public void DrawPolygon(int[] xPoints, int[] yPoints, int nPoints)
{
int right = FindBiggest(xPoints);
int bottom = FindBiggest(yPoints);
int left = FindSmallest(xPoints);
int top = FindSmallest(yPoints);
HSSFPolygon shape = escherGroup.CreatePolygon(new HSSFChildAnchor(left, top, right, bottom));
shape.SetPolygonDrawArea(right - left, bottom - top);
shape.SetPoints(AddToAll(xPoints, -left), AddToAll(yPoints, -top));
shape.SetLineStyleColor(foreground.R, foreground.G, foreground.B);
shape.LineWidth = (0);
shape.IsNoFill = (true);
}