#include <graphics.h>   #include <conio.h>#include <stdio.h>#define PIC_HEIGHT 600#define PIC_WIDTH 800void FrameFun();     // 幀邏輯函數，處理每一幀的邏輯void RenderFun();     // 幀渲染函數，輸出每一幀到顯示設備IMAGE src_img;     // 原位圖 IMAGE dest_img(PIC_WIDTH, PIC_HEIGHT);  // 處理后顯示的位圖DWORD *img_ptr1;     // 原圖片片內存指針DWORD *img_ptr2;     // 處理后顯示的位圖內存指針// 以下兩個 buf 為每一個點的波幅，前者為當前波幅，后者為下一個時刻的波幅。short *buf = new short[PIC_HEIGHT*PIC_WIDTH+PIC_WIDTH];short *buf2 = new short[PIC_HEIGHT*PIC_WIDTH+PIC_WIDTH];void main(){ // 初始化設備，加載圖片  initgraph(PIC_WIDTH, PIC_HEIGHT);  SetWindowText(GetHWnd(), "Wave-水波紋效果（點擊產生一個水波紋。移動鼠標連續產生水波紋）");  loadimage(&src_img, "water.jpg"); // 加載圖片，大小：800*600 setbkmode(TRANSPARENT); settextcolor(BLACK); setfont(25, 0, "Arial"); // 獲得內存指針 img_ptr1 = GetImageBuffer(&src_img); img_ptr2 = GetImageBuffer(&dest_img); // 初始化波幅數組 memset(buf, 0, (PIC_HEIGHT*PIC_WIDTH+PIC_WIDTH) * sizeof(short)); memset(buf2, 0, (PIC_HEIGHT*PIC_WIDTH+PIC_WIDTH) * sizeof(short)); // Let's Go! BeginBatchDraw(); // 雙緩沖，閃屏時需要 while(true)  { FrameFun(); RenderFun(); FlushBatchDraw(); Sleep(1); } EndBatchDraw();}// 計算出下一個時刻所有點的波幅void nextFrame(){ for(int i = PIC_WIDTH; i < PIC_HEIGHT*(PIC_WIDTH-1); i++) { // 公式：X0'= (X1+X2+X3+X4) / 2 - X0 buf2[i] = ((buf[i-PIC_WIDTH] + buf[i+PIC_WIDTH] + buf[i-1] + buf[i+1]) >> 1) - buf2[i]; // 波能衰減 buf2[i] -= buf2[i] >> 5; } short *ptmp = buf; buf = buf2; buf2 = ptmp;}// 處理當前時刻波幅影響之后的位圖，保存在 dest_img 中void RenderRipple(){ int i = 0; for (int y = 0; y < PIC_HEIGHT; y++)  {  for (int x = 0; x < PIC_WIDTH; x++)   {  short data = 1024 - buf[i];  // 偏移  int a = ((x - PIC_WIDTH / 2) * data / 1024) + PIC_WIDTH / 2;  int b = ((y - PIC_HEIGHT / 2) * data / 1024) + PIC_HEIGHT / 2;  // 邊界處理  if (a >= PIC_WIDTH) a = PIC_WIDTH - 1;  if (a < 0)  a = 0;  if (b >= PIC_HEIGHT) b = PIC_HEIGHT - 1;  if (b < 0)  b = 0;    // 處理偏移   img_ptr2[i] = img_ptr1[a + (b * PIC_WIDTH)];  i++;  } }}// 鼠標模擬投石頭// 參數說明：// (x, y): 鼠標坐標// stonesize: “石頭”的大小// stoneweight: 投“石頭”的力度// Ps: 如果產生錯誤，一般就是數組越界所致，請酌情調整“石頭”的大小和“石頭”的力度void disturb(int x, int y, int stonesize, int stoneweight) { // 突破邊界不處理 if ((x >= PIC_WIDTH - stonesize) || (x < stonesize) || (y >= PIC_HEIGHT - stonesize) || (y < stonesize)) return; for (int posx=x-stonesize; posx<x+stonesize; posx++) { for (int posy=y-stonesize; posy<y+stonesize; posy++) {  if ((posx-x)*(posx-x) + (posy-y)*(posy-y) < stonesize*stonesize)  {  buf[PIC_WIDTH*posy+posx] += stoneweight;  } } }}// 計算fpsfloat getFps(){#define FPS_COUNT 8 static i = 0; static oldTime = GetTickCount(); static float fps; if (i > FPS_COUNT) { i = 0; int newTime = GetTickCount(); int elapsedTime = newTime - oldTime; fps = FPS_COUNT / (elapsedTime / 1000.0f); oldTime = newTime; } i++; return fps;}// 渲染void RenderFun(){ RenderRipple(); putimage(0, 0, &dest_img); char s[5]; sprintf(s, "%.1f", getFps()); outtextxy(0, 0, s);}// 邏輯void FrameFun() { // 鼠標 if(MouseHit()) { MOUSEMSG msg = GetMouseMsg(); if(msg.uMsg == WM_MOUSEMOVE) {  disturb(msg.x, msg.y, 3, 256); }  else if(msg.uMsg == WM_LBUTTONDOWN) {  disturb(msg.x, msg.y, 3, 2560);   } FlushMouseMsgBuffer(); } // 計算下一幀的波幅 nextFrame();}