本参考资料用于Processing 3.0+。 如果你使用的是前一版本，请在使用软件帮助菜单内的参考资料。. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Core Javadoc and Libraries Javadoc.
|描述||HALF_PI is a mathematical constant with the value 1.5707964. It is half the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions sin() and cos().|
Updated on October 2, 2018 05:02:10pm EDT