qt 6.5.1 original

examples/widgets/painting/transformations/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(transformations LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/painting/transformations")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(transformations
+    main.cpp
+    renderarea.cpp renderarea.h
+    window.cpp window.h
+)
+
+set_target_properties(transformations PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(transformations PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS transformations
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/painting/transformations/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+
+#include "window.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    Window window;
+    window.show();
+    return app.exec();
+}

examples/widgets/painting/transformations/renderarea.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "renderarea.h"
+
+#include <QPainter>
+#include <QPaintEvent>
+
+//! [0]
+RenderArea::RenderArea(QWidget *parent)
+    : QWidget(parent)
+{
+    QFont newFont = font();
+    newFont.setPixelSize(12);
+    setFont(newFont);
+
+    QFontMetrics fontMetrics(newFont);
+    xBoundingRect = fontMetrics.boundingRect(tr("x"));
+    yBoundingRect = fontMetrics.boundingRect(tr("y"));
+}
+//! [0]
+
+//! [1]
+void RenderArea::setOperations(const QList<Operation> &operations)
+{
+    this->operations = operations;
+    update();
+}
+//! [1]
+
+//! [2]
+void RenderArea::setShape(const QPainterPath &shape)
+{
+    this->shape = shape;
+    update();
+}
+//! [2]
+
+//! [3]
+QSize RenderArea::minimumSizeHint() const
+{
+    return QSize(182, 182);
+}
+//! [3]
+
+//! [4]
+QSize RenderArea::sizeHint() const
+{
+    return QSize(232, 232);
+}
+//! [4]
+
+//! [5]
+void RenderArea::paintEvent(QPaintEvent *event)
+{
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::Antialiasing);
+    painter.fillRect(event->rect(), QBrush(Qt::white));
+
+    painter.translate(66, 66);
+//! [5]
+
+//! [6]
+    painter.save();
+    transformPainter(painter);
+    drawShape(painter);
+    painter.restore();
+//! [6]
+
+//! [7]
+    drawOutline(painter);
+//! [7]
+
+//! [8]
+    transformPainter(painter);
+    drawCoordinates(painter);
+}
+//! [8]
+
+//! [9]
+void RenderArea::drawCoordinates(QPainter &painter)
+{
+    painter.setPen(Qt::red);
+
+    painter.drawLine(0, 0, 50, 0);
+    painter.drawLine(48, -2, 50, 0);
+    painter.drawLine(48, 2, 50, 0);
+    painter.drawText(60 - xBoundingRect.width() / 2,
+                     0 + xBoundingRect.height() / 2, tr("x"));
+
+    painter.drawLine(0, 0, 0, 50);
+    painter.drawLine(-2, 48, 0, 50);
+    painter.drawLine(2, 48, 0, 50);
+    painter.drawText(0 - yBoundingRect.width() / 2,
+                     60 + yBoundingRect.height() / 2, tr("y"));
+}
+//! [9]
+
+//! [10]
+void RenderArea::drawOutline(QPainter &painter)
+{
+    painter.setPen(Qt::darkGreen);
+    painter.setPen(Qt::DashLine);
+    painter.setBrush(Qt::NoBrush);
+    painter.drawRect(0, 0, 100, 100);
+}
+//! [10]
+
+//! [11]
+void RenderArea::drawShape(QPainter &painter)
+{
+    painter.fillPath(shape, Qt::blue);
+}
+//! [11]
+
+//! [12]
+void RenderArea::transformPainter(QPainter &painter)
+{
+    for (int i = 0; i < operations.size(); ++i) {
+        switch (operations[i]) {
+        case Translate:
+            painter.translate(50, 50);
+            break;
+        case Scale:
+            painter.scale(0.75, 0.75);
+            break;
+        case Rotate:
+            painter.rotate(60);
+            break;
+        case NoTransformation:
+        default:
+            ;
+        }
+    }
+}
+//! [12]

examples/widgets/painting/transformations/renderarea.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef RENDERAREA_H
+#define RENDERAREA_H
+
+#include <QList>
+#include <QPainterPath>
+#include <QRect>
+#include <QWidget>
+
+QT_BEGIN_NAMESPACE
+class QPaintEvent;
+QT_END_NAMESPACE
+
+//! [0]
+enum Operation { NoTransformation, Translate, Rotate, Scale };
+//! [0]
+
+//! [1]
+class RenderArea : public QWidget
+{
+    Q_OBJECT
+
+public:
+    RenderArea(QWidget *parent = nullptr);
+
+    void setOperations(const QList<Operation> &operations);
+    void setShape(const QPainterPath &shape);
+
+    QSize minimumSizeHint() const override;
+    QSize sizeHint() const override;
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+//! [1]
+
+//! [2]
+private:
+    void drawCoordinates(QPainter &painter);
+    void drawOutline(QPainter &painter);
+    void drawShape(QPainter &painter);
+    void transformPainter(QPainter &painter);
+
+    QList<Operation> operations;
+    QPainterPath shape;
+    QRect xBoundingRect;
+    QRect yBoundingRect;
+};
+//! [2]
+
+#endif // RENDERAREA_H

examples/widgets/painting/transformations/transformations.pro

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+QT += widgets
+requires(qtConfig(combobox))
+
+HEADERS     = renderarea.h \
+              window.h
+SOURCES     = main.cpp \
+              renderarea.cpp \
+	      window.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/painting/transformations
+INSTALLS += target

examples/widgets/painting/transformations/window.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "window.h"
+
+#include <QComboBox>
+#include <QGridLayout>
+
+//! [0]
+Window::Window()
+{
+    originalRenderArea = new RenderArea;
+
+    shapeComboBox = new QComboBox;
+    shapeComboBox->addItem(tr("Clock"));
+    shapeComboBox->addItem(tr("House"));
+    shapeComboBox->addItem(tr("Text"));
+    shapeComboBox->addItem(tr("Truck"));
+
+    QGridLayout *layout = new QGridLayout;
+    layout->addWidget(originalRenderArea, 0, 0);
+    layout->addWidget(shapeComboBox, 1, 0);
+//! [0]
+
+//! [1]
+    for (int i = 0; i < NumTransformedAreas; ++i) {
+        transformedRenderAreas[i] = new RenderArea;
+
+        operationComboBoxes[i] = new QComboBox;
+        operationComboBoxes[i]->addItem(tr("No transformation"));
+        operationComboBoxes[i]->addItem(tr("Rotate by 60\xC2\xB0"));
+        operationComboBoxes[i]->addItem(tr("Scale to 75%"));
+        operationComboBoxes[i]->addItem(tr("Translate by (50, 50)"));
+
+        connect(operationComboBoxes[i], &QComboBox::activated,
+                this, &Window::operationChanged);
+
+        layout->addWidget(transformedRenderAreas[i], 0, i + 1);
+        layout->addWidget(operationComboBoxes[i], 1, i + 1);
+    }
+//! [1]
+
+//! [2]
+    setLayout(layout);
+    setupShapes();
+    shapeSelected(0);
+
+    setWindowTitle(tr("Transformations"));
+}
+//! [2]
+
+//! [3]
+void Window::setupShapes()
+{
+    QPainterPath truck;
+//! [3]
+    truck.setFillRule(Qt::WindingFill);
+    truck.moveTo(0.0, 87.0);
+    truck.lineTo(0.0, 60.0);
+    truck.lineTo(10.0, 60.0);
+    truck.lineTo(35.0, 35.0);
+    truck.lineTo(100.0, 35.0);
+    truck.lineTo(100.0, 87.0);
+    truck.lineTo(0.0, 87.0);
+    truck.moveTo(17.0, 60.0);
+    truck.lineTo(55.0, 60.0);
+    truck.lineTo(55.0, 40.0);
+    truck.lineTo(37.0, 40.0);
+    truck.lineTo(17.0, 60.0);
+    truck.addEllipse(17.0, 75.0, 25.0, 25.0);
+    truck.addEllipse(63.0, 75.0, 25.0, 25.0);
+
+//! [4]
+    QPainterPath clock;
+//! [4]
+    clock.addEllipse(-50.0, -50.0, 100.0, 100.0);
+    clock.addEllipse(-48.0, -48.0, 96.0, 96.0);
+    clock.moveTo(0.0, 0.0);
+    clock.lineTo(-2.0, -2.0);
+    clock.lineTo(0.0, -42.0);
+    clock.lineTo(2.0, -2.0);
+    clock.lineTo(0.0, 0.0);
+    clock.moveTo(0.0, 0.0);
+    clock.lineTo(2.732, -0.732);
+    clock.lineTo(24.495, 14.142);
+    clock.lineTo(0.732, 2.732);
+    clock.lineTo(0.0, 0.0);
+
+//! [5]
+    QPainterPath house;
+//! [5]
+    house.moveTo(-45.0, -20.0);
+    house.lineTo(0.0, -45.0);
+    house.lineTo(45.0, -20.0);
+    house.lineTo(45.0, 45.0);
+    house.lineTo(-45.0, 45.0);
+    house.lineTo(-45.0, -20.0);
+    house.addRect(15.0, 5.0, 20.0, 35.0);
+    house.addRect(-35.0, -15.0, 25.0, 25.0);
+
+//! [6]
+    QPainterPath text;
+//! [6]
+    QFont font;
+    font.setPixelSize(50);
+    QRect fontBoundingRect = QFontMetrics(font).boundingRect(tr("Qt"));
+    text.addText(-QPointF(fontBoundingRect.center()), font, tr("Qt"));
+
+//! [7]
+    shapes.append(clock);
+    shapes.append(house);
+    shapes.append(text);
+    shapes.append(truck);
+
+    connect(shapeComboBox, &QComboBox::activated,
+            this, &Window::shapeSelected);
+}
+//! [7]
+
+//! [8]
+void Window::operationChanged()
+{
+    static const Operation operationTable[] = {
+        NoTransformation, Rotate, Scale, Translate
+    };
+
+    QList<Operation> operations;
+    for (int i = 0; i < NumTransformedAreas; ++i) {
+        int index = operationComboBoxes[i]->currentIndex();
+        operations.append(operationTable[index]);
+        transformedRenderAreas[i]->setOperations(operations);
+    }
+}
+//! [8]
+
+//! [9]
+void Window::shapeSelected(int index)
+{
+    QPainterPath shape = shapes[index];
+    originalRenderArea->setShape(shape);
+    for (int i = 0; i < NumTransformedAreas; ++i)
+        transformedRenderAreas[i]->setShape(shape);
+}
+//! [9]

examples/widgets/painting/transformations/window.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include "renderarea.h"
+
+#include <QList>
+#include <QPainterPath>
+#include <QWidget>
+
+QT_BEGIN_NAMESPACE
+class QComboBox;
+QT_END_NAMESPACE
+
+//! [0]
+class Window : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Window();
+
+public slots:
+    void operationChanged();
+    void shapeSelected(int index);
+//! [0]
+
+//! [1]
+private:
+    void setupShapes();
+
+    enum { NumTransformedAreas = 3 };
+    RenderArea *originalRenderArea;
+    RenderArea *transformedRenderAreas[NumTransformedAreas];
+    QComboBox *shapeComboBox;
+    QComboBox *operationComboBoxes[NumTransformedAreas];
+    QList<QPainterPath> shapes;
+};
+//! [1]
+
+#endif