Returns a path for the arrow at the end of an edge from p1 to p2. - Java 2D Graphics

Java examples for 2D Graphics:Shape

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Description

Returns a path for the arrow at the end of an edge from p1 to p2.

Demo Code

/*-------------------------------------------------------------------------+
|                                                                          |
| Copyright 2005-2011 The ConQAT Project                                   |
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| 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                                  |
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|    http://www.apache.org/licenses/LICENSE-2.0                            |
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| Unless required by applicable law or agreed to in writing, software      |
| distributed under the License is distributed on an "AS IS" BASIS,        |
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| limitations under the License.                                           |
+-------------------------------------------------------------------------*/
//package com.java2s;
import java.awt.Point;

import java.awt.geom.GeneralPath;

public class Main {
    /**/*from   www .j av  a2 s.  com*/
     * Returns a path for the arrow at the end of an edge from p1 to p2.
     * 
     * @param arrowBarbSize
     *            gives the size of the barb in pixels (i.e. the size of the
     *            arrow tip)
     * @param arrowPhi
     *            gives the angle between the barbs and the center line, i.e.
     *            this is half of the angle of the arrow tip.
     */
    public static GeneralPath getArrowHead(Point p1, Point p2,
            int arrowBarbSize, double arrowPhi) {
        double theta = Math.atan2(p2.y - p1.y, p2.x - p1.x);

        GeneralPath path = new GeneralPath();

        // Add an arrow head at p2
        double x = p2.x + arrowBarbSize
                * Math.cos(theta + Math.PI - arrowPhi);
        double y = p2.y + arrowBarbSize
                * Math.sin(theta + Math.PI - arrowPhi);
        path.moveTo((float) x, (float) y);
        path.lineTo(p2.x, p2.y);
        x = p2.x + arrowBarbSize * Math.cos(theta + Math.PI + arrowPhi);
        y = p2.y + arrowBarbSize * Math.sin(theta + Math.PI + arrowPhi);
        path.lineTo((float) x, (float) y);

        return path;
    }
}

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