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Diffstat (limited to 'examples/widgets/painting/concentriccircles/circlewidget.cpp')
-rw-r--r-- | examples/widgets/painting/concentriccircles/circlewidget.cpp | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/examples/widgets/painting/concentriccircles/circlewidget.cpp b/examples/widgets/painting/concentriccircles/circlewidget.cpp deleted file mode 100644 index febaa5d709..0000000000 --- a/examples/widgets/painting/concentriccircles/circlewidget.cpp +++ /dev/null @@ -1,84 +0,0 @@ -// Copyright (C) 2016 The Qt Company Ltd. -// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause - -#include "circlewidget.h" - -#include <QPainter> - -#include <stdlib.h> - -//! [0] -CircleWidget::CircleWidget(QWidget *parent) - : QWidget(parent) -{ - floatBased = false; - antialiased = false; - frameNo = 0; - - setBackgroundRole(QPalette::Base); - setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); -} -//! [0] - -//! [1] -void CircleWidget::setFloatBased(bool floatBased) -{ - this->floatBased = floatBased; - update(); -} -//! [1] - -//! [2] -void CircleWidget::setAntialiased(bool antialiased) -{ - this->antialiased = antialiased; - update(); -} -//! [2] - -//! [3] -QSize CircleWidget::minimumSizeHint() const -{ - return QSize(50, 50); -} -//! [3] - -//! [4] -QSize CircleWidget::sizeHint() const -{ - return QSize(180, 180); -} -//! [4] - -//! [5] -void CircleWidget::nextAnimationFrame() -{ - ++frameNo; - update(); -} -//! [5] - -//! [6] -void CircleWidget::paintEvent(QPaintEvent *) -{ - QPainter painter(this); - painter.setRenderHint(QPainter::Antialiasing, antialiased); - painter.translate(width() / 2, height() / 2); -//! [6] - -//! [7] - for (int diameter = 0; diameter < 256; diameter += 9) { - int delta = abs((frameNo % 128) - diameter / 2); - int alpha = 255 - (delta * delta) / 4 - diameter; -//! [7] //! [8] - if (alpha > 0) { - painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3)); - - if (floatBased) - painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0, diameter, diameter)); - else - painter.drawEllipse(QRect(-diameter / 2, -diameter / 2, diameter, diameter)); - } - } -} -//! [8] |