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void DrawBitmap(HDC hdc,int x,int y,HBITMAP hBit)
{
HDC MemDC;
HBITMAP OldBitmap;
int bx,by;
BITMAP bit;
MemDC=CreateCompatibleDC(hdc);
OldBitmap=(HBITMAP)SelectObject(MemDC, hBit);
GetObject(hBit,sizeof(BITMAP),&bit); //hit 에 저장된 비트맵 정보 bit복사.
bx=bit.bmWidth; //bit 에 복사시킨 비트맵의 사이즈
by=bit.bmHeight;
BitBlt(hdc,x,y,bx,by,MemDC,0,0,SRCCOPY);
SelectObject(MemDC,OldBitmap);
DeleteDC(MemDC);
}
#define R 20
int x,y;
int xi,yi;
HBITMAP hBit;
void OnTimer()
{
RECT crt;
HDC hdc,hMemDC;
HBITMAP OldBit;
HPEN hPen,OldPen;
HBRUSH hBrush,OldBrush;
int i;
//////////////////////////////// 그리기 초기 준비 작업 //////////////////////////////////////
GetClientRect(hWndMain,&crt); // ** hWndMain(메인핸들)의 작업영역(사각형) 좌표 얻어오기.
hdc=GetDC(hWndMain);
if (hBit==NULL) {
hBit=CreateCompatibleBitmap(hdc,crt.right,crt.bottom); // 비어있는 비트맵 생성 = 메모리에 흰 도화지 생성.
}
hMemDC=CreateCompatibleDC(hdc);
OldBit=(HBITMAP)SelectObject(hMemDC,hBit);
FillRect(hMemDC,&crt,GetSysColorBrush(COLOR_WINDOW)); // 0,1로 저장되는 메모리에 비트맵을 생성하면, 모두 0으로 채워진다.(검정색 화면 생성)
// FillRect 함수를 이용하여, GetSysColorBrush(COLOR_WINDOW) - 윈도우 화면 색깔로 메모리에 저장된 비트맵 화면을 다시 칠한다.
//////////////////////////////////////////////////////////////////////////////////////////////
if (x <= R || x >= crt.right-R)
{
xi*=-1;
}
if (y <= R || y >= crt.bottom-R)
{
yi*=-1;
}
x+=xi;
y+=yi;
// 격자 선 긋기
for (i=0;i<crt.right;i+=10) {
MoveToEx(hMemDC,i,0,NULL);
LineTo(hMemDC,i,crt.bottom);
}
for (i=0;i<crt.bottom;i+=10) {
MoveToEx(hMemDC,0,i,NULL);
LineTo(hMemDC,crt.right,i);
}
// 브러쉬 & 펜 생성 / 장착
hPen=CreatePen(PS_INSIDEFRAME,5,RGB(255,0,0));
OldPen=(HPEN)SelectObject(hMemDC,hPen);
hBrush=CreateSolidBrush(RGB(0,0,255));
OldBrush=(HBRUSH)SelectObject(hMemDC,hBrush);
// 지정된 브러쉬와 펜으로 할 작업.
Ellipse(hMemDC,x-R,y-R,x+R,y+R);
// 작업 종료 후 브러쉬&펜 반납 / 삭제
DeleteObject(SelectObject(hMemDC,OldPen));
DeleteObject(SelectObject(hMemDC,OldBrush));
SelectObject(hMemDC,OldBit);
DeleteDC(hMemDC);
ReleaseDC(hWndMain,hdc);
InvalidateRect(hWndMain,NULL,FALSE); // 다시 그리기.
}
LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
switch (iMessage) {
case WM_CREATE:
x=50;
y=50;
xi=4;
yi=5;
SetTimer(hWnd,1,25,NULL);
return 0;
case WM_TIMER:
OnTimer();
return 0;
case WM_PAINT:
hdc=BeginPaint(hWnd, &ps);
if (hBit) DrawBitmap(hdc,0,0,hBit);
EndPaint(hWnd, &ps);
return 0;
case WM_DESTROY:
if (hBit) {
DeleteObject(hBit);
}
PostQuitMessage(0);
KillTimer(hWnd,1);
return 0;
}
return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}
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