MathUtil.java

package com.xjf.repository.view.locuspassword;

public class MathUtil {
    /**
     * 两点间的距离
     *
     * @param x1
     * @param y1
     * @param x2
     * @param y2
     * @return
     */
    public static double distance(double x1, double y1, double x2, double y2) {
        return Math.sqrt(Math.abs(x1 - x2) * Math.abs(x1 - x2)+ Math.abs(y1 - y2) * Math.abs(y1 - y2));
    }

    /**
     * 计算点a(x,y)的角度
     *
     * @param x
     * @param y
     * @return
     */
    public static double pointTotoDegrees(double x, double y) {
        return Math.toDegrees(Math.atan2(x, y));
    }


    public static boolean checkInRound(float sx, float sy, float r, float x, float y) {
        return Math.sqrt((sx - x) * (sx - x) + (sy - y) * (sy - y)) < r;
    }
}