Android Open Source - muzei Math Util

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2014 Google Inc./* w w w .jav  a 2s . co m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.android.apps.muzei.util;

import android.util.FloatMath;

public class MathUtil {
    public static float constrain(float min, float max, float v) {
        return Math.max(min, Math.min(max, v));
    }

    public static float interpolate(float x1, float x2, float f) {
        return x1 + (x2 - x1) * f;
    }

    public static float uninterpolate(float x1, float x2, float v) {
        if (x2 - x1 == 0) {
            throw new IllegalArgumentException("Can't reverse interpolate with domain size of 0");
        }
        return (v - x1) / (x2 - x1);
    }

    public static float dist(float x, float y) {
        return FloatMath.sqrt(x * x + y * y);
    }

    public static int floorEven(int num) {
        return num & ~0x01;
    }

    public static int roundMult4(int num) {
        return (num + 2) & ~0x03;
    }

    public static boolean isEven(int num) {
        return num % 2 == 0;
    }

    // divide two integers but round up
    // see http://stackoverflow.com/a/7446742/102703
    public static int intDivideRoundUp(int num, int divisor) {
        int sign = (num > 0 ? 1 : -1) * (divisor > 0 ? 1 : -1);
        return sign * (Math.abs(num) + Math.abs(divisor) - 1) / Math.abs(divisor);
    }

    private MathUtil() {
    }
}

Java Source Code List

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