#include <graphics.h> #include <conio.h>#include <stdio.h>#define PIC_HEIGHT 600#define PIC_WIDTH 800void FrameFun();
// 帧逻辑函数，处理每一帧的逻辑void RenderFun();
// 帧渲染函数，输出每一帧到显示设备IMAGE src_img;
// 原位图 IMAGE dest_img(PIC_WIDTH, PIC_HEIGHT);
// 处理后显示的位图DWORD *img_ptr1;
// 原图片片内存指针DWORD *img_ptr2;
// 处理后显示的位图内存指针// 以下两个 buf 为每一个点的波幅，前者为当前波幅，后者为下一个时刻的波幅。short *buf = new short[PIC_HEIGHT*PIC_WIDTH+PIC_WIDTH];
short *buf2 = new short[PIC_HEIGHT*PIC_WIDTH+PIC_WIDTH];
void main(){
// 初始化设备，加载图片 initgraph(PIC_WIDTH, PIC_HEIGHT);
SetWindowText(GetHWnd(), "Wave-水波纹效果（点击产生一个水波纹。移动鼠标连续产生水波纹）");
loadimage(&src_img, "water.jpg");
// 加载图片，大小：800*600 setbkmode(TRANSPARENT);
settextcolor(BLACK);
setfont(25, 0, "Arial");
// 获得内存指针 img_ptr1 = GetImageBuffer(&src_img);
img_ptr2 = GetImageBuffer(&dest_img);
// 初始化波幅数组 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();
// 双缓冲，闪屏时需要 while(true) {
FrameFun();
RenderFun();
FlushBatchDraw();
Sleep(1);
}
EndBatchDraw();
}
// 计算出下一个时刻所有点的波幅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];
// 波能衰减 buf2[i] -= buf2[i] >> 5;
}
short *ptmp = buf;
buf = buf2;
buf2 = ptmp;
}
// 处理当前时刻波幅影响之后的位图，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;
// 边界处理 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;
// 处理偏移 img_ptr2[i] = img_ptr1[a + (b * PIC_WIDTH)];
i++;
}
}
}
// 鼠标模拟投石头// 参数说明：// (x, y): 鼠标坐标// stonesize: “石头”的大小// stoneweight: 投“石头”的力度// Ps: 如果产生错误，一般就是数组越界所致，请酌情调整“石头”的大小和“石头”的力度void disturb(int x, int y, int stonesize, int stoneweight) {
// 突破边界不处理 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;
}
}
}
}
// 计算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);
}
// 逻辑void FrameFun() {
// 鼠标 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();
}
// 计算下一帧的波幅 nextFrame();
}