旋转的三叶风车的vc++程序

#include <windows.h> #include <stdlib.h> #include <string.h> #include <math.h> #define PI 3.1415926 int nNum=0,nMaxNum=20; LRESULT CALLBACK WindowProc( HWND hwnd, // handle to window UINT uMsg, // message identifier WPARAM wParam, // first message parameter LPARAM lParam // second message parameter ); int WINAPI WinMain( HINSTANCE hInstance, // handle to current instance HINSTANCE hPrevInstance, // handle to previous instance LPSTR lpCmdLine, // command line int nCmdShow // show state ) { HWND hwnd; MSG Msg; WNDCLASS wndclass; wndclass.cbClsExtra=0; wndclass.cbWndExtra=0; wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH); wndclass.hCursor=LoadCursor(NULL,IDC_ARROW); wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION); wndclass.hInstance=hInstance; wndclass.lpfnWndProc=WindowProc; wndclass.lpszClassName="abc"; wndclass.lpszMenuName=NULL; wndclass.style=0; RegisterClass(&wndclass); hwnd=CreateWindow("abc","旋转的风车",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,0,600,450,NULL,NULL,hInstance,NULL); ShowWindow(hwnd,SW_SHOWNORMAL); UpdateWindow(hwnd); while(GetMessage(&Msg,hwnd,NULL,0)) { TranslateMessage(&Msg); DispatchMessage(&Msg); } return 0; } LRESULT CALLBACK WindowProc( HWND hwnd, // handle to window UINT uMsg, // message identifier WPARAM wParam, // first message parameter LPARAM lParam // second message parameter ) { HDC hdc; HBRUSH hBrush; HPEN hp; PAINTSTRUCT ps; int nCenterX,nCenterY; double fAngle; switch(uMsg) { case WM_PAINT: hdc=BeginPaint(hwnd,&ps); SetMapMode(hdc,MM_ANISOTROPIC); SetWindowExtEx(hdc,400,300,NULL); SetViewportExtEx(hdc,600,450,NULL); SetViewportOrgEx(hdc,300,200,NULL); // 绘制外圆 hp=CreatePen(PS_SOLID,1,RGB(255,0,255)); SelectObject(hdc,hp); Ellipse(hdc,-100,-100,100,100); // 绘制风车的叶片 // 绘制红色的叶片 hBrush=CreateSolidBrush(RGB(255,0,0)); SelectObject(hdc,hBrush); fAngle=2*PI/nMaxNum*nNum; nCenterX=(int)(50*cos(fAngle)); nCenterY=(int)(50*sin(fAngle)); Pie(hdc,nCenterX-50,nCenterY-50,nCenterX+50,nCenterY+50,(int)(nCenterX+50*cos(fAngle)),(int)(nCenterY+50*sin(fAngle)),(int)(nCenterX+50*cos(fAngle+PI)),(int)(nCenterY+50*sin(fAngle+PI))); // 绘制蓝色的叶片 hBrush=CreateSolidBrush(RGB(255,255,0)); SelectObject(hdc,hBrush); nCenterX=(int)(50*cos(fAngle+2*PI/3)); nCenterY=(int)(50*sin(fAngle+2*PI/3)); Pie(hdc,nCenterX-50,nCenterY-50,nCenterX+50,nCenterY+50,(int)(nCenterX+50*cos(fAngle+2*PI/3)),(int)(nCenterY+50*sin(fAngle+2*PI/3)),(int)(nCenterX+50*cos(fAngle+PI+2*PI/3)),(int)(nCenterY+50*sin(fAngle+PI+2*PI/3))); // 绘制黄色的叶片 hBrush=CreateSolidBrush(RGB(0,255,255)); SelectObject(hdc,hBrush); nCenterX=(int)(50*cos(fAngle+4*PI/3)); nCenterY=(int)(50*sin(fAngle+4*PI/3)); Pie(hdc,nCenterX-50,nCenterY-50,nCenterX+50,nCenterY+50,(int)(nCenterX+50*cos(fAngle+4*PI/3)),(int)(nCenterY+50*sin(fAngle+4*PI/3)),(int)(nCenterX+50*cos(fAngle+PI+4*PI/3)),(int)(nCenterY+50*sin(fAngle+PI+4*PI/3))); nNum++; Sleep(100); InvalidateRect(hwnd,NULL,1); EndPaint(hwnd,&ps); return 0; case WM_CLOSE: PostQuitMessage(0); break; default: return DefWindowProc(hwnd,uMsg,wParam,lParam); } return 0; }