C # drawing flashes

Http://www.cnblogs.com/Cybean/archive/2012/01/12/2321014.html

 

Other methods:

The contents of the element control are divided into two parts: frequent refresh and rarely refresh.

Add picturebox to the control, save the rarely refreshed part as a bitmap in the memory, and then display it in picturebox.

 
Bitmap BMP = profilebitmap (This. _ Lilines, toltallength );This. Picturebox1.image = BMPAsImage;
 

         Public Bitmap profilebitmap (list <profileline> li_lines, Double  Linelength) {bitmap BMP = New Bitmap (800 , 600  ); Graphics g = Graphics. fromimage (BMP); drawaxis (g );  For ( Int I = 0 ; I <= This . _ Lilines. Count- 1 ; I ++) //  Draw wired  {Drawoneprofileline (G, li_lines [I]);} drawgraduationx (G, linelength ); //  Add horizontal axis Scale Drawlengenditems (G, li_lines ); //  Add legend              Return  BMP ;}