com.jennifer.ui.util.MathUtil.java Source code

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Here is the source code for com.jennifer.ui.util.MathUtil.java

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/*
 * Copyright (C) 2014 (JenniferSoft Inc.)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.jennifer.ui.util;

import org.json.JSONArray;
import org.json.JSONObject;

/**
 * Created by yuni on 2014-10-24.
 */
public class MathUtil {
    public static double rotateX(double x, double y, double radian) {
        return x * Math.cos(radian) - y * Math.sin(radian);
    }

    public static double rotateY(double x, double y, double radian) {
        return x * Math.sin(radian) + y * Math.cos(radian);
    }

    public static JSONObject rotate(double x, double y, double radian) {
        return new JSONObject().put("x", rotateX(x, y, radian)).put("y", rotateY(x, y, radian));
    }

    public static double radian(double degree) {
        return degree * Math.PI / 180;
    }

    public static double degree(double radian) {
        return radian * 180 / Math.PI;
    }

    public static double interpolateNumber(double a, double b, double t) {
        return a + (b - a) * t;
    }

    public static double interpolateRound(double a, double b, double t) {
        return Math.round(interpolateNumber(a, b, t));
    }

    private static double niceNum(double range, boolean round) {
        double exponent = Math.floor(Math.log10(range));
        double fraction = range / Math.pow(10, exponent);
        double nickFraction;

        if (round) {
            if (fraction < 1.5)
                nickFraction = 1;
            else if (fraction < 3)
                nickFraction = 2;
            else if (fraction < 7)
                nickFraction = 5;
            else
                nickFraction = 10;
        } else {
            if (fraction <= 1)
                nickFraction = 1;
            else if (fraction <= 2)
                nickFraction = 2;
            else if (fraction <= 5)
                nickFraction = 5;
            else
                nickFraction = 10;
        }

        return nickFraction * Math.pow(10, exponent);
    }

    private static double niceNum(double range) {
        return niceNum(range, false);
    }

    public static JSONArray nice(double min, double max, double ticks, boolean isNice) {

        double _max;
        double _min;

        if (min > max) {
            _max = min;
            _min = max;
        } else {
            _min = min;
            _max = max;
        }

        double _ticks = ticks;
        double _tickSpacing = 0;
        double _range;
        double _niceMin;
        double _niceMax;

        _range = (isNice) ? niceNum(_max - _min, false) : _max - _min;
        _tickSpacing = (isNice) ? niceNum(_range / _ticks, true) : _range / _ticks;
        _niceMin = (isNice) ? Math.floor(_min / _tickSpacing) * _tickSpacing : _min;
        _niceMax = (isNice) ? Math.floor(_max / _tickSpacing) * _tickSpacing : _max;

        return new JSONArray().put(_niceMin).put(_niceMax).put(_range).put(_tickSpacing);
    }
}