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QPainter::drawLine and QPainter::drawText with different color issue in Qt

Tags:

qt

I am facing problem for drawing line and text with different color using QPainter. I am using the following piece of code to achieve this but it's not working. Both lines and texts are drawn using the color set for drawing Text.

void MyWidget::drawHorLinesWithText(QPainter & painter, const QRect & rect)
{  
    for(int i=0; i < 5; i++)
    {
        QPen penHLines(QColor("#0e5a77"), 1, Qt::DotLine, Qt::FlatCap, Qt::RoundJoin);
        painter.setPen(penHLines);
        painter.drawLine(10, 50 - (5*(i+1)), 200, 50 - (5*(i+1)));

        QString strNumber = QString::number((2)*(i+1));

        painter.setFont(QFont("Arial", 8, QFont::Bold));
        //QBrush brush(QColor("#00e0fc"));
        //painter.setBrush(brush);
        QPen penHText(QColor("#00e0fc"));//Here lines are also drawn using this color
        painter.setPen(penHText);
        painter.drawText(5, 50 - (5*(i+1)) - 10), 20, 30, Qt::AlignHCenter | Qt::AlignVCenter,
                         strNumber);
    }
}

How would I set different colors for drawing lines and Texts. Any suggestions. Thanks.

like image 894
Rajeev Sahu Avatar asked Feb 28 '12 14:02

Rajeev Sahu


1 Answers

This works for me with Qt 5.3; perhaps it was a bug in the version you were using?

#include <QtWidgets>

class Widget : public QWidget
{
public:
    Widget() {
        resize(200, 200);
    }

    void paintEvent(QPaintEvent *) {
        QPainter painter(this);
        for(int i=0; i < 5; i++)
        {
            QPen penHLines(QColor("#0e5a77"), 10, Qt::DotLine, Qt::FlatCap, Qt::RoundJoin);
            painter.setPen(penHLines);
            painter.drawLine(10, 50 - (5*(i+1)), 200, 50 - (5*(i+1)));

            QString strNumber = QString::number((2)*(i+1));

            painter.setFont(QFont("Arial", 8, QFont::Bold));
            QPen penHText(QColor("#00e0fc"));
            painter.setPen(penHText);
            painter.drawText(5, 50 - (5*(i+1)) - 10, 20, 30, Qt::AlignHCenter | Qt::AlignVCenter, strNumber);
        }
    }
};

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

I increased the line width to 10 to see what's going on:

qpainter

like image 189
Mitch Avatar answered Nov 16 '22 02:11

Mitch