C언어는 무한한 언어입니다. 잘 배우시면 좋습니다.
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#include <windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
LPSTR lpszClass="Mouse";
int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance
,LPSTR lpszCmdParam,int nCmdShow)
{
HWND hWnd;
MSG Message;
WNDCLASS WndClass;
g_hInst=hInstance;
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)WndProc;
WndClass.lpszClassName=lpszClass;
WndClass.lpszMenuName=NULL;
WndClass.style=CS_HREDRAW | CS_VREDRAW;
RegisterClass(&WndClass);
hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
NULL,(HMENU)NULL,hInstance,NULL);
ShowWindow(hWnd,nCmdShow);
while(GetMessage(&Message,0,0,0)) {
TranslateMessage(&Message);
DispatchMessage(&Message);
}
return Message.wParam;
}
LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
static int x;
static int y;
static BOOL bnowDraw=FALSE;
switch(iMessage) {
case WM_LBUTTONDOWN:
x=LOWORD(lParam);
y=HIWORD(lParam);
bnowDraw=TRUE;
return 0;
case WM_MOUSEMOVE:
if (bnowDraw==TRUE) {
hdc=GetDC(hWnd);
MoveToEx(hdc,x,y,NULL);
x=LOWORD(lParam);
y=HIWORD(lParam);
LineTo(hdc,x+1,y+2);
LineTo(hdc,x+2,y+3);
LineTo(hdc,x-1,y-2);
LineTo(hdc,x-2,y-3);
LineTo(hdc,y+1,x+2);
LineTo(hdc,y+2,x+3);
LineTo(hdc,y-1,x-2);
LineTo(hdc,y-2,x-3);
LineTo(hdc,x+2,y+1);
LineTo(hdc,x+3,y+2);
LineTo(hdc,x-2,y-1);
LineTo(hdc,x-3,y-2);
LineTo(hdc,y+2,x+1);
LineTo(hdc,y+3,x+2);
LineTo(hdc,y-2,x-1);
LineTo(hdc,y-3,x-2);
ReleaseDC(hWnd,hdc);
}
return 0;
case WM_LBUTTONUP:
bnowDraw=FALSE;
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}
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상당히 API 중 쉬운 부분만 다루었고 메시지 부분도 쉬운 메시지만
처리하였습니다. 얼마든지 수정해서 알아보세요. 여기서 그래픽에 관련된 소스는
if (bnowDraw==TRUE) {
hdc=GetDC(hWnd);
MoveToEx(hdc,x,y,NULL);
x=LOWORD(lParam);
y=HIWORD(lParam);
LineTo(hdc,x+1,y+2);
LineTo(hdc,x+2,y+3);
LineTo(hdc,x-1,y-2);
LineTo(hdc,x-2,y-3);
LineTo(hdc,y+1,x+2);
LineTo(hdc,y+2,x+3);
LineTo(hdc,y-1,x-2);
LineTo(hdc,y-2,x-3);
LineTo(hdc,x+2,y+1);
LineTo(hdc,x+3,y+2);
LineTo(hdc,x-2,y-1);
LineTo(hdc,x-3,y-2);
LineTo(hdc,y+2,x+1);
LineTo(hdc,y+3,x+2);
LineTo(hdc,y-2,x-1);
LineTo(hdc,y-3,x-2);
ReleaseDC(hWnd,hdc);
}
return 0;
이것이니까 여기를 잘 고쳐보세요. 숫자만 고치거나 변수를 따로 만들어도
괜찮습니다.
그림 :
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1581, 
79/80 
