Here you can find the source of fillVisible(final Graphics g, final JComponent c)
public static void fillVisible(final Graphics g, final JComponent c)
//package com.java2s; /*/*from w w w.j ava 2s .c om*/ * This file is part of WebLookAndFeel library. * * WebLookAndFeel library is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * WebLookAndFeel library 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 for more details. * * You should have received a copy of the GNU General Public License * along with WebLookAndFeel library. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Graphics; import java.awt.Rectangle; import java.awt.Shape; import javax.swing.JComponent; public class Main { /** * Fills either clipped or visible rect */ public static void fillVisible(final Graphics g, final JComponent c) { final Shape clip = g.getClip(); final Rectangle rect = clip != null ? clip.getBounds() : c.getVisibleRect(); g.fillRect(rect.x, rect.y, rect.width, rect.height); } }