// clockwise detection: https://stackoverflow.com/questions/1165647/how-to-determine-if-a-list-of-polygon-points-are-in-clockwise-order
private void addPathPoints(SvgParser.SvgPath path)
{
pathPoints = new List <Vector2f>(path.npts);
float shoeLaceSum = 0f;
Vector2f v, vNext;
for (int i = 0; i < path.npts; ++i)
{
v = PathToVector.PointAt(path, i);
vNext = PathToVector.PointAt(path, (i + 1) % path.npts);
shoeLaceSum += (vNext.x - v.x) * (vNext.y + v.y);
pathPoints.Add(v);
average += v;
}
area = Math.Abs(shoeLaceSum) / 2f;
isClockwiseOrdered = (shoeLaceSum > 0f) != isYAxisInverted;
average /= path.npts;
}
public void display(SvgParser.SvgPath path)
{
displayPoints(PathToVector.GetPointList(path));
}
