//活动点
        this._entities_point = [];//脏数据
        this._entities_PincerArrow = [];//脏数据
        this._DrawBowPlaneData = null; //用于构造弓形
        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);
    }

    //返回弓形
    get PincerArrow() {
        return this._DrawBowPlaneLast;
    }

    //返回弓形数据用于加载弓形
    getData() {
        return this._DrawBowPlaneData;
    }

    // 修改编辑调用计算
    computePosition(data) {
        var $this = this;
        if (data.length < 3) {
            return;
        }
        var DrawBowPlane = [];
        let positions = [];
        for (var i = 0; i < data.length; i++) {
            positions.push($this.cartesianToLatlng(data[i]));
            var cart3 =$this.lonLatToMercator($this.cartesianToLatlng(data[i]));
            DrawBowPlane.push(cart3);
        }
        let [pnt1, pnt2, pnt3, startAngle, endAngle] = [DrawBowPlane[0], DrawBowPlane[2], DrawBowPlane[1], null, null];
        let center = $this.getCircleCenterOfThreePoints(pnt1, pnt2, pnt3)
        let radius = $this.MathDistance(pnt1, center)
        let angle1 = $this.getAzimuth(pnt1, center)
        let angle2 = $this.getAzimuth(pnt2, center)
        if ($this.isClockWise(pnt1, pnt2, pnt3)) {
            startAngle = angle2
            endAngle = angle1
            } else {
            startAngle = angle1
            endAngle = angle2
        }
        let getArcPoint = $this.getArcPoints(center, radius, startAngle, endAngle);
        let pHierarchy = [];
        for (var l = 0; l < getArcPoint.length; l++) {
            var cart3 =$this.LatlngTocartesian($this.WebMercator2lonLat(getArcPoint[l]));
            pHierarchy.push(cart3);
        }
        pHierarchy.push(pHierarchy[0])
        $this._DrawBowPlaneData = positions
        return new $this.Cesium.PolygonHierarchy(pHierarchy)
    }

    //加载
    addload(data) {
        var $this = this;
        if (data.length < 3) {
            return;
        }
        var DrawBowPlane = [];
        for (var i = 0; i < data.length; i++) {
            var cart3 =$this.lonLatToMercator(data[i]);
            DrawBowPlane.push(cart3);
        }
        let [pnt1, pnt2, pnt3, startAngle, endAngle] = [DrawBowPlane[0], DrawBowPlane[2], DrawBowPlane[1], null, null];
        let center = $this.getCircleCenterOfThreePoints(pnt1, pnt2, pnt3)
        let radius = $this.MathDistance(pnt1, center)
        let angle1 = $this.getAzimuth(pnt1, center)
        let angle2 = $this.getAzimuth(pnt2, center)
        if ($this.isClockWise(pnt1, pnt2, pnt3)) {
            startAngle = angle2
            endAngle = angle1
          } else {
            startAngle = angle1
            endAngle = angle2
        }
        let getArcPoint = $this.getArcPoints(center, radius, startAngle, endAngle);
        let pHierarchy = [];
        for (var l = 0; l < getArcPoint.length; l++) {
            var cart3 =$this.LatlngTocartesian($this.WebMercator2lonLat(getArcPoint[l]));
            pHierarchy.push(cart3);
        }
        pHierarchy.push(pHierarchy[0])
        var arrowEntity = $this.viewer.entities.add({
            Type: 'DrawBowPlane',
            Position: data,
            id: data.id || $this.objId,
            polygon: {
                hierarchy: new $this.Cesium.PolygonHierarchy(pHierarchy),
                show: true,
                material: $this.Cesium.Color.YELLOW,
                width: 3,
                clampToGround: true,
                outlineWidth:3,
                outline: true,
                outlineColor: Cesium.Color.MAGENTA,
            }
        }
        )
        return arrowEntity
    }


    // 开始创建
    startCreate(drawType) {
        this.drawType = drawType
        var $this = this;
        this.handler = new $this.Cesium.ScreenSpaceEventHandler($this.viewer.scene.canvas);
        this.handler.setInputAction(function (event) {
            //屏幕坐标转世界坐标
            var position = event.position;
            if (!$this.Cesium.defined(position)) {
                return;
            }
            var ray = $this.viewer.camera.getPickRay(position);
            if (!$this.Cesium.defined(ray)) {
                return;
            }
            var cartesian = $this.viewer.scene.globe.pick(ray, $this.viewer.scene);
            if (!$this.Cesium.defined(cartesian)) {
                return;
            }

            if ($this._positions.length == 0) {
                $this._positions.push(cartesian.clone());
                $this.floatingPoint = $this.createPoint(cartesian);
            }

            if ($this._positions.length <= 2) {
                $this.createPoint(cartesian); // 绘制点
                $this._positions.push(cartesian);
            }
        }, Cesium.ScreenSpaceEventType.LEFT_CLICK);


        this.handler.setInputAction(function (event) { //移动时绘制面
            //console.log("_positions",_positions);
            if ($this._positions.length < 2) {
                return;
            }

            //屏幕坐标转世界坐标
            var position = event.endPosition;
            if (!$this.Cesium.defined(position)) {
                return;
            }
            var ray = $this.viewer.camera.getPickRay(position);
            if (!$this.Cesium.defined(ray)) {
                return;
            }
            var cartesian = $this.viewer.scene.globe.pick(ray, $this.viewer.scene);
            if (!$this.Cesium.defined(cartesian)) {
                return;
            }
            //console.log("点击地图移动采集的点：",cartesian);
            if (!$this.Cesium.defined($this.DrawBowPlane)) {
                $this.DrawBowPlane = $this.createDrawBowPlane();
            }
            $this.floatingPoint.position.setValue(cartesian);
            if ($this.DrawBowPlane) {
                //替换最后一个点
                // _positions.pop();
                // _positions.push(cartesian);
                //替换中间点
                if ($this._positions.length == 3) {
                    $this._positions[1] = cartesian;
                } else {
                    $this._positions.pop();
                    $this._positions.push(cartesian);
                }

            }
        }, Cesium.ScreenSpaceEventType.MOUSE_MOVE);


        //右击停止采集
        this.handler.setInputAction(function (movement) {

            if ($this._positions.length >= 3) {
                $this._DrawBowPlaneData = $this._positions.concat();
                $this.viewer.entities.remove($this.DrawBowPlane); //移除
                $this.DrawBowPlane = null;
                var lnglatArr = [];
                for (var i = 0; i < $this._DrawBowPlaneData.length; i++) {
                    var lnglat = $this.cartesianToLatlng($this._DrawBowPlaneData[i]);
                    lnglatArr.push(lnglat)
                }
                $this._DrawBowPlaneData = lnglatArr;
                var pincerArrow = $this.addload(lnglatArr); //加载
                $this._entities_PincerArrow.push(pincerArrow);
                $this._DrawBowPlaneLast = pincerArrow;
                $this.viewer.entities.remove($this.floatingPoint);
                $this.floatingPoint = null;

                //删除关键点
                $this.clearPoint();
                $this.destroy()
            }
        }, Cesium.ScreenSpaceEventType.RIGHT_CLICK);

    }

    //创建弓形
    createDrawBowPlane() {
        let $this = this
        var DrawBowPlaneEntity = $this.viewer.entities.add({
            polygon: {
                hierarchy: new $this.Cesium.CallbackProperty(function () {
                    if ($this._positions.length < 3) {
                        return;
                    }
                    var DrawBowPlane = [];
                    for (var i = 0; i < $this._positions.length; i++) {
                        var cart3 =$this.lonLatToMercator($this.cartesianToLatlng($this._positions[i]));
                        DrawBowPlane.push(cart3);
                    }
                    let [pnt1, pnt2, pnt3, startAngle, endAngle] = [DrawBowPlane[0], DrawBowPlane[2], DrawBowPlane[1], null, null];
                    let center = $this.getCircleCenterOfThreePoints(pnt1, pnt2, pnt3)
                    let radius = $this.MathDistance(pnt1, center)
                    let angle1 = $this.getAzimuth(pnt1, center)
                    let angle2 = $this.getAzimuth(pnt2, center)
                    if ($this.isClockWise(pnt1, pnt2, pnt3)) {
                        startAngle = angle2
                        endAngle = angle1
                      } else {
                        startAngle = angle1
                        endAngle = angle2
                    }
                    let getArcPoint = $this.getArcPoints(center, radius, startAngle, endAngle);
                    let pHierarchy = [];
                    for (var l = 0; l < getArcPoint.length; l++) {
                        var cart3 =$this.LatlngTocartesian($this.WebMercator2lonLat(getArcPoint[l]));
                        pHierarchy.push(cart3);
                    }
                    pHierarchy.push(pHierarchy[0])
                    return new $this.Cesium.PolygonHierarchy(pHierarchy)
                }, false),
                show: true,
                material: $this.Cesium.Color.YELLOW,
                clampToGround: true
            }
        }
        )
        $this._entities_PincerArrow.push(DrawBowPlaneEntity);
        return DrawBowPlaneEntity
    }

    //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;
    }

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

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

    clearPoint() {
        this.DrawEndEvent.raiseEvent(this._DrawBowPlaneLast, this._DrawBowPlaneData, 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
    }

    //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_PincerArrow.length; i++) {
            this.viewer.entities.remove(this._entities_PincerArrow[i]);
        }

        this.floatingPoint = null;//标识点
        this._PincerArrow = null; //活动弓形
        this._PincerArrowLast = null; //最后一个弓形
        this._positions = [];  //活动点
        this._entities_point = [];  //脏数据
        this._entities_PincerArrow = [];  //脏数据
        this._PincerArrowData = null; //用于构造弓形数据
    }

    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;
    }

    _computeTempPositions() {
        var _this = this;

        var pnts = [].concat(_this._positions);
        var num = pnts.length;
        var first = pnts[0];
        var last = pnts[num - 1];
        if (_this._isSimpleXYZ(first, last) == false) {
            pnts.push(first);
            num += 1;
        }
        _this.tempPositions = [];
        for (var i = 1; i < num; i++) {
            var p1 = pnts[i - 1];
            var p2 = pnts[i];
            var cp = _this._computeCenterPotition(p1, p2);
            _this.tempPositions.push(p1);
            _this.tempPositions.push(cp);
        }
    }

    _isSimpleXYZ(p1, p2) {
        if (p1.x == p2.x && p1.y == p2.y && p1.z == p2.z) {
            return true;
        }
        return false;
    }

    _computeCenterPotition(p1, p2) {
        var _this = this;
        var c1 = _this.viewer.scene.globe.ellipsoid.cartesianToCartographic(p1);
        var c2 = _this.viewer.scene.globe.ellipsoid.cartesianToCartographic(p2);
        var cm = new _this.Cesium.EllipsoidGeodesic(c1, c2).interpolateUsingFraction(0.5);
        var cp = _this.viewer.scene.globe.ellipsoid.cartographicToCartesian(cm);
        return cp;
    }
    /**
     * 笛卡尔坐标转经纬度坐标
     */
    getLonLat(cartesian) {
        var cartographic = this.viewer.scene.globe.ellipsoid.cartesianToCartographic(cartesian);
        cartographic.height = this.viewer.scene.globe.getHeight(cartographic);
        var pos = {
            lon: cartographic.longitude,
            lat: cartographic.latitude,
            alt: cartographic.height
        };
        pos.lon = this.Cesium.Math.toDegrees(pos.lon);
        pos.lat = this.Cesium.Math.toDegrees(pos.lat);
        return pos;
    }

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

     /**
     * 经纬度坐标转墨卡托坐标
     */
    // 墨卡托坐标系：展开地球，赤道作为x轴，向东为x轴正方，本初子午线作为y轴，向北为y轴正方向。
    // 数字20037508.34是地球赤道周长的一半：地球半径6378137米，赤道周长2*PI*r = 2 * 20037508.3427892，墨卡托坐标x轴区间[-20037508.3427892,20037508.3427892]
    lonLatToMercator(Latlng) {
        var E = Latlng[0];
        var N = Latlng[1];
        var x = E * 20037508.34 / 180;
        var y = Math.log(Math.tan((90 + N) * Math.PI / 360)) / (Math.PI / 180);
        y = y * 20037508.34 / 180;
        return [x, y]
    }
    /**
     * 墨卡托坐标转经纬度坐标转
     */
    WebMercator2lonLat(mercator) {
        let x = mercator[0] / 20037508.34 * 180;
        let ly = mercator[1] / 20037508.34 * 180;
        let y = 180 / Math.PI * (2 * Math.atan(Math.exp(ly * Math.PI / 180)) - Math.PI / 2)
        return [x, y];
    }

    ////////////////////////////////////////弓形/////////////////////////////////////////////////////
    /**
 * 通过三个点确定一个圆的中心点
 * @param point1
 * @param point2
 * @param point3
 */
    getCircleCenterOfThreePoints(point1, point2, point3) {
        let pntA = [(point1[0] + point2[0]) / 2, (point1[1] + point2[1]) / 2]
        let pntB = [pntA[0] - point1[1] + point2[1], pntA[1] + point1[0] - point2[0]]
        let pntC = [(point1[0] + point3[0]) / 2, (point1[1] + point3[1]) / 2]
        let pntD = [pntC[0] - point1[1] + point3[1], pntC[1] + point1[0] - point3[0]]
        return this.getIntersectPoint(pntA, pntB, pntC, pntD)
    }

    /**
   * 获取交集的点
   * @param pntA
   * @param pntB
   * @param pntC
   * @param pntD
   * @returns {[*,*]}
   */
    getIntersectPoint(pntA, pntB, pntC, pntD) {
        if (pntA[1] === pntB[1]) {
            let f = (pntD[0] - pntC[0]) / (pntD[1] - pntC[1])
            let x = f * (pntA[1] - pntC[1]) + pntC[0]
            let y = pntA[1]
            return [x, y]
        }
        if (pntC[1] === pntD[1]) {
            let e = (pntB[0] - pntA[0]) / (pntB[1] - pntA[1])
            let x = e * (pntC[1] - pntA[1]) + pntA[0]
            let y = pntC[1]
            return [x, y]
        }
        let e = (pntB[0] - pntA[0]) / (pntB[1] - pntA[1])
        let f = (pntD[0] - pntC[0]) / (pntD[1] - pntC[1])
        let y = (e * pntA[1] - pntA[0] - f * pntC[1] + pntC[0]) / (e - f)
        let x = e * y - e * pntA[1] + pntA[0]
        return [x, y]
    }


    /**
   * 计算两个坐标之间的距离
   * @ignore
   * @param pnt1
   * @param pnt2
   * @returns {number}
   * @constructor
   */
    MathDistance(pnt1, pnt2) {
        return (Math.sqrt(Math.pow((pnt1[0] - pnt2[0]), 2) + Math.pow((pnt1[1] - pnt2[1]), 2)))
    }


    /**
   * 获取方位角（地平经度）
   * @param startPoint
   * @param endPoint
   * @returns {*}
   */
    getAzimuth(startPoint, endPoint) {
        let azimuth
        let angle = Math.asin(Math.abs(endPoint[1] - startPoint[1]) / (this.MathDistance(startPoint, endPoint)))
        if (endPoint[1] >= startPoint[1] && endPoint[0] >= startPoint[0]) {
            azimuth = angle + Math.PI
        } else if (endPoint[1] >= startPoint[1] && endPoint[0] < startPoint[0]) {
            azimuth = Math.PI * 2 - angle
        } else if (endPoint[1] < startPoint[1] && endPoint[0] < startPoint[0]) {
            azimuth = angle
        } else if (endPoint[1] < startPoint[1] && endPoint[0] >= startPoint[0]) {
            azimuth = Math.PI - angle
        }
        return azimuth
    }

    /**
     * 判断是否是顺时针
     * @param pnt1
     * @param pnt2
     * @param pnt3
     * @returns {boolean}
     */
    isClockWise (pnt1, pnt2, pnt3) {
        return ((pnt3[1] - pnt1[1]) * (pnt2[0] - pnt1[0]) > (pnt2[1] - pnt1[1]) * (pnt3[0] - pnt1[0]))
    }


    /**
   * 插值弓形线段点
   * @param center
   * @param radius
   * @param startAngle
   * @param endAngle
   * @returns {null}
   */
    getArcPoints(center, radius, startAngle, endAngle) {
        let [x, y, pnts, angleDiff] = [null, null, [], (endAngle - startAngle)]
        angleDiff = ((angleDiff < 0) ? (angleDiff + (Math.PI * 2)) : angleDiff)
        for (let i = 0; i <= 100; i++) {
            let angle = startAngle + angleDiff * i / 100
            x = center[0] + radius * Math.cos(angle)
            y = center[1] + radius * Math.sin(angle)
            pnts.push([x, y])
        }
        return pnts
    }

}

export default DrawBowPlane