Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2016 GcsSloop
 *
 * 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.
 *
 * Last modified 2016-12-03 22:55:55
 *
 */

import android.graphics.Point;

public class Main {
    /**
     * Get the coordinates of a point on the line by cut length.
     *
     * @param A         Point A
     * @param B         Point B
     * @param cutLength cut length
     * @return the point.
     */
    public static Point getPointByCutLength(Point A, Point B, int cutLength) {
        float radian = getRadian(A, B);
        return new Point(A.x + (int) (cutLength * Math.cos(radian)), A.y + (int) (cutLength * Math.sin(radian)));
    }

    /**
     * Get the radian between current line(determined by point A and B) and horizontal line.
     *
     * @param A point A
     * @param B point B
     * @return the radian
     */
    public static float getRadian(Point A, Point B) {
        float lenA = B.x - A.x;
        float lenB = B.y - A.y;
        float lenC = (float) Math.sqrt(lenA * lenA + lenB * lenB);
        float radian = (float) Math.acos(lenA / lenC);
        radian = radian * (B.y < A.y ? -1 : 1);
        return radian;
    }
}