六一专辑||C++实现动态烟花代码

首先，祝大家儿童节快乐！

在这篇文章中，将用烟花致以大家最好的祝福！

烟花代码将会用到 Easyx 图形库，可以去官网下载：easyx.cnhttp://easyx.cn/

代码思路

1 烟花结构体

2 初始化烟花

3 烟花上升

4 烟花爆炸

5 绘制烟花

不需要任何图片、音效（本来想加的，你要加自己加吧）

开始编写

提前声明：代码纯原创！

需要用到的头文件以及宏：

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#include #include #include #include #define MAXNUM 15 #define WIDTH 640 #define HEIGHT 480 #define PI 3.1415926

graphics.h Easyx图形库

math.h 计算烟花位置

time.h 选取随机种子

stdio.h 标准输入输出头文件

MAXNUM 烟花数量

WIDTH , HEIGHT 窗口的宽、高

PI 圆周率常量，结合数学库计算烟花位置

1 烟花结构体

定义的参数如下：

nowx , nowy 现在坐标

endy 爆炸高度

radio 爆炸半径

explode 爆炸进度

rgb[3] 烟花颜色rgb值

color 烟花颜色

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struct Fire {     int nowx;     int nowy;     int endy;     int radio;     int explode;     int rgb[3];     COLORREF color; }fire[MAXNUM];

2 初始化烟花

nowx , nowy 窗口外的随机位置

endy 随即高度

radio 随即半径

explode 一开始设为0

rgb[3] 一些特定的颜色随机取

color 按照rgb值

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void Init() {     for (int i = 0; i < MAXNUM; i++)     {         fire[i].nowx = rand() % WIDTH;         fire[i].nowy = HEIGHT + rand() % 250 + 50;         fire[i].endy = rand() % 100 + 10;         fire[i].radio = rand() % 50 + 120;         fire[i].explode = 0;         int c[][3] = { {255, 0, 0}, {210, 190, 255}, {255, 120, 0}, {255, 0, 150}, {255, 240, 100}, {10, 255, 255}, {160, 10, 255}, {255, 200, 60} };         int n = rand() % 8;         fire[i].color = RGB(c[n][0], c[n][1], c[n][2]);         fire[i].rgb[0] = c[n][0];         fire[i].rgb[1] = c[n][1];         fire[i].rgb[2] = c[n][2];     } }

3 烟花上升

y坐标 还没到达爆炸高度时一直上升

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for (int i = 0; i < MAXNUM; i++) {     if (fire[i].nowy > fire[i].endy)     {         fire[i].nowy -= 3;     } }

4 烟花爆炸

爆炸进度 explode 不断增加，如果到达爆炸半径，就重新初始化。（接上面的if语句）

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else {     if (fire[i].explode >= fire[i].radio)     {         fire[i].nowx = rand() % WIDTH;         fire[i].nowy = HEIGHT + rand() % 250 + 50;         fire[i].endy = rand() % 100 + 10;         fire[i].radio = rand() % 50 + 120;         fire[i].explode = 0;         int c[][3] = { {255, 0, 0}, {210, 190, 255}, {255, 120, 0}, {255, 0, 150}, {255, 240, 100}, {10, 255, 255}, {160, 10, 255}, {255, 200, 60} };         int n = rand() % 8;         fire[i].color = RGB(c[n][0], c[n][1], c[n][2]);         fire[i].rgb[0] = c[n][0];         fire[i].rgb[1] = c[n][1];         fire[i].rgb[2] = c[n][2];     }     else fire[i].explode++; }

5 绘制烟花

上升

绘制5个圆，大小从大到小，颜色从深到浅（增加rgb值)

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for (int i = 0; i < MAXNUM; i++) {     if (fire[i].nowy > fire[i].endy)     {         for (int size = 5; size > 0; size--)         {             int temp[] = { fire[i].rgb[0], fire[i].rgb[1], fire[i].rgb[2] };             for (int k = 0; k < 3; k++)             {                 temp[k] += 50 * (5 - size);                 if (temp[k] > 255) temp[k] = 255;             }             setfillcolor(RGB(temp[0], temp[1], temp[2]));             solidcircle(fire[i].nowx, fire[i].nowy + 15*(10 - size), size);         }     } }

爆炸

重头戏！重头戏！重头戏！需要一些简(fù)单(zá)的数(gāo)学(děng)常(shù)识(xúe)！

颜色渐变的实现方式跟前面一样，只不过这里要用三角函数计算坐标，再用万有引力、抛物线等改变 y坐标，让它看得更真实！（牛顿：算你小子识相）

然后是万有引力，大概需要高度乘以 0.98 ，这里就相当于减去 0.1

由于 easyx 坐标上方为 y = 0，所以，应该是：

1	y + (HEIGHT - y) * 0.1

再根据抛物线：y = x^2 ，修改一下就行了

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else {     for (int a = 0; a < 360; a += 30)     {         for (int size = 5; size > 0; size--)         {             int x = cos(a * PI / 180.0) * (fire[i].explode + size * 10) + fire[i].nowx;             int y = sin(a * PI / 180.0) * (fire[i].explode + size * 10) + fire[i].nowy + fire[i].radio / 2;             int temp[] = { fire[i].rgb[0], fire[i].rgb[1], fire[i].rgb[2] };             for (int k = 0; k < 3; k++)             {                 temp[k] += 50 * (5 - size);                 if (temp[k] > 255) temp[k] = 255;             }             setfillcolor(RGB(temp[0], temp[1], temp[2]));             solidcircle(x, y + (HEIGHT - y) * 0.1 + size * (size - 2), size);         }     } }

完整代码

最后，把函数封装一下，main 函数写出来（有手就行！）：

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/******************************* * 项目名称：新年烟花 * 开发环境：vs2022 + Easyx * 作者：轩 * 代码长度：137 行 * 完成时间：2023.1.20 * 用时:2.2 小时 *******************************/ #include #include #include #include #define MAXNUM 15 #define WIDTH 640 #define HEIGHT 480 #define PI 3.1415926 struct Fire {     int nowx;     int nowy;     int endy;     int radio;     int explode;     int rgb[3];     COLORREF color; }fire[MAXNUM]; void Init() {     for (int i = 0; i < MAXNUM; i++)     {         fire[i].nowx = rand() % WIDTH;         fire[i].nowy = HEIGHT + rand() % 250 + 50;         fire[i].endy = rand() % 100 + 10;         fire[i].radio = rand() % 50 + 120;         fire[i].explode = 0;         int c[][3] = { {255, 0, 0}, {210, 190, 255}, {255, 120, 0}, {255, 0, 150}, {255, 240, 100}, {10, 255, 255}, {160, 10, 255}, {255, 200, 60} };         int n = rand() % 8;         fire[i].color = RGB(c[n][0], c[n][1], c[n][2]);         fire[i].rgb[0] = c[n][0];         fire[i].rgb[1] = c[n][1];         fire[i].rgb[2] = c[n][2];     } } void Draw() {     for (int i = 0; i < MAXNUM; i++)     {         if (fire[i].nowy > fire[i].endy)         {             for (int size = 5; size > 0; size--)             {                 int temp[] = { fire[i].rgb[0], fire[i].rgb[1], fire[i].rgb[2] };                 for (int k = 0; k < 3; k++)                 {                     temp[k] += 50 * (5 - size);                     if (temp[k] > 255) temp[k] = 255;                 }                 setfillcolor(RGB(temp[0], temp[1], temp[2]));                 solidcircle(fire[i].nowx, fire[i].nowy + 15*(10 - size), size);             }         }         else         {             for (int a = 0; a < 360; a += 30)             {                 for (int size = 5; size > 0; size--)                 {                     int x = cos(a * PI / 180.0) * (fire[i].explode + size * 10) + fire[i].nowx;                     int y = sin(a * PI / 180.0) * (fire[i].explode + size * 10) + fire[i].nowy + fire[i].radio / 2;                     int temp[] = { fire[i].rgb[0], fire[i].rgb[1], fire[i].rgb[2] };                     for (int k = 0; k < 3; k++)                     {                         temp[k] += 50 * (5 - size);                         if (temp[k] > 255) temp[k] = 255;                     }                     setfillcolor(RGB(temp[0], temp[1], temp[2]));                     solidcircle(x, y + (HEIGHT - y) * 0.1 + size * (size - 2), size);                 }             }         }     } } void Move() {     for (int i = 0; i < MAXNUM; i++)     {         if (fire[i].nowy > fire[i].endy)         {             fire[i].nowy -= 3;         }         else         {             if (fire[i].explode >= fire[i].radio)             {                 fire[i].nowx = rand() % WIDTH;                 fire[i].nowy = HEIGHT + rand() % 250 + 50;                 fire[i].endy = rand() % 100 + 10;                 fire[i].radio = rand() % 50 + 120;                 fire[i].explode = 0;                 int c[][3] = { {255, 0, 0}, {210, 190, 255}, {255, 120, 0}, {255, 0, 150}, {255, 240, 100}, {10, 255, 255}, {160, 10, 255}, {255, 200, 60} };                 int n = rand() % 8;                 fire[i].color = RGB(c[n][0], c[n][1], c[n][2]);                 fire[i].rgb[0] = c[n][0];                 fire[i].rgb[1] = c[n][1];                 fire[i].rgb[2] = c[n][2];             }             else fire[i].explode++;         }     } } int main() {     srand(time(NULL));     initgraph(640, 480);     Init();     BeginBatchDraw();     while (true)     {         cleardevice();         Draw();         Move();         FlushBatchDraw();         Sleep(2);     }     EndBatchDraw();     closegraph();     return 0; }