CAD——生成图片

dukeyongwang · 发表于 2009-11-25 10:26:00

在『Kean』的BlockView.NET中有生成图片的功能，拷贝一个View,然后调用RenderToImage()方法，可是为什么总是提示【对象的当前状态使该操作无效】，请大家帮帮忙？
  private void OutputImageMenuItem_Click(object sender, EventArgs e)
{
   // pick the place where o output the image type
   Autodesk..Windows.SaveFileDialog dialog = new Autodesk.AutoCAD.Windows.SaveFileDialog("RenderToImage", null, "jpg;png;tif;bmp", "BlockViewSnapshotBrowseDialog", Autodesk.AutoCAD.Windows.SaveFileDialog.SaveFileDialogFlags.AllowAnyExtension);
   // if all is ok?
   if (DialogResult.OK == dialog.ShowDialog())
   {
      // create an offscreen device
      using (Device device = new Device())
      {
      // get the size of the GS view
      Size size = mPreviewCtrl.ClientRectangle.Size;
      // resize the device to this
      device.OnSize(size);
      device.BackgroundColor = Color.Black;
      device.SetLogicalPalette(GSUtil.MyAcadColorMs);
      device.OnRealizeBackgroundPalette();
      device.OnRealizeForegroundPalette();

      // make a copy of the gs view
      using (Autodesk.AutoCAD.GraphicsSystem.View view = mPreviewCtrl.mpView.Clone(true, true))
      {
         try
         {
            // add it to the device
            device.Add(view);
            // now render the image to a bitmap
            using (System.Drawing.Bitmap bitmap = view.RenderToImage())
            {
            // now save it out!!
            bitmap.Save(dialog.Filename);
            }
         }
         finally
         {
            // do a clear up
            device.EraseAll();
         }
      }
      }
   }
}