private void AddRandomArrows()
{
double x0, y0, x1, y1;
arrowSeries1.Clear();
for (int t = 1; t < 40; t++)
{
x0 = r.Next(1000);
y0 = r.Next(1000);
x1 = r.Next(300) - 150;
if (x1 < 50)
{
x1 = 50;
}
x1 += x0;
y1 = r.Next(300) - 150;
if (y1 < 50)
{
y1 = 50;
}
y1 += y0;
arrowSeries1.Add(x0, y0, x1, y1);
}
}