[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 );

 

 1 if(m_LabelList.Count > 0)
 2 {
 3     System.Drawing.Color iconColor = System.Drawing.Color.FromArgb(m_IconOpacity, 255, 255, 255);
 4     foreach(Shapefile_Point p in m_LabelList)
 5     {
 6         Vector3 cartesianPoint = MathEngine.SphericalToCartesian(p.Y, p.X, drawArgs.WorldCamera.WorldRadius + drawArgs.WorldCamera.TerrainElevation);
 7         if(!drawArgs.WorldCamera.ViewFrustum.ContainsPoint(cartesianPoint) ||MathEngine.SphericalDistanceDegrees(p.Y, p.X, drawArgs.WorldCamera.Latitude.Degrees, drawArgs.WorldCamera.Longitude.Degrees) > 90.0)
 8         continue;
 9         Vector3 projectedPoint = drawArgs.WorldCamera.Project(cartesianPoint - referenceCenter);
10         
11         m_Sprite.Begin(SpriteFlags.AlphaBlend);
12         if(m_IconTexture != null)
13         {
14             float xscale = (float)m_IconWidth / m_IconTextureDescription.Width;
15             float yscale = (float)m_IconHeight / m_IconTextureDescription.Height;
16             m_Sprite.Transform = Matrix.Scaling(xscale,yscale,0);
17             m_Sprite.Transform *= Matrix.Translation(projectedPoint.X, projectedPoint.Y, 0);
18             m_Sprite.Draw( m_IconTexture,
19                 new Vector3( m_IconWidth>>1, m_IconHeight>>1,0),
20                 Vector3.Empty,
21                 iconColor.ToArgb() );
22 
23             // Reset transform to prepare for text rendering later
24             m_Sprite.Transform = Matrix.Identity;
25         }
26 
27         if(m_ShapeTileArgs.ShowLabels && m_ShapeTileArgs.DataKey != null)
28         {    
29             // Render label
30             if(p.Tag != null)
31             {
32                 // Render name field
33                 const int labelWidth = 1000; // Dummy value needed for centering the text
34                 if(m_IconTexture==null)
35                 {
36                     // Center over target as we have no bitmap
37                     Rectangle rect = new Rectangle(
38                         (int)projectedPoint.X - (labelWidth>>1), 
39                         (int)(projectedPoint.Y - (drawArgs.defaultDrawingFont.Description.Height >> 1)),
40                         labelWidth, 
41                         drawArgs.screenHeight );
42 
43                     drawArgs.defaultDrawingFont.DrawText(m_Sprite, p.Tag.ToString(), rect, DrawTextFormat.Center, m_ShapeTileArgs.LabelColor);
44                 }
45                 else
46                 {
47                     // Adjust text to make room for icon
48                     int spacing = (int)(m_IconWidth * 0.3f);
49                     if(spacing>10)
50                         spacing = 10;
51                     int offsetForIcon = (m_IconWidth>>1) + spacing;
52 
53                     Rectangle rect = new Rectangle(
54                         (int)projectedPoint.X + offsetForIcon, 
55                         (int)(projectedPoint.Y - (drawArgs.defaultDrawingFont.Description.Height >> 1)),
56                         labelWidth, 
57                         drawArgs.screenHeight );
58 
59                     drawArgs.defaultDrawingFont.DrawText(m_Sprite, p.Tag.ToString(), rect, DrawTextFormat.WordBreak, m_ShapeTileArgs.LabelColor);
60                 }
61             }
62         }        
63         m_Sprite.End();
64     }
65 }

有一个文字3D世界坐标点投影到屏幕的过程，在屏幕绘制。

 

posted @ 2013-10-19 09:59  太一吾鱼水  阅读(456)  评论(0)  编辑  收藏  举报