5인용C++스터디/윈도우에그림그리기

GDI ¶

GDI(Graphics Device Interface)�� 클��트 �� 하�� 함��. �� 픽 �� . �� Windows�� 하�� GDI�� 하�� 할 �� Windows �� GDI�� 하�� , ��크�� , ��, �� 페�� 템�� 행한��.

DC ¶

DC(Device Context)�� GDI�� 해 �� ��픽 �� 하�� 해�� 한 ����. �� 할 �� DC�� 한 핸�� 한��. �� 핸�� Windows�� 할 �� 허��해 ��. �� 핸�� GDI 함�� 하�� 하�� Windows�� 할 �� 한��.

핸�� : �� 핸�� 핸��.

�� 할�� 핸�� /�� 하�� �� 핸�� 하�� 한 ����.

DC 핸�� ¶

DC 핸�� 해��하�� WM_PAINT �� BeginPaint�� EndPaint 호�� 하�� .

hdc = BeginPaint (hwnd, &ps);
��
EndPaint (hwnd, &ps);

�� 한 핸��.
�� ps�� PAINTSTRUCT 형�� . PAINTSTRUCT �� 클��트 �� 할 �� .

WM_PAINT ¶

��통 �� WinMain�� UpdateWindow�� 호��할 �� 한��. �� 하�� 클��트 �� 한��.

WM_PAINT �� 항�� BeginPaint�� 한 호�� .

hdc = BeginPaint (hwnd, &ps);

�� EndPaint�� 호��하�� .

EndPaint (hwnd, &ps);

�� 한 핸��. �� PAINTSTRUCT 형�� 한 포��. PAINTSTRUCT �� 클��트 �� 할 �� .

WndProc�� BeginPaint�� 호��하�� GetClientRect�� 호��한��.

GetClientRect(hwnd, &rect);

�� 한 핸��. �� RECT형�� 형 �� 한 포��.

�� ¶

~cpp 
#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmdLine, int nCmdShow)
{
	HWND hWnd;
	WNDCLASS wc;
	MSG mSg;
	char szTitleName[]="Drawing Line";
	char szClassName[]="it is a class";

	wc.cbClsExtra=NULL;
	wc.cbWndExtra=NULL;
	wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
	wc.hCursor=LoadCursor(NULL,IDC_ARROW);
	wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
	wc.hInstance=hInst;
	wc.lpfnWndProc=WndProc;
	wc.lpszClassName=szClassName;
	wc.lpszMenuName=NULL;
	wc.style=NULL;

	RegisterClass(&wc);

	hWnd=CreateWindow(szClassName,szTitleName, WS_OVERLAPPEDWINDOW,100,90,320,240,NULL,NULL,hInst,NULL);

	ShowWindow(hWnd,nCmdShow);
	UpdateWindow(hWnd);

	while(GetMessage(&mSg,NULL,0,0))
	{
		TranslateMessage(&mSg);
		DispatchMessage(&mSg);
	}
	return mSg.wParam;
}

LRESULT CALLBACK WndProc(
						 HWND hWnd,
						 UINT uMsg,
						 WPARAM wParam,
						 LPARAM lParam)
{
	HDC hDC;
	HPEN hPen;
	PAINTSTRUCT ps;
	static int nSX,nSY,nEX,nEY;
	static POINT pt;
	static BOOL bTF;

	switch(uMsg)
	{
	case WM_LBUTTONDOWN:
		{
			bTF = TRUE;
			nSX=LOWORD(lParam);
			nSY=HIWORD(lParam);
		}
		return FALSE;

	case WM_LBUTTONUP:
		{
			bTF=FALSE;
			nEX=LOWORD(lParam);
			nEY=HIWORD(lParam);
			InvalidateRect(hWnd,NULL,FALSE);
		}
		return FALSE;

	case WM_PAINT:
		{
			if(bTF==FALSE)
			{
				hPen=CreatePen(PS_SOLID,0,RGB(0,0,0));
				hDC=BeginPaint(hWnd,&ps);
				SelectObject(hDC,hPen);
                                    SelectObject(hDC, GetStockObject(NULL_BRUSH));
 				MoveToEx(hDC,nSX,nSY,&pt);
				LineTo(hDC,nEX,nEY);
				DeleteObject(hPen);
				EndPaint(hWnd,&ps);
			}
		}
			return FALSE;
	case WM_DESTROY:
		PostQuitMessage(0);
		return FALSE;
		}
		return DefWindowProc(hWnd,uMsg,wParam,lParam);
	}

~cpp 
                               hPen=CreatePen(PS_SOLID,0,RGB(0,0,0)); 
                               hDC=BeginPaint(hWnd,&ps); 
                               Ellipse(hDC,nSX,nSY,nEX,nEY);
                               EndPaint(hWnd,&ps);

CreatePen() : 펜�� 하�� 함��.
SelectObject() : CreatePen()�� 펜�� 하�� 해��.
LineTO() : �� 할.
DeleteObject() : CreatePen()함�� 한 펜�� 할.

5��C++��