如何打印具有文本和图形的 QGraphicsScene [英] how to print a QGraphicsScene that has text and graphics

问题描述

我有一个 QGraphicsScene，上面有图形和文字.当我尝试打印时，图形很好，但是文本使用的是以磅为单位定义的字体大小，因此当我将它传递给 QPainterscene->render()> 用 QPrinter 初始化，有非常大的文本.

I have a QGraphicsScene that has graphics as well as text drawn on it. When I try to print, the graphics are fine, but the text is using a font size defined in points, so scene->render() when I pass it a QPainter initialized with a QPrinter, has VERY large text.

我应该如何打印带有文本的 QGraphicsScene?

How am I supposed to print a QGraphicsScene that has text on it?

这是我当前的打印代码，其中 scene_ 是我自定义的 QGraphicsScene 子类:

Here is my current printing code, where scene_ is my custom subclass of QGraphicsScene:

  QPrinter printer(QPrinter::HighResolution);
  QPrintDialog dialog(&printer, this);
  dialog.exec();
  std::cout << printer.resolution() << std::endl;
  QPainter painter(&printer);
  scene_->render(&painter);

std:cout 行似乎没有任何区别.打印机仍然认为文本很大，因此对于每个文本项，只打印了第一个字母的一小部分.

The std:cout line doesn't appear to make any difference. The printer still thinks the text is huge, so for each text item only a tiny part of the first letter is printed.

推荐答案

来自 QPrinter docs 听起来您必须以像素为单位指定字体大小才能使文本和图形匹配.请注意，QFont 有一个 setPixelSize 方法.

From the QPrinter docs it sounds like you have to specify font sizes in pixels to get text and graphics to match up. Note that QFont has a setPixelSize method.

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