将PrinterJob对象修改为BufferedImage的特定打印格式 [英] fitting PrinterJob Object to specific print format of BufferedImage
问题描述
我使用PrinterJob对象打印我的Bufferedimage，我有一个BufferedImage，我处理并发送到打印机作业与纸格式等，我不能使其适合我的卡片打印机。当我将其保存到我的硬盘并通过Windows打印管理器打印，它在我的卡片打印机打印非常好，但是PrinterJob它出来太大，不适合卡
Im using PrinterJob object in order to print my Bufferedimage, I have a BufferedImage which I proccess and send it to Printer job with Paper Format etc, and I cant make it fittable to my card printer. when i save it to my hard-disk and print via windows printing manager it printing very good on my card printer but with PrinterJob it came out too big and not fittable for a card
卡的大小是86X54mm，我的缓冲图像的大小是1300x816px
代码：
the size of the card is 86X54mm and the size of my buffered image is 1300x816px The Code :
PrinterJob printjob = PrinterJob.getPrinterJob();
printjob.setJobName("CardPrint");
Printable printable = new Printable() {
public int print(Graphics pg, PageFormat pf, int pageNum) {
if (pageNum > 0) {
return Printable.NO_SUCH_PAGE;
}
JLayeredPane j1 = new JLayeredPane();
Dimension size = j1.getSize();
j1.print(bi.getGraphics());
Graphics2D g2 = (Graphics2D) pg;
g2.translate(pf.getImageableX(), pf.getImageableY());
g2.drawImage(bi, 0, 0, (int) pf.getWidth(), (int) pf.getHeight(), null);
return Printable.PAGE_EXISTS;
}
};
Paper paper = new Paper();
paper.setImageableArea(0, 0, 0, 0);
paper.setSize(1.15, 0.72);
PageFormat format = new PageFormat();
format.setPaper(paper);
printjob.setPrintable(printable, format);
try {
printjob.printDialog();
printjob.print();
} catch (Exception eee){
System.out.println("NO PAGE FOUND."+eee.toString());
}
我发现
paper.setSize 1.15，0.7）;
为英寸（ http ：//docs.oracle.com/javase/1.5.0/docs/api/java/awt/print/Paper.html ）
paper.setImageableArea（0，0，0，0）;
，我不知道这个setImageableArea。
I found out that paper.setSize(1.15, 0.7); is in inch (http://docs.oracle.com/javase/1.5.0/docs/api/java/awt/print/Paper.html) paper.setImageableArea(0, 0, 0, 0); and i dont know about this setImageableArea.
有没有任何关于当前大小的线索，我做错了计算？
谢谢。
does any one has clue about the current sizes, do i made a mistake calculating ? thanks.
推荐答案
首先打印，打印是有趣的 - 记住，重复上午2点...
First of printing, "Printing is Fun" - remember, repeat this at 2am...
基本上，您需要首先将纸张尺寸从CM转换为像素。 Java使用72dpi作为API。
Basically, you need to start by converting your paper size from CM to pixels. Java uses 72dpi for it's API.
所以你的页面大小为8.6x5.4厘米计算为153.0708659856 x 243.7795273104像素
So you page size of 8.6x5.4cm calculates to 153.0708659856 x 243.7795273104 pixels
然后你需要创建符合这些页面要求的新的 Paper
Then you need to create a new Paper that meets those page requirements...
这一切都需要被包裹回 PageFormat 并交回 PrintJob 。
This all needs to be wrapped back into a PageFormat and handed back to the PrintJob.
在可打印中，您需要将图像缩放为适合可打印区域。图像缩放很有趣...
Within the Printable, you need to scale the image to "fit" the printable area. Image scaling is fun...
所以，对我来说，我的图像是800x1159，缩小到166x241
So, for me test, I had an image of 800x1159, which was scaled down to 166x241
要更好地讨论图像缩放，请参阅这个问题
For a better discussion on image scaling check out this question
public class PrintTest02 {
private static BufferedImage image;
public static void main(String[] args) {
try {
image = ImageIO.read(new File("/path/to/image.png"));
System.out.println(image.getWidth() + "x" + image.getHeight());
PrinterJob pj = PrinterJob.getPrinterJob();
if (pj.printDialog()) {
PageFormat pf = pj.defaultPage();
Paper paper = pf.getPaper();
// 86X54mm
double width = fromCMToPPI(8.6);
double height = fromCMToPPI(5.4);
paper.setSize(width, height);
paper.setImageableArea(
fromCMToPPI(0.1),
fromCMToPPI(0.1),
width - fromCMToPPI(0.1),
height - fromCMToPPI(0.1));
pf.setOrientation(PageFormat.PORTRAIT);
pf.setPaper(paper);
PageFormat validatePage = pj.validatePage(pf);
System.out.println("Valid- " + dump(validatePage));
pj.setPrintable(new MyPrintable(), validatePage);
try {
pj.print();
} catch (PrinterException ex) {
ex.printStackTrace();
}
}
} catch (IOException exp) {
exp.printStackTrace();
}
}
protected static double fromPPItoCM(double dpi) {
return dpi / 72 / 0.393700787;
}
protected static double fromCMToPPI(double cm) {
return toPPI(cm * 0.393700787);
}
protected static double toPPI(double inch) {
return inch * 72d;
}
protected static String dump(Paper paper) {
StringBuilder sb = new StringBuilder(64);
sb.append(paper.getWidth()).append("x").append(paper.getHeight())
.append("/").append(paper.getImageableX()).append("x").
append(paper.getImageableY()).append(" - ").append(paper
.getImageableWidth()).append("x").append(paper.getImageableHeight());
return sb.toString();
}
protected static String dump(PageFormat pf) {
Paper paper = pf.getPaper();
return dump(paper);
}
public static class MyPrintable implements Printable {
@Override
public int print(Graphics graphics, PageFormat pageFormat,
int pageIndex) throws PrinterException {
System.out.println(pageIndex);
int result = NO_SUCH_PAGE;
if (pageIndex < 1) {
Graphics2D g2d = (Graphics2D) graphics;
System.out.println("[Print] " + dump(pageFormat));
double width = pageFormat.getImageableWidth();
double height = pageFormat.getImageableHeight();
System.out.println("Print Size = " + fromPPItoCM(width) + "x" + fromPPItoCM(height));
g2d.translate((int) pageFormat.getImageableX(),
(int) pageFormat.getImageableY());
Image scaled = null;
if (width > height) {
scaled = image.getScaledInstance((int)Math.round(width), -1, Image.SCALE_SMOOTH);
} else {
scaled = image.getScaledInstance(-1, (int)Math.round(height), Image.SCALE_SMOOTH);
}
g2d.drawImage(scaled, 0, 0, null);
result = PAGE_EXISTS;
}
return result;
}
}
}
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