[WorldWind学习]20.修改ShapeFileLayer类及托管D3D文字绘制方法

PluginSDK\ShapeFileLayer.cs Line:1027
char[] fieldDataChars = dbfReader.ReadChars(fieldHeaders[j].FieldLength);
string fieldData = new string( fieldDataChars );
为
byte[] fieldDataChars = dbfReader.ReadBytes(fieldHeaders[j].FieldLength);
string fieldData = System.Text.Encoding.Default.GetString( fieldDataChars );

 if(m_LabelList.Count > )
 {
     System.Drawing.Color iconColor = System.Drawing.Color.FromArgb(m_IconOpacity, , , );
     foreach(Shapefile_Point p in m_LabelList)
     {
         Vector3 cartesianPoint = MathEngine.SphericalToCartesian(p.Y, p.X, drawArgs.WorldCamera.WorldRadius + drawArgs.WorldCamera.TerrainElevation);
         if(!drawArgs.WorldCamera.ViewFrustum.ContainsPoint(cartesianPoint) ||MathEngine.SphericalDistanceDegrees(p.Y, p.X, drawArgs.WorldCamera.Latitude.Degrees, drawArgs.WorldCamera.Longitude.Degrees) > 90.0)
         continue;
         Vector3 projectedPoint = drawArgs.WorldCamera.Project(cartesianPoint - referenceCenter);

         m_Sprite.Begin(SpriteFlags.AlphaBlend);
         if(m_IconTexture != null)
         {
             float xscale = (float)m_IconWidth / m_IconTextureDescription.Width;
             float yscale = (float)m_IconHeight / m_IconTextureDescription.Height;
             m_Sprite.Transform = Matrix.Scaling(xscale,yscale,);
             m_Sprite.Transform *= Matrix.Translation(projectedPoint.X, projectedPoint.Y, );
             m_Sprite.Draw( m_IconTexture,
                 new Vector3( m_IconWidth>>, m_IconHeight>>,),
                 Vector3.Empty,
                 iconColor.ToArgb() );

             // Reset transform to prepare for text rendering later
             m_Sprite.Transform = Matrix.Identity;
         }

         if(m_ShapeTileArgs.ShowLabels && m_ShapeTileArgs.DataKey != null)
         {
             // Render label
             if(p.Tag != null)
             {
                 // Render name field
                 const int labelWidth = ; // Dummy value needed for centering the text
                 if(m_IconTexture==null)
                 {
                     // Center over target as we have no bitmap
                     Rectangle rect = new Rectangle(
                         (int)projectedPoint.X - (labelWidth>>),
                         (int)(projectedPoint.Y - (drawArgs.defaultDrawingFont.Description.Height >> )),
                         labelWidth,
                         drawArgs.screenHeight );

                     drawArgs.defaultDrawingFont.DrawText(m_Sprite, p.Tag.ToString(), rect, DrawTextFormat.Center, m_ShapeTileArgs.LabelColor);
                 }
                 else
                 {
                     // Adjust text to make room for icon
                     int spacing = (int)(m_IconWidth * 0.3f);
                     if(spacing>)
                         spacing = ;
                     int offsetForIcon = (m_IconWidth>>) + spacing;

                     Rectangle rect = new Rectangle(
                         (int)projectedPoint.X + offsetForIcon,
                         (int)(projectedPoint.Y - (drawArgs.defaultDrawingFont.Description.Height >> )),
                         labelWidth,
                         drawArgs.screenHeight );

                     drawArgs.defaultDrawingFont.DrawText(m_Sprite, p.Tag.ToString(), rect, DrawTextFormat.WordBreak, m_ShapeTileArgs.LabelColor);
                 }
             }
         }
         m_Sprite.End();
     }
 }

有一个文字3D世界坐标点投影到屏幕的过程，在屏幕绘制。