Here you can find the source of getDefaultFontRenderContext()
public static synchronized FontRenderContext getDefaultFontRenderContext()
//package com.java2s; /******************************************************************************** * * * (c) Copyright 2010 Verizon Communications USA and The Open University UK * * * * This software is freely distributed in accordance with * * the GNU Lesser General Public (LGPL) license, version 3 or later * * as published by the Free Software Foundation. * * For details see LGPL: http://www.fsf.org/licensing/licenses/lgpl.html * * and GPL: http://www.fsf.org/licensing/licenses/gpl-3.0.html * * * * This software is provided by the copyright holders 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 copyright owner 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. * * * ********************************************************************************/ import java.awt.Graphics2D; import java.awt.GraphicsConfiguration; import java.awt.GraphicsDevice; import java.awt.GraphicsEnvironment; import java.awt.font.FontRenderContext; import java.awt.image.BufferedImage; public class Main { /** A FontRenderContext that can be used to measure Strings */ private static FontRenderContext frc = null; /**//from www. jav a 2 s . c o m * Gets the FontRenderContext for the default screen-device. * The FontRenderContext returned here, can be used to measure * for instance the visual size of Strings that are to be painted by a component * that is not realized yet. * The FontRenderContext is mapped to the defaultScreenDevice * of the JVM. The returned here FontRenderContext can only to be used for * components that are painted onto the screen if you need a FontRenderContex * for printing this will probably not work. * For performance reasons we return only a reference * to a static FontRenderContext-object that is created in this class. * You should take care NOT to set the object returned here to null. * If you do this method will have to create a new one next time it is called. * So just use the returned FontRenderContext for obtaining the * metrics of a font and than leave it alone. * @author FahleE (Sun Developer Forum) * @return FontRenderContext a FontRenderContext for the * default screen. */ public static synchronized FontRenderContext getDefaultFontRenderContext() { if (frc == null) createFontRenderContext(); return frc; } /** * This method returns the FontRenderContext * for the default Screen-device. * @author FahleE (Sun Developer Forum) * @return FontRenderContext the FontRenderContext that is used for the screen-device */ private static void createFontRenderContext() { GraphicsConfiguration gc = getDefaultConfiguration(); BufferedImage bi = gc.createCompatibleImage(1, 1); //we need at least one pixel Graphics2D g2 = bi.createGraphics(); frc = g2.getFontRenderContext(); } /** * Get the current GraphicsConfiguration for this machine. * @author DrLaszloJamf (Sun Developer Forum) * @return GraphicsConfiguration the current graphics configuration. */ public static GraphicsConfiguration getDefaultConfiguration() { GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); GraphicsDevice gd = ge.getDefaultScreenDevice(); return gd.getDefaultConfiguration(); } }