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This article will explain in detail how to realize the fireworks confession program in C language. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Effect picture

Thoughts on the effect of fireworks explosion

The picture of fireworks can not be pasted directly into the window. The pixels of fireworks need to be saved in a two-dimensional array, and the fireworks are output to the position of explosion in the window with the same radius. R starts from 0, increases continuously and outputs in circles, so as to achieve the effect of explosion.

The position where the fireworks explode in the window is (XPY), that is, the maximum height at which the fireworks rise.

The center of the fireworks is (cx,cy), the radius of the fireworks is r, and the coordinates of each point on the circle are obtained: the parameter equation of the circle: x=a+r*cos θ y=b+r*sin θ (θ ∈ [0pr 2 π)) (aline b) is the coordinate of the center, r is the radius of the circle, θ is the parameter, (XCoE y) is the coordinate of the passing point.

Pay attention to the difference between the equation coordinate system and the window coordinate system. The circle parameter equation of the window coordinate system should be: x=a+r*cos θ y=b-r*sin θ

Code # include # pragma comment (lib "Winmm.lib") / * Macro definition area * / # define NUM 13 / / fireworks species and quantity Macro definition # define PI 3.1415926548 * structure definition area * / / fireworks structure struct FIRE {int r / / current explosion radius int max_r; / / maximum radius from the explosion center to the edge int x, y; / / the coordinates of the explosion center in the window int cen_x, cen_y / / the int width of the explosion center relative to the coordinates of the upper left corner of the image, height; / / the width and height of the image int xy [240] [240]; / / storing the image pixel bool show; / / whether to bloom bool draw / / start outputting pixel DWORD T1, T2, dt; / / blooming speed} Fire [NUM]; / / fireworks projectile structure struct JET {int x, y; / / injection point coordinates int hx, hy / / highest point coordinates-will be assigned to x, y int height; / / fireworks height bool shoot; / / whether DWORD T1, T2, dt can be emitted in FIRE / / launch speed IMAGE img [2]; / / store a bright and dark picture byte n: 1; / / picture subscript} Jet [NUM]; / * function declaration area * * / void welcome (); void Init (int) / / initialize fireworks void Load (); / / load fireworks picture void Shoot (); / / launch fireworks void Chose (DWORD&); / / screen fireworks void Style (DWORD&); / / launch style void Show (DWORD*) / / display fireworks / / main function void main () {initgraph (1200); srand (time (0)); DWORD T1 = timeGetTime (); / / screen fireworks timing DWORD st1 = timeGetTime (); / / play pattern timing DWORD* pMem = GetImageBuffer () / / get the window video memory pointer for (int I = 0; I

< NUM; i++) // 初始化烟花 { Init(i); } Load(); // 将烟花图片信息加载进相应结构中 BeginBatchDraw(); // 开始批量绘图 while (!kbhit()) { Sleep(10); // 随机选择 4000 个像素点擦除 for (int clr = 0; clr < 1000; clr++) { for (int j = 0; j < 2; j++) { int px1 = rand() % 1200; int py1 = rand() % 800; if (py1 < 799) // 防止越界 pMem[py1 * 1200 + px1] = pMem[py1 * 1200 + px1 + 1] = BLACK; // 对显存赋值擦出像素点 } } Chose(t1); // 筛选烟花 Shoot(); // 发射烟花 Show(pMem); // 绽放烟花 Style(st1); // 花样发射 FlushBatchDraw(); // 显示前面的所有绘图操作 }}// 初始化烟花参数void Init(int i){ // 分别为：烟花中心到图片边缘的最远距离、烟花中心到图片左上角的距离 (x、y) 两个分量 int r[13] = { 120, 120, 155, 123, 130, 147, 138, 138, 130, 135, 140, 132, 155 }; int x[13] = { 120, 120, 110, 117, 110, 93, 102, 102, 110, 105, 100, 108, 110 }; int y[13] = { 120, 120, 85, 118, 120, 103, 105, 110, 110, 120, 120, 104, 85 }; /**** 初始化烟花 *****/ Fire[i].x = 0; // 烟花中心坐标 Fire[i].y = 0; Fire[i].width = 240; // 图片宽 Fire[i].height = 240; // 图片高 Fire[i].max_r = r[i]; // 最大半径 Fire[i].cen_x = x[i]; // 中心距左上角距离 Fire[i].cen_y = y[i]; Fire[i].show = false; // 是否绽放 Fire[i].dt = 5; // 绽放时间间隔 Fire[i].t1 = timeGetTime(); Fire[i].r = 0; // 从 0 开始绽放 /**** 初始化烟花弹 *****/ Jet[i].x = -240; // 烟花弹左上角坐标 Jet[i].y = -240; Jet[i].hx = -240; // 烟花弹发射最高点坐标 Jet[i].hy = -240; Jet[i].height = 0; // 发射高度 Jet[i].t1 = timeGetTime(); Jet[i].dt = rand() % 10; // 发射速度时间间隔 Jet[i].n = 0; // 烟花弹闪烁图片下标 Jet[i].shoot = false; // 是否发射}// 加载图片void Load(){ /**** 储存烟花的像素点颜色 ****/ IMAGE fm, gm; loadimage(&fm, "./fire/flower.jpg", 3120, 240); for (int i = 0; i < 13; i++) { SetWorkingImage(&fm); getimage(&gm, i * 240, 0, 240, 240); SetWorkingImage(&gm); for (int a = 0; a < 240; a++) for (int b = 0; b < 240; b++) Fire[i].xy[a][b] = getpixel(a, b); } /**** 加载烟花弹 ************/ IMAGE sm; loadimage(&sm, "./fire/shoot.jpg", 200, 50); for (int i = 0; i < 13; i++) { SetWorkingImage(&sm); int n = rand() % 5; getimage(&Jet[i].img[0], n * 20, 0, 20, 50); // 暗 getimage(&Jet[i].img[1], (n + 5) * 20, 0, 20, 50); // 亮 } SetWorkingImage(); // 设置回绘图窗口}// 在一定范围内筛选可发射的烟花，并初始化发射参数，输出烟花弹到屏幕，播放声音void Chose(DWORD& t1){ DWORD t2 = timeGetTime(); if (t2 - t1 >

) {int n = rand () 20; if (n)

< 13 && Jet[n].shoot == false && Fire[n].show == false) { /**** 重置烟花弹，预备发射 *****/ Jet[n].x = rand() % 1200; Jet[n].y = rand() % 100 + 600; Jet[n].hx = Jet[n].x; Jet[n].hy = rand() % 400; Jet[n].height = Jet[n].y - Jet[n].hy; Jet[n].shoot = true; putimage(Jet[n].x, Jet[n].y, &Jet[n].img[Jet[n].n], SRCINVERT); /**** 播放每个烟花弹的声音 *****/ char c1[50], c2[30], c3[30]; sprintf(c1, "open ./fire/shoot.mp3 alias s%d", n); sprintf(c2, "play s%d", n); sprintf(c3, "close n%d", n); mciSendString(c3, 0, 0, 0); mciSendString(c1, 0, 0, 0); mciSendString(c2, 0, 0, 0); } t1 = t2; }}// 扫描烟花弹并发射void Shoot(){ for (int i = 0; i < 13; i++) { Jet[i].t2 = timeGetTime(); if (Jet[i].t2 - Jet[i].t1 >

True [I] .dt & & Jet [I] .fireworks bomb rise * / putimage (Jet [I] .x, Jet [I] .y, & Jet [I] .img [Jet [I] .n], SRCINVERT) If (Jet [I] .y > Jet [I] .hy) {Jet [I] .n + +; Jet [I] .y-= 5 } putimage (Jet [I] .x, Jet [I] .y, & Jet [I] .img [Jet [I] .n], SRCINVERT); / * rise to 3 / 4 of height, decelerate * / if ((Jet [I]. Y-Jet [I] .hy) * 4

< Jet[i].height) Jet[i].dt = rand() % 4 + 10; /**** 上升到最大高度 *****/ if (Jet[i].y 20000) // 一首歌的时间 { // 心形坐标 int x[13] = { 60, 75, 91, 100, 95, 75, 60, 45, 25, 15, 25, 41, 60 }; int y[13] = { 65, 53, 40, 22, 5, 4, 20, 4, 5, 22, 40, 53, 65 }; for (int i = 0; i < NUM; i++) { //cleardevice(); /**** 规律分布烟花弹 ***/ Jet[i].x = x[i] * 10; Jet[i].y = (y[i] + 75) * 10; Jet[i].hx = Jet[i].x; Jet[i].hy = y[i] * 10; Jet[i].height = Jet[i].y - Jet[i].hy; Jet[i].shoot = true; Jet[i].dt = 7; putimage(Jet[i].x, Jet[i].y, &Jet[i].img[Jet[i].n], SRCINVERT); // 显示烟花弹 /**** 设置烟花参数 ***/ Fire[i].x = Jet[i].x + 10; Fire[i].y = Jet[i].hy; Fire[i].show = false; Fire[i].r = 0; /**** 播放发射声音 ***/ char c1[50], c2[30], c3[30]; sprintf(c1, "open ./fire/shoot.mp3 alias s%d", i); sprintf(c2, "play s%d", i); sprintf(c3, "close n%d", i); mciSendString(c3, 0, 0, 0); mciSendString(c1, 0, 0, 0); mciSendString(c2, 0, 0, 0); } st1 = st2; }}// 绽放烟花void Show(DWORD* pMem){ // 烟花个阶段绽放时间间隔，制作变速绽放效果 int drt[16] = { 5, 5, 5, 5, 5, 6, 25, 25, 25, 25, 55, 55, 55, 55, 55 }; for (int i = 0; i < NUM; i++) { Fire[i].t2 = timeGetTime(); // 增加爆炸半径，绽放烟花，增加时间间隔做变速效果 if (Fire[i].t2 - Fire[i].t1 >

Fire [I] .dt & & fire [I] .show = = true) {if (fire [I] .r

< Fire[i].max_r) { Fire[i].r++; Fire[i].dt = drt[Fire[i].r / 10]; Fire[i].draw = true; } if (Fire[i].r >

= Fire[ I] .max _ r-1) {Fire[ I] .draw = false; Init (I);} Fire[ I] .t1 = Fire[ I] .T2 } / / if the fireworks can explode, draw fireworks according to the current explosion radius, and do not output if the color value is close to black. If (fire[ I]. Draw) {/ / 628 times 2 π x1y1 get 628 pixel coordinates for (double a = 0; a 0 & & x1) from the picture.

< Fire[i].width && y1 >

0 & & Y1

< Fire[i].height) // 只输出图片内的像素点 { int b = Fire[i].xy[x1][y1] & 0xff; int g = (Fire[i].xy[x1][y1] >

> 8) & 0xff; int r = (fireworks [I] .XY [x1] [y1] > > 16); / / coordinates of fireworks pixels on the window int xx = (int) (Fire[ I] .x + fireworks [I] .r * cos (a)) Int yy = (int) (Fire [I]. Y-Fire [I]. R * sin (a)); / / darker pixels are not output to prevent if from crossing the boundary (r > 0x20 & & g > 0x20 & b > 0x20 & & xx > 0 & & xx

< 1200 && yy >

0 & & yy < 800) pMem [yy * 1200 + xx] = BGR (Fire[ I] .XY [x1] [y1]); / / display memory operation to draw fireworks}} fireworks. Draw = false }} material

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