michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.util;
michael@0: 
michael@0: import android.graphics.PointF;
michael@0: 
michael@0: import java.lang.IllegalArgumentException;
michael@0: 
michael@0: public final class FloatUtils {
michael@0:     private FloatUtils() {}
michael@0: 
michael@0:     public static boolean fuzzyEquals(float a, float b) {
michael@0:         return (Math.abs(a - b) < 1e-6);
michael@0:     }
michael@0: 
michael@0:     public static boolean fuzzyEquals(PointF a, PointF b) {
michael@0:         return fuzzyEquals(a.x, b.x) && fuzzyEquals(a.y, b.y);
michael@0:     }
michael@0: 
michael@0:     /*
michael@0:      * Returns the value that represents a linear transition between `from` and `to` at time `t`,
michael@0:      * which is on the scale [0, 1). Thus with t = 0.0f, this returns `from`; with t = 1.0f, this
michael@0:      * returns `to`; with t = 0.5f, this returns the value halfway from `from` to `to`.
michael@0:      */
michael@0:     public static float interpolate(float from, float to, float t) {
michael@0:         return from + (to - from) * t;
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Returns 'value', clamped so that it isn't any lower than 'low', and it
michael@0:      * isn't any higher than 'high'.
michael@0:      */
michael@0:     public static float clamp(float value, float low, float high) {
michael@0:         if (high < low) {
michael@0:           throw new IllegalArgumentException(
michael@0:               "clamp called with invalid parameters (" + high + " < " + low + ")" );
michael@0:         }
michael@0:         return Math.max(low, Math.min(high, value));
michael@0:     }
michael@0: }