protected double[] computeAngles() {
// Compute the start and sweep angles such that the partial cylinder shape tranverses a
// clockwise path from
// the start angle to the stop angle.
Angle startAngle, stopAngle, sweepAngle;
startAngle = normalizedAzimuth(this.leftAzimuth);
stopAngle = normalizedAzimuth(this.rightAzimuth);
int i = startAngle.compareTo(stopAngle);
// Angles are equal, fallback to building a closed cylinder.
if (i == 0) return null;
if (i < 0) sweepAngle = stopAngle.subtract(startAngle);
else // (i > 0)
sweepAngle = Angle.POS360.subtract(startAngle).add(stopAngle);
double[] array = new double[3];
array[0] = startAngle.radians;
array[1] = stopAngle.radians;
array[2] = sweepAngle.radians;
return array;
}
