Micaps4二次开发(2)获取micaps主程序地图上鼠标位置

背景

micaps二次开发中,比较重要的功能就是和主程序地图进行交互。交互分为两种:

  • 向主程序地图区域添加元素;
  • 获取主程序地图区域信息;
    为了直观说明这个问题,这里给出micaps的主界面:


    二次开发交互示意图

    这里介绍一下,自己对获取主程序地图区域鼠标位置信息的理解 。

获取地图上鼠标位置

自定义一个交互的类 TyphoonPointSelectMapTool

 internal class TyphoonPointSelectMapTool : MapTool
    {
        private lyTyphoonPresenter _presenter;

        public TyphoonPointSelectMapTool(lyTyphoonPresenter presenter)
        {
            this._presenter = presenter;
        }

        public override void MouseDown(MouseButtonID button, int x, int y)
        {
            if (button == MouseButtonID.MB_Left)
            {
                this._presenter.OnMouseDown(button, x, y);
            }
        }

        public override void MouseMove(MouseButtonID button, int x, int y)
        {
            this._presenter.OnMouseMove(x, y);
        }

        public override void MouseUp(MouseButtonID button, int x, int y)
        {
            this._presenter.OnMouseUp(button, x, y);
        }

        public override void MouseWheel(MouseButtonID button, int delta)
        {
        }

        protected override void OnActionCompleted()
        {
        }

        public override void OnActive()
        {
        }

        public override void OnDeactive()
        {
        }
    }

自定义presenter类

 public void OnMouseUp(MouseButtonID button, int x, int y)
        {
            if (button == MouseButtonID.MB_Right)
                {
                    this._showTempPoint = false;
                    this.FreeTempPointResource();
                }
                else
                {
                    //左键是选择输入点
                    PointF point = this._presenter.ScrToGeography(x, y);
                    this._points.Add(point);
                    this._showTempPoint = true;
                }
                 this.DisplayPoint(true);
        }


至此,完成了获取主程序地图信息获取的功能编写
那么如何触发这个功能呢?

触发获取主程序地图信息功能

在二次开发界面上,触发需要获取主界面位置信息的按钮时,执行如下函数:

 bool active = checkBoxMouseSelect.Checked;
 if (active)
 {
   ServiceLocator.Current.GetInstance().DisableMapInputAction(CMA.MICAPS.Box2D.Input.InputActions.Pan);
 }
 else
 {
  ServiceLocator.Current.GetInstance().EnableMapInputAction(CMA.MICAPS.Box2D.Input.InputActions.Pan);
 }
this.SetTyphoonMapTool(this._typhoonMapTool, active);

子函数:

 private void SetTyphoonMapTool(IMouseInputHandler tool, bool register)
        {
            ToolAction action = register ? ((ToolAction)4) : ((ToolAction)5);
            MapToolMessage message = new MapToolMessage(action);
            message.CustomMouseHandler=tool;
            MapToolMessage[] messageArray1 = new MapToolMessage[] { message };
            ServiceLocator.Current.GetInstance().Publish(messageArray1);
        }

显示点到主程序地图上

获取鼠标点后,能够将点位置实时显示到地图上,则可以快速响应用户的点击信息,这是一个很好的交互方式。
如何显示,目前,我还没有找到画点的方式,查阅了很多资料,寻找到一种折中的办法,效果一般。具体实现如下:

 public void DisplayPoint(bool visible)
        {
            if (visible)
            {
                if (this._points.Count >0)
                {
                    this.FreePointResource();
                    DisplayTempPoint(_points[0]);
                   // 这里仅仅显示了一个点信息;
                }
            }
            else
            {
                this.FreePointResource();
                this.FreeTempPointResource();
            }
        }
 private void DisplayTempPoint(PointF point)
        {
            if ((this._points.Count != 0) && this._showTempPoint)
            {
                if (this._tempPoint == null)
                {
                    this._tempPoint = new PointRenderable(8f, Color.Red);
                    this._tempPoint.Add(point.X,point.Y);
                     Device.Instance.ActiveScene.AddRenderable(this._tempPoint.MeshRenderable);
                }
                else
                {
                    this._tempPoint.UpdatePostion(point.X, point.Y);
                }
            }
        }
 public IRenderable MeshRenderable
        {
            get
            {
                if (this._meshRenderable == null)
                {
                    this._meshRenderable = this.CreateMeshRenderable();
                }
                return this._meshRenderable;
            }
        }
  private CMA.MICAPS.Box2D.Graphics.MeshRenderable CreateMeshRenderable()
        {
            /*
             绘制点到micaps界面上,必须考虑投影的影响。vertebuffer中存储的是
             屏幕坐标,直接将经纬度放入,在屏幕中绘制出来的几乎不变
             添加经纬度转换后,则可以正确绘制。
             遗留问题:
             绘制出来的是方块,还不知道怎么修改
            */

            int num3;
            int count = this._points.Count;
            if (count == 0)
            {
                return null;
            }
            Mesh mesh = new Mesh();
            mesh.MeshBuffer=new MeshBuffer();
            MeshPart part = new MeshPart(0L);
            mesh.AddPart(part);
            Material2D materiald = new Material2D();
            materiald.SurfaceState.point_size = _size;//.get_SurfaceState().point_size = this._size;
            materiald.BackColor = _color;//.set_BackColor(this._color);
            materiald.ForeColor = _color;
            mesh.SetMaterial(materiald);
            double num;
            double num2;           
            IMapProjection projection = ServiceLocator.Current.GetInstance().CurrentMap.Projection;
           

            for (int i = 0; i < count; i = num3 + 1)
            {
                PointF tf = this._points[i];
                projection.FwdP((double)tf.X, (double)tf.Y, out num, out num2);

                mesh.MeshBuffer.VertexBuffer.AppendFloat((float)num);
                mesh.MeshBuffer.VertexBuffer.AppendFloat((float)num2);
                num3 = i;
            }
            BufferOpInfo info = new BufferOpInfo
            {
                offset = 0,
                count = count,
                mode = 0
            };

            info.mode = 0;
            part.BufferOpInfo=info;
            return new CMA.MICAPS.Box2D.Graphics.MeshRenderable(mesh);
        }

        public void UpdatePostion(float worldx, float worldy)
        {
            double num;
            double num2;
            IMapProjection projection = ServiceLocator.Current.GetInstance().CurrentMap.Projection;
            projection.FwdP((double)worldx, (double)worldy, out num, out num2);

            VertexBuffer buffer = this._meshRenderable.Mesh.MeshBuffer.VertexBuffer;// ().MeshBuffer.VertexBuffer;
            IntPtr destination = buffer.Lock();
            float[] source = new float[] {(float) num, (float)num2 };
            Marshal.Copy(source, 0, destination, 2);
            buffer.Unlock();
            this._meshRenderable.RefreshVertexBuffer();
        }

这里需要强调一下,地图具有投影信息,要注意地理坐标和屏幕坐标的转换,转换用如下:

 IMapProjection projection = ServiceLocator.Current.GetInstance().CurrentMap.Projection;
  projection.FwdP((double)tf.X, (double)tf.Y, out num, out num2);

最初没有注意这个问题,鼠标所选的点在屏幕上基本上没有改变,困扰了很久。
以上是实现的主要函数。

效果如下:

效果图

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