void init()
{
p = new Pen(Color.Red, 2);
draw_cutter = new graphics();
gr = pictureBox1.CreateGraphics();
x = -1;
y = -1;
mov = false;
}
// end
void reset()
{
g = null;
p = null;
gr = null;
draw_cutter = null;
ok = false;
mov = false;
constructed = false;
}