Draw an arrow - Java 2D Graphics

Java examples for 2D Graphics:Shape

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Description

Draw an arrow

Demo Code

/*//from w  w  w.  ja  va2 s  .  c o m
 * A Collection of Miscellaneous Utilities
 *
 * Copyright 2010
 *      The President and Fellows of Harvard College.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
//package com.java2s;

import java.awt.*;

public class Main {
    /**
     * Draw an arrow
     *
     * @param g the graphics object
     * @param x1 the source X coordinate
     * @param y1 the source Y coordinate
     * @param x2 the target X coordinate
     * @param y2 the target Y coordinate
     * @param stroke the stroke size
     * @param filled whether to fill the arrowhead
     */
    public static void drawArrow(Graphics g, int x1, int y1, int x2,
            int y2, double stroke, boolean filled) {
        g.drawLine(x2, y2, x1, y1);
        drawArrowHead(g, x1, y1, x2, y2, stroke, filled);
    }

    /**
     * Draw an arrow head
     *
     * @param g the graphics object
     * @param x1 the source X coordinate
     * @param y1 the source Y coordinate
     * @param x2 the target X coordinate
     * @param y2 the target Y coordinate
     * @param size the head size
     * @param filled whether to fill the arrowhead
     */
    public static void drawArrowHead(Graphics g, int x1, int y1, int x2,
            int y2, double size, boolean filled) {

        // Original source code: http://forums.sun.com/thread.jspa?threadID=378460

        Polygon p = new Polygon();
        double aDir = Math.atan2(x1 - x2, y1 - y2);
        int i1 = (int) size;
        //int i2 =  6 + (int) stroke;

        p.addPoint(x2, y2);
        p.addPoint(x2 + xCor(i1, aDir + .5), y2 + yCor(i1, aDir + .5));
        //p.addPoint(x2 + xCor(i2, aDir   ), y2 + yCor(i2, aDir   ));
        p.addPoint(x2 + xCor(i1, aDir - .5), y2 + yCor(i1, aDir - .5));
        p.addPoint(x2, y2);

        if (filled)
            g.fillPolygon(p);
        else
            g.drawPolygon(p);
    }

    private static int xCor(int len, double dir) {
        return (int) (len * Math.sin(dir));
    }

    private static int yCor(int len, double dir) {
        return (int) (len * Math.cos(dir));
    }
}

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