Qt实现钟表

利用Qt中的绘图工具绘制一个表，具体效果如下：

#pragma once
#include 
#include 
#include 
#include 
class DrawClock : public QWidget
{
	Q_OBJECT
public:
	explicit DrawClock(QWidget* parent = nullptr);

protected:
	void paintEvent(QPaintEvent* pEvent);

private:
	void initWin();

	void paint(QPainter& painter);

	QColor randColor();
private:
	QPointF m_hourVec[4];
	QPointF m_minVec[4];
	QPointF m_secVec[4];

	QTimer* m_pTimer;
};
#include "DrawClock.h"
#include 
DrawClock::DrawClock(QWidget* parent)
	: QWidget(parent)
{
	this->initWin();
}

void DrawClock::initWin()
{
	m_hourVec[0] = QPointF(4, -5);
	m_hourVec[1] = QPointF(0, -45);
	m_hourVec[2] = QPointF(-4, -5);
	m_hourVec[3] = QPointF(0, 12);

	m_minVec[0] = QPointF(3, -5);
	m_minVec[1] = QPointF(0, -55);
	m_minVec[2] = QPointF(-3, -5);
	m_minVec[3] = QPointF(0, 12);

	m_secVec[0] = QPointF(2, -5);
	m_secVec[1] = QPointF(0, -65);
	m_secVec[2] = QPointF(-2, -5);
	m_secVec[3] = QPointF(0, 12);

	m_pTimer = new QTimer(this);
	m_pTimer->start(1000);
	connect(m_pTimer, SIGNAL(timeout()), this, SLOT(update()));
}

void DrawClock::paintEvent(QPaintEvent* pEvent)
{
	QPainter painter(this);
	painter.setRenderHint(QPainter::Antialiasing, true);

	int side = qMin(width(), height());
	painter.setViewport((width() - side) / 2, (height() - side) / 2, side, side);
	painter.setWindow(0, 0, 200, 200);
	this->paint(painter);
	

	QWidget::paintEvent(pEvent);
}

void DrawClock::paint(QPainter& painter)
{
	QTime time = QTime::currentTime();
	painter.translate(QPointF(100, 100));
	painter.setRenderHint(QPainter::Antialiasing);

	painter.setBrush(Qt::gray);
	painter.setPen(Qt::gray);
	painter.save();
	painter.drawRect(-30, 30, 60, 10);
	painter.restore();
	
	painter.setBrush(Qt::NoBrush);
	painter.setPen(QPen(randColor(), 1.5, Qt::SolidLine));
	painter.save();
	painter.drawText(-30, 30, 60, 10, Qt::AlignCenter, QDate::currentDate().toString("yyyy-MM-dd"));
	painter.restore();

	painter.setBrush(randColor());
	painter.setPen(randColor());
	painter.save();
	painter.rotate(6.0 * time.second());
	painter.drawConvexPolygon(m_secVec, 4);
	painter.restore();

	painter.setBrush(randColor());
	painter.setPen(randColor());
	painter.save();
	painter.rotate(6.0 * (time.minute() + time.second() / 60.0));
	painter.drawConvexPolygon(m_minVec, 4);
	painter.restore();

	painter.setBrush(randColor());
	painter.setPen(randColor());
	painter.save();
	painter.rotate(30.0 * (time.hour() + time.minute() / 60.0));
	painter.drawConvexPolygon(m_hourVec, 4);
	painter.restore();

	painter.setBrush(Qt::white);
	painter.setPen(Qt::white);
	painter.drawEllipse(-1, -1, 3, 3);

	QPen pen1(randColor(), 2.5);
	QPen pen2(randColor(), 1.5);
	QPen fontPen(QColor(qrand() % 255 - 0, qrand() % 255 - 0, qrand() % 255 - 0), 4, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
	for (int i = 1; i <= 60; ++i)
	{
		painter.save();
		painter.rotate(6 * i);//坐标轴旋转6度
		if (i % 5 == 0)
		{
			painter.setPen(pen1);
			painter.drawLine(0, -98, 0, -90);

			painter.setPen(fontPen);
			painter.drawText(-20, -82, 40, 20,Qt::AlignHCenter | Qt::AlignTop,QString::number(i / 5));
		}
		else
		{
			painter.setPen(pen2);
			painter.drawLine(0, -98, 0, -94);
		}
		painter.restore();
	}

}

QColor DrawClock::randColor()
{
	return QColor(rand() % 255 - 0, rand() % 255 - 0, rand() % 255 - 0);
}