Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.graphics.PointF;

public class Main {
    /**
     *
     * Cross of line from (x1, y1) to (x2, y2) by line from (m1, n1) to (m2, n2)
     *
     * @param x1
     * @param y1
     * @param x2
     * @param y2
     * @param m1
     * @param n1
     * @param m2
     * @param n2
     *
     * @return cross point in PointF
     */
    public static PointF crossPointOfTwoLines(float x1, float y1, float x2, float y2, float m1, float n1, float m2,
            float n2) {
        float a1 = 0, b1 = 0, a2 = 0, b2 = 0;
        float x0 = 0, y0 = 0;

        if (m1 == x1) {
            x0 = x1;
        } else {
            a1 = (n1 - y1) / (m1 - x1);
            b1 = n1 - a1 * m1;
        }

        if (m2 == x2) {
            x0 = x2;
        } else {
            a2 = (n2 - y2) / (m2 - x2);
            b2 = n2 - a2 * m2;
        }

        if (a1 != a2 && m1 != x1 && m2 != x2) {
            x0 = (b1 - b2) / (a2 - a1);
        }

        if (a1 == 0) {
            y0 = a2 * x0 + b2;
        } else {
            y0 = a1 * x0 + b1;
        }

        return new PointF(x0, y0);
    }
}