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Qt6QMLBeginnersCode/12-TransformsTransitionsAnimations/12-PendulumSwing/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+project(12-PendulumSwing VERSION 0.1 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt6 6.4 REQUIRED COMPONENTS Quick)
+
+qt_standard_project_setup()
+
+qt_add_executable(app12-PendulumSwing
+    main.cpp
+)
+
+qt_add_qml_module(app12-PendulumSwing
+    URI 12-PendulumSwing
+    VERSION 1.0
+    QML_FILES Main.qml
+)
+
+# Qt for iOS sets MACOSX_BUNDLE_GUI_IDENTIFIER automatically since Qt 6.1.
+# If you are developing for iOS or macOS you should consider setting an
+# explicit, fixed bundle identifier manually though.
+set_target_properties(app12-PendulumSwing PROPERTIES
+#    MACOSX_BUNDLE_GUI_IDENTIFIER com.example.app12-PendulumSwing
+    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
+    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
+    MACOSX_BUNDLE TRUE
+    WIN32_EXECUTABLE TRUE
+)
+
+target_link_libraries(app12-PendulumSwing
+    PRIVATE Qt6::Quick
+)
+
+include(GNUInstallDirs)
+install(TARGETS app12-PendulumSwing
+    BUNDLE DESTINATION .
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)

Qt6QMLBeginnersCode/12-TransformsTransitionsAnimations/12-PendulumSwing/Main.qml

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+import QtQuick
+
+Window {
+    width: 640
+    height: 480
+    visible: true
+    title: qsTr("Pendulum Swing")
+
+    readonly property int pendulumAngle: 30
+    readonly property int animDuration: 700
+
+    Rectangle{
+        id: pendulumId
+        width: 20
+        height: 200
+        color: "black"
+        x: (parent.width - width)/2
+        y: 50
+        transformOrigin: Item.Top
+
+        Rectangle{
+            id: bobId
+            width: 50
+            height: 50
+            color: "red"
+            radius: width/2
+            x: (pendulumId.width - width)/2
+            y: pendulumId.height
+            transformOrigin: Item.Bottom
+            rotation: pendulumId.rotation
+        }
+
+        SequentialAnimation{
+            loops: Animation.Infinite
+            running: true
+            NumberAnimation{
+                id: rightToLeftAnimationId
+                target: pendulumId
+                property: "rotation"
+                from: -pendulumAngle
+                to: pendulumAngle
+                duration: animDuration
+                easing.type: Easing.InOutQuad
+            }
+
+            NumberAnimation{
+                id: leftToRightAnimationId
+                target: pendulumId
+                property: "rotation"
+                from: pendulumAngle
+                to: -pendulumAngle
+                duration: animDuration
+                easing.type: Easing.InOutQuad
+            }
+        }
+    }
+}

Qt6QMLBeginnersCode/12-TransformsTransitionsAnimations/12-PendulumSwing/main.cpp

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+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    QQmlApplicationEngine engine;
+    const QUrl url(u"qrc:/12-PendulumSwing/Main.qml"_qs);
+    QObject::connect(
+        &engine,
+        &QQmlApplicationEngine::objectCreationFailed,
+        &app,
+        []() { QCoreApplication::exit(-1); },
+        Qt::QueuedConnection);
+    engine.load(url);
+
+    return app.exec();
+}