#include <windows.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevinst,

PSTR lpszCmdLine, int nCmdShow)

{
HWND hwnd ;

MSG Msg ;
WNDCLASS wndclass ;
char lpszTitle[]="My_Map_Mode";
char lpszClassName[]="影响模式";

wndclass.style = 0 ;

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= lpszClassName ;

if (!RegisterClass (&wndclass))

{

MessageBeep(0);

return FALSE;

}

hwnd = CreateWindow( lpszClassName, // window class name

lpszTitle, // window caption

WS_OVERLAPPEDWINDOW, // window style

CW_USEDEFAULT,// initial x position

CW_USEDEFAULT,// initial y position

CW_USEDEFAULT,// initial x size

CW_USEDEFAULT,// initial y size

NULL, // parent window handle

NULL, // window menu handle

hInstance, // program instance handle

NULL) ; // creation parameters

ShowWindow (hwnd, nCmdShow) ;

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 ;

HBRUSH hB1,hB2;
int nMode;

switch (message)

{

case WM_CREATE:

nMode=MM_TEXT;

case WM_LBUTTONDOWN:
nMode=MM_ISOTROPIC;
InvalidateRect(hwnd,NULL,1);
break;
case WM_RBUTTONDOWN:
nMode=MM_ANISOTROPIC;
InvalidateRect(hwnd,NULL,1);
break;

case WM_PAINT:

hdc = BeginPaint (hwnd, &ps) ;

SetMapMode(hdc,nMode);
SetWindowExtEx(hdc,150,150,NULL);//就是这2句，感觉和没用一样，学了几天
SetViewportExtEx(hdc,150,100,NULL);//的印象模式，还是不明白它们有什么作用
//把它们的参数全写成0，也没有什么变化，哪位好人给说几句把，
//它们有什么用啊，
SetViewportOrgEx(hdc,100,10,NULL);
hB1=(HBRUSH)GetStockObject(WHITE_BRUSH);
hB2=(HBRUSH)GetStockObject(BLACK_BRUSH);
SelectObject(hdc,hB1);
RoundRect(hdc,0,0,150,150,30,30);
SelectObject(hdc,hB2);
Ellipse(hdc,0,10,150,140);

EndPaint (hwnd, &ps) ;

break ;

case WM_DESTROY:
DeleteObject(hB1);
DeleteObject(hB2);
PostQuitMessage (0) ;
break;
default:

return DefWindowProc (hwnd, message, wParam, lParam) ;

}

return 0 ;
}