qt-everywhere-src-5.14.1/qtquickcontrols2/src/imports/controls/qquickdefaultdial.cpp

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** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
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#include "qquickdefaultdial_p.h"

#include <QtCore/qmath.h>
#include <QtGui/qpainter.h>
#include <QtQuick/private/qquickitem_p.h>

QT_BEGIN_NAMESPACE

QQuickDefaultDial::QQuickDefaultDial(QQuickItem *parent) :
    QQuickPaintedItem(parent)
{
}

qreal QQuickDefaultDial::progress() const
{
    return m_progress;
}

void QQuickDefaultDial::setProgress(qreal progress)
{
    if (progress == m_progress)
        return;

    m_progress = progress;
    update();
}

QColor QQuickDefaultDial::color() const
{
    return m_color;
}

void QQuickDefaultDial::setColor(const QColor &color)
{
    if (color == m_color)
        return;

    m_color = color;
    update();
}

void QQuickDefaultDial::paint(QPainter *painter)
{
    if (width() <= 0 || height() <= 0)
        return;

    QPen pen(m_color);
    pen.setWidth(8);
    pen.setCapStyle(Qt::FlatCap);
    painter->setPen(pen);

    const QRectF bounds = boundingRect();
    const qreal smallest = qMin(bounds.width(), bounds.height());
    QRectF rect = QRectF(pen.widthF() / 2.0 + 1, pen.widthF() / 2.0 + 1, smallest - pen.widthF() - 2, smallest - pen.widthF() - 2);
    rect.moveCenter(bounds.center());

    // Make sure the arc is aligned to whole pixels.
    if (rect.x() - int(rect.x()) > 0)
        rect.setX(qCeil(rect.x()));
    if (rect.y() - int(rect.y()) > 0)
        rect.setY(qCeil(rect.y()));
    if (rect.width() - int(rect.width()) > 0)
        rect.setWidth(qFloor(rect.width()));
    if (rect.height() - int(rect.height()) > 0)
        rect.setHeight(qFloor(rect.height()));

    painter->setRenderHint(QPainter::Antialiasing);

    const qreal startAngle = (140 + 90);
    const qreal spanAngle = (m_progress * 280) * -1;
    QPainterPath path;
    path.arcMoveTo(rect, startAngle);
    path.arcTo(rect, startAngle, spanAngle);
    painter->drawPath(path);

    rect.adjust(-pen.widthF() / 2.0, -pen.widthF() / 2.0, pen.widthF() / 2.0, pen.widthF() / 2.0);
    pen.setWidth(1);
    painter->setPen(pen);

    path = QPainterPath();
    path.arcMoveTo(rect, 0);
    path.arcTo(rect, 0, 360);
    painter->drawPath(path);
}

QT_END_NAMESPACE