Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2012 www.amsoft.cn
 * 
 * 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 {

    public static boolean eLineOnELine(double x1, double y1, double x2, double y2, double x3, double y3, double x4,
            double y4) {
        double k1 = (y2 - y1) / (x2 - x1);
        double k2 = (y4 - y3) / (x4 - x3);
        if (k1 == k2) {
            return false;
        } else {
            double x = ((x1 * y2 - y1 * x2) * (x3 - x4) - (x3 * y4 - y3 * x4) * (x1 - x2))
                    / ((y2 - y1) * (x3 - x4) - (y4 - y3) * (x1 - x2));
            double y = (x1 * y2 - y1 * x2 - x * (y2 - y1)) / (x1 - x2);
            if (x >= Math.min(x1, x2) && x <= Math.max(x1, x2) && y >= Math.min(y1, y2) && y <= Math.max(y1, y2)
                    && x >= Math.min(x3, x4) && x <= Math.max(x3, x4) && y >= Math.min(y3, y4)
                    && y <= Math.max(y3, y4)) {
                return true;
            } else {
                return false;
            }
        }
    }
}