Here you can find the source of drawString(Graphics g, String text, int underlinedChar, int x, int y)
public static void drawString(Graphics g, String text, int underlinedChar, int x, int y)
//package com.java2s; /**/*from w w w . ja v a2 s .co m*/ * Title: tn5250J * Copyright: Copyright (c) 2001,202,2003 * Company: * @author Kenneth J. Pouncey * @version 0.4 * * Description: * * This program 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 2, or (at your option) * any later version. * * 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 for more details. * * You should have received a copy of the GNU General Public License * along with this software; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307 USA * */ import java.awt.FontMetrics; import java.awt.Graphics; public class Main { /** Draw a string with the graphics g at location (x,y) just like g.drawString() would. * The first occurence of underlineChar in text will be underlined. The matching is * not case sensitive. */ public static void drawString(Graphics g, String text, int underlinedChar, int x, int y) { // char b[] = new char[1]; // String s; char lc, uc; int index = -1, lci, uci; if (underlinedChar != '\0') { // b[0] = (char)underlinedChar; // s = new String(b).toUpperCase(); // uc = s.charAt(0); uc = Character.toUpperCase((char) underlinedChar); // s = new String(b).toLowerCase(); lc = Character.toLowerCase((char) underlinedChar); uci = text.indexOf(uc); lci = text.indexOf(lc); if (uci == -1) index = lci; else if (lci == -1) index = uci; else index = (lci < uci) ? lci : uci; } g.drawString(text, x, y); if (index != -1) { FontMetrics fm = g.getFontMetrics(); // Rectangle underlineRect = new Rectangle(); int underlineRectX = x + fm.stringWidth(text.substring(0, index)); int underlineRectY = y; int underlineRectWidth = fm.charWidth(text.charAt(index)); int underlineRectHeight = 1; g.fillRect(underlineRectX, underlineRectY + fm.getDescent() - 1, underlineRectWidth, underlineRectHeight); } } }