控制打印页面上面板的大小 [英] control the size of the panel on printed page
问题描述
我想用两个表打印jpanel.我遇到两个问题，第一个是打印图像的准确性不是很好.第二个我如何控制打印页面上jpanel的大小?
i want to print jpanel with two tables . Two problems i faced , the first one is the Accuracy of the printed image is not very good. the second how can i control the size of the jpanel on the printed page??
这是使用xps查看器打印的页面的图像(精度不好)
here is an image of the printed page using xps viewer(the accuracy is not good)
有没有办法以这种精度制作打印的图像像这样
is there away to make the printed image with this accuracy like this
这是代码:
PrinterJob printjob = PrinterJob.getPrinterJob();
printjob.setJobName(" TESSCO CUSTOMER CARD ");
Printable printable = new Printable() {
public int print(Graphics pg, PageFormat pf, int pageNum) {
if (pageNum > 0) {
return Printable.NO_SUCH_PAGE;
}
Dimension size = jPanel1.getSize();
BufferedImage bufferedImage = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_RGB);
jPanel1.print(bufferedImage.getGraphics());
Graphics2D g2 = (Graphics2D) pg;
g2.translate(pf.getImageableX(), pf.getImageableY());
g2.drawImage(bufferedImage, 0, 0, (int) pf.getWidth(), (int) pf.getHeight(), null);
return Printable.PAGE_EXISTS;
}
};
Paper paper = new Paper();
paper.setImageableArea(0, 0,700,890);
paper.setSize(700,890);
PageFormat format = new PageFormat();
format.setPaper(paper);
format.setOrientation(PageFormat.LANDSCAPE);
printjob.setPrintable(printable, format);
if (printjob.printDialog() == false)
return;
try {
printjob.print();
} catch (PrinterException ex) {
System.out.println("NO PAGE FOUND." + ex);
}
推荐答案
首先，不要使用窗格大小，您需要充当布局管理器并调整面板大小以适合页面.
Firstly, don't use the pane size, you need to act as the layout manager and size the panel to fit the page.
第二，不要使用缓冲的图像.这不会与打印引擎共享给您的图形上下文具有相同的属性.同样，另一种打印方法是可重入的，这意味着它可能为每个页面调用多次，这样创建缓冲图像会浪费资源
Secondly, don't use a buffered image. This will not share the same properties as the graphics context past to you by the print engine. Also, another print method is re-entrant, meaning that it may called a number of times for each page, creating a buffered image this way is wasteful on resources
您可能想看一下如何打印表格
更新
您可以做类似...
public int print(Graphics pg, PageFormat pf, int pageNum) {
if (page > 0) {
return NO_SUCH_PAGE;
}
Graphics2D g2d = (Graphics2D)pg;
double pageWidth = pf.getImageableWidth();
double pageHeight = pf.getImageableHeight();
double pageX = pf.getImageableX();
double pageY = pf.getImageableY();
g2d.translate(pageX, pageY);
double tableHeight = pageHeight / 2d;
jPanel1.setBounds(0, 0, (int)Math.floor(pageWidth), (int)Math.floor(pageHeight));
jPanel1.printAll(g2d);
return Printable.PAGE_EXISTS;
}
请注意，这可能会缩短表的长度.另外，您不应使用屏幕上已经存在的 Component 来执行此操作.您应该创建一个新的打印"组件.
Just beware, that this could have the potential of truncating your table. Also, you should not do this with a Component that is already on the screen. You should create a new "print" component.
使用工作示例进行更新
好的，所以这个概念很合理，只需要进行一些调整就可以使它起作用;)
Okay, so the concept is sound, just needed some tweaking to get it to work ;)
public class PrintTableTest {
public static void main(String[] args) {
final JTable table1 = new JTable(new AbstractTableModel() {
@Override
public int getRowCount() {
return 3;
}
@Override
public int getColumnCount() {
return 3;
}
@Override
public String getColumnName(int column) {
String name = null;
switch (column) {
case 0:
name = "Day";
break;
case 1:
name = "FirstName";
break;
case 2:
name = "LastName";
break;
}
return name;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Object value = null;
switch (columnIndex) {
case 0:
switch (rowIndex) {
case 0:
value = "First";
break;
case 1:
value = "Second";
break;
case 2:
value = "Final";
break;
}
break;
}
return value;
}
});
int rowHeight = (int) Math.floor(((700f / 2f) - table1.getTableHeader().getPreferredSize().height) / 3f);
table1.setRowHeight(rowHeight);
PrinterJob printjob = PrinterJob.getPrinterJob();
printjob.setJobName(" TESSCO CUSTOMER CARD ");
Printable printable;
printable = new Printable() {
public int print(Graphics pg, PageFormat pf, int pageNum) {
if (pageNum > 0) {
return NO_SUCH_PAGE;
}
Graphics2D g2d = (Graphics2D) pg;
double pageWidth = pf.getImageableWidth();
double pageHeight = pf.getImageableHeight();
double pageX = pf.getImageableX();
double pageY = pf.getImageableY();
g2d.translate(pageX, pageY);
// Each table will take half the page...
double tableHeight = pageHeight / 2d;
// We need to print the header as well...
JTableHeader header = table1.getTableHeader();
int headerHeight = header.getPreferredSize().height;
int yOffset = 0;
for (int index = 0; index < 2; index++) {
// Set the bounds of the components
// The yOffset is actuall irrelevent to us, but for consitency sake
// we'll keep it.
header.setBounds(0, yOffset, (int) Math.floor(pageWidth), headerHeight);
table1.setBounds(0, yOffset + headerHeight, (int) Math.floor(pageWidth), (int) Math.floor(tableHeight));
// Force the components to update there internal layouts to match
// the new size. We need to do this because, technically, we're not
// attached to any peer, nor do we want them to be taking into account
// the dimensions of any parent any way :P
table1.doLayout();
header.doLayout();
// Translate the graphics. Components asume a position of 0x0 when
// painting. This is a side effect of the AWT/Swing painting engine
// (for which we are greatful), but we need to simulate the change
g2d.translate(0, yOffset);
header.printAll(g2d);
// Translations are relative to the last translation...
g2d.translate(0, headerHeight);
table1.printAll(g2d);
// Reset the last translation
g2d.translate(0, -(headerHeight + yOffset));
// Next table...
yOffset += table1.getHeight();
}
return Printable.PAGE_EXISTS;
}
};
Paper paper = new Paper();
paper.setImageableArea(0, 0, 700, 890);
paper.setSize(700, 890);
PageFormat format = new PageFormat();
format.setPaper(paper);
format.setOrientation(PageFormat.LANDSCAPE);
// printjob.setPrintable(printable, format);
BufferedImage img = new BufferedImage(890, 700, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = img.createGraphics();
g2d.setColor(Color.WHITE);
g2d.fill(new Rectangle(0, 0, 890, 700));
try {
printable.print(g2d, format, 0);
} catch (Exception exp) {
exp.printStackTrace();
}
g2d.dispose();
try {
ImageIO.write(img, "png", new File("Print.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
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