void RecalcScrolls()
{
Point sz = graph.GetRealGraphSize();
Size cs = ClientSize;
hScrollBar.Maximum = (sz.X+1) * graph.cellsize;
vScrollBar.Maximum = (sz.Y+1) * graph.cellsize;
hScrollBar.Visible = (hScrollBar.Maximum > cs.Width || hScrollBar.Value > 0);
vScrollBar.Visible = (vScrollBar.Maximum > cs.Height || vScrollBar.Value > 0);
hScrollBar.LargeChange = hScrollBar.Maximum / 10;
hScrollBar.SmallChange = hScrollBar.Maximum / 20;
vScrollBar.LargeChange = vScrollBar.Maximum / 10;
vScrollBar.SmallChange = vScrollBar.Maximum / 20;
}
