c语言力学相关的流体源（C语言课程设计）.rar

#include <graphics.h> #include <math.h> #include <time.h> /* 【自学去】网站收集 http://www.zixue7.com */ #define WIDTH 1024 // 屏幕宽 #define HEIGHT 576 // 屏幕高 #define NUM_MOVERS 600 // 小球数量 #define FRICTION 0.96f // 摩擦力 // 定义小球结构 struct Mover { COLORREF color; // 颜色 float x, y; // 坐标 float vX, vY; // 速度 }; // 定义全局变量 Mover movers[NUM_MOVERS]; // 小球数组 int mouseX, mouseY; // 当前鼠标坐标 int mouseVX, mouseVY; // 鼠标速度 int prevMouseX, prevMouseY; // 上次鼠标坐标 bool isMouseDown; // 鼠标左键是否按下 DWORD* pBuffer; // 显存指针 // 初始化 void init() { // 初始化小球数组 for (int i = 0; i < NUM_MOVERS; i++) { movers[i].color = RGB(rand() % 256, rand() % 256, rand() % 256); movers[i].x = WIDTH * 0.5; movers[i].y = HEIGHT * 0.5; movers[i].vX = float(cos(float(i))) * (rand() % 34); movers[i].vY = float(sin(float(i))) * (rand() % 34); } // 初始化鼠标变量 mouseX = prevMouseX = WIDTH / 2; mouseY = prevMouseY = HEIGHT / 2; // 设置随机种子 srand((unsigned int)time(NULL)); // 获取显存指针 pBuffer = GetImageBuffer(NULL); } // 全屏变暗 50% void darken() { for(int i = WIDTH * HEIGHT - 1; i >= 0; i--) if (pBuffer[i] != 0) pBuffer[i] = RGB(GetRValue(pBuffer[i]) >> 1, GetGValue(pBuffer[i]) >> 1, GetBValue(pBuffer[i]) >> 1); } // 绝对延时 void delay(DWORD ms) { static DWORD oldtime = GetTickCount(); while(GetTickCount() - oldtime < ms) Sleep(1); oldtime = GetTickCount(); } // 绘制动画(一帧) void run() { darken(); // 全屏变暗 mouseVX = mouseX - prevMouseX; mouseVY = mouseY - prevMouseY; prevMouseX = mouseX; prevMouseY = mouseY; float toDist = WIDTH * 0.86f; float stirDist = WIDTH * 0.125f; float blowDist = WIDTH * 0.5f; for(int i = 0; i < NUM_MOVERS; i++) { float x = movers[i].x; float y = movers[i].y; float vX = movers[i].vX; float vY = movers[i].vY; float dX = x - mouseX; float dY = y - mouseY; float d = (float)sqrt(dX * dX + dY * dY); dX = d ? dX / d : 0; dY = d ? dY / d : 0; if (isMouseDown && d < blowDist) { float blowAcc = (1 - (d / blowDist)) * 14; vX += dX * blowAcc + 0.5f - float(rand()) / RAND_MAX; vY += dY * blowAcc + 0.5f - float(rand()) / RAND_MAX; } if (d < toDist) { float toAcc = (1 - (d / toDist)) * WIDTH * 0.0014f; vX -= dX * toAcc; vY -= dY * toAcc; } if (d < stirDist) { float mAcc = (1 - (d / stirDist)) * WIDTH * 0.00026f; vX += mouseVX * mAcc; vY += mouseVY * mAcc; } vX *= FRICTION; vY *= FRICTION; float avgVX = (float)fabs(vX); float avgVY = (float)fabs(vY); float avgV = (avgVX + avgVY) * 0.5f; if (avgVX < 0.1) vX *= float(rand()) / RAND_MAX * 3; if (avgVY < 0.1) vY *= float(rand()) / RAND_MAX * 3; float sc = avgV * 0.45f; sc = max(min(sc, 3.5f), 0.4f); float nextX = x + vX; float nextY = y + vY; if (nextX > WIDTH) { nextX = WIDTH; vX *= -1; } else if (nextX < 0) { nextX = 0; vX *= -1; } if (nextY > HEIGHT){ nextY = HEIGHT; vY *= -1; } else if (nextY < 0) { nextY = 0; vY *= -1; } movers[i].vX = vX; movers[i].vY = vY; movers[i].x = nextX; movers[i].y = nextY; // 画小球 setcolor(movers[i].color); setfillstyle(movers[i].color); fillcircle(int(nextX + 0.5), int(nextY + 0.5), int(sc + 0.5)); } } // 主函数 void main() { // 创建绘图窗口 initgraph(WIDTH, HEIGHT); // 启用批绘图模式 BeginBatchDraw(); // 初始化 init(); // 鼠标消息变量 MOUSEMSG m; while(true) { // 处理鼠标消息 while(MouseHit()) { m = GetMouseMsg(); switch(m.uMsg) { case WM_MOUSEMOVE: mouseX = m.x; mouseY = m.y; break; case WM_LBUTTONDOWN: isMouseDown = true; break; case WM_LBUTTONUP: isMouseDown = false; break; } } // 绘制动画 run(); // 显示缓存的绘制内容 FlushBatchDraw(); // 延时 20 毫秒 delay(20); } // 关闭 EndBatchDraw(); closegraph(); }