/// <summary>
/// generate the bitmap of a region
/// </summary>
/// <param name="bbox">requested rendering boundary</param>
/// <param name="height">height of the bitmap</param>
/// <param name="width">width of the bitmap</param>
/// <returns></returns>
public Bitmap generateMapRegionImg()
{
Bitmap mapRegionImg = new Bitmap(MapRegionImg.Width, MapRegionImg.Height);
try
{
int width = MapRegionImg.Width;
int height = MapRegionImg.Height;
Graphics gf = Graphics.FromImage((Image)mapRegionImg);
List <Bitmap> layerBatches = new List <Bitmap>();
if (m_hasTerrainLyr)
{
layerBatches.Add(m_terrainLyr.render(MapRegionBBox, width, height, Elevation));
}
if (m_hasObjLyr)
{
layerBatches.Add(m_objLyr.render(MapRegionBBox, width, height, Elevation));
}
if (m_hasAgentLyr)
{
layerBatches.Add(m_agentLyr.render(MapRegionBBox, width, height, Elevation));
}
for (int i = 0; i < layerBatches.Count; i++)
{
gf.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.GammaCorrected;
//determine the overwrite mode
gf.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver;
gf.DrawImage(layerBatches[i], new Rectangle(0, 0, width, height));
layerBatches[i].Dispose();
}
gf.Dispose();
}
catch (Exception e)
{
throw new Exception("generate map region image failed, " + e.Message);
}
MapRegionImg.MapRegionBmp = mapRegionImg;
return(mapRegionImg);
}