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nuttx-apps/examples/pwlines/pwlines_update.c

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/****************************************************************************
* examples/pwlines/pwlines_update.c
*
* Copyright (C) 2019 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
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <unistd.h>
#include <string.h>
#include <debug.h>
#include <fixedmath.h>
#include <nuttx/nx/nx.h>
#include <nuttx/nx/nxglib.h>
#include "pwlines_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_NX_ANTIALIASING
/* If anti-aliasing is enabled, then we must clear a slightly
* larger region to prevent weird edge effects.
*/
# define CLEAR_WIDTH (CONFIG_EXAMPLES_PWLINES_LINEWIDTH + 2)
#else
# define CLEAR_WIDTH CONFIG_EXAMPLES_PWLINES_LINEWIDTH
#endif
#ifndef MIN
# define MIN(a,b) (a < b ? a : b)
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pwlines_circle
*
* Description:
* Draw a circle in each window.
*
****************************************************************************/
void pwlines_circle(FAR struct pwlines_state_s *st)
{
FAR struct pwlines_window_s *wndo;
nxgl_coord_t maxradius;
nxgl_coord_t radius;
int wndx;
int ret;
for (wndx = 0; wndx < 3; wndx++)
{
wndo = &st->wndo[wndx];
/* Get the maximum radius and center of the circle */
maxradius = MIN(wndo->size.h, wndo->size.h) >> 1;
wndo->center.x = wndo->size.w >> 1;
wndo->center.y = wndo->size.h >> 1;
/* Draw a circular background */
radius = maxradius - ((CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 1) / 2);
ret = nxtk_fillcirclewindow(wndo->hwnd, &wndo->center, radius,
st->facecolor);
if (ret < 0)
{
printf("pwlines_update: ERROR: nxtk_fillcirclewindow failed: %d\n",
ret);
}
/* Draw the circular border */
ret = nxtk_drawcirclewindow(wndo->hwnd, &wndo->center, radius,
CONFIG_EXAMPLES_PWLINES_BORDERWIDTH,
st->bordercolor);
if (ret < 0)
{
printf("pwlines_update: ERROR: nxtk_drawcirclewindow failed: %d\n",
ret);
}
/* Back off the radius to account for the thickness of border line
* and with a big fudge factor that will (hopefully) prevent the
* corners of the lines from overwriting the border. This is overly
* complicated here because we don't assume anything about the screen
* resolution or the borderwidth or the line thickness (and there are
* certainly some smarter ways to do this).
*/
if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 80))
{
wndo->radius = maxradius -
(CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 40);
}
else if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 60))
{
wndo->radius = maxradius -
(CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 30);
}
else if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 40))
{
wndo->radius = maxradius -
(CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 20);
}
else if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 20))
{
wndo->radius = maxradius -
(CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 10);
}
else if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 10))
{
wndo->radius = maxradius -
(CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 5);
}
else
{
wndo->radius = maxradius - CONFIG_EXAMPLES_PWLINES_BORDERWIDTH;
}
wndo->angle = 0;
wndo->previous.pt1.x = wndo->center.x;
wndo->previous.pt1.y = wndo->center.y;
wndo->previous.pt2.x = wndo->center.x;
wndo->previous.pt2.y = wndo->center.y;
}
}
/****************************************************************************
* Name: pwlines_update
*
* Description:
* Update line motion.
*
****************************************************************************/
void pwlines_update(FAR struct pwlines_state_s *st)
{
FAR struct pwlines_window_s *wndo;
struct nxgl_vector_s vector;
nxgl_coord_t halfx;
nxgl_coord_t halfy;
b16_t sinangle;
b16_t cosangle;
int wndx;
int ret;
/* Update each window */
for (wndx = 0; wndx < 3; wndx++)
{
wndo = &st->wndo[wndx];
/* Determine the position of the line on this pass */
sinangle = b16sin(wndo->angle);
halfx = b16toi(b16muli(sinangle, wndo->radius));
cosangle = b16cos(wndo->angle);
halfy = b16toi(b16muli(cosangle, wndo->radius));
vector.pt1.x = wndo->center.x + halfx;
vector.pt1.y = wndo->center.y + halfy;
vector.pt2.x = wndo->center.x - halfx;
vector.pt2.y = wndo->center.y - halfy;
printf("Angle: %08" PRIx32 " vector: (%d,%d)->(%d,%d)\n",
(uint32_t)wndo->angle, vector.pt1.x, vector.pt1.y,
vector.pt2.x, vector.pt2.y);
/* Clear the previous line by overwriting it with the circle face
* color
*/
ret = nx_drawline(wndo->hwnd, &wndo->previous, CLEAR_WIDTH,
st->facecolor, NX_LINECAP_NONE);
if (ret < 0)
{
printf("pwlines_update: nx_drawline failed clearing: %d\n", ret);
}
/* Draw the new line */
ret = nx_drawline(wndo->hwnd, &vector,
CONFIG_EXAMPLES_PWLINES_LINEWIDTH, st->linecolor,
NX_LINECAP_NONE);
if (ret < 0)
{
printf("pwlines_update: nx_drawline failed clearing: %d\n", ret);
}
#ifdef CONFIG_NX_ANTIALIASING
/* If anti-aliasing is enabled, then we must clear a slightly
* larger region to prevent weird edge effects.
*/
halfx = b16toi(b16muli(sinangle, wndo->radius + 1));
halfy = b16toi(b16muli(cosangle, wndo->radius + 1));
wndo->previous.pt1.x = wndo->center.x + halfx;
wndo->previous.pt1.y = wndo->center.y + halfy;
wndo->previous.pt2.x = wndo->center.x - halfx;
wndo->previous.pt2.y = wndo->center.y - halfy;
#else
memcpy(&wndo->previous, &vector, sizeof(struct nxgl_vector_s));
#endif
/* Set up for the next time through the loop. */
wndo->angle += b16PI / 16; /* 32 angular positions in full circle */
/* Check if we have gone all the way around */
if (wndo->angle > (31 * (2 * b16PI) / 32))
{
/* Wrap back to zero and continue with the test */
wndo->angle = 0;
}
}
}
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