ios - Draw an image once and then draw on it with finger (MonoTouch) -

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i can draw picture , draw finger on following code:

public override void draw (rectanglef rect)     {         base.draw (rect);              using (cgcontext context = uigraphics.getcurrentcontext()) {                  // draw image in context                 context.drawimage (rectangle, imagetodraw.cgimage);                    // draw finger touch                 if (this.fingerdraw) {                      context.setstrokecolor (uicolor.black.cgcolor);                     context.setlinewidth (5f);                 context.setlinecap (cglinecap.round);                      this.drawpath.movetopoint (this.prevtouchlocation);                     this.drawpath.addlinetopoint (this.touchlocation);                     context.addpath (this.drawpath);                     context.drawpath (cgpathdrawingmode.stroke);                  }             }       }

however brings me performance problems, expensive draw image every time user touches screen.

how can draw image once @ beginning , draw finger touch?

don't draw on image. put image in view that's underneath fingerdraw view.


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