constrainablegraphics.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 55 行

/*
 * @(#)ConstrainableGraphics.java	1.8 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation. 
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt). 
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA 
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions. 
 *
 */

package sun.awt;

/**
 * This interface can be implemented on a Graphics object to allow
 * the lightweight component code to permanently install a rectangular
 * maximum clip that cannot be extended with setClip and which works in
 * conjunction with the hit() and getTransform() methods of Graphics2D
 * to make it appear as if there really was a component with these
 * dimensions.
 */
public interface ConstrainableGraphics {
    /**
     * Constrain this graphics object to have a permanent device space
     * origin of (x, y) and a permanent maximum clip of (x,y,w,h).
     * Calling this method is roughly equivalent to:
     *    g.translate(x, y);
     *    g.clipRect(0, 0, w, h);
     * except that the clip can never be extended outside of these
     * bounds, even with setClip() and for the fact that the (x,y)
     * become a new device space coordinate origin.
     *
     * These methods are recursive so that you can further restrict
     * the object by calling the constrain() method more times, but
     * you can never enlarge its restricted maximum clip.
     */
    public void constrain(int x, int y, int w, int h);
}