Here you can find the source of isVisible(JComponent c, Rectangle r)
public static boolean isVisible(JComponent c, Rectangle r)
//package com.java2s; /* /*from w w w.ja v a 2 s .com*/ * Copyright 2003,2004,2005 Colin Crist * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ import java.awt.Rectangle; import javax.swing.JComponent; public class Main { public static boolean isVisible(JComponent c, Rectangle r) { return c.getVisibleRect().contains(r); } }