1. #pragma once
    2. #include <QtWidgets/QWidget>
    3. #include "ui_hackRain.h"
    4. #include <QMouseEvent>
    5. #include <QVector>
    7. #define RainNum 200
    8. #define StrNum 10
    9. #define CharH 30
    11. struct Rain
    12. {
    13.     int x;  // 雨串开始点x
    14.     int y;  // 雨串开始点y
    15.     QString str;  // 代码雨的字串
    16. };
    18. class hackRain : public QWidget
    19. {
    20.     Q_OBJECT
    21. public:
    22.     hackRain(QWidget *parent = Q_NULLPTR);
    23. public:
    24.     void initRain();
    25.     // 给字体着色
    26.     void render();
    27.     // 更新位置
    28.     void update();
    29. private:
    30.     Ui::hackRainClass ui;
    31.     QRect m_Screen;
    32.     Rain m_rains[RainNum];
    33.     QPainter* m_painter;
    34. private:
    35.     void paintEvent(QPaintEvent* event);
    36.     void mouseMoveEvent(QMouseEvent* event);
    37. };
    1. #include "hackRain.h"
    2. #include <QDesktopWidget>
    3. #include <QPainter>
    4. #include <QPen>
    5. #include <QBrush>
    6. #include <QDebug>
    7. #include <QRandomGenerator>
    8. #include <QTimer>
    9. #include <QIcon>
    11. int rnd(int beg, int end)
    12. {   // 返回 [beg,end)内的一个int值
    13.     return QRandomGenerator::global()->bounded(beg, end);
    14. }
    16. hackRain::hackRain(QWidget *parent)
    17.     : QWidget(parent)
    18. {
    19.     ui.setupUi(this);
    20.     // 无边框窗口, 黑色背景
    21.     this->setWindowFlags(Qt::FramelessWindowHint);
    22.     this->setStyleSheet("background-color:black;");
    23.     // 使画布全屏
    24.     m_Screen = QDesktopWidget().screenGeometry();   // 获取桌面 QRect(0,0  2560x1440)
    25.     this->resize(m_Screen.width(), m_Screen.height());  // 令窗口大小和桌面大小一样
    26.     // 构建m_rains
    27.     initRain();
    28.     m_painter = new QPainter(this);
    29.     m_painter->setFont(QFont("Times", CharH));
    30.     QTimer* timer = new QTimer(this);
    31.     timer->start(50); // 每隔50ms发送信号
    32.     connect(timer, &QTimer::timeout, [=]() {
    33.         QWidget::update();  // 重绘画面,调用paintEvent()
    34.     });
    35. }
    37. void hackRain::initRain()
    38. {
    39.     for (int i = 0; i < RainNum; i++) {
    40.         m_rains[i].x = rnd(0, m_Screen.width());
    41.         m_rains[i].y = rnd(0, m_Screen.height());
    42.         for (int j = 0; j < StrNum; j++) {
    43.             int type = rnd(0, 3);   // 0数字,1小写字母,2大写字母
    44.             char ch;
    45.             if (type == 0)
    46.                 ch = rnd('0', '9' + 1);
    47.             else if (type == 1)
    48.                 ch = rnd('a', 'z' + 1);
    49.             else
    50.                 ch = rnd('A', 'Z' + 1);
    51.             m_rains[i].str.append(ch);
    52.         }
    53.     }
    54. }
    56. void hackRain::paintEvent(QPaintEvent* event)
    57. {
    58.     m_painter->begin(this);
    59.     for (int i = 0; i < RainNum; i++) {
    60.         m_rains[i].y += CharH * rnd(1, 3);   // 降落1~2个字符
    61.         // 若雨滴已经完全落下, 则让它从上面重新复活
    62.         if (m_rains[i].y >= m_Screen.height() + StrNum * CharH) {
    63.             m_rains[i].x = rnd(0, m_Screen.width());
    64.             m_rains[i].y = 0;
    65.         }
    66.         for (int j = 0; j < StrNum; j++) {
    67.             QPen penGreen(QColor(0, 255 - 20 * j, 0));    // 颜色渐浅
    68.             m_painter->setPen(penGreen);
    69.             Rain rain = m_rains[i];
    70.             int x = m_rains[i].x;
    71.             int y = m_rains[i].y - j * CharH;
    72.             m_painter->drawText(x, y, m_rains[i].str.at(j));
    73.         }
    74.     }
    75.     m_painter->end();
    76. }
    78. void hackRain::mouseMoveEvent(QMouseEvent* event)
    79. {
    80.     qApp->quit();   // 移动后退出
    81. }