我试图打印一个带有一些画图形的JPanel(覆盖paintComponent)。图形非常大,不适合放在单个页面上,因此我让它跨越多个页面。使用java打印时,如何获得纸张的边距?
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
PageFormat pf = printJob.pageDialog(aset);
printJob.setPrintable(canvas, pf);
当我在我的JPanel类我不能写我的print()方法(实现打印):我的问题通过调用在于这样的事实,如果我让用户选择的PageFormat /纸张类型中似乎获得了利润率?我使用graphics.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
使它开始绘制在正确的全角(0; 0),它考虑了边距(即从(80; 100)左右开始)。但是,它会在底部和右侧边距上打印,因为这会否定用户的愿望,所以我不想这样做。
这里是(使用默认代替)在我的print()方法作为参考,当你没有让用户设置纸张的正常工作的代码:
Rectangle[] pageBreaks;
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
//Calculate how many pages our print will be
if(pageBreaks == null){
double pageWidth = pageFormat.getPaper().getWidth();
double pageHeight = pageFormat.getPaper().getHeight();
//Find out how many pages we need
int numberOfPagesHigh = (int) Math.ceil(size.getHeight()/pageHeight);
int numberOfPagesWide = (int) Math.ceil(size.getWidth()/pageWidth);
pageBreaks = new Rectangle[numberOfPagesHigh*numberOfPagesWide];
double x = 0;
double y = 0;
int curXPage = 0;
//Calculate what we will print on each page
for (int i = 0; i < pageBreaks.length; i++){
double xStart = x;
double yStart = y;
x += pageWidth;
pageBreaks[i] = new Rectangle((int)xStart, (int)yStart, (int)pageWidth, (int)pageHeight);
curXPage++;
if (curXPage > numberOfPagesWide){
curXPage = 0;
x = 0;
y += pageHeight;
}
}
}
if (pageIndex < pageBreaks.length){
//Cast graphics to Graphics2D for richer API
Graphics2D g2d = (Graphics2D) graphics;
//Translate into position of the paper
g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
//Setup our current page
Rectangle rect = pageBreaks[pageIndex];
g2d.translate(-rect.x, -rect.y);
g2d.setClip(rect.x, rect.y, rect.width, rect.height);
//Paint the component on the graphics object
Color oldBG = this.getBackground();
this.setBackground(Color.white);
util.PrintUtilities.disableDoubleBuffering(this);
this.paintComponent(g2d);
util.PrintUtilities.enableDoubleBuffering(this);
this.setBackground(oldBG);
//Return
return PAGE_EXISTS;
}
else {
return NO_SUCH_PAGE;
}
}