1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/util/FloatUtils.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,43 @@
1.4 +/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +package org.mozilla.gecko.util;
1.10 +
1.11 +import android.graphics.PointF;
1.12 +
1.13 +import java.lang.IllegalArgumentException;
1.14 +
1.15 +public final class FloatUtils {
1.16 + private FloatUtils() {}
1.17 +
1.18 + public static boolean fuzzyEquals(float a, float b) {
1.19 + return (Math.abs(a - b) < 1e-6);
1.20 + }
1.21 +
1.22 + public static boolean fuzzyEquals(PointF a, PointF b) {
1.23 + return fuzzyEquals(a.x, b.x) && fuzzyEquals(a.y, b.y);
1.24 + }
1.25 +
1.26 + /*
1.27 + * Returns the value that represents a linear transition between `from` and `to` at time `t`,
1.28 + * which is on the scale [0, 1). Thus with t = 0.0f, this returns `from`; with t = 1.0f, this
1.29 + * returns `to`; with t = 0.5f, this returns the value halfway from `from` to `to`.
1.30 + */
1.31 + public static float interpolate(float from, float to, float t) {
1.32 + return from + (to - from) * t;
1.33 + }
1.34 +
1.35 + /**
1.36 + * Returns 'value', clamped so that it isn't any lower than 'low', and it
1.37 + * isn't any higher than 'high'.
1.38 + */
1.39 + public static float clamp(float value, float low, float high) {
1.40 + if (high < low) {
1.41 + throw new IllegalArgumentException(
1.42 + "clamp called with invalid parameters (" + high + " < " + low + ")" );
1.43 + }
1.44 + return Math.max(low, Math.min(high, value));
1.45 + }
1.46 +}
