Qt 绘制表白爱心【李珣表白爱心】

Qt 绘制表白爱心【李珣表白爱心】

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_NAMESPACEclass 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 50MainWindow::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();anslate(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);store();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();
}

最终效果

项目地址(欢迎star)

项目源码