新功能：增加QTransform示例

PaintingDemo/PaintingDemo.pro

@@ -5,4 +5,5 @@ SUBDIRS += Imagecomposition          # QPainter图像合成Demo
 SUBDIRS += Concentriccircles         # QPainter绘制时【数据类型】和【抗锯齿】对效果的影响
 SUBDIRS += PainterPaths              # QPainterPath使用示例
 SUBDIRS += Transformations           # QPainter偏移原点、旋转、缩放功能Demo
+SUBDIRS += TransformDemo             # QPainter偏移原点、旋转、缩放功能Demo
 SUBDIRS += PlayImage                 # 使用 QPainter绘制图片

PaintingDemo/TransformDemo/TransformDemo.pro

+#---------------------------------------------------------------------------------------
+# @功能：       使用QTransform类示例
+# @编译器：     Desktop Qt 5.12.5 MSVC2017 64bit（也支持其它编译器）
+# @Qt IDE：    D:/Qt/Qt5.12.5/Tools/QtCreator/share/qtcreator
+#
+# @开发者     mhf
+# @邮箱       1603291350@qq.com
+# @时间       2022-09-21 17:02:31
+# @备注
+#---------------------------------------------------------------------------------------
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+CONFIG += c++11
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    main.cpp \
+    renderarea.cpp \
+    widget.cpp
+
+HEADERS += \
+    renderarea.h \
+    widget.h
+
+FORMS += \
+    widget.ui
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target
+
+
+contains(QT_ARCH, i386){        # 使用32位编译器
+DESTDIR = $$PWD/../bin          # 程序输出路径
+}else{
+DESTDIR = $$PWD/../bin64        # 使用64位编译器
+}
+
+# msvc  编译器使用utf-8编码（好像只在msvc2017以后才有效）
+msvc {
+QMAKE_CFLAGS += /utf-8
+QMAKE_CXXFLAGS += /utf-8
+}

PaintingDemo/TransformDemo/main.cpp

+#include "widget.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    Widget w;
+    w.show();
+    return a.exec();
+}

PaintingDemo/TransformDemo/widget.cpp

+#include "widget.h"
+#include "ui_widget.h"
+
+Widget::Widget(QWidget *parent)
+    : QWidget(parent)
+    , ui(new Ui::Widget)
+{
+    ui->setupUi(this);
+}
+
+Widget::~Widget()
+{
+    delete ui;
+}
+

PaintingDemo/TransformDemo/widget.h

+#ifndef WIDGET_H
+#define WIDGET_H
+
+#include <QWidget>
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class Widget; }
+QT_END_NAMESPACE
+
+class Widget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Widget(QWidget *parent = nullptr);
+    ~Widget();
+
+private:
+    Ui::Widget *ui;
+};
+#endif // WIDGET_H

PaintingDemo/TransformDemo/widget.ui

+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Widget</class>
+ <widget class="QWidget" name="Widget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Widget</string>
+  </property>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>