roundhrefbuttonarea.java

此程序是用标准的JAVA2实现的一个图形程序

/*
 * @(#)RoundHrefButtonArea.java	1.13 04/07/26
 * 
 * Copyright (c) 2004 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 * 
 * -Redistribution 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.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL 
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST 
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, 
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY 
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, 
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

/*
 * @(#)RoundHrefButtonArea.java	1.13 04/07/26
 */

/**
 * An improved, round, "Fetch a URL" ImageArea class.
 * This class extends the HrefButtonArea Class to make the 3D button
 * a rounded ellipse.  All of the same feedback and operational
 * charactistics as the HrefButtonArea apply.
 *
 * @author 	Jim Graham
 * @version 	1.13, 07/26/04
 */
class RoundHrefButtonArea extends HrefButtonArea {
    /**
     * The filter used to create the 3D look for the button when it is up.
     */
    RoundButtonFilter roundfilter;

    /**
     * Test if the coordinate is inside the round region.  Use the test
     * provided by the filter that creates the 3D look for consistency.
     */
    public boolean inside(int x, int y) {
	return roundfilter.inside(x - X, y - Y);
    }

    /**
     * Construct the 3D look images that this area uses to draw the button.
     */
    public void makeImages() {
	roundfilter = new RoundButtonFilter(false, parent.hlpercent,
					    border, W, H);
	upImage = parent.getHighlight(X, Y, W, H, roundfilter);
	downImage = parent.getHighlight(X, Y, W, H,
					new RoundButtonFilter(true,
							      parent.hlpercent,
							      border, W, H));
    }
}