如何使用C#Winfrom实现Skyline画直线功能
1、画线的逻辑：
让我回到TerraExplorer Pro这个软件中尝试画一条线，从每一步操作去发现，到底发生了什么？1.鼠标左键在3D窗口中选择一个点（确定第一个点的位置）。2.挪动鼠标，在第二个点单击鼠标左键（确定第二个点的位置）。3.按住鼠标左键不放，在3D窗口中挪动地球，松开后发现没有画出线，这时左键单击下一个点又画了一个线。(左键选中拖拽不画线)4.右键单击取消最后一个点，将上一个点定为线最后的终点（删除最后一个点位，将倒数第二个点定为线的终点）
尝试自己去画一条线很重要，在画完之后上面这些话你会多少理解一些。
2、画线的代码
下面是需要绑定的事件，这个代码有个小Bug等待你自己去发现
sgworld.OnRButtonUp += Sgworld_OnRButtonUp;//绑定鼠标右击抬起事件 sgworld.OnLButtonUp += Sgworld_OnLButtonUp;//绑定鼠标左击抬起事件 sgworld.OnLButtonDown += Sgworld_OnLButtonDown;//绑定鼠标左击按下事件 sgworld.OnFrame += Sgworld_OnFrame;//绑定实时渲染事件
using System;using System.Windows.Forms;using TerraExplorerX;//引用Skyline的名称空间namespace Skyline画线{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } //全局变量 SGWorld701 sgworld; bool Drawline = false; double centerX = 0; double centerY = 0; ITerrainPolyline701 polyline = null; //画直线按钮 按钮的Name为 Drawaline private void Drawaline_Click(object sender, EventArgs e) { Drawline = true; } //窗体加载 private void Form1_Load(object sender, EventArgs e) { sgworld = new SGWorld701(); sgworld.Project.Open("工程路径"); sgworld.OnRButtonUp += Sgworld_OnRButtonUp;//绑定鼠标右击抬起事件 sgworld.OnLButtonUp += Sgworld_OnLButtonUp;//绑定鼠标左击抬起事件 sgworld.OnLButtonDown += Sgworld_OnLButtonDown;//绑定鼠标左击按下事件 sgworld.OnFrame += Sgworld_OnFrame;//绑定实时渲染事件 } //鼠标左击按下事件 获取屏幕中心点位置 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; } //实时渲染事件 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(); } } } //鼠标右击弹起事件 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); //判断如果鼠标单击画线按钮后执行下面 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; } //鼠标右击事件结束画线，并删除最后一个点 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; } }}
由于时间比较紧，本来想一点点分析详解的，大家可以做参考，也可直接复制，但是最重要的是理解，一个东西理解了才能更好的学习。有什么想法大家可以一起讨论学习。