在基础版问了个JAVA画图程序的打印问题,快一个月了没几个人回复,在GUI版重复一下

[cql0007]

我是要打印canvas界面上的东西,都是由Graphics画出来的,想要有彩色,想要能通过打印对话框来设置纸型大小和纵横向

具体请见:http://community.csdn.net/Expert/topic/4600/4600325.xml?temp=.5784418

[ZHGUY]

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.print.*;
import javax.swing.*;
import javax.swing.border.*;

public class PrintPreview extends JFrame
{
protected int m_wPage;
protected int m_hPage;
protected Printable m_target;
protected JComboBox m_cbScale;
protected PreviewContainer m_preview;

public PrintPreview(Printable target) {
this(target, "Print Preview");
}

public PrintPreview(Printable target, String title) {
super(title);
setSize(600, 400);
m_target = target;

JToolBar tb = new JToolBar();
JButton bt = new JButton("Print", new ImageIcon("print.gif"));
ActionListener lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
// Use default printer, no dialog
PrinterJob prnJob = PrinterJob.getPrinterJob();
prnJob.setPrintable(m_target);
setCursor( Cursor.getPredefinedCursor(
Cursor.WAIT_CURSOR));
prnJob.print();
setCursor( Cursor.getPredefinedCursor(
Cursor.DEFAULT_CURSOR));
dispose();
}
catch (PrinterException ex) {
ex.printStackTrace();
System.err.println("Printing error: "+ex.toString());
}
}
};
bt.addActionListener(lst);
bt.setAlignmentY(0.5f);
bt.setMargin(new Insets(4,6,4,6));
tb.add(bt);

bt = new JButton("Close");
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
}
};
bt.addActionListener(lst);
bt.setAlignmentY(0.5f);
bt.setMargin(new Insets(2,6,2,6));
tb.add(bt);

String[] scales = { "10 %", "25 %", "50 %", "100 %" };
m_cbScale = new JComboBox(scales);
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thread runner = new Thread() {
public void run() {
String str = m_cbScale.getSelectedItem().
toString();
if (str.endsWith("%"))
str = str.substring(0, str.length()-1);
str = str.trim();
int scale = 0;
try { scale = Integer.parseInt(str); }
catch (NumberFormatException ex) { return; }
int w = (int)(m_wPage*scale/100);
int h = (int)(m_hPage*scale/100);

Component[] comps = m_preview.getComponents();
for (int k=0; k<comps.length; k++) {
if (!(comps[k] instanceof PagePreview))
continue;
PagePreview pp = (PagePreview)comps[k];
pp.setScaledSize(w, h);
}
m_preview.doLayout();
m_preview.getParent().getParent().validate();
}
};
runner.start();
}
};
m_cbScale.addActionListener(lst);
m_cbScale.setMaximumSize(m_cbScale.getPreferredSize());
m_cbScale.setEditable(true);
tb.addSeparator();
tb.add(m_cbScale);
getContentPane().add(tb, BorderLayout.NORTH);

m_preview = new PreviewContainer();

PrinterJob prnJob = PrinterJob.getPrinterJob();
PageFormat pageFormat = prnJob.defaultPage();
if (pageFormat.getHeight()==0 || pageFormat.getWidth()==0) {
System.err.println("Unable to determine default page size");
return;
}
m_wPage = (int)(pageFormat.getWidth());
m_hPage = (int)(pageFormat.getHeight());
int scale = 10;
int w = (int)(m_wPage*scale/100);
int h = (int)(m_hPage*scale/100);

int pageIndex = 0;
try {
while (true) {
BufferedImage img = new BufferedImage(m_wPage,
m_hPage, BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, m_wPage, m_hPage);
if (target.print(g, pageFormat, pageIndex) !=
Printable.PAGE_EXISTS)
break;
PagePreview pp = new PagePreview(w, h, img);
m_preview.add(pp);
pageIndex++;
}
}
catch (PrinterException e) {
e.printStackTrace();
System.err.println("Printing error: "+e.toString());
}

JScrollPane ps = new JScrollPane(m_preview);
getContentPane().add(ps, BorderLayout.CENTER);

setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setVisible(true);
}

class PreviewContainer extends JPanel
{
protected int H_GAP = 16;
protected int V_GAP = 10;

public Dimension getPreferredSize() {
int n = getComponentCount();
if (n == 0)
return new Dimension(H_GAP, V_GAP);
Component comp = getComponent(0);
Dimension dc = comp.getPreferredSize();
int w = dc.width;
int h = dc.height;

Dimension dp = getParent().getSize();
int nCol = Math.max((dp.width-H_GAP)/(w+H_GAP), 1);
int nRow = n/nCol;
if (nRow*nCol < n)
nRow++;

int ww = nCol*(w+H_GAP) + H_GAP;
int hh = nRow*(h+V_GAP) + V_GAP;
Insets ins = getInsets();
return new Dimension(ww+ins.left+ins.right,
hh+ins.top+ins.bottom);
}

public Dimension getMaximumSize() {
return getPreferredSize();
}

public Dimension getMinimumSize() {
return getPreferredSize();
}

public void doLayout() {
Insets ins = getInsets();
int x = ins.left + H_GAP;
int y = ins.top + V_GAP;

int n = getComponentCount();
if (n == 0)
return;
Component comp = getComponent(0);
Dimension dc = comp.getPreferredSize();
int w = dc.width;
int h = dc.height;

Dimension dp = getParent().getSize();
int nCol = Math.max((dp.width-H_GAP)/(w+H_GAP), 1);
int nRow = n/nCol;
if (nRow*nCol < n)
nRow++;

int index = 0;
for (int k = 0; k<nRow; k++) {
for (int m = 0; m<nCol; m++) {
if (index >= n)
return;
comp = getComponent(index++);
comp.setBounds(x, y, w, h);
x += w+H_GAP;
}
y += h+V_GAP;
x = ins.left + H_GAP;
}
}
}

class PagePreview extends JPanel
{
protected int m_w;
protected int m_h;
protected Image m_source;
protected Image m_img;

public PagePreview(int w, int h, Image source) {
m_w = w;
m_h = h;
m_source= source;
m_img = m_source.getScaledInstance(m_w, m_h,
Image.SCALE_SMOOTH);
m_img.flush();
setBackground(Color.white);
setBorder(new MatteBorder(1, 1, 2, 2, Color.black));
}

public void setScaledSize(int w, int h) {
m_w = w;
m_h = h;
m_img = m_source.getScaledInstance(m_w, m_h,
Image.SCALE_SMOOTH);
repaint();
}

public Dimension getPreferredSize() {
Insets ins = getInsets();
return new Dimension(m_w+ins.left+ins.right,
m_h+ins.top+ins.bottom);
}

public Dimension getMaximumSize() {
return getPreferredSize();
}

public Dimension getMinimumSize() {
return getPreferredSize();
}

public void paint(Graphics g) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
g.drawImage(m_img, 0, 0, this);
paintBorder(g);
}
}
}