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List:       kde-edu
Subject:    Re: [kde-edu]: Need help with this code
From:       Kevin Krammer <kevin.krammer () gmx ! at>
Date:       2005-07-11 17:12:03
Message-ID: 200507111912.08542.kevin.krammer () gmx ! at
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On Monday 11 July 2005 16:02, Carsten Niehaus wrote:
> I am drawing a vertical line and then want to put a string below that
> line....
>
> =B7   =B7   p->drawLine( x,0,x, m_realHeight );
> =B7   =B7   p->save();
> =B7   =B7   p->rotate( -90.0 );
> =B7   =B7   p->translate( m_realHeight,0 );

You have to translate before you rotate.

See attached exampe.

Cheers,
Kevin

["qdrawtexttest.cpp" (text/x-c++src)]

#include <qapplication.h>
#include <qpainter.h>
#include <qwidget.h>


class Widget : public QWidget
{
public:
    Widget() : QWidget(0, "widget") {}
    
protected:
    virtual void paintEvent(QPaintEvent* event)
    {
        QPainter p(this);
        
        int x = rect().center().x();
        int y = rect().center().y();
        
        p.setPen(Qt::blue);
        p.drawLine(x, 0, x, height());
        p.drawLine(0, y, width(), y);
        
        // draw at center
        p.drawText(x, y, "Foo");
        
        // translate into center (center becomes (0, 0))
        p.translate(x, y);
        
        // rotate around new (0, 0) (former center)
        p.rotate(-90);
        
        // draw at (0, 0) (former center)
        p.setPen(Qt::red);
        p.drawText(0, 0, "Bar");
    }
};

int main(int argc, char** argv)
{
    QApplication app(argc, argv);

    Widget w;
    app.setMainWidget(&w);
    w.resize(200, 200);
    w.show();

    return app.exec();
}

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