public void ResizeAndRedraw()
{
if (fig == null)
{
return;
}
fig.Resize(pictureBox1.Width, pictureBox1.Height);
fig.FrameRedraw();
fig.PlotLines(Xs, Ys, 1, Color.Red);
fig.PlotScatter(Xs, Ys, 5, Color.Blue);
pictureBox1.Image = fig.Render();
}