Constructs a null point array. Constructs a shallow copy of the point array a. Constructs a point array with nPoints points, taken from the points array. Constructs a point array with room for size points. For internal use only.
Positive values mean counter-clockwise while negative values mean clockwise direction.
Zero degrees is at the 3'o clock position. The resulting array has sufficient resolution for pixel accuracy. Positive values mean counter-clockwise while negative values mean clockwise direction. Zero degrees is at the 3'o clock position. Assigns a shallow copy of a to this point array and returns a reference to this point array.