wubianxing.rar_绘制 五边形

#include <windows.h> #include <stdlib.h> #include <string.h> #include <math.h> #define Pi 3.1415926 long WINAPI WndProc(HWND hWnd, UINT iMessage, UINT wParam, LONG lParam); //消息处理函数声明. int nNum = 0,nMaxNum = 20; //nMaxNum记录了叶片循环一周中绘图的次数. //nNum记录了当前的序数. int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) //主函数 { MSG Message; //定义消息变量. HWND hWnd; //定义窗口句柄. WNDCLASS WndClass; //定义窗口类. WndClass.cbClsExtra=0; //无窗口类扩展. WndClass.cbWndExtra=0; //无窗口实例扩展. WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH));//背景为白色. WndClass.hCursor=LoadCursor(NULL,IDC_ARROW); //窗口采用箭头光标. WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION); //采用缺省图标. WndClass.hInstance=hInstance; //当前应用程序句柄. WndClass.lpfnWndProc=WndProc; //窗口处理函数. WndClass.lpszClassName="4_8"; //窗口类名称. WndClass.lpszMenuName="缩放"; //无窗口菜单. WndClass.style=0; //窗口类型为缺省类型. if(!RegisterClass(&WndClass)) //注册窗口. { MessageBeep(0); return FALSE; } hWnd=CreateWindow("4_8", //窗口类名. "风车", //标题名. WS_OVERLAPPEDWINDOW, //带标题栏,最大和最小按钮的窗口. CW_USEDEFAULT, //窗口左上角坐标. 0, 600, //采用宽度为450，高度为600. 450, NULL, //无父窗口. NULL, //无主菜单. hInstance, //当前实例句柄. NULL); //不要此参数. ShowWindow(hWnd,nCmdShow); //显示窗口. UpdateWindow(hWnd); //更新并绘制用户区. while(GetMessage(&Message,0,0,0)) { TranslateMessage(&Message); //消息循环. DispatchMessage(&Message); } return Message.wParam; } long WINAPI WndProc(HWND hWnd, UINT iMessage, UINT wParam, LONG lParam) //消息处理函数. { HDC hDC; //定义设备环境句柄. HBRUSH hBrush; //定义画刷句柄 HPEN hPen; //定义画笔句柄 PAINTSTRUCT PtStr; //定义包含绘图信息的结构体变量 int nCentreX,nCentreY; //定义3个叶片的圆心的坐标. double fAngle; switch(iMessage) { case WM_PAINT: //处理绘图消息. hDC=BeginPaint(hWnd,&PtStr); //获得设备环境指针. SetMapMode(hDC,MM_ANISOTROPIC); //设置映射模式. SetWindowOrgEx(hDC,-200,-200,NULL); // SetWindowOrgEx(hDC,400,300,NULL); //SetWindowExtEx(hDC,400,300,NULL); //设置窗口区域.逻辑单位. //SetViewportExtEx(hDC,600,450,NULL); //设置视口区域.物理单位. SetViewportOrgEx(hDC,300,200,NULL); //设置视口原点坐标为(300,200).物理单位. //绘制外圆。 hPen = (HPEN)GetStockObject(BLACK_PEN); SelectObject(hDC,hPen); Ellipse(hDC,-100,-100,100,100); //绘制风车的叶片。 hBrush = CreateSolidBrush(RGB(255,0,0)); //画红色的叶片. SelectObject(hDC,hBrush); fAngle = 2*Pi/nMaxNum*nNum; nCentreX =(int)(50*cos(fAngle)); nCentreY = (int)(50*sin(fAngle)); Pie(hDC,nCentreX-50,nCentreY-50, nCentreX+50,nCentreY+50, (int)(nCentreX+50*cos(fAngle)),(int)(nCentreY+50*sin(fAngle)), (int)(nCentreX+50*cos(fAngle+Pi)),(int)(nCentreY+50*sin(fAngle+Pi))); hBrush = CreateSolidBrush(RGB(255,255,0)); //画天蓝色的叶片. SelectObject(hDC,hBrush); nCentreX = (int)(50*cos(fAngle+2*Pi/3)); nCentreY = (int)(50*sin(fAngle+2*Pi/3)); Pie(hDC,nCentreX-50,nCentreY-50, nCentreX+50,nCentreY+50, (int)(nCentreX+50*cos(fAngle+2*Pi/3)),(int)(nCentreY+50*sin(fAngle+2*Pi/3)), (int)(nCentreX+50*cos(fAngle+Pi+2*Pi/3)),(int)(nCentreY+50*sin(fAngle+Pi+2*Pi/3))); hBrush = CreateSolidBrush(RGB(0,255,255)); //画黄色的叶片. SelectObject(hDC,hBrush); nCentreX = (int)(50*cos(fAngle+4*Pi/3)); nCentreY = (int)(50*sin(fAngle+4*Pi/3)); Pie(hDC,nCentreX-50,nCentreY-50, nCentreX+50,nCentreY+50, (int)(nCentreX+50*cos(fAngle+4*Pi/3)),(int)(nCentreY+50*sin(fAngle+4*Pi/3)), (int)(nCentreX+50*cos(fAngle+Pi+4*Pi/3)),(int)(nCentreY+50*sin(fAngle+Pi+4*Pi/3))); nNum++; //当前序数加1. Sleep(100); //等待0.1秒. InvalidateRect(hWnd,NULL,1); //重绘窗口区域. EndPaint(hWnd,&PtStr); //释放环境指针。 return 0; case WM_DESTROY: //关闭窗口. PostQuitMessage(0); return 0; default: return(DefWindowProc(hWnd,iMessage,wParam,lParam)); } }