sgworld.OnRButtonUp += Sgworld_OnRButtonUp;//綁定鼠標右擊抬起事件
 sgworld.OnLButtonUp += Sgworld_OnLButtonUp;//綁定鼠標左擊抬起事件
 sgworld.OnLButtonDown += Sgworld_OnLButtonDown;//綁定鼠標左擊按下事件
 sgworld.OnFrame += Sgworld_OnFrame;//綁定實時渲染事件
 

using System;
using System.Windows.Forms;
using TerraExplorerX;//引用Skyline的名稱空間

namespace Skyline畫線
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }
  //全局變量
  SGWorld701 sgworld;
  bool Drawline = false;
  double centerX = 0;
  double centerY = 0;
  ITerrainPolyline701 polyline = null;

  //畫直線按鈕 按鈕的Name為 Drawaline
  private void Drawaline_Click(object sender, EventArgs e)
  {
   Drawline = true;
  }
  //窗體加載
  private void Form1_Load(object sender, EventArgs e)
  {
   sgworld = new SGWorld701();
   sgworld.Project.Open("工程路徑");
   sgworld.OnRButtonUp += Sgworld_OnRButtonUp;//綁定鼠標右擊抬起事件
   sgworld.OnLButtonUp += Sgworld_OnLButtonUp;//綁定鼠標左擊抬起事件
   sgworld.OnLButtonDown += Sgworld_OnLButtonDown;//綁定鼠標左擊按下事件
   sgworld.OnFrame += Sgworld_OnFrame;//綁定實時渲染事件
  }
  
  //鼠標左擊按下事件 獲取屏幕中心點位置
  private bool Sgworld_OnLButtonDown(int Flags, int X, int Y)
  {
   IWorldPointInfo701 centerOfWorld1 = sgworld.Window.CenterPixelToWorld(WorldPointType.WPT_DEFAULT);
   centerX = centerOfWorld1.Position.X;

   centerY = centerOfWorld1.Position.Y;
   return false;
  }
  //實時渲染事件 
  private void Sgworld_OnFrame()
  {
   IMouseInfo701 mouse1= sgworld.Window.GetMouseInfo();
   IWorldPointInfo701 worldPointInfo = sgworld.Window.PixelToWorld(mouse1.X, mouse1.Y);
   if (worldPointInfo != null)
   {
    IPosition701 pos = worldPointInfo.Position;
    if (polyline!=null)
    {
     polyline.Geometry.StartEdit();
     ((ILineString)polyline.Geometry).Points.DeletePoint(
      ((ILineString)polyline.Geometry).Points.Count - 1
      );
     ((ILineString)polyline.Geometry).Points.AddPoint(
      worldPointInfo.Position.X,
      worldPointInfo.Position.Y,
      worldPointInfo.Position.Altitude
      );
     polyline.Geometry.EndEdit();

    }
   }
  }


  //鼠標右擊彈起事件 
  private bool Sgworld_OnLButtonUp(int Flags, int X, int Y)
  {

   IWorldPointInfo701 centerOfWorld2 = sgworld.Window.CenterPixelToWorld(WorldPointType.WPT_DEFAULT);
   double centerPointDistance = sgworld.CoordServices.GetDistance(centerOfWorld2.Position.X, centerOfWorld2.Position.Y, centerX, centerY);
   //判斷如果鼠標單擊畫線按鈕后執(zhí)行下面
   if (Drawline == true)
   {
    IWorldPointInfo701 ipWorldInfor = sgworld.Window.PixelToWorld(X, Y);
    if (polyline == null)
     {
      double dXCoord = ipWorldInfor.Position.X;
      double dYCoord = ipWorldInfor.Position.Y;
      double[] array = new double[] { };
      array = new double[] { dXCoord, dYCoord, 0, dXCoord, dYCoord, 0, };
      ILineString lr = sgworld.Creator.GeometryCreator.CreateLineStringGeometry(array);

      polyline = sgworld.Creator.CreatePolyline(lr, 0xffffff, AltitudeTypeCode.ATC_TERRAIN_ABSOLUTE, "", "");
     }
     else
     {
      if (centerPointDistance==0)
      {
      ILineString new_lr = polyline.Geometry as ILineString;
      new_lr.StartEdit();
      new_lr.Points.AddPoint(ipWorldInfor.Position.X, ipWorldInfor.Position.Y, ipWorldInfor.Position.Altitude);
      new_lr.EndEdit();

      }
     }
   }
   return false;
  }
  //鼠標右擊事件結束畫線，并刪除最后一個點
  private bool Sgworld_OnRButtonUp(int Flags, int X, int Y)
  {
   if (polyline != null)
   {
    polyline.Geometry.StartEdit();
    ((ILineString)polyline.Geometry).Points.DeletePoint(
        ((ILineString)polyline.Geometry).Points.Count - 1
        );
    polyline.Geometry.EndEdit();
   }
   
   Drawline = false;
   polyline = null;
   return true;
  }
 }
}