BackErase example for C++ Builder

This example turns off repainting of the background, and then zooms out to show the effect when repainting.

   LEADRasterView1->BackErase = False;
   LEADRasterView1->AutoRepaint = False;
   LEADRasterView1->AutoScroll = False;
   //Calculate the values to zoom out by 10 percent and center the image
   LEADRasterView1->DstWidth = LEADRasterView1->DstWidth * 0.9;
   LEADRasterView1->DstHeight = LEADRasterView1->DstHeight * 0.9;
   LEADRasterView1->DstTop = (LEADRasterView1->ScaleHeight - LEADRasterView1->DstHeight) / 2;
   LEADRasterView1->DstLeft = (LEADRasterView1->ScaleWidth - LEADRasterView1->DstWidth) / 2;
   //Set the clipping area to the same as the destination rectangle
   LEADRasterView1->DstClipWidth = LEADRasterView1->DstWidth;
   LEADRasterView1->DstClipHeight = LEADRasterView1->DstHeight;
   LEADRasterView1->DstClipTop = LEADRasterView1->DstTop;
   LEADRasterView1->DstClipLeft = LEADRasterView1->DstLeft;
   //Redisplay the image
   LEADRasterView1->ForceRepaint ( );