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

Offline 鑫杨 over 5 years ago

类似这种效果

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Offline Yongan.Fu Thu, Aug 30 2018 9:04 PM +2 verified

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…
Offline Yongan.Fu Wed, Jan 9 2019 3:43 AM in reply to Xiaowei.Li +2

为何要“频繁清空panel，然后add新的 ElemPreviewContrel实例 ”？保持同一个Panel，只需要改变Element往同一个Panel上显示即可。

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+1 Offline Yongan.Fu Thu, Aug 30 2018 9:04 PM

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。

Answer Verified By: 鑫杨

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