如何建一个图，并改变颜色？

• 回答：

  var layerId = mxOcx.AddLayer("断面图");
      var database = mxOcx.GetDatabase();
      var layer = database.ObjectIdToObject(layerId);
      //layer.Color.SetRGB(255,0,0);
  
      var newColor = layer.Color;
      newColor.SetRGB(255,0,0);
  
      layer.Color = newColor;
  
      mxOcx.LayerName = "断面图";
      mxOcx.DrawCADColorIndex = 256;
      mxOcx.DrawText(0,0,"文字内容字符串",8.0,0.0,1,3);