MathUtil.java

/*
 * Copyright 2014 Google Inc.
 *
 * 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 oak.svg;

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;
    }

    private MathUtil() {
    }
}