Returns the angle of rotation (in radians) for the specified line. - Java 2D Graphics

Java examples for 2D Graphics:Line

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Description

Returns the angle of rotation (in radians) for the specified line.

Demo Code

/* --------------------------------------------------------===
 * Orson Charts : a 3D chart library for the Java(tm) platform
 * --------------------------------------------------------===
 * //from  www.ja va 2s .  com
 * (C)opyright 2013-2016, by Object Refinery Limited.  All rights reserved.
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//package com.java2s;

import java.awt.geom.Line2D;

public class Main {
    /**
     * Returns the angle of rotation (in radians) for the specified line.
     * 
     * @param line  the line ({@code null} not permitted).
     * 
     * @return The angle of rotation (in radians). 
     */
    public static double calculateTheta(Line2D line) {
        double dx = line.getX2() - line.getX1();
        double dy = line.getY2() - line.getY1();
        return Math.atan2(dy, dx);
    }
}

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