用c++写烟花代码

好的，以下是一个基于C++的烟花代码示例：

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <Windows.h>
using namespace std;

const int SCREEN_WIDTH = 80;
const int SCREEN_HEIGHT = 25;

struct Particle
{
    double x;
    double y;
    double vx;
    double vy;
    int color;
};

void setCursorPosition(int x, int y)
{
    COORD position = { x, y };
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), position);
}

void drawPixel(int x, int y, int color)
{
    setCursorPosition(x, y);
    HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTextAttribute(hConsole, color);
    cout << " ";
}

int getRandom(int min, int max)
{
    static bool initialized = false;
    if (!initialized)
    {
        srand(static_cast<unsigned int>(time(nullptr)));
        initialized = true;
    }
    return rand() % (max - min + 1) + min;
}

void createParticles(Particle particles[], int count, double x, double y, int color)
{
    for (int i = 0; i < count; i++)
    {
        double angle = getRandom(0, 360) * 3.14159 / 180.0;
        double speed = getRandom(10, 200) / 100.0;
        particles[i].x = x;
        particles[i].y = y;
        particles[i].vx = speed * cos(angle);
        particles[i].vy = speed * sin(angle);
        particles[i].color = color;
    }
}

void updateParticles(Particle particles[], int count, double dt, double gravity, double airResistance)
{
    for (int i = 0; i < count; i++)
    {
        particles[i].vx *= pow(airResistance, dt);
        particles[i].vy = particles[i].vy * pow(airResistance, dt) + gravity * dt;
        particles[i].x += particles[i].vx * dt;
        particles[i].y += particles[i].vy * dt;
    }
}

void drawParticles(Particle particles[], int count)
{
    for (int i = 0; i < count; i++)
    {
        int x = static_cast<int>(particles[i].x);
        int y = static_cast<int>(particles[i].y);
        if (x >= 0 && x < SCREEN_WIDTH && y >= 0 && y < SCREEN_HEIGHT)
        {
            drawPixel(x, y, particles[i].color);
        }
    }
}

int main()
{
    srand(static_cast<unsigned int>(time(nullptr)));
    Particle particles[1000];
    double dt = 0.1;
    double gravity = 9.8;
    double airResistance = 0.99;
    int count = 0;

    while (true)
    {
        if (count > 0)
        {
            updateParticles(particles, count, dt, gravity, airResistance);
            drawParticles(particles, count);
        }

        if (getRandom(0, 100) == 0)
        {
            double x = getRandom(0, SCREEN_WIDTH - 1);
            double y = SCREEN_HEIGHT - 1;
            int color = getRandom(8, 15);
            createParticles(particles, 50, x, y, color);
            count += 50;
        }

        Sleep(10);
    }

    return 0;
}

这个示例使用了粒子系统来模拟烟花的效果，每次随机在屏幕上某个位置生成一些粒子，然后让它们以某个速度随机移动，并且受到重力和空气阻力的影响。粒子会在屏幕上留下一条轨迹，这样就形成了烟花的效果。