var DrawPolygon = {
    SG: null,

    polygon: null,

    callback: null,

    isDrawing: false,

    isEditing: false,

    groupName: "图形绘制",

    polygonName: "_polygon_",

    // 开始
    start: function (callback) {
        try {
            if (this.isDrawing) {
                return;
            }

            this.polygon = null;
            this.isDrawing = true;
            this.isEditing = false;
            this.callback = callback;
            this.SG.Window.SetInputMode(1);
            //this.SG.Application.CPUSaveMode = true;

            this.addEvent();
        } catch (e) {
            console.error(e);
        }
    },

    // 获取组ID
    getGid: function () {
        var gid = this.SG.ProjectTree.FindItem(this.groupName);
        if (gid) return gid;

        return this.SG.ProjectTree.CreateGroup(this.groupName);
    },

    // 删除组
    delGroup:function(){
        var gid = this.SG.ProjectTree.FindItem(this.groupName);
        if (gid) {
            this.SG.ProjectTree.DeleteItem(gid);
        }
    },

    // 添加事件
    addEvent: function () {
        this.SG.AttachEvent("OnLButtonDown", this.onLButtonDown);
        this.SG.AttachEvent("OnRButtonDown", this.onRButtonDown);
        this.SG.AttachEvent("OnFrame", this.onFrame);
    },

    // 移除事件
    rmEvent: function () {
        this.SG.DetachEvent("OnLButtonDown", this.onLButtonDown);
        this.SG.DetachEvent("OnRButtonDown", this.onRButtonDown);
        this.SG.DetachEvent("OnFrame", this.onFrame);
    },

    // 左键按下事件
    onLButtonDown: function (Flags, X, Y) {
        var _this = DrawPolygon;
        try {
            if (X < 0 || Y < 0 || _this.isEditing) {
                return;
            }

            var wpi = _this.SG.Window.PixelToWorld(X, Y, -1); // 0-Terrain
            wpi.Position.ChangeAltitudeType(3); // 0-RELATIVE，3-ABSOLUTE
            if (wpi.Position.X == 0 || wpi.Position.Y == 0) {
                return;
            }

            _this.isEditing = true;
            if (_this.polygon) {
                _this.polygon.Geometry.ExteriorRing.Points.AddPoint(wpi.Position.X, wpi.Position.Y, wpi.Position.Altitude);
            } else {
                _this.polygon = _this.createPolygon(wpi);
                _this.polygon.Geometry.StartEdit();
            }
            _this.isEditing = false;
        } catch (e) {
            _this.isEditing = false;
            console.error(e);
        }

        return true;
    },

    // 创建多边形
    createPolygon: function (wpi) {
        var arr = [
          wpi.Position.X,
          wpi.Position.Y,
          wpi.Position.Altitude,
          wpi.Position.X + 0.0000001,
          wpi.Position.Y + 0.0000001,
          wpi.Position.Altitude,
          wpi.Position.X + 0.0000002,
          wpi.Position.Y + 0.0000002,
          wpi.Position.Altitude
        ];

        var gid = this.SG.ProjectTree.FindItem(this.groupName);
        if (!gid) {
            gid = this.SG.ProjectTree.CreateLockedGroup(this.groupName, this.SG.ProjectTree.RootID);
        }

        var id = this.SG.ProjectTree.FindItem(this.groupName + "\\" + this.polygonName);
        if (id) {
            this.SG.ProjectTree.DeleteItem(id);
        }

        var fillColor = this.SG.Creator.CreateColor(255, 0, 0, 51);
        var ring = this.SG.Creator.GeometryCreator.CreateLinearRingGeometry(arr);
        var geometry = this.SG.Creator.GeometryCreator.CreatePolygonGeometry(ring, null);
        var polygon = this.SG.Creator.CreatePolygon(geometry, "#ff0000", fillColor, 3, gid, this.polygonName);//2-ON_TERRAIN, 3-ABSOLUTE, 1-PIVOT_RELATIVE, 0-TERRAIN_RELATIVE

        return polygon;
    },

    // 右键按下事件
    onRButtonDown: function (Flags, X, Y) {
        try {
            DrawPolygon.end();
        } catch (e) {
            console.error(e);
        }

        return true;
    },

    // 帧事件
    onFrame: function () {
        try {
            var _this = DrawPolygon;
            if (_this.polygon == null || _this.isEditing) {
                return;
            }

            var mi = _this.SG.Window.GetMouseInfo();
            if (mi.X < 0 || mi.Y < 0) {
                return;
            }

            var wpi = _this.SG.Window.PixelToWorld(mi.X, mi.Y, -1); // 0-Terrain
            wpi.Position.ChangeAltitudeType(3);
            if (wpi.Position.X == 0 || wpi.Position.Y == 0) {
                return;
            }

            var p = _this.polygon.Geometry.ExteriorRing.Points.Item(_this.polygon.Geometry.ExteriorRing.Points.Count - 1);
            p.X = wpi.Position.X;
            p.Y = wpi.Position.Y;
            p.Z = wpi.Position.Altitude;
        } catch (e) {
            console.error(e);
        }
    },

    // 结束
    end: function () {
        this.rmEvent();
        if (this.polygon) {
            if (this.polygon.Geometry.ExteriorRing.Points.Count < 5) {
                this.polygon.Geometry.EndEdit();
                this.SG.ProjectTree.DeleteItem(this.polygon.ID);
                this.polygon = null;
            } else {
                this.polygon.Geometry.ExteriorRing.Points.DeletePoint(1);
                this.polygon.Geometry.ExteriorRing.Points.DeletePoint(this.polygon.Geometry.ExteriorRing.Points.Count - 1);
                this.polygon.Geometry.EndEdit();
            }
        }

        //this.SG.ProjectTree.EndEdit();
        this.SG.Window.SetInputMode(0);
        this.isEditing = false;
        this.isDrawing = false;

        if (this.callback) {
            this.callback(this.polygon);
        }
    }
};