プログラマ専用SNS ミクプラ

コード:

switch(uMsg) {
		case WM_CREATE: //ウィンドウが作られたら
			hdc = GetDC(hWnd);
			hMemDC = CreateCompatibleDC(hdc);
			hBitmap = CreateCompatibleBitmap(hdc, CANVAS_WINDOW_WIDTH, CANVAS_WINDOW_HEIGHT);
			ReleaseDC(hWnd, hdc);

			SelectObject(hMemDC, hBitmap);
			SelectObject(hMemDC, GetStockObject(BLACK_PEN));
			SelectObject(hMemDC, GetStockObject(WHITE_BRUSH));
			Rectangle(hMemDC, -1, -1, CANVAS_WINDOW_WIDTH, CANVAS_WINDOW_HEIGHT);

			SelectObject(hMemDC, GetStockObject(BLACK_BRUSH));

			return 0L;

		case WM_MOUSEMOVE:
			if(wParam == MK_LBUTTON) {
				int x = LOWORD(lParam), y = HIWORD(lParam);
				Ellipse(hMemDC, x-2, y-2, x+2, y+2);
				InvalidateRect(hWnd, NULL, FALSE);
			}
			return 0L;

		case WM_PAINT:
			hdc = BeginPaint(hWnd, &ps);
			BitBlt(hdc, 0, 0, CANVAS_WINDOW_WIDTH, CANVAS_WINDOW_HEIGHT, hMemDC, 0, 0, SRCCOPY);
			EndPaint(hWnd, &ps);
			return 0L;	
	}