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qt 6.5.1 original
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38
examples/widgets/painting/concentriccircles/CMakeLists.txt
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38
examples/widgets/painting/concentriccircles/CMakeLists.txt
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# Copyright (C) 2022 The Qt Company Ltd.
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# SPDX-License-Identifier: BSD-3-Clause
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cmake_minimum_required(VERSION 3.16)
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project(concentriccircles LANGUAGES CXX)
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if(NOT DEFINED INSTALL_EXAMPLESDIR)
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set(INSTALL_EXAMPLESDIR "examples")
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endif()
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set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/painting/concentriccircles")
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find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
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qt_standard_project_setup()
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qt_add_executable(concentriccircles
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circlewidget.cpp circlewidget.h
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main.cpp
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window.cpp window.h
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)
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set_target_properties(concentriccircles PROPERTIES
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WIN32_EXECUTABLE TRUE
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MACOSX_BUNDLE TRUE
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)
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target_link_libraries(concentriccircles PRIVATE
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Qt6::Core
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Qt6::Gui
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Qt6::Widgets
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)
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install(TARGETS concentriccircles
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RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
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BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
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LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
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)
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84
examples/widgets/painting/concentriccircles/circlewidget.cpp
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84
examples/widgets/painting/concentriccircles/circlewidget.cpp
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "circlewidget.h"
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#include <QPainter>
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#include <stdlib.h>
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//! [0]
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CircleWidget::CircleWidget(QWidget *parent)
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: QWidget(parent)
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{
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floatBased = false;
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antialiased = false;
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frameNo = 0;
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setBackgroundRole(QPalette::Base);
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setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
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}
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//! [0]
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//! [1]
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void CircleWidget::setFloatBased(bool floatBased)
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{
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this->floatBased = floatBased;
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update();
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}
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//! [1]
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//! [2]
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void CircleWidget::setAntialiased(bool antialiased)
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{
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this->antialiased = antialiased;
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update();
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}
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//! [2]
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//! [3]
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QSize CircleWidget::minimumSizeHint() const
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{
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return QSize(50, 50);
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}
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//! [3]
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//! [4]
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QSize CircleWidget::sizeHint() const
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{
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return QSize(180, 180);
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}
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//! [4]
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//! [5]
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void CircleWidget::nextAnimationFrame()
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{
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++frameNo;
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update();
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}
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//! [5]
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//! [6]
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void CircleWidget::paintEvent(QPaintEvent *)
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{
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing, antialiased);
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painter.translate(width() / 2, height() / 2);
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//! [6]
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//! [7]
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for (int diameter = 0; diameter < 256; diameter += 9) {
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int delta = abs((frameNo % 128) - diameter / 2);
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int alpha = 255 - (delta * delta) / 4 - diameter;
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//! [7] //! [8]
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if (alpha > 0) {
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painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3));
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if (floatBased)
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painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0, diameter, diameter));
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else
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painter.drawEllipse(QRect(-diameter / 2, -diameter / 2, diameter, diameter));
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}
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}
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}
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//! [8]
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36
examples/widgets/painting/concentriccircles/circlewidget.h
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36
examples/widgets/painting/concentriccircles/circlewidget.h
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#ifndef CIRCLEWIDGET_H
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#define CIRCLEWIDGET_H
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#include <QWidget>
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//! [0]
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class CircleWidget : public QWidget
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{
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Q_OBJECT
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public:
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CircleWidget(QWidget *parent = nullptr);
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void setFloatBased(bool floatBased);
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void setAntialiased(bool antialiased);
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QSize minimumSizeHint() const override;
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QSize sizeHint() const override;
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public slots:
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void nextAnimationFrame();
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protected:
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void paintEvent(QPaintEvent *event) override;
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private:
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bool floatBased;
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bool antialiased;
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int frameNo;
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};
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//! [0]
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#endif // CIRCLEWIDGET_H
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QT += widgets
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HEADERS = circlewidget.h \
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window.h
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SOURCES = circlewidget.cpp \
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main.cpp \
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window.cpp
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# install
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target.path = $$[QT_INSTALL_EXAMPLES]/widgets/painting/concentriccircles
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INSTALLS += target
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14
examples/widgets/painting/concentriccircles/main.cpp
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14
examples/widgets/painting/concentriccircles/main.cpp
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "window.h"
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#include <QApplication>
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int main(int argc, char *argv[])
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{
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QApplication app(argc, argv);
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Window window;
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window.show();
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return app.exec();
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}
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56
examples/widgets/painting/concentriccircles/window.cpp
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56
examples/widgets/painting/concentriccircles/window.cpp
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "circlewidget.h"
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#include "window.h"
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#include <QtWidgets>
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//! [0]
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Window::Window()
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{
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aliasedLabel = createLabel(tr("Aliased"));
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antialiasedLabel = createLabel(tr("Antialiased"));
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intLabel = createLabel(tr("Int"));
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floatLabel = createLabel(tr("Float"));
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QGridLayout *layout = new QGridLayout;
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layout->addWidget(aliasedLabel, 0, 1);
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layout->addWidget(antialiasedLabel, 0, 2);
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layout->addWidget(intLabel, 1, 0);
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layout->addWidget(floatLabel, 2, 0);
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//! [0]
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//! [1]
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QTimer *timer = new QTimer(this);
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for (int i = 0; i < 2; ++i) {
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for (int j = 0; j < 2; ++j) {
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circleWidgets[i][j] = new CircleWidget;
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circleWidgets[i][j]->setAntialiased(j != 0);
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circleWidgets[i][j]->setFloatBased(i != 0);
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connect(timer, &QTimer::timeout,
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circleWidgets[i][j], &CircleWidget::nextAnimationFrame);
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layout->addWidget(circleWidgets[i][j], i + 1, j + 1);
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}
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}
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//! [1] //! [2]
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timer->start(100);
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setLayout(layout);
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setWindowTitle(tr("Concentric Circles"));
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}
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//! [2]
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//! [3]
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QLabel *Window::createLabel(const QString &text)
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{
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QLabel *label = new QLabel(text);
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label->setAlignment(Qt::AlignCenter);
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label->setMargin(2);
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label->setFrameStyle(QFrame::Box | QFrame::Sunken);
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return label;
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}
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//! [3]
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examples/widgets/painting/concentriccircles/window.h
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33
examples/widgets/painting/concentriccircles/window.h
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#ifndef WINDOW_H
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#define WINDOW_H
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#include <QWidget>
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QT_BEGIN_NAMESPACE
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class QLabel;
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QT_END_NAMESPACE
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class CircleWidget;
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//! [0]
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class Window : public QWidget
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{
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Q_OBJECT
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public:
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Window();
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private:
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QLabel *createLabel(const QString &text);
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QLabel *aliasedLabel;
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QLabel *antialiasedLabel;
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QLabel *intLabel;
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QLabel *floatLabel;
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CircleWidget *circleWidgets[2][2];
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};
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//! [0]
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#endif // WINDOW_H
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