//Добавить прямоугольник
public void AddRect(Point up, Point down)
{
sRect rect = new sRect(GetDeleateContainer(), up, down);
shapelist.Add(rect);
rect.Draw();
SynchronizeImage();
}
//Рисует временный прямоугольник средствами gdi32
public void TempRect(Point a, Point b)
{
IntPtr hdc = NativeMethods.GetDC(cnv.Handle);
sRect Rect;
Rectangle rect;
NativeMethods.SetROP2(hdc, NativeMethods.R2_NOT);
NativeMethods.SelectObject(hdc, NativeMethods.GetStockObject(NativeMethods.HOLLOW_BRUSH));
if ((oldb.X != int.MinValue) & (oldb.Y != int.MinValue))
{
Rect = new sRect(GetDeleateContainer(), a, oldb);
rect = Rect.GetRect();
NativeMethods.Rectangle(hdc, rect.X, rect.Y, rect.Width, rect.Height);
}
Rect = new sRect(GetDeleateContainer(), a, b);
rect = Rect.GetRect();
NativeMethods.Rectangle(hdc, rect.X, rect.Y, rect.Width, rect.Height);
oldb = b;
NativeMethods.ReleaseDC(cnv.Handle, hdc);
}