qtbase/tests/manual/examples/blurpicker/blureffect.cpp

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include "blureffect.h"

#include <QDebug>

BlurEffect::BlurEffect(QGraphicsItem *item)
    : QGraphicsBlurEffect()
    , m_baseLine(200), item(item)
{
}

void BlurEffect::adjustForItem()
{
    qreal y = m_baseLine - item->pos().y();
    qreal radius = qBound(qreal(0.0), y / 32, qreal(16.0));
    setBlurRadius(radius);
}

QRectF BlurEffect::boundingRect() const
{
    const_cast<BlurEffect *>(this)->adjustForItem();
    return QGraphicsBlurEffect::boundingRect();
}

void BlurEffect::draw(QPainter *painter)
{
    adjustForItem();
    QGraphicsBlurEffect::draw(painter);
}