我正在使用QPrinter用文本填充表单并将其打印在打印机上。
对于测试,我生成pdf文件以避免纸张和墨水浪费。 我发现PDF和实际印刷品的字体间距是不同的
最小示例:
#include <QApplication>
#include <QPrinter>
#include <QPrinterInfo>
#include <QPainter>
#include <QFontDatabase>
void printForm(bool pdf);
QString g_fontFamily = "";
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
int id = QFontDatabase::addApplicationFont(":/IBMPlexMono-Medium.ttf");
g_fontFamily = QFontDatabase::applicationFontFamilies(id).at(0);
printForm(true); //pdf
printForm(false); //physical printer
return a.exec();
}
void printForm(bool pdf)
{
//setup printer
QPrinter *printer;
if(pdf)
{
printer = new QPrinter(QPrinter::ScreenResolution);
printer->setOutputFormat(QPrinter::PdfFormat);
printer->setOutputFileName("./regular.pdf");
}
else
{
printer = new QPrinter(QPrinterInfo::defaultPrinter(), QPrinter::ScreenResolution);
printer->setOutputFormat(QPrinter::NativeFormat);
}
printer->setOrientation(QPrinter::Orientation::Landscape);
QPageSize customSize(QSizeF(105.0, 157.76), QPageSize::Millimeter, "", QPageSize::ExactMatch);
printer->setPageSize(customSize);
//draw background
QImage img(":/regular_transfer_form");
QPainter painter(printer);
painter.drawImage(QRect(0,0, printer->width(), printer->height()), img, QRect(0,0, img.width(), img.height()));
//draw text
painter.setPen(Qt::black);
QFont font(g_fontFamily, 11);
font.setStyleHint(QFont::TypeWriter);
font.setLetterSpacing(QFont::PercentageSpacing, 212);
painter.setFont(font);
QTextOption textOption(Qt::AlignVCenter | Qt::AlignLeft);
textOption.setWrapMode(QTextOption::NoWrap);
QString text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit";
QRectF relativeArea(0.05838, 0.0783, 0.8971, 0.04583); //coords relative to background
QRectF areaOnPaper(relativeArea.x() * printer->width(),
relativeArea.y() * printer->height(),
relativeArea.width() * printer->width(),
relativeArea.height() * printer->height()
);
painter.drawText(areaOnPaper, text, textOption); //draw 1-st line wit percentage Spacing
//set spacing to absolute
font.setLetterSpacing(QFont::AbsoluteSpacing, 10);
painter.setFont(font);
areaOnPaper.setRect(areaOnPaper.x(), areaOnPaper.y() + 28, areaOnPaper.width(), areaOnPaper.height());
painter.drawText(areaOnPaper, text, textOption); //draw 2-nd line wit absolute Spacing
}
结果:
如您所见-在纸上,字母不在框中,但两者的代码相同。
由于QPrinter documentation中的注释,我尝试使用QFont::PercentageSpacing
(第一行)和QFont::AbsoluteSpacing
(第二行)。没有成功。
我做错了什么还是Qt中存在错误?
在这两种情况下,有什么方法可以达到相同的结果吗?
github上带有背景图片和字体的完整示例