257 lines
8.5 KiB
C
257 lines
8.5 KiB
C
/****************************************************************************
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* examples/pwlines/pwlines_update.c
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*
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* Copyright (C) 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <debug.h>
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#include <fixedmath.h>
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#include <nuttx/nx/nx.h>
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#include <nuttx/nx/nxglib.h>
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#include "pwlines_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifdef CONFIG_NX_ANTIALIASING
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/* If anti-aliasing is enabled, then we must clear a slightly
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* larger region to prevent weird edge effects.
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*/
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# define CLEAR_WIDTH (CONFIG_EXAMPLES_PWLINES_LINEWIDTH + 2)
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#else
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# define CLEAR_WIDTH CONFIG_EXAMPLES_PWLINES_LINEWIDTH
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#endif
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#ifndef MIN
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# define MIN(a,b) (a < b ? a : b)
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pwlines_circle
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*
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* Description:
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* Draw a circle in each window.
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*
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****************************************************************************/
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void pwlines_circle(FAR struct pwlines_state_s *st)
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{
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FAR struct pwlines_window_s *wndo;
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nxgl_coord_t maxradius;
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nxgl_coord_t radius;
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int wndx;
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int ret;
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for (wndx = 0; wndx < 3; wndx++)
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{
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wndo = &st->wndo[wndx];
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/* Get the maximum radius and center of the circle */
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maxradius = MIN(wndo->size.h, wndo->size.h) >> 1;
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wndo->center.x = wndo->size.w >> 1;
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wndo->center.y = wndo->size.h >> 1;
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/* Draw a circular background */
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radius = maxradius - ((CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 1) / 2);
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ret = nxtk_fillcirclewindow(wndo->hwnd, &wndo->center, radius,
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st->facecolor);
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if (ret < 0)
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{
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printf("pwlines_update: ERROR: nxtk_fillcirclewindow failed: %d\n",
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ret);
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}
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/* Draw the circular border */
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ret = nxtk_drawcirclewindow(wndo->hwnd, &wndo->center, radius,
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CONFIG_EXAMPLES_PWLINES_BORDERWIDTH,
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st->bordercolor);
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if (ret < 0)
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{
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printf("pwlines_update: ERROR: nxtk_drawcirclewindow failed: %d\n",
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ret);
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}
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/* Back off the radius to account for the thickness of border line
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* and with a big fudge factor that will (hopefully) prevent the corners
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* of the lines from overwriting the border. This is overly complicated
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* here because we don't assume anything about the screen resolution or
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* the borderwidth or the line thickness (and there are certainly some
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* smarter ways to do this).
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*/
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if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 80))
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{
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wndo->radius = maxradius - (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 40);
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}
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else if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 60))
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{
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wndo->radius = maxradius - (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 30);
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}
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else if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 40))
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{
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wndo->radius = maxradius - (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 20);
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}
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else if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 20))
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{
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wndo->radius = maxradius - (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 10);
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}
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else if (maxradius > (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 10))
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{
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wndo->radius = maxradius - (CONFIG_EXAMPLES_PWLINES_BORDERWIDTH + 5);
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}
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else
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{
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wndo->radius = maxradius - CONFIG_EXAMPLES_PWLINES_BORDERWIDTH;
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}
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wndo->angle = 0;
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wndo->previous.pt1.x = wndo->center.x;
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wndo->previous.pt1.y = wndo->center.y;
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wndo->previous.pt2.x = wndo->center.x;
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wndo->previous.pt2.y = wndo->center.y;
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}
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}
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/****************************************************************************
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* Name: pwlines_update
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*
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* Description:
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* Update line motion.
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*
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****************************************************************************/
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void pwlines_update(FAR struct pwlines_state_s *st)
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{
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FAR struct pwlines_window_s *wndo;
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struct nxgl_vector_s vector;
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nxgl_coord_t halfx;
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nxgl_coord_t halfy;
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b16_t sinangle;
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b16_t cosangle;
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int wndx;
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int ret;
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/* Update each window */
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for (wndx = 0; wndx < 3; wndx++)
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{
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wndo = &st->wndo[wndx];
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/* Determine the position of the line on this pass */
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sinangle = b16sin(wndo->angle);
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halfx = b16toi(b16muli(sinangle, wndo->radius));
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cosangle = b16cos(wndo->angle);
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halfy = b16toi(b16muli(cosangle, wndo->radius));
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vector.pt1.x = wndo->center.x + halfx;
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vector.pt1.y = wndo->center.y + halfy;
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vector.pt2.x = wndo->center.x - halfx;
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vector.pt2.y = wndo->center.y - halfy;
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printf("Angle: %08x vector: (%d,%d)->(%d,%d)\n",
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wndo->angle, vector.pt1.x, vector.pt1.y, vector.pt2.x, vector.pt2.y);
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/* Clear the previous line by overwriting it with the circle face color */
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ret = nx_drawline(wndo->hwnd, &wndo->previous, CLEAR_WIDTH, st->facecolor,
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NX_LINECAP_NONE);
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if (ret < 0)
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{
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printf("pwlines_update: nx_drawline failed clearing: %d\n", ret);
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}
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/* Draw the new line */
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ret = nx_drawline(wndo->hwnd, &vector,
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CONFIG_EXAMPLES_PWLINES_LINEWIDTH, st->linecolor,
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NX_LINECAP_NONE);
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if (ret < 0)
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{
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printf("pwlines_update: nx_drawline failed clearing: %d\n", ret);
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}
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#ifdef CONFIG_NX_ANTIALIASING
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/* If anti-aliasing is enabled, then we must clear a slightly
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* larger region to prevent weird edge effects.
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*/
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halfx = b16toi(b16muli(sinangle, wndo->radius + 1));
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halfy = b16toi(b16muli(cosangle, wndo->radius + 1));
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wndo->previous.pt1.x = wndo->center.x + halfx;
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wndo->previous.pt1.y = wndo->center.y + halfy;
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wndo->previous.pt2.x = wndo->center.x - halfx;
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wndo->previous.pt2.y = wndo->center.y - halfy;
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#else
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memcpy(&wndo->previous, &vector, sizeof(struct nxgl_vector_s));
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#endif
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/* Set up for the next time through the loop. */
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wndo->angle += b16PI / 16; /* 32 angular positions in full circle */
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/* Check if we have gone all the way around */
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if (wndo->angle > (31 * (2 * b16PI) / 32))
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{
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/* Wrap back to zero and continue with the test */
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wndo->angle = 0;
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}
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}
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}
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