Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2005 JBoss 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.
 */

public class Main {
    private static double PI = 3.1415927;
    private static int MOD_NUM = 100;

    /***************************************************************************
     * This procedure is passed the basepoint of the intersection of two lines
     * as well as the other two endpoints of the lines and calculates the angle
     * inscribed by these three points.
     **************************************************************************/
    private static double inscribed_angle(int basepoint, int p1, int p2) {
        double angle1, angle2, temp;

        /*
         * Get the angle between line #1 and the origin and the angle between
         * line #2 and the origin, and then subtract these values.
         */
        angle1 = get_angle(basepoint, p1);
        angle2 = get_angle(basepoint, p2);
        temp = angle1 - angle2;
        if (temp < 0.0)
            temp = -temp;

        /*
         * We always want the smaller of the two angles inscribed, so if the
         * answer is greater than 180 degrees, calculate the smaller angle and
         * return it.
         */
        if (temp > PI)
            temp = 2 * PI - temp;
        if (temp < 0.0)
            return (-temp);
        return (temp);
    }

    /***************************************************************************
     * This function is passed two points and calculates the angle between the
     * line defined by these points and the x-axis.
     **************************************************************************/
    private static double get_angle(int p1, int p2) {
        int delta_x, delta_y;
        double ret = 0.0;
        /*
         * Calculate (x2 - x1) and (y2 - y1). The points are passed in the form
         * x1y1 and x2y2. get_x() and get_y() are passed these points and return
         * the x and y values respectively. For example, get_x(1020) returns 10.
         */
        delta_x = get_x(p2) - get_x(p1);
        delta_y = get_y(p2) - get_y(p1);

        if (delta_x == 0) {
            if (delta_y > 0) {
                ret = PI / 2;
            } else if (delta_y < 0) {
                ret = -PI / 2;
            }
        } else if (delta_y == 0) {
            if (delta_x > 0) {
                ret = 0.0;
            } else if (delta_x < 0) {
                ret = PI;
            }
        } else {
            ret = Math.atan2(delta_y, delta_x);
        }
        return ret;
    }

    private static int get_x(int val) {
        return (int) (val / MOD_NUM);
    }

    private static int get_y(int val) {
        return val % MOD_NUM;
    }
}