//

//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)

//

//  PURPOSE:  Processes messages for the main window.

//

//  WM_COMMAND	- process the application menu

//  WM_PAINT	- Paint the main window

//  WM_DESTROY	- post a quit message and return

//

//

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

	static int cxClient,cyClient;

	int wmId, wmEvent;

	PAINTSTRUCT ps;

	HDC hdc;

	switch (message)

	{

	case WM_SIZE:

		cxClient = LOWORD(lParam);

		cyClient = HIWORD(lParam);

		return 0;

	case WM_COMMAND:

		wmId    = LOWORD(wParam);

		wmEvent = HIWORD(wParam);

		// Parse the menu selections:

		switch (wmId)

		{

		case IDM_ABOUT:

			DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);

			break;

		case IDM_EXIT:

			DestroyWindow(hWnd);

			break;

		default:

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

		}

		break;

	case WM_PAINT:

		hdc = BeginPaint(hWnd, &ps);

		// TODO: Add any drawing code here...

		/*

		//SetMapMode(hdc,MM_ISOTROPIC);

		SetMapMode(hdc,MM_ANISOTROPIC);		//会拉伸

		SetWindowExtEx(hdc, 32767,32767,NULL);

		SetViewportExtEx(hdc,cxClient,-cyClient,NULL);

		SetViewportOrgEx(hdc,0,cyClient,NULL);

		//MoveToEx(hdc,0,0,NULL);

		LineTo(hdc,32767,32767);

		*/

		SetMapMode(hdc,MM_ISOTROPIC);

		SetWindowExtEx(hdc,1000,1000,NULL);

		SetViewportExtEx(hdc,cxClient/2,-cyClient/2,NULL);

		//(xWinOrg,yWinOrg),(xViewOrg,yViewOrg) 均默认为(0,0)

		//SetWindowOrgEx(hdc,cxClient/2,cyClient/2,NULL);

		SetViewportOrgEx(hdc,cxClient/2,cyClient/2,NULL);

		Rectangle(hdc,-200,-200,200,200);

		MoveToEx(hdc,-200,-200,NULL);

		LineTo(hdc,200,200);

		//Window偏移

		SetWindowOrgEx(hdc,-50,-50,NULL);

		Rectangle(hdc,-200,-200,200,200);

		EndPaint(hWnd, &ps);

		break;

	case WM_DESTROY:

		PostQuitMessage(0);

		break;

	default:

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

	}

	return 0;

}