Draw vertical text

Vlad02

Hi everybody! I need draw vertical text with QPainter::drawText. For example, text "Hello" I need draw as:
H
e
l
l
o
But I don't know, how do this. Maybe somebody can give some good advices. Thanks in advance!

Christian Ehrlicher

This text is not drawn vertical but horizontal with a linebreak after each character. So add a linebreak after each character in your string you pass to QPainter::drawText()

Vlad02

@Christian-Ehrlicher So if I want draw number as text, I need convert int to string and edit it with insert linebreak?

JonB

@Vlad02
Absolutely yes! You always have to convert numbers to strings to print them!

Vlad02

@JonB Yes, I understand this. I am interesting edit this text. I need insert linebreaks in right places? And how I can do this easy?

JonB

@Vlad02

@Christian-Ehrlicher said in Draw vertical text:

So add a linebreak after each character in your string you pass to QPainter::drawText()

Vlad02

@JonB Okey, thanks for help! And @Christian-Ehrlicher thanks too

Vlad02

I'm sorry, ran into a problem. How I can insert linebreak after each character?

Christian Ehrlicher

@Vlad02 said in Draw vertical text:

How I can insert linebreak after each character?

Iterate over the string and create a new one where you add the character and a linebreak in each iteration. Basic programming stuff.

Vlad02

@Christian-Ehrlicher what if '\n' not work? I get that: "H\ne\nl\nl\no\n".

QString str;
    for (QChar ch : text){
        str.append(ch);
        str.append('\n');
    }

Christian Ehrlicher

What drawText() function do you use? Please read the documentation about one of them:

This function does not handle the newline character (\n), as it cannot break text into multiple lines, and it cannot display the newline character. Use the QPainter::drawText() overload that takes a rectangle instead if you want to draw multiple lines of text with the newline character, or if you want the text to be wrapped.

#include <QtWidgets>

class Widget : public QWidget
{
  void paintEvent(QPaintEvent *event) override
  {
    QPainter p(this);
    p.drawText(rect(), "T\ne\ns\nt");
  }
};

int main(int argc, char **argv)
{
  QApplication app(argc, argv);
  Widget w;
  w.resize(100,100);
  w.show();
  return app.exec();
}

Vlad02

@Christian-Ehrlicher Oh, thank you very very much!!! I'm sorry for wasting time!