how can i draw rectanglar percentage?

Attachment 9434
I'd like to create a widget that present a percentage like above.
So, I use QPainterPath, and try to do that with "addRect" and "arcTo". But I can't get the willing result.
Attachment 9435
Maybe I'm not good at order of drawing, so I hope to someone tell me the way.

Hope this helps.
Attachment 9436

Code:

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#include <QtGlobal>
#include <QApplication>
 
#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
#include <QtWidgets>
#else
#include <QtGui>
#endif
 
#include "windows.h"
 
class ProgressRect : public QProgressBar
{
    Q_OBJECT
public:
    explicit ProgressRect(QWidget * parent = 0) : QProgressBar(parent) { }
 
protected:
    void paintEvent(QPaintEvent * event)
    {
        QPainter painter(this);
        int w = 0;
        int h = 0;
 
        QPen pen = painter.pen();
        pen.setWidth(1);
        pen.setColor(QColor(Qt::red));
 
        QBrush brush = painter.brush();
        brush.setColor(QColor(Qt::red));
        brush.setStyle(Qt::SolidPattern);
 
        // Paint red background rectangle
        painter.setPen(pen);
        painter.setBrush(brush);
        w = pen.width() / 2;
        painter.drawRect(event->rect().adjusted(w, w, -w, -w));
 
        // Paint green pie based on current value
        pen.setColor(Qt::green);
        brush.setColor(Qt::green);
        painter.setPen(pen);
        painter.setBrush(brush);
        h = event->rect().size().height();
        w = event->rect().size().width();
        w = qSqrt(h * h + w * w);
        QRect rect(0, 0, w, w);
        rect.moveCenter(event->rect().center());
        if(invertedAppearance())
            painter.drawPie(rect, 90 * 16, value() * 360 * 16 / 100);
        else
            painter.drawPie(rect, 90 * 16, -value() * 360 * 16 / 100);
 
        // Paint white rectangle to partially hide the pie
        pen.setColor(Qt::white);
        brush.setColor(Qt::white);
        painter.setPen(pen);
        painter.setBrush(brush);
        w = 20;
        if((event->rect().size().height() > w * 2) and (event->rect().size().width() > w * 2))
            painter.drawRect(event->rect().adjusted(w, w, -w, -w));
 
        // Paint the value in text in the centre
        pen.setColor(QColor(Qt::black));
        painter.setPen(pen);
        painter.drawText(event->rect(), QString::number(value()), QTextOption(Qt::AlignCenter));
    }
};
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    ProgressRect rect;
    rect.setMaximum(100);
    rect.setFixedSize(200, 200);
    rect.show();
 
    for(int i = 1; i <= 100; i++)
    {
        rect.setValue(i);
        qApp->processEvents();
        Sleep(100);
    }
 
    return 0;
}
 
#include "main.moc"

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Use clipping on the painter to obtain the result you want.

Thank you for your comment. But I hope that the white region to be transparent. :)

... and incomplete requirements are why software projects are notorious for being late ;)

What are you expecting to see in the transparent region?

I try to show splashscreen widget on my listView (icon based). So, I want to let the WIDGET shown up on item in listView.
I just want to see the item trough the transparent region. :o

Again -- use clipping to filter out what regions of the widget the draw operations modify.Then you can just draw a red rectangle and a green pie segment over it and you'll obtain the effect you want.

Quote:

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Thank you for your comment. But I hope that the white region to be transparent.

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Quote:

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I try to show splashscreen widget on my listView (icon based). So, I want to let the WIDGET shown up on item in listView.
I just want to see the item trough the transparent region.

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Ok then here it is again with transparent background.

Code:

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#include <QtGlobal>
#include <QApplication>
 
#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
#include <QtWidgets>
#else
#include <QtGui>
#endif
 
class ProgressRect : public QProgressBar
{
    Q_OBJECT
public:
    explicit ProgressRect(QWidget * parent = 0)
        : QProgressBar(parent)
        , mPenWidth(1)
    {
        setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
    }
 
protected:
    void resizeEvent(QResizeEvent * event)
    {
        QProgressBar::resizeEvent(event);
 
        int t = 20;
        int w = mPenWidth / 2;
 
        QRect outRect;
        QRect inRect;
 
        outRect.setSize(event->size());
        outRect.adjust(w, w, -w, -w);
 
        if((event->size().height() > (t * 2)) and (event->size().width() > (t * 2)))
            inRect = outRect.adjusted(t, t, -t, -t);
 
        // Set the clipping mask
        QRegion outRegion(outRect);
        QRegion inRegion(inRect);
        outRegion = outRegion.subtracted(inRegion);
        setMask(outRegion);
    }
 
    void paintEvent(QPaintEvent * event)
    {
        QPainter painter(this);
        int w = 0;
        int h = 0;
 
        QPen pen = painter.pen();
        pen.setWidth(mPenWidth);
        pen.setColor(QColor(Qt::red));
 
        QBrush brush = painter.brush();
        brush.setColor(QColor(Qt::red));
        brush.setStyle(Qt::SolidPattern);
 
        // Paint red background rectangle
        painter.setPen(pen);
        painter.setBrush(brush);
        w = pen.width() / 2;
        QRect outRect = event->rect().adjusted(w, w, -w, -w);
        painter.drawRect(outRect);
 
        // Paint green pie based on current value
        pen.setColor(Qt::green);
        brush.setColor(Qt::green);
        painter.setPen(pen);
        painter.setBrush(brush);
        h = event->rect().size().height();
        w = event->rect().size().width();
        w = qSqrt(h * h + w * w);
        QRect rect(0, 0, w, w);
        rect.moveCenter(event->rect().center());
        if(invertedAppearance())
            painter.drawPie(rect, 90 * 16, value() * 360 * 16 / 100);
        else
            painter.drawPie(rect, 90 * 16, -value() * 360 * 16 / 100);
    }
 
private:
    const int mPenWidth;
};
 
class Timer : public QObject
{
public:
    explicit Timer(QProgressBar * progress, QObject * parent = 0)
        : QObject(parent)
        , mProgress(progress)
        , mCount(0)
    {
        mProgress->setMaximum(100);
        mProgress->setValue(0);
        startTimer(100);
    }
 
protected:
    void timerEvent(QTimerEvent * event)
    {
        mCount++;
        mProgress->setValue(mCount);
 
        if(mCount == 100)
        {
            killTimer(event->timerId());
            deleteLater();
        }
    }
 
private:
    QProgressBar * const mProgress;
    int mCount;
};
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    QWidget widget;
    QHBoxLayout * layout = new QHBoxLayout(&widget);
    ProgressRect * rect = new ProgressRect;
    new Timer(rect, rect);
    layout->addWidget(rect);
    widget.showMaximized();
    return app.exec();
}
 
#include "main.moc"

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