qt 6.5.1 original

examples/widgets/touch/pinchzoom/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(pinchzoom LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/touch/pinchzoom")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(pinchzoom
+    graphicsview.cpp graphicsview.h
+    main.cpp
+    mouse.cpp mouse.h
+)
+
+set_target_properties(pinchzoom PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(pinchzoom PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+# Resources:
+set(mice_resource_files
+    "images/cheese.jpg"
+)
+
+qt_add_resources(pinchzoom "mice"
+    PREFIX
+        "/"
+    FILES
+        ${mice_resource_files}
+)
+
+install(TARGETS pinchzoom
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/touch/pinchzoom/doc/src/pinchzoom.qdoc

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+
+/*!
+    \example touch/pinchzoom
+    \title Pinch Zoom Example
+    \ingroup touchinputexamples
+    \brief Shows how to recognize a gesture.
+
+    The Pinch Zoom example shows how to use low-level touch information
+    to recognize a gesture.
+
+    \image touch-pinchzoom-example.png
+*/

examples/widgets/touch/pinchzoom/graphicsview.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "graphicsview.h"
+
+#include <QScrollBar>
+#include <QTouchEvent>
+
+GraphicsView::GraphicsView(QGraphicsScene *scene, QWidget *parent)
+    : QGraphicsView(scene, parent)
+{
+    viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
+    setDragMode(ScrollHandDrag);
+}
+
+bool GraphicsView::viewportEvent(QEvent *event)
+{
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+    case QEvent::TouchUpdate:
+    case QEvent::TouchEnd:
+    {
+        QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
+        const auto touchPoints = touchEvent->points();
+        if (touchPoints.count() == 2) {
+            // determine scale factor
+            const QEventPoint &touchPoint0 = touchPoints.first();
+            const QEventPoint &touchPoint1 = touchPoints.last();
+            qreal currentScaleFactor =
+                    QLineF(touchPoint0.position(), touchPoint1.position()).length()
+                    / QLineF(touchPoint0.pressPosition(), touchPoint1.pressPosition()).length();
+            if (touchEvent->touchPointStates() & QEventPoint::Released) {
+                // if one of the fingers is released, remember the current scale
+                // factor so that adding another finger later will continue zooming
+                // by adding new scale factor to the existing remembered value.
+                totalScaleFactor *= currentScaleFactor;
+                currentScaleFactor = 1;
+            }
+            setTransform(QTransform::fromScale(totalScaleFactor * currentScaleFactor,
+                                               totalScaleFactor * currentScaleFactor));
+        }
+        return true;
+    }
+    default:
+        break;
+    }
+    return QGraphicsView::viewportEvent(event);
+}

examples/widgets/touch/pinchzoom/graphicsview.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#pragma once
+#include <QGraphicsView>
+
+class GraphicsView : public QGraphicsView
+{
+    Q_OBJECT
+
+public:
+    GraphicsView(QGraphicsScene *scene = nullptr, QWidget *parent = nullptr);
+
+    bool viewportEvent(QEvent *event) override;
+
+private:
+    qreal totalScaleFactor = 1;
+};

examples/widgets/touch/pinchzoom/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "graphicsview.h"
+#include "mouse.h"
+
+#include <QApplication>
+#include <cmath>
+
+static constexpr int MouseCount = 7;
+
+//! [0]
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+//! [0]
+
+//! [1]
+    QGraphicsScene scene;
+    scene.setSceneRect(-300, -300, 600, 600);
+//! [1] //! [2]
+    scene.setItemIndexMethod(QGraphicsScene::NoIndex);
+//! [2]
+
+//! [3]
+    for (int i = 0; i < MouseCount; ++i) {
+        Mouse *mouse = new Mouse;
+        mouse->setPos(::sin((i * 6.28) / MouseCount) * 200,
+                      ::cos((i * 6.28) / MouseCount) * 200);
+        scene.addItem(mouse);
+    }
+//! [3]
+
+//! [4]
+    GraphicsView view(&scene);
+    view.setRenderHint(QPainter::Antialiasing);
+    view.setBackgroundBrush(QPixmap(":/images/cheese.jpg"));
+//! [4] //! [5]
+    view.setCacheMode(QGraphicsView::CacheBackground);
+    view.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
+//! [5] //! [6]
+    view.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Colliding Mice"));
+    view.showMaximized();
+
+    return app.exec();
+}
+//! [6]

examples/widgets/touch/pinchzoom/mice.qrc

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+<RCC>
+    <qresource prefix="/" >
+        <file>images/cheese.jpg</file>
+    </qresource>
+</RCC>

examples/widgets/touch/pinchzoom/mouse.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "mouse.h"
+
+#include <QGraphicsScene>
+#include <QPainter>
+#include <QRandomGenerator>
+#include <QStyleOption>
+#include <qmath.h>
+
+constexpr qreal Pi = M_PI;
+constexpr qreal TwoPi = 2 * M_PI;
+
+static qreal normalizeAngle(qreal angle)
+{
+    while (angle < 0)
+        angle += TwoPi;
+    while (angle > TwoPi)
+        angle -= TwoPi;
+    return angle;
+}
+
+//! [0]
+Mouse::Mouse() : color(QRandomGenerator::global()->bounded(256),
+                       QRandomGenerator::global()->bounded(256),
+                       QRandomGenerator::global()->bounded(256))
+{
+    setTransform(QTransform().rotate(QRandomGenerator::global()->bounded(360 * 16)), true);
+    startTimer(1000 / 33);
+}
+//! [0]
+
+//! [1]
+QRectF Mouse::boundingRect() const
+{
+    qreal adjust = 0.5;
+    return QRectF(-18 - adjust, -22 - adjust,
+                  36 + adjust, 60 + adjust);
+}
+//! [1]
+
+//! [2]
+QPainterPath Mouse::shape() const
+{
+    QPainterPath path;
+    path.addRect(-10, -20, 20, 40);
+    return path;
+}
+//! [2]
+
+//! [3]
+void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
+{
+    // Body
+    painter->setBrush(color);
+    painter->drawEllipse(-10, -20, 20, 40);
+
+    // Eyes
+    painter->setBrush(Qt::white);
+    painter->drawEllipse(-10, -17, 8, 8);
+    painter->drawEllipse(2, -17, 8, 8);
+
+    // Nose
+    painter->setBrush(Qt::black);
+    painter->drawEllipse(QRectF(-2, -22, 4, 4));
+
+    // Pupils
+    painter->drawEllipse(QRectF(-8.0 + mouseEyeDirection, -17, 4, 4));
+    painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4));
+
+    // Ears
+    painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red);
+    painter->drawEllipse(-17, -12, 16, 16);
+    painter->drawEllipse(1, -12, 16, 16);
+
+    // Tail
+    QPainterPath path(QPointF(0, 20));
+    path.cubicTo(-5, 22, -5, 22, 0, 25);
+    path.cubicTo(5, 27, 5, 32, 0, 30);
+    path.cubicTo(-5, 32, -5, 42, 0, 35);
+    painter->setBrush(Qt::NoBrush);
+    painter->drawPath(path);
+}
+//! [3]
+
+//! [4]
+void Mouse::timerEvent(QTimerEvent *)
+{
+//! [4]
+    // Don't move too far away
+//! [5]
+    QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0));
+    if (lineToCenter.length() > 150) {
+        qreal angleToCenter = std::atan2(lineToCenter.dy(), lineToCenter.dx());
+        angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2);
+
+        if (angleToCenter < Pi && angleToCenter > Pi / 4) {
+            // Rotate left
+            angle += (angle < -Pi / 2) ? 0.25 : -0.25;
+        } else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) {
+            // Rotate right
+            angle += (angle < Pi / 2) ? 0.25 : -0.25;
+        }
+    } else if (::sin(angle) < 0) {
+        angle += 0.25;
+    } else if (::sin(angle) > 0) {
+        angle -= 0.25;
+//! [5] //! [6]
+    }
+//! [6]
+
+    // Try not to crash with any other mice
+//! [7]
+    QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF()
+                                                       << mapToScene(0, 0)
+                                                       << mapToScene(-30, -50)
+                                                       << mapToScene(30, -50));
+    for (QGraphicsItem *item : dangerMice) {
+        if (item == this)
+            continue;
+
+        QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0));
+        qreal angleToMouse = std::atan2(lineToMouse.dy(), lineToMouse.dx());
+        angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2);
+
+        if (angleToMouse >= 0 && angleToMouse < Pi / 2) {
+            // Rotate right
+            angle += 0.5;
+        } else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) {
+            // Rotate left
+            angle -= 0.5;
+//! [7] //! [8]
+        }
+//! [8] //! [9]
+    }
+//! [9]
+
+    // Add some random movement
+//! [10]
+    if (dangerMice.size() > 1 && QRandomGenerator::global()->bounded(10) == 0) {
+        if (QRandomGenerator::global()->bounded(1))
+            angle += QRandomGenerator::global()->bounded(1 / 500.0);
+        else
+            angle -= QRandomGenerator::global()->bounded(1 / 500.0);
+    }
+//! [10]
+
+//! [11]
+    speed += (-50 + QRandomGenerator::global()->bounded(100)) / 100.0;
+
+    qreal dx = ::sin(angle) * 10;
+    mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5;
+
+    setTransform(QTransform().rotate(dx), true);
+    setPos(mapToParent(0, -(3 + sin(speed) * 3)));
+}
+//! [11]

examples/widgets/touch/pinchzoom/mouse.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MOUSE_H
+#define MOUSE_H
+
+#include <QGraphicsObject>
+
+//! [0]
+class Mouse : public QGraphicsObject
+{
+    Q_OBJECT
+
+public:
+    Mouse();
+
+    QRectF boundingRect() const override;
+    QPainterPath shape() const override;
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+               QWidget *widget) override;
+
+protected:
+    void timerEvent(QTimerEvent *event) override;
+
+private:
+    qreal angle = 0;
+    qreal speed = 0;
+    qreal mouseEyeDirection = 0;
+    QColor color;
+};
+//! [0]
+
+#endif

examples/widgets/touch/pinchzoom/pinchzoom.pro

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+QT += widgets
+
+HEADERS += \
+        mouse.h \
+        graphicsview.h
+SOURCES += \
+	main.cpp \
+        mouse.cpp \
+        graphicsview.cpp
+
+RESOURCES += \
+	mice.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/touch/pinchzoom
+INSTALLS += target