private void ProcessPan(MouseEventArgs args)
{
if (ClientRectangle.Contains(args.X, args.Y))
{
if (args.Button == System.Windows.Forms.MouseButtons.Left)
{
double dx = (double)(args.X - mouseDownPoint.X);
double dy = (double)(args.Y - mouseDownPoint.Y);
dx /= gViewer.LocalScale;
dy /= gViewer.LocalScale; //map it to real coord
int dh = gViewer.ScaleFromSrcXToScroll(dx);
int dv = gViewer.ScaleFromSrcYToScroll(dy);
gViewer.HVal = mouseDownHVal - dh;
gViewer.VVal = mouseDownVVal + dv;
gViewer.Invalidate();
}
else
{
GViewer.Hit(args);
}
}
}