incubator-nuttx/libnx/nxglib/nxglib_rectoverlap.c

/****************************************************************************
 * libnx/nxglib/nxglib_nulloverlap.c
 *
 *   Copyright (C) 2008-2011, 2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdbool.h>

#include <nuttx/nx/nxglib.h>

/****************************************************************************
 * Pre-Processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: nxgl_rectoverlap
 *
 * Description:
 *   Return true if the two rectangles overlap
 *
 ****************************************************************************/

bool nxgl_rectoverlap(FAR struct nxgl_rect_s *rect1,
                      FAR struct nxgl_rect_s *rect2)
{
  /* The neither is wholly above, below, right, or left of the other, then
   * the two rectangles overlap in some fashion.
   */

  return (rect1->pt1.x <= rect2->pt2.x) &&  /* false: rect1 is wholly to the right */
         (rect2->pt1.x <= rect1->pt2.x) &&  /* false: rect2 is wholly to the right */
         (rect1->pt1.y <= rect2->pt2.y) &&  /* false: rect1 is wholly below rect2 */
         (rect2->pt1.y <= rect1->pt2.y);    /* false: rect2 is wholly below rect1 */
}