Class MathUtils

src/com/cloudream/ishow/util/MathUtils.java:15–219

A class that contains utility methods related to numbers. supplement utilities for #java.lang.Math

 * supplement utilities for #java.lang.Math
 */
public final class MathUtils
{
	private static final Random random = new Random();
	
	private static final float DEG_TO_RAD = (float)(Math.PI / 180);
	private static final float RAD_TO_DEG = (float)(180 / Math.PI);

	private MathUtils()
	{
	}

	public static int clamp(int amount, int low, int high)
	{
		if(BuildConfig.DEBUG && low > high)
			throw new InvalidParameterException("low > high");
		return amount < low ? low : (amount > high ? high : amount);
	}

	public static long clamp(long amount, long low, long high)
	{
		if(BuildConfig.DEBUG && low > high)
			throw new InvalidParameterException("low > high");
		return amount < low ? low : (amount > high ? high : amount);
	}

	public static float clamp(float amount, float low, float high)
	{
		if(BuildConfig.DEBUG && low > high)
			throw new InvalidParameterException("low > high");
		return amount < low ? low : (amount > high ? high : amount);
	}

	public static float clamp(float amount)
	{
		if(amount < 0)
			return 0;
		else if(amount > 1)
			return 1;
		else return amount;
	}
	
	// with modulation fall in range [low, high]
	public static int wrap(int amount, int low, int high)
	{
		if(BuildConfig.DEBUG && low >= high)
			throw new InvalidParameterException("low >= high");
		
		int range = high - low + 1;
		if(amount < low)
			amount += range *((low - amount)/range + 1);
		
		return low + (amount - low)%range;
	}
	
	public static float max(float a, float b, float c)
	{
//		return Math.max(Math.max(a, b), c); // take consider NAN condition
		return a > b ? (a > c ? a : c) : (b > c ? b : c);