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C++烟花代码：简单完整实现
2023-07-06 12:00:57 深夜i     73     0
C++ 烟花 代码 实现 完整

近年来，烟花音乐会一直是人们喜爱的文化活动，而制作烟花程序已成为了程序员们热衷的领域之一。本文将简单介绍一下使用C++实现烟花程序的过程。

首先，我们需要定义烟花的基本属性，如颜色、位置、大小、速度等。这些属性可以定义为结构体或类中的成员。例如：

struct Firework vy;//粒子速度
  double radius;//粒子半径
  double red;

接着，我们需要定义烟花的生成函数和爆炸函数。生成函数会在屏幕上产生一颗烟花，爆炸函数会将烟花粒子扩散开来，并渐渐消失。以下是生成函数和爆炸函数的代码：

void generateFirework(double x, double y){
  Firework firework;
  firework.x = x;
  firework.y = y;
  firework.vx = (rand()%10 - 5.0)/2.0;
  firework.vy = -5 - rand()%5;
  firework.radius = 3;
  firework.red = (double)rand()/RAND_MAX;
  firework.green = (double)rand()/RAND_MAX;
  firework.blue = (double)rand()/RAND_MAX;
  fireworks.push_back(firework);
}
void explodeFirework(Firework firework){
  for(int i=0; i<50; i++){
    Firework particle;
    particle.x = firework.x;
    particle.y = firework.y;
    double velocity = (double)rand()/RAND_MAX * 5 + 5;
    double angle = (double)rand()/RAND_MAX * 2 * 3.1415926;
    particle.vx = velocity * cos(angle);
    particle.vy = velocity * sin(angle);
    particle.radius = 2;
    particle.red = firework.red;
    particle.green = firework.green;
    particle.blue = firework.blue;
    particles.push_back(particle);
  }
}

最后，我们需要循环更新屏幕上的烟花粒子。在每一帧中，我们会先画出爆炸产生的粒子，然后更新烟花粒子的位置，并画出它们。如果烟花的速度为0，便说明烟花已经达到了顶点，需要进行爆炸操作。以下是主循环的代码：

while(!glShouldClose(window)){
  glClearColor(0.0, 0.0, 0.0, 1.0);
  glClear(GL_COLOR_BUFFER_BIT);
  
  for(int i=0; i<particles.size(); i++){
    particles[i].x += particles[i].vx * 0.1;
    particles[i].y += particles[i].vy * 0.1;
    particles[i].vx *= 0.985;
    particles[i].vy *= 0.985;
    glBegin(GL_POINTS);
    glColor3f(particles[i].red, particles[i].green, particles[i].blue);
    glVertex2f(particles[i].x, particles[i].y);
    glEnd();
  }
  for(int i=0; i<fireworks.size(); i++){
    fireworks[i].x += fireworks[i].vx * 0.1;
    fireworks[i].y += fireworks[i].vy * 0.1;
    fireworks[i].vy += 0.05;
    glBegin(GL_POINTS);
    glColor3f(fireworks[i].red, fireworks[i].green, fireworks[i].blue);
    glVertex2f(fireworks[i].x, fireworks[i].y);
    glEnd();
    if(fireworks[i].vy > 0 && !fireworks[i].exploded){
      explodeFirework(fireworks[i]);
      fireworks[i].exploded = true;
    }
  }
  for(int i=0; i<fireworks.size(); i++){
    if(fireworks[i].vy >= 0 && fireworks[i].exploded && particles.empty()){
      fireworks.erase(fireworks.begin() + i);
    }
  }
  glfwSwapBuffers(window);
  glfwPollEvents();
}

在定义完以上内容后，我们只需要在main函数中创建窗口并调用主循环即可。完整代码如下：

#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <stdlib.h>
#include <vector>
#include <math.h>
#include <time.h>
using namespace std;
struct Firework blue;
  bool exploded = false;
;
vector<Firework> fireworks;
vector<Firework> particles;
void generateFirework(double x, double y){
  Firework firework;
  firework.x = x;
  firework.y = y;
  firework.vx = (rand()%10 - 5.0)/2.0;
  firework.vy = -5 - rand()%5;
  firework.radius = 3;
  firework.red = (double)rand()/RAND_MAX;
  firework.green = (double)rand()/RAND_MAX;
  firework.blue = (double)rand()/RAND_MAX;
  fireworks.push_back(firework);
}
void explodeFirework(Firework firework){
  for(int i=0; i<50; i++){
    Firework particle;
    particle.x = firework.x;
    particle.y = firework.y;
    double velocity = (double)rand()/RAND_MAX * 5 + 5;
    double angle = (double)rand()/RAND_MAX * 2 * 3.1415926;
    particle.vx = velocity * cos(angle);
    particle.vy = velocity * sin(angle);
    particle.radius = 2;
    particle.red = firework.red;
    particle.green = firework.green;
    particle.blue = firework.blue;
    particles.push_back(particle);
  }
}
int main(){
  if(!glfwInit()){
    exit(EXIT_FAILURE);
  }
  GLFWwindow* window = glfwCreateWindow(640, 480, "Fireworks", NULL, NULL);
  if(!window){
    glfwTerminate();
    exit(EXIT_FAILURE);
  }
  glewExperimental = true;
  if(glewInit() != GLEW_OK){
    glfwTerminate();
    exit(EXIT_FAILURE);
  }
  srand(time(NULL));
  generateFirework(320, 50);
  while(!glfwWindowShouldClose(window)){
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glClear(GL_COLOR_BUFFER_BIT);
    for(int i=0; i<particles.size(); i++){
      particles[i].x += particles[i].vx * 0.1;
      particles[i].y += particles[i].vy * 0.1;
      particles[i].vx *= 0.985;
      particles[i].vy *= 0.985;
      glBegin(GL_POINTS);
      glColor3f(particles[i].red, particles[i].green, particles[i].blue);
      glVertex2f(particles[i].x, particles[i].y);
      glEnd();
    }
    for(int i=0; i<fireworks.size(); i++){
      fireworks[i].x += fireworks[i].vx * 0.1;
      fireworks[i].y += fireworks[i].vy * 0.1;
      fireworks[i].vy += 0.05;
      glBegin(GL_POINTS);
      glColor3f(fireworks[i].red, fireworks[i].green, fireworks[i].blue);
      glVertex2f(fireworks[i].x, fireworks[i].y);
      glEnd();
      if(fireworks[i].vy > 0 && !fireworks[i].exploded){
        explodeFirework(fireworks[i]);
        fireworks[i].exploded = true;
      }
    }
    for(int i=0; i<fireworks.size(); i++){
      if(fireworks[i].vy >= 0 && fireworks[i].exploded && particles.empty()){
        fireworks.erase(fireworks.begin() + i);
      }
    }
    glfwSwapBuffers(window);
    glfwPollEvents();
  }
  glfwDestroyWindow(window);
  glfwTerminate();
  exit(EXIT_SUCCESS);
}

以上便是使用C++实现烟花程序的简单过程，读者可以根据自己的需求进行修改和扩展。

  
  

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