一、项目介绍这是一个用C语言实现的雪花飘落小程序。背景图片可自行替换用作表白。编译环境：Visual Studio2019第三方库：Easyx2022 注意需要提前安装easyX，如没有基础可以先了解easyX图形编程二、运行截图

三、完整源码/Love Snow 需要自己提供一张大小为 800×600 的图片(img.jpg)在工程文件夹根目录下 大小可以在程序内更改，图片名字也可以。 /define MAX_STAR 500// 雪花数量上限define SCREEN_HEIGHT 600// 屏幕高度define MAX_RADIUS 5// 雪花最大半径#define IMGNAME _T("img.jpg")// 图片名字using namespace std;// 图片转数组（这个有很大优化空间的，需要识别彩色照片可以看这）int imgList[SCREEN_HEIGHT][SCREEN_WIDTH] = { 0 };// 雪花状态enum STATUS{STOP = 0,// 不动UP,// 向上DOWN,// 向下LEFT,// 向左RIGHT,// 向右RANDOM,// 随机ALL_STATUS// 记录状态总数};struct STAR{int x;// 雪花的 x 坐标int y;// 雪花的 y 坐标enum STATUS stat;// 雪花状态unsigned radius;// 雪花的半径int step;// 雪花每次移动的步长int color;// 雪花的颜色};struct SqList{struct STAR* elems; // 顺序表的基地址int length;// 顺序表的长度int size;// 顺序表的空间};// 顺序表的接口bool initList(SqList& L);bool listAppend(SqList& L, struct STAR e);bool listDelete(SqList& L, int i);void destroyList(SqList& L);bool initList(SqList& L){L.elems = new struct STAR[MAX_STAR];if (!L.elems) return false;L.length = 0;L.size = MAX_STAR;return true;}bool listAppend(SqList& L, struct STAR e){if (L.length == L.size) return false;// 存储空间已满L.elems[L.length] = e;L.length++;// 表长加 1return true;}bool listDelete(SqList& L, int i){if (i < 0 || i >= L.length) return false;if (i == L.length - 1){// 删除最后一个元素L.length--;return true;}for (int j = i; j < L.length - 1; j++){L.elems[j] = L.elems[j + 1];// 删除位置的后续元素一次往前移}L.length--;return true;}void destroyList(SqList& L){if (L.elems) delete[]L.elems;// 释放存储空间L.length = 0;L.size = 0;}/ 功能：移动雪花，并在指定区域留下雪痕 输入参数： L - 雪花对象 i - 雪花在全局数组中的下标* 返回值：无****/void MoveStar(SqList& L, int i){// 留下雪痕if (L.elems[i].stat == DOWN){if (imgList[L.elems[i].y][L.elems[i].x] == 1){L.elems[i].y += L.elems[i].step;L.elems[i].x -= 2;}}if (L.elems[i].stat == UP){if (imgList[L.elems[i].y][L.elems[i].x] == 1){L.elems[i].y -= L.elems[i].step;L.elems[i].x -= 2;}}if (L.elems[i].stat == LEFT){if (imgList[L.elems[i].y][L.elems[i].x] == 1) L.elems[i].x -= L.elems[i].step;}if (L.elems[i].stat == RIGHT){if (imgList[L.elems[i].y][L.elems[i].x] == 1) L.elems[i].x += L.elems[i].step;}if (L.elems[i].stat == STOP) return;// 擦除原来的雪花setfillcolor(BLACK);solidcircle(L.elems[i].x, L.elems[i].y, L.elems[i].radius);if (L.elems[i].stat == DOWN){L.elems[i].y += L.elems[i].step;L.elems[i].x -= 2;if (L.elems[i].x < 0) L.elems[i].x = SCREEN_WIDTH;if (L.elems[i].y > SCREEN_HEIGHT) L.elems[i].y = 0;//if(L.elems[i].y>SCREEN_HEIGHT) listDelete(L, i);// 这段代码可以让飘出屏幕外的雪花消亡}else if (L.elems[i].stat == UP){L.elems[i].y -= L.elems[i].step;L.elems[i].x -= 2;if (L.elems[i].x < 0) L.elems[i].x = SCREEN_WIDTH;if (L.elems[i].y < 0) L.elems[i].y = SCREEN_HEIGHT;//if(L.elems[i].y 0) L.elems[i].x = SCREEN_WIDTH;//if(L.elems[i].x SCREEN_HEIGHT) L.elems[i].x = 0;//if(L.elems[i].x>SCREEN_WIDTH) listDelete(L, i);}setfillcolor(L.elems[i].color);solidcircle(L.elems[i].x, L.elems[i].y, L.elems[i].radius);}/* 功能：初始化雪花 输入参数： i - 雪花在全局数组中的下标* 返回值：无****/void initStar(struct STAR& _star){int rgb = 0;//rand() 得到随机数范围 0 - 32767 RAND_MAX_star.x = rand() % SCREEN_WIDTH;// x 范围 0 - SCREEN_WIDTH_star.y = rand() % SCREEN_HEIGHT;// y 范围 0 - SCREEN_HEIGHT//_star.stat = STATUS(rand() % 6);// 雪花状态：随机_star.stat = DOWN;// 雪花状态：向下_star.radius = 1 + rand() % MAX_RADIUS; // 半径控制 1 - MAX_RADIUS_star.step = rand() % MAX_STEP + 1;// 步长 1 - MAX_STEPrgb = 255 * _star.step / MAX_STEP;// RGB：0 - 255_star.color = RGB(rgb, rgb, rgb);}int main(){bool quit = false;struct STAR star;SqList starList;// 初始化屏幕initgraph(SCREEN_WIDTH, SCREEN_HEIGHT);// 初始化图片IMAGE img;loadimage(&img, IMGNAME);SetWorkingImage(&img);// 设置 img为绘制设备COLORREF color;// 记录像素颜色BYTE r, b, g;// 记录像素RGBfor (int y = 0; y < SCREEN_HEIGHT; y++){for (int x = 0; x < SCREEN_WIDTH; x++){color = getpixel(x, y);// 获取像素颜色r = GetRValue(color);b = GetBValue(color);g = GetGValue(color);if (r < 200 && b < 200 && g < 200){// 判断需留下“雪痕”的数组位置imgList[y][x] = 1;}}}SetWorkingImage();// 设置回默认绘制设备cleardevice();// 初始化保存雪花状态的顺序表initList(starList);for (int i = 0; i < MAX_STAR; i++){initStar(star);listAppend(starList, star);}for (int i = 0; i < starList.length; i++){setfillcolor(starList.elems[i].color);solidcircle(starList.elems[i].x, starList.elems[i].y,starList.elems[i].radius);}while (quit == false){for (int i = 0; i < starList.length; i++){MoveStar(starList, i);}if (starList.length == 0){// 若设置雪花离开屏幕后消亡，则会触发此退出quit = true;}Sleep(50);}system("pause");closegraph();return 0;}