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Core visualization support for the JUNG project

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/*
 * Created on Oct 19, 2004
 *
 * Copyright (c) 2004, The JUNG Authors 
 *
 * All rights reserved.
 *
 * This software is open-source under the BSD license; see either
 * "license.txt" or
 * https://github.com/jrtom/jung/blob/master/LICENSE for a description.
 */
package edu.uci.ics.jung.visualization.util;

import java.awt.geom.GeneralPath;

/**
 * A utility class for creating arrowhead shapes.
 * 
 * @author Joshua O'Madadhain
 */
public class ArrowFactory
{
    /**
     * Returns an arrowhead in the shape of a simple isosceles triangle
     * with the specified base and height measurements.  It is placed
     * with the vertical axis along the negative x-axis, with its base
     * centered on (0,0).
     * 
     * @param base the width of the arrow's base
     * @param height the arrow's height
     * @return a path in the form of an isosceles triangle with dimensions {@code (base, height)}
     */
    public static GeneralPath getWedgeArrow(float base, float height)
    {
        GeneralPath arrow = new GeneralPath();
        arrow.moveTo(0,0);
        arrow.lineTo( - height, base/2.0f);
        arrow.lineTo( - height, -base/2.0f);
        arrow.lineTo( 0, 0 );
        return arrow;
    }

    /**
     * Returns an arrowhead in the shape of an isosceles triangle
     * with an isoceles-triangle notch taken out of the base,
     * with the specified base and height measurements.  It is placed
     * with the vertical axis along the negative x-axis, with its base
     * centered on (0,0).
     * 
     * @param base the width of the arrow's base
     * @param height the arrow's height
     * @param notch_height the height of the arrow's notch
     * @return a path in the form of a notched isosceles triangle
     */
    public static GeneralPath getNotchedArrow(float base, float height, float notch_height)
    {
        GeneralPath arrow = new GeneralPath();
        arrow.moveTo(0,0);
        arrow.lineTo(-height, base/2.0f);
        arrow.lineTo(-(height - notch_height), 0);
        arrow.lineTo(-height, -base/2.0f);
        arrow.lineTo(0,0);
        return arrow;
    }
}