6_5.rar_site:www.pudn.com_鼠标 画圆

#include<windows.h> #include<stdlib.h> #include<string.h> long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam); BOOL InitWindowsClass(HINSTANCE hInstance); BOOL InitWindows(HINSTANCE hInstance,int nCmdShow); HWND hWndMain; RECT rect1;//矩形结构体,记录了图形的信息 int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow) { MSG Message; if(!InitWindowsClass(hInstance))//初始化窗口类 return FALSE; if(!InitWindows(hInstance,nCmdShow))//初始化窗口 return FALSE; 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) { HDC hDC; WORD x,y;//鼠标位置 HCURSOR hCursor; static BOOL bCircle=FALSE,bRect=FALSE;//绘制圆和矩形的标志变量 PAINTSTRUCT ps; x=LOWORD(lParam);//得到鼠标的位置 y=HIWORD(lParam); switch(iMessage) { case WM_LBUTTONDOWN://处理按下鼠标左键的消息 if(wParam&MK_CONTROL)//同时按下ctrl键 { bCircle=TRUE; bRect=FALSE; rect1.left=x; rect1.top=y; } else if(wParam&MK_SHIFT)//同时按下上档键时 { bRect=TRUE; bCircle=FALSE; rect1.left=x; rect1.top=y; } else { bRect=FALSE; bCircle=FALSE; } break; case WM_LBUTTONUP: bRect=FALSE; bCircle=FALSE; break; case WM_MOUSEMOVE://处理鼠标移动信息 rect1.right=x; rect1.bottom=y; if(bRect==TRUE||bCircle==TRUE) { InvalidateRect(hWnd,NULL,TRUE);//发出重绘消息 } break; case WM_PAINT: hDC=BeginPaint(hWnd,&ps); if(bCircle==TRUE) { Ellipse(hDC,rect1.left,rect1.top,rect1.right,rect1.bottom);//绘制圆形 } if(bRect==TRUE) { Rectangle(hDC,rect1.left,rect1.top,rect1.right,rect1.bottom);//绘制矩形 } EndPaint(hWnd,&ps); break; case WM_DESTROY: PostQuitMessage(0); return 0; default: return(DefWindowProc(hWnd,iMessage,wParam,lParam)); } return 0; } BOOL InitWindows(HINSTANCE hInstance,int nCmdShow) { HWND hWnd; hWnd=CreateWindow("6_5", "鼠标显示实例程序", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); if(!hWnd) return FALSE; hWndMain=hWnd; ShowWindow(hWnd,nCmdShow); UpdateWindow(hWnd); return TRUE; } BOOL InitWindowsClass(HINSTANCE hInstance) { 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=WndProc; wndclass.lpszClassName="6_5"; wndclass.lpszMenuName=NULL; wndclass.style=0; return RegisterClass(&wndclass);//返回窗口注册值 }