1、 使用QT编写程序,完成如下任务: (1) 绘制圆、矩形、椭圆,画笔为黑色 (2) 用代表不同颜色的按键改变它们的填充色 (3) 设置CHANGE按键使椭圆完成90度旋转 (4) 设置RECT按钮可以使得矩形填充色在白色和红色之间变换 (5) 实现填充圆每隔一秒的闪烁,通过按键控制闪烁的启动和停止;改变椭圆旋转的同时,颜色要一致。
时间: 2024-01-24 14:02:59 浏览: 96
好的,我明白了您的问题,以下是我的回答:
这是一个比较复杂的任务,需要使用QT的绘图库和信号槽机制来实现。下面是一个简单的代码示例,供您参考:
```cpp
#include <QtWidgets>
class MyWidget : public QWidget
{
Q_OBJECT
public:
MyWidget(QWidget *parent = nullptr);
private slots:
void changeColor();
void changeRectColor();
void rotateEllipse();
void blinkCircle();
private:
void paintEvent(QPaintEvent *event);
QColor m_circleColor;
QColor m_rectColor;
QColor m_ellipseColor;
bool m_circleBlink;
QTimer m_blinkTimer;
int m_ellipseAngle;
};
MyWidget::MyWidget(QWidget *parent)
: QWidget(parent)
{
m_circleColor = Qt::black;
m_rectColor = Qt::white;
m_ellipseColor = Qt::black;
m_circleBlink = false;
m_ellipseAngle = 0;
QPushButton *circleButton = new QPushButton(tr("Circle"));
QPushButton *rectButton = new QPushButton(tr("Rect"));
QPushButton *ellipseButton = new QPushButton(tr("Ellipse"));
QPushButton *changeButton = new QPushButton(tr("Change"));
QPushButton *blinkButton = new QPushButton(tr("Blink"));
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(circleButton);
layout->addWidget(rectButton);
layout->addWidget(ellipseButton);
layout->addWidget(changeButton);
layout->addWidget(blinkButton);
setLayout(layout);
connect(circleButton, &QPushButton::clicked, [=](){
m_circleColor = QColorDialog::getColor(m_circleColor, this);
update();
});
connect(rectButton, &QPushButton::clicked, [=](){
m_rectColor = (m_rectColor == Qt::white) ? Qt::red : Qt::white;
update();
});
connect(ellipseButton, &QPushButton::clicked, [=](){
m_ellipseColor = QColorDialog::getColor(m_ellipseColor, this);
update();
});
connect(changeButton, &QPushButton::clicked, this, &MyWidget::rotateEllipse);
connect(blinkButton, &QPushButton::clicked, [=](){
m_circleBlink = !m_circleBlink;
if (m_circleBlink) {
m_blinkTimer.start(1000);
} else {
m_blinkTimer.stop();
m_circleColor = Qt::black;
update();
}
});
connect(&m_blinkTimer, &QTimer::timeout, this, &MyWidget::blinkCircle);
}
void MyWidget::changeColor()
{
QPushButton *button = qobject_cast<QPushButton*>(sender());
if (button) {
QColor color = button->palette().button().color();
m_circleColor = color;
m_rectColor = color;
m_ellipseColor = color;
update();
}
}
void MyWidget::changeRectColor()
{
m_rectColor = (m_rectColor == Qt::white) ? Qt::red : Qt::white;
update();
}
void MyWidget::rotateEllipse()
{
m_ellipseAngle += 90;
m_ellipseAngle %= 360;
update();
}
void MyWidget::blinkCircle()
{
m_circleColor = (m_circleColor == Qt::black) ? Qt::white : Qt::black;
update();
}
void MyWidget::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter painter(this);
painter.setPen(Qt::black);
// draw circle
painter.setBrush(m_circleColor);
painter.drawEllipse(QRectF(10, 10, 50, 50));
// draw rectangle
painter.setBrush(m_rectColor);
painter.drawRect(QRectF(70, 10, 50, 50));
// draw ellipse
painter.save();
painter.translate(130, 35);
painter.rotate(m_ellipseAngle);
painter.setBrush(m_ellipseColor);
painter.drawEllipse(QRectF(-25, -15, 50, 30));
painter.restore();
}
```
这是一个简单的窗口,包含五个按钮,可以完成您提出的所有任务。其中,按下圆、矩形、椭圆按钮可以改变它们的填充色;按下RECT按钮可以使矩形填充色在白色和红色之间变换;按下CHANGE按钮可以使椭圆完成90度旋转;按下Blink按钮可以实现填充圆每隔一秒的闪烁,通过按键控制闪烁的启动和停止。
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