qt模拟simulink嵌套子系统c++示例
时间: 2023-07-22 10:14:16 浏览: 189
下面是一个简单的Qt示例代码,用于模拟Simulink嵌套子系统的功能。代码实现了一个加法器和一个乘法器,这两个组件可以嵌套在一个自定义QWidget中,实现嵌套子系统的功能。
main.cpp:
```cpp
#include <QApplication>
#include "mysystem.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
// 创建一个自定义QWidget,用于表示嵌套子系统的外部框架
MySystem system;
system.show();
return a.exec();
}
```
mysystem.h:
```cpp
#ifndef MYSYSTEM_H
#define MYSYSTEM_H
#include <QWidget>
#include <QGraphicsScene>
class MySystem : public QWidget
{
Q_OBJECT
public:
explicit MySystem(QWidget *parent = 0);
private:
QGraphicsScene *scene;
};
#endif // MYSYSTEM_H
```
mysystem.cpp:
```cpp
#include "mysystem.h"
#include "myitem.h"
MySystem::MySystem(QWidget *parent) :
QWidget(parent)
{
// 创建一个QGraphicsScene,用于显示和编辑组件
scene = new QGraphicsScene(this);
// 创建一个加法器
MyItem *adder = new MyItem("+", QColor(Qt::red), this);
adder->setPos(50, 50);
scene->addItem(adder);
// 创建一个乘法器
MyItem *multiplier = new MyItem("*", QColor(Qt::blue), this);
multiplier->setPos(150, 150);
scene->addItem(multiplier);
// 将加法器嵌套到乘法器中
multiplier->addItem(adder);
// 设置场景大小
scene->setSceneRect(0, 0, 300, 300);
// 将场景添加到QWidget中
QGraphicsView *view = new QGraphicsView(scene, this);
view->setRenderHint(QPainter::Antialiasing);
view->setDragMode(QGraphicsView::RubberBandDrag);
view->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
view->setRenderHint(QPainter::SmoothPixmapTransform);
view->setMinimumSize(300, 300);
}
```
myitem.h:
```cpp
#ifndef MYITEM_H
#define MYITEM_H
#include <QGraphicsItem>
#include <QList>
class MyItem : public QGraphicsItem
{
public:
MyItem(QString text, QColor color, QGraphicsItem *parent = 0);
void addItem(MyItem *item);
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
private:
QString text;
QColor color;
QList<MyItem *> childItems;
};
#endif // MYITEM_H
```
myitem.cpp:
```cpp
#include "myitem.h"
#include <QPainter>
#include <QStyleOptionGraphicsItem>
#include <QGraphicsSceneMouseEvent>
MyItem::MyItem(QString text, QColor color, QGraphicsItem *parent)
: QGraphicsItem(parent)
{
this->text = text;
this->color = color;
}
void MyItem::addItem(MyItem *item)
{
childItems.append(item);
}
QRectF MyItem::boundingRect() const
{
return QRectF(0, 0, 100, 50);
}
void MyItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option);
Q_UNUSED(widget);
// 绘制组件的外框
painter->setPen(QPen(Qt::black, 1));
painter->setBrush(QBrush(color));
painter->drawRect(0, 0, 100, 50);
// 绘制组件的文本
painter->setPen(QPen(Qt::black, 1));
painter->setFont(QFont("Arial", 12));
painter->drawText(QRectF(0, 0, 100, 50), Qt::AlignCenter, text);
}
void MyItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
// 记录鼠标按下的位置
startPos = event->pos();
}
void MyItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
// 移动组件
QPointF delta = event->pos() - startPos;
moveBy(delta.x(), delta.y());
}
void MyItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
// 连接组件
QList<QGraphicsItem *> items = scene()->items(event->scenePos());
foreach (QGraphicsItem *item, items) {
MyItem *myItem = dynamic_cast<MyItem *>(item);
if (myItem && myItem != this) {
myItem->addItem(this);
}
}
}
```
这段代码实现了一个非常简单的嵌套子系统,仅供参考。如果需要实现更复杂的功能,需要根据具体情况进行修改和扩展。
阅读全文