Qt 绘制表白爱心【李珣表白爱心】-Toy模板网

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Qt 绘制表白爱心【李珣表白爱心】

通过QtPainter进行绘制，具体实现可以参考
B站爱心绘制实现

1. functions.h


#include <QPointF>
#include <QRandomGenerator>

#define IMAGE_ENLARGE 15

// 心形函数
QPointF heart_function(qreal t, qreal shrink_ratio = IMAGE_ENLARGE) {
    qreal x = 16 * (sin(t) * sin(t) * sin(t));
    qreal y = -(13 * cos(t) - 5 * cos(2 * t) - 2 * cos(3 * t) - cos(4 * t));
    x *= shrink_ratio;
    y *= shrink_ratio;
    return QPointF(x, y);
}

// 指数分布, 随机内部扩散点
QPointF scatter_inside(QPointF &point, qreal beta = 0.05) {
    qreal ratiox = -log(QRandomGenerator::global()->bounded(1.0)) * beta;
    qreal ratioy = -log(QRandomGenerator::global()->bounded(1.0)) * beta;
    qreal dx = point.x() * ratiox;
    qreal dy = point.y() * ratioy;
    return QPointF(point.x() - dx, point.y() - dy);
}

QPointF caculate_position(QPointF &point, qreal ratio = 0.9) {
    qreal force = 1 / qPow((point.x() * point.x() + point.y() * point.y()), 0.6);
    qreal dx = point.x() * force * ratio + QRandomGenerator::global()->bounded(-1, 1);
    qreal dy = point.y() * force * ratio + QRandomGenerator::global()->bounded(-1, 1);
    return QPointF(point.x() - dx, point.y() - dy);
}

QPointF shrink_ratio(QPointF &point, qreal ratio = 0.9) {
    qreal force = -1 / qPow((point.x() * point.x() + point.y() * point.y()), 0.6);
    qreal dx = point.x() * force * ratio;
    qreal dy = point.y() * force * ratio;
    return QPointF(point.x() - dx, point.y() - dy);
}

qreal curve(qreal p) {
    return 2 * (2 * sin(4 * p)) / (2 * M_PI);
}

mainwindow.h


#include <QWidget>
#include <QRandomGenerator>


QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QWidget {
Q_OBJECT
protected:
    void paintEvent(QPaintEvent *event) override;
    void resizeEvent(QResizeEvent *event) override;

public:
    explicit MainWindow(QWidget *parent = nullptr);

    ~MainWindow() override;


private:
    Ui::MainWindow *ui;

    qint64 frame = 0; // 当前帧数

    QTimer *timer;
    QList<QPointF> m_points; // 原始爱心坐标集合
    QList<QPointF> m_edge_diffusion_points; // 边缘扩散效果点坐标集合
    QList<QPointF> m_center_diffusion_points; // 中心扩散效果点坐标集合

    void initPoints(); // 初始化爱心坐标集合

};

mainwindow.cpp


#include "mainwindow.h"
#include "utils/functions.h"
#include "ui_MainWindow.h"
#include <QPainter>
#include <QPainterPath>
#include <QTimer>


#define HEART_COLOR "#ff2121"
#define POINTS_NUMBER 2000
#define FREQUENCY 50
#define DANCESIZE 50


MainWindow::MainWindow(QWidget *parent) :
        QWidget(parent), ui(new Ui::MainWindow) {
    ui->setupUi(this);
    // 背景色黑色
    this->setStyleSheet("background-color:black;");
    // 设置窗口大小
     this->setFixedSize(800, 600);
    // 设置窗口标题
    this->setWindowTitle("LoveStar");
    initPoints();
    timer = new QTimer(this);
    connect(timer, &QTimer::timeout, this, qOverload<>(&MainWindow::update));
    timer->start(1000 / FREQUENCY);
}

MainWindow::~MainWindow() {
    delete ui;
}


void MainWindow::paintEvent(QPaintEvent *event) {

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);
    // 画笔设置
    painter.setPen(QPen(QColor(HEART_COLOR), 1));
    painter.save();
    painter.translate(this->width() / 2, this->height() / 2);
    // 绘制每一帧数据
    // 缩放比例
    qreal ratio = DANCESIZE * curve(frame / (double) FREQUENCY * M_PI);
    QPolygonF points;
    qint32 halo_radius = int(4 + 6 * (1 + curve(frame / (double) FREQUENCY * M_PI)));
    qint32 halo_number = int(
            3000 + 4000 * abs(curve(frame / (double) FREQUENCY * M_PI) * curve(frame / (double) FREQUENCY * M_PI)));

    // 光环
    for (int i = 0; i < halo_number; i++) {
        qreal t = QRandomGenerator::global()->bounded(2 * M_PI);
        QPointF p = heart_function(t, IMAGE_ENLARGE);
        QPointF pp = shrink_ratio(p, halo_radius);
        pp.setX(pp.x() + QRandomGenerator::global()->bounded(-14, 14));
        pp.setY(pp.y() + QRandomGenerator::global()->bounded(-14, 14));
        points.append(pp);
    }

    // 轮廓
    for (int i = 0; i < POINTS_NUMBER; i++) {
        QPointF p = m_points.at(i);
        p = caculate_position(p, ratio);
        points.append(p);
    }

    // 边缘扩散效果
    for (int i = 0; i < m_edge_diffusion_points.size(); ++i) {
        QPointF p = m_edge_diffusion_points.at(i);
        p = caculate_position(p, ratio);
        points.append(p);
    }

    // 中心扩散效果
    for (int i = 0; i < m_center_diffusion_points.size(); ++i) {
        QPointF p = m_center_diffusion_points.at(i);
        p = caculate_position(p, ratio);
        points.append(p);
    }

    painter.drawPoints(points);
    painter.restore();
    frame++;
}

void MainWindow::resizeEvent(QResizeEvent *event) {
    update();
}

void MainWindow::initPoints() {

    // 初始化爱心坐标集合
    m_points.clear();
    m_edge_diffusion_points.clear();
    m_center_diffusion_points.clear();
    for (int i = 0; i < POINTS_NUMBER; i++) {
        // 生成随机坐标
        qreal t = QRandomGenerator::global()->bounded(2 * M_PI);
        QPointF p = heart_function(t);
        m_points.append(p);
    }

    // 初始化边缘扩散效果点坐标集合
    for (int i = 0; i < POINTS_NUMBER; i++) {
        QPointF p = m_points.at(i);
        for (int j = 0; j < 3; ++j) {
            QPointF s = scatter_inside(p, 0.05);
            m_edge_diffusion_points.append(s);
        }
    }
    // 初始化中心扩散效果点坐标集合
    for (int i = 0; i < POINTS_NUMBER * 2; i++) {
        qint32 index = QRandomGenerator::global()->bounded(POINTS_NUMBER);
        QPointF p = m_points.at(index);
        QPointF s = scatter_inside(p, 0.17);
        m_center_diffusion_points.append(s);
    }
}

main.cpp

#include <QApplication>
#include <mainwindow.h>


int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return QApplication::exec();
}