diff options
Diffstat (limited to 'core/java/android')
| -rw-r--r-- | core/java/android/util/MathUtils.java | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/core/java/android/util/MathUtils.java b/core/java/android/util/MathUtils.java index 36d5b50..8b57d3d 100644 --- a/core/java/android/util/MathUtils.java +++ b/core/java/android/util/MathUtils.java @@ -20,7 +20,7 @@ import java.util.Random; /** * A class that contains utility methods related to numbers. - * + * * @hide Pending API council approval */ public final class MathUtils { @@ -32,7 +32,7 @@ public final class MathUtils { } public static float abs(float v) { - return v > 0 ? v : -v; + return v > 0 ? v : -v; } public static int constrain(int amount, int low, int high) { @@ -116,6 +116,14 @@ public final class MathUtils { return v * v; } + public static float dot(float v1x, float v1y, float v2x, float v2y) { + return v1x * v2x + v1y * v2y; + } + + public static float cross(float v1x, float v1y, float v2x, float v2y) { + return v1x * v2y - v1y * v2x; + } + public static float radians(float degrees) { return degrees * DEG_TO_RAD; } @@ -142,16 +150,16 @@ public final class MathUtils { public static float tan(float angle) { return (float) Math.tan(angle); - } + } public static float lerp(float start, float stop, float amount) { return start + (stop - start) * amount; } - + public static float norm(float start, float stop, float value) { return (value - start) / (stop - start); } - + public static float map(float minStart, float minStop, float maxStart, float maxStop, float value) { return maxStart + (maxStart - maxStop) * ((value - minStart) / (minStop - minStart)); } @@ -164,7 +172,7 @@ public final class MathUtils { if (howsmall >= howbig) return howsmall; return (int) (sRandom.nextFloat() * (howbig - howsmall) + howsmall); } - + public static float random(float howbig) { return sRandom.nextFloat() * howbig; } |