win32_step_6 - 8BitsCoding/RobotMentor GitHub Wiki

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• 유투브

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LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	if (uMsg == WM_DESTROY) PostQuitMessage(0);
	else if (uMsg == WM_PAINT) {
		PAINTSTRUCT ps;
		HDC h_dc = BeginPaint(hWnd, &ps);

		Rectangle(h_dc, g_rect.left, g_rect.top, g_rect.right, g_rect.bottom);

		EndPaint(hWnd, &ps);
		return 0;
	}
	else if (uMsg == WM_LBUTTONDOWN) {
		/*
		int x = GET_X_LPARAM(lParam);
		int y = GET_Y_LPARAM(lParam);
		g_prev_pos.x = GET_X_LPARAM(lParam);
		g_prev_pos.y = GET_Y_LPARAM(lParam);
		if (x >= g_rect.left && x <= g_rect.right && y >= g_rect.top && y <= g_rect.bottom) {
			g_is_clicked = 1;
		}
		*/

		// 좀 더 쉬운방법으로 구현
		g_prev_pos.x = GET_X_LPARAM(lParam);
		g_prev_pos.y = GET_Y_LPARAM(lParam);
		if (PtInRect(&g_rect, g_prev_pos)) {
			g_is_clicked = 1;
			SetCapture(hWnd);
		}
	}
	else if (uMsg == WM_LBUTTONUP) {
		g_is_clicked = 0;
		ReleaseCapture();
	}
	else if (uMsg == WM_MOUSEMOVE) {
		if (g_is_clicked == 1) {
			int x = GET_X_LPARAM(lParam);
			int y = GET_Y_LPARAM(lParam);

			/*
			int h_interval = x - g_prev_pos.x;
			int v_interval = y - g_prev_pos.y;

			g_rect.left += h_interval;
			g_rect.top += v_interval;
			g_rect.right += h_interval;
			g_rect.bottom += v_interval;
			*/

			// 코드를 좀 더 간단히
			OffsetRect(&g_rect, x - g_prev_pos.x, y - g_prev_pos.y);

			g_prev_pos.x = x;
			g_prev_pos.y = y;

			InvalidateRect(hWnd, NULL, TRUE);
		}
	}

	return DefWindowProc(hWnd, uMsg, wParam, lParam);
}