Constants
HALF_PI: PI / 2.0THIRD_PI: PI / 3.0PI: PI (3.14159...)TWO_PI: PI * 2.0QUARTER_PI: PI / 4.0DEG_TO_RAD: PI / 180RAD_TO_REG: 180 / PI
HALF_PI : PI / 2.0THIRD_PI : PI / 3.0PI : PI (3.14159...)TWO_PI : PI * 2.0QUARTER_PI : PI / 4.0DEG_TO_RAD : PI / 180RAD_TO_REG : 180 / PI