文件名称:
java1think in java笔记(111)---打印 (2008-04-24 16:58:28)
开发工具:
文件大小: 127kb
下载次数: 0
上传时间: 2008-10-14
详细说明： java3think in java笔记(111)---打印 (2008-04-24 16:58:28) 标签：杂谈 1 默认情况下，print()方法会调用paint()来完成自己的工作。 2 选择一种字体和大小，决定字符串在页面上存在的位置，并且使用Graphics.drawSrting()方法在页面上画出字符串.必须精确地计算每行字符串在页面上存在的位置并确定字符串不会超出页面底部或者同其它行冲突。 import java.awt.*; import java.awt.event.*; public class PrintDemo extends Frame { Button printText = new Button("Print Text"), printGraphics = new Button("Print Graphics"); TextField ringNum = new TextField(3); Choice faces = new Choice(); Graphics g = null; Plot plot = ne w Plot3(); // Try different plots Toolkit tk = Toolkit.getDefaultToolkit(); public PrintDemo() { ringNum.setText("3"); ringNum.addTextListener(new RingL()); Panel p = new Panel(); p.setLayout(new FlowLayout()); printText.addActionListener(new TBL()); p.add(printText); p.add(new Label("Font:")); p.add(faces); printGraphics.addActionListener(new GBL()); p.add(printGraphics); p.add(new Label("Rings:")); p.add(ringNum); setLayout(new BorderLayout()); add(p, BorderLayout.NORTH); add(plot, BorderLayout.CENTER); String[] fontList = tk.getFontList(); for(int i = 0; i < fontList.length; i++) faces.add(fontList[i]); faces.select("Serif"); } class PrintData { public PrintJob pj; public int pageWidth, pageHeight; PrintData(String jobName) { pj = getToolkit().getPrintJob( PrintDemo.this, jobName, null); if(pj != null) { pageWidth = pj.getPageDimension().width; pageHeight= pj.getPageDimension().height; g = pj.getGraphics(); } } void end() { pj.end(); } } class ChangeFont { private int stringHeight; ChangeFont(String face, int style,int point){ if(g != null) { g.setFont(new Font(face, style, point)); stringHeight = g.getFontMetrics().getHeight(); } } int stringWidth(String s) { return g.getFontMetrics().stringWidth(s); } int stringHeight() { return stringHeight; } } class TBL implements ActionListener { public void actionPerformed(ActionEvent e) { PrintData pd = new PrintData("Print Text Test"); // Null means print job canceled: if(pd == null) return; String s = "PrintDemo"; ChangeFont cf = new ChangeFont( faces.getSelectedItem(), Font.ITALIC,72); g.drawString(s, (pd.pageWidth - cf.stringWidth(s)) / 2, (pd.pageHeight - cf.stringHeight()) / 3); s = "A smaller point size"; cf = new ChangeFont( faces.getSelectedItem(), Font.BOLD, 48); g.drawString(s, (pd.pageWidth - cf.stringWidth(s)) / 2, (int)((pd.pageHeight - cf.stringHeight())/1.5)); g.dispose(); pd.end(); } } class GBL implements ActionListener { public void actionPerformed(ActionEvent e) { PrintData pd = new PrintData("Print Graphics Test"); if(pd == null) return; plot.print(g); g.dispose(); pd.end(); } } class RingL implements TextListener { public void textValueChanged(TextEvent e) { int i = 1; try { i = Integer.parseInt(ringNum.getText()); } catch(NumberFormatException ex) { i = 1; } plot.rings = i; plot.repaint(); } } public static void main(String[] args) { Frame pdemo = new PrintDemo(); pdemo.setTitle("Print Demo"); pdemo.addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); pdemo.setSize(500, 500); pdemo.setVisible(true); } } class Plot extends Canvas { public int rings = 3; } class Plot1 extends Plot { // Default print() calls paint(): public void paint(Graphics g) { int w = getSize().width; int h = getSize().height; int xc = w / 2; int yc = w / 2; int x = 0, y = 0; for(int i = 0; i < rings; i++) { if(x < xc && y < yc) { g.drawOval(x, y, w, h); x += 10; y += 10; w -= 20; h -= 20; } } } } class Plot2 extends Plot { // To fit the picture to the page, you must // know whether you're printing or painting: public void paint(Graphics g) { int w, h; if(g instanceof PrintGraphics) { PrintJob pj = ((PrintGraphics)g).getPrintJob(); w = pj.getPageDimension().width; h = pj.getPageDimension().height; } else { w = getSize().width; h = getSize().height; } int xc = w / 2; int yc = w / 2; int x = 0, y = 0; for(int i = 0; i < rings; i++) { if(x < xc && y < yc) { g.drawOval(x, y, w, h); x += 10; y += 10; w -= 20; h -= 20; } } } } class Plot3 extends Plot { // Somewhat better. Separate // printing from painting: public void print(Graphics g) { // Assume it's a PrintGraphics object: PrintJob pj = ((PrintGraphics)g).getPrintJob(); int w = pj.getPageDimension().width; int h = pj.getPageDimension().height; doGraphics(g, w, h); } public void paint(Graphics g) { int w = getSize().width; int h = getSize().height; doGraphics(g, w, h); } private void doGraphics( Graphics g, int w, int h) { int xc = w / 2; int yc = w / 2; int x = 0, y = 0; for(int i = 0; i < rings; i++) { if(x < xc && y < yc) { g.drawOval(x, y, w, h); x += 10; y += 10; w -= 20; h -= 20; } } } } ...展开收缩
(系统自动生成,下载前可以参看下载内容)
下载文件列表
相关说明
- 本站资源为会员上传分享交流与学习,如有侵犯您的权益,请联系我们删除.
- 本站是交换下载平台，提供交流渠道，下载内容来自于网络，除下载问题外，其它问题请自行百度。
- 本站已设置防盗链，请勿用迅雷、QQ旋风等多线程下载软件下载资源，下载后用WinRAR最新版进行解压.
- 如果您发现内容无法下载，请稍后再次尝试；或者到消费记录里找到下载记录反馈给我们.
- 下载后发现下载的内容跟说明不相乎，请到消费记录里找到下载记录反馈给我们，经确认后退回积分.
- 如下载前有疑问，可以通过点击"提供者"的名字，查看对方的联系方式，联系对方咨询.
