[MSCE C#] 如何在WPF或者在WINFORM中显示一个microstation cell的三维几何图形？

Question

类似这种效果

Yongan.Fu · Accepted Answer

1. 将如下代码保存为MyElementPreviewControl.cs 
 using System;
using System.Drawing;
using System.Runtime.InteropServices;
using Bentley.GeometryNET;
using Bentley.DgnPlatformNET;
using Bentley.DgnPlatformNET.Elements;
using Bentley.MstnPlatformNET.WinForms.Controls;
using System.Windows.Forms;

namespace MSAppNET
{
 public class MyElementPreviewControl : ElementPreview
 {
 private DisplayableElement m_elem;
 private MSRenderMode m_renderMode;
 public MyElementPreviewControl(ref DisplayableElement elem, MSRenderMode renderMode)
 {
 m_elem = elem;
 m_renderMode = renderMode;
 }
 protected override void OnPaint(PaintEventArgs e)
 {
 base.OnPaint(e);

 ViewFlags myViewFlags = ViewInformation.GetDefaultFlags();
 myViewFlags.Camera = false;
 myViewFlags.RenderMode = (int)m_renderMode;
 myViewFlags.Grid = false;
 DRange3d elemRng;
 m_elem.CalcElementRange(out elemRng);
 DPoint3d myOrg = elemRng.Low;
 DPoint3d myRng = DPoint3d.Subtract(elemRng.High, elemRng.Low);
 Rectangle myRect = new Rectangle(Location, Size);
 DisplayElemHandle(BytesToIntptr(m_elem.ElementHandle), myViewFlags, myRect, null, myOrg, myRng);
 }
 public static IntPtr BytesToIntptr(byte[] bytes)
 {
 int size = bytes.Length;
 IntPtr buffer = Marshal.AllocHGlobal(size);
 Marshal.Copy(bytes, 0, buffer, size);
 return buffer;
 }
 }
}
 
 2. 在你的Winform中添加一个Panel控件； 
 3. 在你的WinForm.cs中大致如下写： 
 public partial class MstnControlsForm : //Bentley.MstnPlatformNET.WinForms.Adapter
 System.Windows.Forms.Form
 {
 private MyElementPreviewControl myElemPreview;

 public MstnControlsForm()
 {
 InitializeComponent();

 DgnModel dgnModel = Session.Instance.GetActiveDgnModel();
 DPoint3d[] pts = { new DPoint3d(0, 0, 0), new DPoint3d(1000, 1000,0),
 new DPoint3d(2000, -1000,0), new DPoint3d(3000, 0, 0)};
 DVector3d sTangent = DVector3d.FromXY(1000, 1000);
 DVector3d eTangent = DVector3d.FromXY(2000 - 3000, -1000);
 MSBsplineCurve curve = MSBsplineCurve.CreateFromInterpolatePoints(pts, 3, true, ref sTangent, ref eTangent, true, 3);
 DisplayableElement myElem = new BSplineCurveElement(dgnModel, null, curve);
 //DisplayableElement myElem = dgnModel.FindElementById((ElementId)6645L) as DisplayableElement;
 if (null == myElem)
 {
 MessageCenter.Instance.ShowErrorMessage("myElem is invalid", null, true);
 return;
 }
 myElemPreview = new MyElementPreviewControl(ref myElem, MSRenderMode.Wireframe);
 myElemPreview.Dock = DockStyle.Fill;
 this.panel1.Controls.Add(myElemPreview);
 } 
 4. 当然，我这里是在代码中临时创建的一个元素，你可以将Cell读入到元素中带入即可。 
 5. MyElementPreviewControl仅仅演示了TopView的显示情况，你可以改造传入合适的RotMatrix。

[MSCE C#] 如何在WPF或者在WINFORM中显示一个microstation cell的三维几何图形？

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