Math @author cyberpwn
| 29 | * @author cyberpwn |
| 30 | */ |
| 31 | public class M { |
| 32 | private static final int precision = 128; |
| 33 | private static final int modulus = 360 * precision; |
| 34 | private static final float[] sin = new float[modulus]; |
| 35 | public static int tick = 0; |
| 36 | |
| 37 | static { |
| 38 | for (int i = 0; i < sin.length; i++) { |
| 39 | sin[i] = (float) Math.sin((i * Math.PI) / (precision * 180)); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Scales B by an external range change so that <br/> |
| 45 | * <br/> |
| 46 | * BMIN < B < BMAX <br/> |
| 47 | * AMIN < RESULT < AMAX <br/> |
| 48 | * <br/> |
| 49 | * So Given rangeScale(0, 20, 0, 10, 5) -> 10 <br/> |
| 50 | * 0 < 5 < 10 <br/> |
| 51 | * 0 < ? < 20 <br/> |
| 52 | * <br/> |
| 53 | * would return 10 |
| 54 | * |
| 55 | * @param amin the resulting minimum |
| 56 | * @param amax the resulting maximum |
| 57 | * @param bmin the initial minimum |
| 58 | * @param bmax the initial maximum |
| 59 | * @param b the initial value |
| 60 | * @return the resulting value |
| 61 | */ |
| 62 | public static double rangeScale(double amin, double amax, double bmin, double bmax, double b) { |
| 63 | return amin + ((amax - amin) * ((b - bmin) / (bmax - bmin))); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Get the percent (inverse lerp) from "from" to "to" where "at". |
| 68 | * <p> |
| 69 | * If from = 0 and to = 100 and at = 25 then it would return 0.25 |
| 70 | * |
| 71 | * @param from the from |
| 72 | * @param to the to |
| 73 | * @param at the at |
| 74 | * @return the percent |
| 75 | */ |
| 76 | public static double lerpInverse(double from, double to, double at) { |
| 77 | return M.rangeScale(0, 1, from, to, at); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Linear interpolation from a to b where f is the percent across |
| 82 | * |
| 83 | * @param a the first pos (0) |
| 84 | * @param b the second pos (1) |
| 85 | * @param f the percent |
| 86 | * @return the value |
| 87 | */ |
| 88 | public static double lerp(double a, double b, double f) { |