bool GetArrowHead(On2dVector dir, On2dPoint tip, double scale, ref On3dPointArray triangle)
{
double arrow_size = m_default_arrow_size * scale;
On2dPointArray corners = new On2dPointArray();
corners.Reserve(3);
corners.SetCount(3);
On2dVector up = new On2dVector(-dir.y, dir.x);
corners[0].Set(tip.x, tip.y);
corners[1].x = tip.x + arrow_size * (0.25 * up.x - dir.x);
corners[1].y = tip.y + arrow_size * (0.25 * up.y - dir.y);
corners[2].x = corners[1].x - 0.5 * arrow_size * up.x;
corners[2].y = corners[1].y - 0.5 * arrow_size * up.y;
triangle.Reserve(corners.Count());
triangle.SetCount(corners.Count());
for (int i = 0; i < corners.Count(); i++)
{
triangle[i] = m_plane.PointAt(corners[i].x, corners[i].y);
}
return(true);
}
bool GetArrowHead(On2dVector dir, On2dPoint tip, double scale, ref On3dPointArray triangle)
{
double arrow_size = m_default_arrow_size * scale;
On2dPointArray corners = new On2dPointArray();
corners.Reserve(3);
corners.SetCount(3);
On2dVector up = new On2dVector(-dir.y, dir.x);
corners[0].Set(tip.x, tip.y);
corners[1].x = tip.x + arrow_size * (0.25 * up.x - dir.x);
corners[1].y = tip.y + arrow_size * (0.25 * up.y - dir.y);
corners[2].x = corners[1].x - 0.5 * arrow_size * up.x;
corners[2].y = corners[1].y - 0.5 * arrow_size * up.y;
triangle.Reserve(corners.Count());
triangle.SetCount(corners.Count());
for (int i = 0; i < corners.Count(); i++)
triangle[i] = m_plane.PointAt(corners[i].x, corners[i].y);
return true;
}
