SharpMap + ZedGraph 饼图实例，可生成各种统计图
//Set visible map extents
map.Center = new SharpMap.Geometries.Point(centerX, centerY);
map.Zoom = Zoom;
//Generate map
System.Drawing.Bitmap img = (System.Drawing.Bitmap)map.GetMap();
//Stream the image to the client
context.Response.ContentType = "image/png";
System.IO.MemoryStream MS = new System.IO.MemoryStream();
img.Save(MS, System.Drawing.Imaging.ImageFormat.Png);
// tidy up
img.Dispose();
byte[] buffer = MS.ToArray();
context.Response.OutputStream.Write(buffer, 0, buffer.Length);
public SharpMap.Styles.VectorStyle GetChartingStyle(SharpMap.Data.FeatureDataRow row)
{
SharpMap.Styles.VectorStyle style = new SharpMap.Styles.VectorStyle();
int numMale = int.Parse(row["male"].ToString());
int numFemale = int.Parse(row["female"].ToString());
style.Symbol = this.GetChart(numMale, numFemale);
return style;
}
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