java实现打印的实例 - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-25
| ng(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; } } } } ///:~ 这个程序允许我们从一个选择列表 |
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