examples/pwlines/pwlines_motion.c

/****************************************************************************
 * apps/examples/pwlines/pwlines_motion.c
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

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

#include <nuttx/config.h>

#include <stdio.h>
#include <stdbool.h>
#include <errno.h>

#include <nuttx/nx/nxglib.h>
#include <nuttx/nx/nxtk.h>

#include "pwlines_internal.h"

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

/****************************************************************************
 * Name: pwlines_move_window
 ****************************************************************************/

static inline bool pwlines_move_window(FAR struct pwlines_state_s *st, int wndx)
{
  FAR struct pwlines_window_s *wndo = &st->wndo[wndx];
  FAR struct nxgl_point_s pos;
  b16_t newx;
  b16_t newy;
  bool hit = false;
  int ret;

#ifdef CONFIG_EXAMPLES_PWLINES_VERBOSE
  printf("pwlines_move_window: Velocity: (%lx.%04lx,%lx.%04lx)\n",
         (unsigned long)wndo->deltax >> 16,
         (unsigned long)wndo->deltax & 0xffff,
         (unsigned long)wndo->deltay >> 16,
         (unsigned long)wndo->deltay & 0xffff);
  printf("pwlines_move_window: Max: (%lx.%04lx,%lx.%04lx)\n",
         (unsigned long)wndo->xmax >> 16,
         (unsigned long)wndo->xmax & 0xffff,
         (unsigned long)wndo->ymax >> 16,
         (unsigned long)wndo->ymax & 0xffff);
#endif

  /* Update X position */

  newx             = wndo->xpos + wndo->deltax;

  /* Check for collision with left or right side */

  if (newx <= 0)
    {
      newx         = 0;
      wndo->deltax = -wndo->deltax;
      hit          = true;
    }
  else if (newx >= wndo->xmax)
    {
      newx         = wndo->xmax;
      wndo->deltax = -wndo->deltax;
      hit          = true;
    }

  /* Update Y position */

  newy             = wndo->ypos + wndo->deltay;

  /* Check for collision with top or bottom side */

  if (newy <= 0)
    {
      newy         = 0;
      wndo->deltay = -wndo->deltay;
      hit          = true;
    }
  else if (newy >= wndo->ymax)
    {
      newy         = wndo->ymax;
      wndo->deltay = -wndo->deltay;
      hit          = true;
    }

#ifdef CONFIG_EXAMPLES_PWLINES_VERBOSE
  printf("pwlines_move_window: Old pos: (%lx.%04lx,%lx.%04lx) "
         "New pos: (%lx.%04lx,%lx.%04lx)\n",
         (unsigned long)wndo->xpos >> 16,
         (unsigned long)wndo->xpos & 0xffff,
         (unsigned long)wndo->ypos >> 16,
         (unsigned long)wndo->ypos & 0xffff,
         (unsigned long)newx >> 16,
         (unsigned long)newx & 0xffff,
         (unsigned long)newy >> 16,
         (unsigned long)newy & 0xffff);
#endif

  /* Set the new window position */

  wndo->xpos       = newx;
  wndo->ypos       = newy;

  pos.x            = b16toi(newx);
  pos.y            = b16toi(newy);

  printf("pwlines_move_window: Set position (%d,%d)\n", pos.x, pos.y);

  ret              = nxtk_setposition(wndo->hwnd, &pos);
  if (ret < 0)
    {
      printf("pwlines_move_window: ERROR:"
             "nxtk_setposition failed: %d\n",
             errno);
      return false;
    }

  /* If we hit an edge, the raise the window */

  if (hit)
    {
#ifdef CONFIG_EXAMPLES_PWLINES_VERBOSE
      printf("pwlines_move_window: New velocity: (%lx.%04lx,%lx.%04lx)\n",
             (unsigned long)wndo->deltax >> 16,
             (unsigned long)wndo->deltax & 0xffff,
             (unsigned long)wndo->deltay >> 16,
             (unsigned long)wndo->deltay & 0xffff);
      printf("pwlines_move_window: Raising window\n");
#endif

      ret          = nxtk_raise(wndo->hwnd);
      if (ret < 0)
        {
          printf("pwlines_move_window: ERROR:"
                 "nxtk_raise failed: %d\n",
                 errno);
          return false;
        }
    }

  return true;
}

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

/****************************************************************************
 * Name: pwlines_motion
 ****************************************************************************/

bool pwlines_motion(FAR struct pwlines_state_s *st)
{
  int wndx;

  /* Move each window */

  for (wndx = 0; wndx < 3; wndx++)
    {
      if (!pwlines_move_window(st, wndx))
        {
          printf("pwlines_motion: ERROR:"
                 "pwlines_move_window failed for window %d\n",
                 wndx + 1);
        }
    }

  return true;
}