用Qt 画一个心形

MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTimer>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

    void timerEvent(QTimerEvent *);
    void paintEvent(QPaintEvent *event);

private:
    int m_x,m_y;
    int m_k;
    float m_t;
};

#endif // MAINWINDOW_H

MainWindow.cpp

#include "mainwindow.h"
#include <QDebug>
#include <math.h>
#include <QPainter>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    this->setFixedSize(600,600);
    m_k = 10;
    m_t = 0;
    startTimer(1);

}

MainWindow::~MainWindow()
{

}

void MainWindow::timerEvent(QTimerEvent *)
{
    qDebug() << "timer event " << m_t;
    if (m_t > 500)
    {
        update();
        m_t = 0;
    }
    m_x = 16 * m_k * sin(m_k*m_t)*sin(m_k*m_t)*sin(m_k*m_t);
    m_y = 13 * m_k * cos(m_k*m_t) - 5 * m_k * cos(2 * m_k * m_t) - 2 * m_k * cos(3 * m_k * m_t) - cos(4 * m_k * m_t);
    m_x += this->width() / 2;
    m_y -= this->height() / 2;
    m_y *= -1;
    update(m_x,m_y,1,1);

    m_t += 0.1;
}

#if 1
void MainWindow::paintEvent(QPaintEvent *event)
{
    qDebug() << "paintEvent " << m_x << " " << m_y;
    QPainter painter(this);
    painter.setPen(Qt::red);
    painter.drawPoint(m_x, m_y);
}
#else
void MainWindow::paintEvent(QPaintEvent *event)
{
   double k = 10;
   QPainter painter(this);
   painter.setRenderHint(QPainter::Antialiasing, true);
   QColor my_color(237, 162, 255, 255);
   QBrush my_brush(my_color);
   painter.setPen(Qt::red);
   /*painter.setBrush(my_brush);*/
   painter.translate(this->width()/2, this->height()/2);
   QPainterPath polygonPath;
   polygonPath.setFillRule(Qt::WindingFill);
   float x = 16 * k * sin(0.0)*sin(0.0)*sin(0.0);
   float y = 13 * k * cos(0.0) - 5 * k*cos(0.0) - 2 * k*cos(0.0) - cos(0.0);
   polygonPath.moveTo(x, -y);
   for (double t = 0.01; t < 100; t += 0.05)
   {
       x = 16 * k * sin(k*t)*sin(k*t)*sin(k*t);
       y = 13 * k * cos(k*t) - 5 * k * cos(2 * k * t) - 2 * k * cos(3 * k * t) - cos(4 * k * t);
       polygonPath.lineTo(x, -y);
#if 0
       painter.drawPoint(x,-y);
       painter.drawLine(0,0,x,-y);
       painter.drawLine(0,0,x+100,-y);
#endif
   }
   painter.drawPath(polygonPath);
}
#endif