qt 6.5.1 original

examples/widgets/painting/basicdrawing/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(basicdrawing LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/painting/basicdrawing")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(basicdrawing
+    main.cpp
+    renderarea.cpp renderarea.h
+    window.cpp window.h
+)
+
+set_target_properties(basicdrawing PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(basicdrawing PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+# Resources:
+set(basicdrawing_resource_files
+    "images/brick.png"
+    "images/qt-logo.png"
+)
+
+qt_add_resources(basicdrawing "basicdrawing"
+    PREFIX
+        "/"
+    FILES
+        ${basicdrawing_resource_files}
+)
+
+install(TARGETS basicdrawing
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/painting/basicdrawing/basicdrawing.pro

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

examples/widgets/painting/basicdrawing/basicdrawing.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>images/brick.png</file>
+    <file>images/qt-logo.png</file>
+</qresource>
+</RCC>

examples/widgets/painting/basicdrawing/main.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 <QApplication>
+
+int main(int argc, char *argv[])
+{
+    Q_INIT_RESOURCE(basicdrawing);
+
+    QApplication app(argc, argv);
+    Window window;
+    window.show();
+    return app.exec();
+}

examples/widgets/painting/basicdrawing/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 <QPainterPath>
+
+//! [0]
+RenderArea::RenderArea(QWidget *parent)
+    : QWidget(parent)
+{
+    shape = Polygon;
+    antialiased = false;
+    transformed = false;
+    pixmap.load(":/images/qt-logo.png");
+
+    setBackgroundRole(QPalette::Base);
+    setAutoFillBackground(true);
+}
+//! [0]
+
+//! [1]
+QSize RenderArea::minimumSizeHint() const
+{
+    return QSize(100, 100);
+}
+//! [1]
+
+//! [2]
+QSize RenderArea::sizeHint() const
+{
+    return QSize(400, 200);
+}
+//! [2]
+
+//! [3]
+void RenderArea::setShape(Shape shape)
+{
+    this->shape = shape;
+    update();
+}
+//! [3]
+
+//! [4]
+void RenderArea::setPen(const QPen &pen)
+{
+    this->pen = pen;
+    update();
+}
+//! [4]
+
+//! [5]
+void RenderArea::setBrush(const QBrush &brush)
+{
+    this->brush = brush;
+    update();
+}
+//! [5]
+
+//! [6]
+void RenderArea::setAntialiased(bool antialiased)
+{
+    this->antialiased = antialiased;
+    update();
+}
+//! [6]
+
+//! [7]
+void RenderArea::setTransformed(bool transformed)
+{
+    this->transformed = transformed;
+    update();
+}
+//! [7]
+
+//! [8]
+void RenderArea::paintEvent(QPaintEvent * /* event */)
+{
+    static const QPoint points[4] = {
+        QPoint(10, 80),
+        QPoint(20, 10),
+        QPoint(80, 30),
+        QPoint(90, 70)
+    };
+
+    QRect rect(10, 20, 80, 60);
+
+    QPainterPath path;
+    path.moveTo(20, 80);
+    path.lineTo(20, 30);
+    path.cubicTo(80, 0, 50, 50, 80, 80);
+
+    int startAngle = 20 * 16;
+    int arcLength = 120 * 16;
+//! [8]
+
+//! [9]
+    QPainter painter(this);
+    painter.setPen(pen);
+    painter.setBrush(brush);
+    if (antialiased)
+        painter.setRenderHint(QPainter::Antialiasing, true);
+//! [9]
+
+//! [10]
+    for (int x = 0; x < width(); x += 100) {
+        for (int y = 0; y < height(); y += 100) {
+            painter.save();
+            painter.translate(x, y);
+//! [10] //! [11]
+            if (transformed) {
+                painter.translate(50, 50);
+                painter.rotate(60.0);
+                painter.scale(0.6, 0.9);
+                painter.translate(-50, -50);
+            }
+//! [11]
+
+//! [12]
+            switch (shape) {
+            case Line:
+                painter.drawLine(rect.bottomLeft(), rect.topRight());
+                break;
+            case Points:
+                painter.drawPoints(points, 4);
+                break;
+            case Polyline:
+                painter.drawPolyline(points, 4);
+                break;
+            case Polygon:
+                painter.drawPolygon(points, 4);
+                break;
+            case Rect:
+                painter.drawRect(rect);
+                break;
+            case RoundedRect:
+                painter.drawRoundedRect(rect, 25, 25, Qt::RelativeSize);
+                break;
+            case Ellipse:
+                painter.drawEllipse(rect);
+                break;
+            case Arc:
+                painter.drawArc(rect, startAngle, arcLength);
+                break;
+            case Chord:
+                painter.drawChord(rect, startAngle, arcLength);
+                break;
+            case Pie:
+                painter.drawPie(rect, startAngle, arcLength);
+                break;
+            case Path:
+                painter.drawPath(path);
+                break;
+            case Text:
+                painter.drawText(rect,
+                                 Qt::AlignCenter,
+                                 tr("Qt by\nThe Qt Company"));
+                break;
+            case Pixmap:
+                painter.drawPixmap(10, 10, pixmap);
+            }
+//! [12] //! [13]
+            painter.restore();
+        }
+    }
+
+    painter.setRenderHint(QPainter::Antialiasing, false);
+    painter.setPen(palette().dark().color());
+    painter.setBrush(Qt::NoBrush);
+    painter.drawRect(QRect(0, 0, width() - 1, height() - 1));
+}
+//! [13]

examples/widgets/painting/basicdrawing/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 <QBrush>
+#include <QPen>
+#include <QPixmap>
+#include <QWidget>
+
+//! [0]
+class RenderArea : public QWidget
+{
+    Q_OBJECT
+
+public:
+    enum Shape { Line, Points, Polyline, Polygon, Rect, RoundedRect, Ellipse, Arc,
+                 Chord, Pie, Path, Text, Pixmap };
+
+    explicit RenderArea(QWidget *parent = nullptr);
+
+    QSize minimumSizeHint() const override;
+    QSize sizeHint() const override;
+
+public slots:
+    void setShape(Shape shape);
+    void setPen(const QPen &pen);
+    void setBrush(const QBrush &brush);
+    void setAntialiased(bool antialiased);
+    void setTransformed(bool transformed);
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+
+private:
+    Shape shape;
+    QPen pen;
+    QBrush brush;
+    bool antialiased;
+    bool transformed;
+    QPixmap pixmap;
+};
+//! [0]
+
+#endif // RENDERAREA_H

examples/widgets/painting/basicdrawing/window.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 "window.h"
+
+#include <QtWidgets>
+
+//! [0]
+const int IdRole = Qt::UserRole;
+//! [0]
+
+//! [1]
+Window::Window()
+{
+    renderArea = new RenderArea;
+
+    shapeComboBox = new QComboBox;
+    shapeComboBox->addItem(tr("Polygon"), RenderArea::Polygon);
+    shapeComboBox->addItem(tr("Rectangle"), RenderArea::Rect);
+    shapeComboBox->addItem(tr("Rounded Rectangle"), RenderArea::RoundedRect);
+    shapeComboBox->addItem(tr("Ellipse"), RenderArea::Ellipse);
+    shapeComboBox->addItem(tr("Pie"), RenderArea::Pie);
+    shapeComboBox->addItem(tr("Chord"), RenderArea::Chord);
+    shapeComboBox->addItem(tr("Path"), RenderArea::Path);
+    shapeComboBox->addItem(tr("Line"), RenderArea::Line);
+    shapeComboBox->addItem(tr("Polyline"), RenderArea::Polyline);
+    shapeComboBox->addItem(tr("Arc"), RenderArea::Arc);
+    shapeComboBox->addItem(tr("Points"), RenderArea::Points);
+    shapeComboBox->addItem(tr("Text"), RenderArea::Text);
+    shapeComboBox->addItem(tr("Pixmap"), RenderArea::Pixmap);
+
+    shapeLabel = new QLabel(tr("&Shape:"));
+    shapeLabel->setBuddy(shapeComboBox);
+//! [1]
+
+//! [2]
+    penWidthSpinBox = new QSpinBox;
+    penWidthSpinBox->setRange(0, 20);
+    penWidthSpinBox->setSpecialValueText(tr("0 (cosmetic pen)"));
+
+    penWidthLabel = new QLabel(tr("Pen &Width:"));
+    penWidthLabel->setBuddy(penWidthSpinBox);
+//! [2]
+
+//! [3]
+    penStyleComboBox = new QComboBox;
+    penStyleComboBox->addItem(tr("Solid"), static_cast<int>(Qt::SolidLine));
+    penStyleComboBox->addItem(tr("Dash"), static_cast<int>(Qt::DashLine));
+    penStyleComboBox->addItem(tr("Dot"), static_cast<int>(Qt::DotLine));
+    penStyleComboBox->addItem(tr("Dash Dot"), static_cast<int>(Qt::DashDotLine));
+    penStyleComboBox->addItem(tr("Dash Dot Dot"), static_cast<int>(Qt::DashDotDotLine));
+    penStyleComboBox->addItem(tr("None"), static_cast<int>(Qt::NoPen));
+
+    penStyleLabel = new QLabel(tr("&Pen Style:"));
+    penStyleLabel->setBuddy(penStyleComboBox);
+
+    penCapComboBox = new QComboBox;
+    penCapComboBox->addItem(tr("Flat"), Qt::FlatCap);
+    penCapComboBox->addItem(tr("Square"), Qt::SquareCap);
+    penCapComboBox->addItem(tr("Round"), Qt::RoundCap);
+
+    penCapLabel = new QLabel(tr("Pen &Cap:"));
+    penCapLabel->setBuddy(penCapComboBox);
+
+    penJoinComboBox = new QComboBox;
+    penJoinComboBox->addItem(tr("Miter"), Qt::MiterJoin);
+    penJoinComboBox->addItem(tr("Bevel"), Qt::BevelJoin);
+    penJoinComboBox->addItem(tr("Round"), Qt::RoundJoin);
+
+    penJoinLabel = new QLabel(tr("Pen &Join:"));
+    penJoinLabel->setBuddy(penJoinComboBox);
+//! [3]
+
+//! [4]
+    brushStyleComboBox = new QComboBox;
+    brushStyleComboBox->addItem(tr("Linear Gradient"),
+            static_cast<int>(Qt::LinearGradientPattern));
+    brushStyleComboBox->addItem(tr("Radial Gradient"),
+            static_cast<int>(Qt::RadialGradientPattern));
+    brushStyleComboBox->addItem(tr("Conical Gradient"),
+            static_cast<int>(Qt::ConicalGradientPattern));
+    brushStyleComboBox->addItem(tr("Texture"), static_cast<int>(Qt::TexturePattern));
+    brushStyleComboBox->addItem(tr("Solid"), static_cast<int>(Qt::SolidPattern));
+    brushStyleComboBox->addItem(tr("Horizontal"), static_cast<int>(Qt::HorPattern));
+    brushStyleComboBox->addItem(tr("Vertical"), static_cast<int>(Qt::VerPattern));
+    brushStyleComboBox->addItem(tr("Cross"), static_cast<int>(Qt::CrossPattern));
+    brushStyleComboBox->addItem(tr("Backward Diagonal"), static_cast<int>(Qt::BDiagPattern));
+    brushStyleComboBox->addItem(tr("Forward Diagonal"), static_cast<int>(Qt::FDiagPattern));
+    brushStyleComboBox->addItem(tr("Diagonal Cross"), static_cast<int>(Qt::DiagCrossPattern));
+    brushStyleComboBox->addItem(tr("Dense 1"), static_cast<int>(Qt::Dense1Pattern));
+    brushStyleComboBox->addItem(tr("Dense 2"), static_cast<int>(Qt::Dense2Pattern));
+    brushStyleComboBox->addItem(tr("Dense 3"), static_cast<int>(Qt::Dense3Pattern));
+    brushStyleComboBox->addItem(tr("Dense 4"), static_cast<int>(Qt::Dense4Pattern));
+    brushStyleComboBox->addItem(tr("Dense 5"), static_cast<int>(Qt::Dense5Pattern));
+    brushStyleComboBox->addItem(tr("Dense 6"), static_cast<int>(Qt::Dense6Pattern));
+    brushStyleComboBox->addItem(tr("Dense 7"), static_cast<int>(Qt::Dense7Pattern));
+    brushStyleComboBox->addItem(tr("None"), static_cast<int>(Qt::NoBrush));
+
+    brushStyleLabel = new QLabel(tr("&Brush:"));
+    brushStyleLabel->setBuddy(brushStyleComboBox);
+//! [4]
+
+//! [5]
+    otherOptionsLabel = new QLabel(tr("Options:"));
+//! [5] //! [6]
+    antialiasingCheckBox = new QCheckBox(tr("&Antialiasing"));
+//! [6] //! [7]
+    transformationsCheckBox = new QCheckBox(tr("&Transformations"));
+//! [7]
+
+//! [8]
+    connect(shapeComboBox, &QComboBox::activated,
+            this, &Window::shapeChanged);
+    connect(penWidthSpinBox, &QSpinBox::valueChanged,
+            this, &Window::penChanged);
+    connect(penStyleComboBox, &QComboBox::activated,
+            this, &Window::penChanged);
+    connect(penCapComboBox, &QComboBox::activated,
+            this, &Window::penChanged);
+    connect(penJoinComboBox, &QComboBox::activated,
+            this, &Window::penChanged);
+    connect(brushStyleComboBox, &QComboBox::activated,
+            this, &Window::brushChanged);
+    connect(antialiasingCheckBox, &QAbstractButton::toggled,
+            renderArea, &RenderArea::setAntialiased);
+    connect(transformationsCheckBox, &QAbstractButton::toggled,
+            renderArea, &RenderArea::setTransformed);
+//! [8]
+
+//! [9]
+    QGridLayout *mainLayout = new QGridLayout;
+//! [9] //! [10]
+    mainLayout->setColumnStretch(0, 1);
+    mainLayout->setColumnStretch(3, 1);
+    mainLayout->addWidget(renderArea, 0, 0, 1, 4);
+    mainLayout->addWidget(shapeLabel, 2, 0, Qt::AlignRight);
+    mainLayout->addWidget(shapeComboBox, 2, 1);
+    mainLayout->addWidget(penWidthLabel, 3, 0, Qt::AlignRight);
+    mainLayout->addWidget(penWidthSpinBox, 3, 1);
+    mainLayout->addWidget(penStyleLabel, 4, 0, Qt::AlignRight);
+    mainLayout->addWidget(penStyleComboBox, 4, 1);
+    mainLayout->addWidget(penCapLabel, 3, 2, Qt::AlignRight);
+    mainLayout->addWidget(penCapComboBox, 3, 3);
+    mainLayout->addWidget(penJoinLabel, 2, 2, Qt::AlignRight);
+    mainLayout->addWidget(penJoinComboBox, 2, 3);
+    mainLayout->addWidget(brushStyleLabel, 4, 2, Qt::AlignRight);
+    mainLayout->addWidget(brushStyleComboBox, 4, 3);
+    mainLayout->addWidget(otherOptionsLabel, 5, 0, Qt::AlignRight);
+    mainLayout->addWidget(antialiasingCheckBox, 5, 1, 1, 1, Qt::AlignRight);
+    mainLayout->addWidget(transformationsCheckBox, 5, 2, 1, 2, Qt::AlignRight);
+    setLayout(mainLayout);
+
+    shapeChanged();
+    penChanged();
+    brushChanged();
+    antialiasingCheckBox->setChecked(true);
+
+    setWindowTitle(tr("Basic Drawing"));
+}
+//! [10]
+
+//! [11]
+void Window::shapeChanged()
+{
+    RenderArea::Shape shape = RenderArea::Shape(shapeComboBox->itemData(
+            shapeComboBox->currentIndex(), IdRole).toInt());
+    renderArea->setShape(shape);
+}
+//! [11]
+
+//! [12]
+void Window::penChanged()
+{
+    int width = penWidthSpinBox->value();
+    Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(
+            penStyleComboBox->currentIndex(), IdRole).toInt());
+    Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(
+            penCapComboBox->currentIndex(), IdRole).toInt());
+    Qt::PenJoinStyle join = Qt::PenJoinStyle(penJoinComboBox->itemData(
+            penJoinComboBox->currentIndex(), IdRole).toInt());
+
+    renderArea->setPen(QPen(Qt::blue, width, style, cap, join));
+}
+//! [12]
+
+//! [13]
+void Window::brushChanged()
+{
+    Qt::BrushStyle style = Qt::BrushStyle(brushStyleComboBox->itemData(
+//! [13]
+            brushStyleComboBox->currentIndex(), IdRole).toInt());
+
+//! [14]
+    if (style == Qt::LinearGradientPattern) {
+        QLinearGradient linearGradient(0, 0, 100, 100);
+        linearGradient.setColorAt(0.0, Qt::white);
+        linearGradient.setColorAt(0.2, Qt::green);
+        linearGradient.setColorAt(1.0, Qt::black);
+        renderArea->setBrush(linearGradient);
+//! [14] //! [15]
+    } else if (style == Qt::RadialGradientPattern) {
+        QRadialGradient radialGradient(50, 50, 50, 70, 70);
+        radialGradient.setColorAt(0.0, Qt::white);
+        radialGradient.setColorAt(0.2, Qt::green);
+        radialGradient.setColorAt(1.0, Qt::black);
+        renderArea->setBrush(radialGradient);
+    } else if (style == Qt::ConicalGradientPattern) {
+        QConicalGradient conicalGradient(50, 50, 150);
+        conicalGradient.setColorAt(0.0, Qt::white);
+        conicalGradient.setColorAt(0.2, Qt::green);
+        conicalGradient.setColorAt(1.0, Qt::black);
+        renderArea->setBrush(conicalGradient);
+//! [15] //! [16]
+    } else if (style == Qt::TexturePattern) {
+        renderArea->setBrush(QBrush(QPixmap(":/images/brick.png")));
+//! [16] //! [17]
+    } else {
+        renderArea->setBrush(QBrush(Qt::green, style));
+    }
+}
+//! [17]

examples/widgets/painting/basicdrawing/window.h

@@ -0,0 +1,50 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include <QWidget>
+
+QT_BEGIN_NAMESPACE
+class QCheckBox;
+class QComboBox;
+class QLabel;
+class QSpinBox;
+QT_END_NAMESPACE
+class RenderArea;
+
+//! [0]
+class Window : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Window();
+
+private slots:
+    void shapeChanged();
+    void penChanged();
+    void brushChanged();
+
+private:
+    RenderArea *renderArea;
+    QLabel *shapeLabel;
+    QLabel *penWidthLabel;
+    QLabel *penStyleLabel;
+    QLabel *penCapLabel;
+    QLabel *penJoinLabel;
+    QLabel *brushStyleLabel;
+    QLabel *otherOptionsLabel;
+    QComboBox *shapeComboBox;
+    QSpinBox *penWidthSpinBox;
+    QComboBox *penStyleComboBox;
+    QComboBox *penCapComboBox;
+    QComboBox *penJoinComboBox;
+    QComboBox *brushStyleComboBox;
+    QCheckBox *antialiasingCheckBox;
+    QCheckBox *transformationsCheckBox;
+};
+//! [0]
+
+#endif // WINDOW_H