#include <windows.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow){	static TCHAR szAppName[] = TEXT ("坐标") ;    HWND hwnd ;    MSG msg ;    WNDCLASS wndclass ;    wndclass.style = CS_HREDRAW | CS_VREDRAW;    wndclass.lpfnWndProc= WndProc ;    wndclass.cbClsExtra = 0 ;    wndclass.cbWndExtra = 0 ;    wndclass.hInstance = hInstance ;    wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;    wndclass.hCursor= LoadCursor (NULL, IDC_ARROW) ;    wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;    wndclass.lpszMenuName = NULL ;    wndclass.lpszClassName = szAppName ;    if (!RegisterClass (&wndclass))	{        MessageBox (NULL, TEXT ("This program requires Windows NT!"),        szAppName, MB_ICONERROR) ;        return 0 ;	}    hwnd = CreateWindow (szAppName, TEXT ("坐标尺寸"),                         WS_OVERLAPPEDWINDOW,                         CW_USEDEFAULT, CW_USEDEFAULT,                         CW_USEDEFAULT, CW_USEDEFAULT,                         NULL, NULL, hInstance, NULL) ;    ShowWindow (hwnd, iCmdShow) ;    UpdateWindow (hwnd) ;    while (GetMessage (&msg, NULL, 0, 0))	{        TranslateMessage (&msg) ;        DispatchMessage (&msg) ;	}    return msg.wParam ;}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){	HDC hdc ;    PAINTSTRUCT ps ;	RECT rect;	switch (message)	{     case WM_PAINT:		 hdc = BeginPaint (hwnd, &ps) ;		HPEN hPen,hOldPen;		 hPen=CreatePen(PS_SOLID,1,RGB(0,12,255));		 hOldPen=(HPEN)SelectObject(hdc,hPen);//1	     Ellipse(hdc,-100, -100, 100, 100);		 GetClientRect(hwnd,&rect);     //    MoveToEx(hdc,rect.right/2,0,NULL);	//	 LineTo(hdc,rect.right/2,rect.bottom);//		 MoveToEx(hdc,rect.left,rect.bottom/2,NULL);//		 LineTo(hdc,rect.right,rect.bottom/2);//2		 Ellipse(hdc,-50,-50,50,50);//		 MoveToEx(hdc,0,0,NULL);//		 LineTo(hdc,100,100);//3		 SetViewportOrgEx(hdc,200,150,NULL);//		 Ellipse(hdc,-50,-50,50,50);//		 MoveToEx(hdc,0,0,NULL);//		 LineTo(hdc,100,100);//3.1 SetViewportOrgEx(hdc,rect.right/2,rect.bottom/2,NULL);//		 Ellipse(hdc,-50,-50,50,50);//		 MoveToEx(hdc,0,0,NULL);//		 LineTo(hdc,100,100);//3.2		SetViewportOrgEx(hdc,rect.right/2,rect.bottom/2,NULL);//		Ellipse(hdc,-100,-100,100,100);//		MoveToEx(hdc,rect.left,0,NULL);//		LineTo(hdc,rect.right,0);	//	MoveToEx(hdc,0,rect.top,NULL);	//	LineTo(hdc,0,rect.bottom);//4		 SetMapMode(hdc,MM_ANISOTROPIC);//		SetViewportOrgEx(hdc,380,220,NULL);//		Ellipse(hdc,-100,-100,100,100);//		MoveToEx(hdc,-380,0,NULL);//		LineTo(hdc,380,0);//		MoveToEx(hdc,0,-220,NULL);//		LineTo(hdc,0,220);//		MoveToEx(hdc,0,0,NULL);//		LineTo(hdc,120,120);		 LOGBRUSH logbrush;		 HBRUSH hBrush,hOldBrush;		 logbrush.lbStyle=BS_SOLID;		 logbrush.lbColor=RGB(128,128,128);		 logbrush.lbHatch=HS_HORIZONTAL;		 hBrush=CreateBrushIndirect(&logbrush);		 hOldBrush=(HBRUSH)SelectObject(hdc,hBrush);		 Rectangle(hdc,-100,-100,100,100);		 MoveToEx(hdc,0,0,NULL);		 LineTo(hdc,200,200);		 DeleteObject(hPen);		 DeleteObject(hBrush);		 SelectObject(hdc,hOldPen);		 SelectObject(hdc,hOldBrush);        EndPaint (hwnd, &ps) ;        break;     case WM_DESTROY:        PostQuitMessage (0) ;        return 0 ;	}     return DefWindowProc (hwnd, message, wParam, lParam) ;}