examples/nxdemo/nxdemo_bkgd.c - nuttx-apps - Git at Google

 /****************************************************************************
  * apps/examples/nxdemo/nxdemo_bkgd.c
  *
  * 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 <stdint.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <semaphore.h>
 #include <sys/param.h>
 #include <errno.h>
 #include <debug.h>
 #include <unistd.h>

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

 #include "nxdemo.h"
 #include "images.h"

 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/

 /* Select renderer -- Some additional logic would be required to support
  * pixel depths that are not directly addressable (1,2,4, and 24).
  */

 #if CONFIG_EXAMPLES_NXDEMO_BPP == 1
 #  define RENDERER nxf_convert_1bpp
 #elif CONFIG_EXAMPLES_NXDEMO_BPP == 2
 #  define RENDERER nxf_convert_2bpp
 #elif CONFIG_EXAMPLES_NXDEMO_BPP == 4
 #  define RENDERER nxf_convert_4bpp
 #elif CONFIG_EXAMPLES_NXDEMO_BPP == 8
 #  define RENDERER nxf_convert_8bpp
 #elif CONFIG_EXAMPLES_NXDEMO_BPP == 16
 #  define RENDERER nxf_convert_16bpp
 #elif CONFIG_EXAMPLES_NXDEMO_BPP == 24
 #  define RENDERER nxf_convert_24bpp
 #elif CONFIG_EXAMPLES_NXDEMO_BPP == 32
 #  define RENDERER nxf_convert_32bpp
 #else
 #  error "Unsupported CONFIG_EXAMPLES_NXDEMO_BPP"
 #endif

 /****************************************************************************
  * Private Function Prototypes
  ****************************************************************************/

 static void nxdemo_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
                           bool morem, FAR void *arg);
 static void nxdemo_position(NXWINDOW hwnd,
                             FAR const struct nxgl_size_s *size,
                             FAR const struct nxgl_point_s *pos,
                             FAR const struct nxgl_rect_s *bounds,
                             FAR void *arg);
 #ifdef CONFIG_NX_XYINPUT
 static void nxdemo_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
                            uint8_t buttons, FAR void *arg);
 #endif

 #ifdef CONFIG_NX_KBD
 static void nxdemo_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
                          FAR void *arg);
 #endif

 static void nxdemo_demo_1(NXWINDOW hwnd);
 static void nxdemo_demo_2(NXWINDOW hwnd);
 static void nxdemo_demo_3(NXWINDOW hwnd);

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

 /* Background window call table */

 const struct nx_callback_s g_nxdemocb =
 {
   nxdemo_redraw,    /* redraw */
   nxdemo_position   /* position */
 #ifdef CONFIG_NX_XYINPUT
   , nxdemo_mousein  /* mousein */
 #endif
 #ifdef CONFIG_NX_KBD
   , nxdemo_kbdin    /* kbdin */
 #endif
   , NULL            /* event */
 };

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

 /****************************************************************************
  * Name: nxdemo_redraw
  ****************************************************************************/

 static void nxdemo_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
                               bool more, FAR void *arg)
 {
   ginfo("hwnd=%p rect={(%d,%d),(%d,%d)} more=%s\n",
         hwnd, rect->pt1.x, rect->pt1.y, rect->pt2.x, rect->pt2.y,
         more ? "true" : "false");
 }

 /****************************************************************************
  * Name: nxdemo_position
  ****************************************************************************/

 static void nxdemo_position(NXWINDOW hwnd,
                             FAR const struct nxgl_size_s *size,
                             FAR const struct nxgl_point_s *pos,
                             FAR const struct nxgl_rect_s *bounds,
                             FAR void *arg)
 {
   /* Report the position */

   ginfo("hwnd=%p size=(%d,%d) pos=(%d,%d) bounds={(%d,%d),(%d,%d)}\n",
         hwnd, size->w, size->h, pos->x, pos->y,
         bounds->pt1.x, bounds->pt1.y, bounds->pt2.x, bounds->pt2.y);

   /* Have we picked off the window bounds yet? */

   if (!g_nxdemo.havepos)
     {
       /* Save the background window handle */

       g_nxdemo.hbkgd = hwnd;

       /* Save the window limits */

       g_nxdemo.xres = bounds->pt2.x + 1;
       g_nxdemo.yres = bounds->pt2.y + 1;

       g_nxdemo.havepos = true;
       sem_post(&g_nxdemo.eventsem);
       ginfo("Have xres=%d yres=%d\n", g_nxdemo.xres, g_nxdemo.yres);
     }
 }

 /****************************************************************************
  * Name: nxdemo_mousein
  ****************************************************************************/

 #ifdef CONFIG_NX_XYINPUT
 static void nxdemo_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
                                uint8_t buttons, FAR void *arg)
 {
   printf("nxdemo_mousein: hwnd=%p pos=(%d,%d) button=%02x\n",
          hwnd, pos->x, pos->y, buttons);
 }
 #endif

 /****************************************************************************
  * Name: nxdemo_kbdin
  ****************************************************************************/

 #ifdef CONFIG_NX_KBD
 static void nxdemo_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
                              FAR void *arg)
 {
   ginfo("hwnd=%p nch=%d\n", hwnd, nch);

   /* In this example, there is no keyboard so a keyboard event is not
    * expected.
    */

   printf("nxdemo_kbdin: Unexpected keyboard callback\n");
 }
 #endif

 /****************************************************************************
  * Name: nxdemo_demo_1
  ****************************************************************************/

 static void nxdemo_demo_1(NXWINDOW hwnd)
 {
   struct nxgl_point_s center;
   nxgl_mxpixel_t color[CONFIG_NX_NPLANES];
   nxgl_coord_t circle_radius = 0;
   bool direction_x = false;
   bool direction_y = false;
   int ret;
   int i;

   circle_radius = 3;
   i = 0;
   center.x = center.y = circle_radius * 2;

   while (i < 270)
     {
       if (direction_x == false)
         {
           center.x++;
         }
       else
         {
           center.x--;
         }

       if (center.x >= g_nxdemo.xres - circle_radius)
         {
           direction_x = true;
         }
       else if (center.x <= circle_radius)
         {
           direction_x = false;
         }

       if (direction_y == false)
         {
           center.y++;
         }
       else
         {
           center.y--;
         }

       if (center.y >= g_nxdemo.yres - circle_radius)
         {
           direction_y = true;
         }
       else if (center.y <= circle_radius)
         {
           direction_y = false;
         }

       color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
       ret = nx_drawcircle((NXWINDOW)hwnd, &center, circle_radius, 1, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }

       usleep(30000);

       color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
       ret = nx_drawcircle((NXWINDOW)hwnd, &center, circle_radius, 1, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }

       i++;
     }

   center.x = g_nxdemo.xres >> 1;
   center.y = g_nxdemo.yres >> 1;

   for (i = 0; i < (MIN(g_nxdemo.xres, g_nxdemo.yres) >> 1); i++)
     {
       circle_radius = i;

       color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
       ret = nx_fillcircle((NXWINDOW)hwnd, &center, circle_radius, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }

       usleep(100000);

       color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
       ret = nx_fillcircle((NXWINDOW)hwnd, &center, circle_radius, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }
     }

   for (i = MIN(g_nxdemo.xres, g_nxdemo.yres) >> 1; i > 1; i--)
     {
       circle_radius = i;

       color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
       ret = nx_fillcircle((NXWINDOW)hwnd, &center, circle_radius, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }

       usleep(100000);

       color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
       ret = nx_fillcircle((NXWINDOW)hwnd, &center, circle_radius, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }
     }
 }

 /****************************************************************************
  * Name: nxdemo_demo_2
  ****************************************************************************/

 static void nxdemo_demo_2(NXWINDOW hwnd)
 {
   struct nxgl_point_s center;
   struct nxgl_rect_s rect;
   nxgl_mxpixel_t color[CONFIG_NX_NPLANES];
   int ret;
   int i;

   center.x = g_nxdemo.xres >> 1;
   center.y = g_nxdemo.yres >> 1;

   for (i = 0; i < (MIN(g_nxdemo.xres, g_nxdemo.yres) >> 1); i++)
     {
       rect.pt1.x = center.x - i;
       rect.pt1.y = center.y - i;
       rect.pt2.x = center.x + i;
       rect.pt2.y = center.y + i;

       color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
       ret = nx_fill((NXWINDOW)hwnd, &rect, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }

       usleep(100000);

       color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
       ret = nx_fill((NXWINDOW)hwnd, &rect, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }
     }

   for (i = MIN(g_nxdemo.xres, g_nxdemo.yres) >> 1; i > 1; i--)
     {
       rect.pt1.x = center.x - i;
       rect.pt1.y = center.y - i;
       rect.pt2.x = center.x + i;
       rect.pt2.y = center.y + i;

       color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
       ret = nx_fill((NXWINDOW)hwnd, &rect, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }

       usleep(100000);

       color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
       ret = nx_fill((NXWINDOW)hwnd, &rect, color);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
         }
     }
 }

 /****************************************************************************
  * Name: nxdemo_demo_3
  ****************************************************************************/

 static void nxdemo_demo_3(NXWINDOW hwnd)
 {
   struct nxgl_vector_s vect;
   nxgl_mxpixel_t color[CONFIG_NX_NPLANES];
   nxgl_coord_t line_width = 2;
   int ret;
   int i;

   for (i = 0; i < g_nxdemo.yres; i++)
     {
       vect.pt1.x = 0;
       vect.pt1.y = i;
       vect.pt2.x = g_nxdemo.xres;
       vect.pt2.y = i;

       color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
       ret = nx_drawline((NXWINDOW)hwnd,
                         &vect,
                         line_width,
                         color, NX_LINECAP_NONE);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawline failed: %d\n", ret);
         }

       usleep(50000);

       color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
       ret = nx_drawline((NXWINDOW)hwnd,
                         &vect,
                         line_width,
                         color, NX_LINECAP_NONE);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawline failed: %d\n", ret);
         }
     }

   for (i = 0; i < g_nxdemo.xres; i++)
     {
       vect.pt1.x = i;
       vect.pt1.y = 0;
       vect.pt2.x = i;
       vect.pt2.y = g_nxdemo.yres;

       color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
       ret = nx_drawline((NXWINDOW)hwnd,
                         &vect,
                         line_width,
                         color, NX_LINECAP_NONE);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawline failed: %d\n", ret);
         }

       usleep(50000);

       color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
       ret = nx_drawline((NXWINDOW)hwnd,
                         &vect,
                         line_width,
                         color, NX_LINECAP_NONE);
       if (ret < 0)
         {
           printf("nxnxdemo: nx_drawline failed: %d\n", ret);
         }
     }
 }

 /****************************************************************************
  * Name: nxdemo_demo_4
  ****************************************************************************/

 static void nxdemo_demo_4(NXWINDOW hwnd)
 {
   struct nxgl_point_s origin;
   struct nxgl_rect_s rect;
   FAR const void *src[CONFIG_NX_NPLANES];
   int ret;

   rect.pt1.x = 0;
   rect.pt1.y = 0;
   rect.pt2.x = 23;
   rect.pt2.y = 23;

   origin.x   = 0;
   origin.y   = 0;

   src[0] = g_battery;

   ret = nx_bitmap((NXWINDOW)hwnd,
                   &rect,
                   src,
                   &origin,
                   3);
   if (ret < 0)
     {
       printf("nxnxdemo: nx_bitmap failed: %d\n", ret);
     }

   sleep(5);
 }

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

 /****************************************************************************
  * Name: nxdemo_hello
  *
  * Description:
  *   Demo displaying graphic on the screen
  *
  ****************************************************************************/

 void nxdemo_hello(NXWINDOW hwnd)
 {
   nxdemo_demo_1((NXWINDOW)hwnd);
   nxdemo_demo_2((NXWINDOW)hwnd);
   nxdemo_demo_3((NXWINDOW)hwnd);
   nxdemo_demo_4((NXWINDOW)hwnd);
 }
	/****************************************************************************
	* apps/examples/nxdemo/nxdemo_bkgd.c
	*
	* 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 <stdint.h>
	#include <stdbool.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <semaphore.h>
	#include <sys/param.h>
	#include <errno.h>
	#include <debug.h>
	#include <unistd.h>

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

	#include "nxdemo.h"
	#include "images.h"

	/****************************************************************************
	* Pre-processor Definitions
	****************************************************************************/

	/* Select renderer -- Some additional logic would be required to support
	* pixel depths that are not directly addressable (1,2,4, and 24).
	*/

	#if CONFIG_EXAMPLES_NXDEMO_BPP == 1
	# define RENDERER nxf_convert_1bpp
	#elif CONFIG_EXAMPLES_NXDEMO_BPP == 2
	# define RENDERER nxf_convert_2bpp
	#elif CONFIG_EXAMPLES_NXDEMO_BPP == 4
	# define RENDERER nxf_convert_4bpp
	#elif CONFIG_EXAMPLES_NXDEMO_BPP == 8
	# define RENDERER nxf_convert_8bpp
	#elif CONFIG_EXAMPLES_NXDEMO_BPP == 16
	# define RENDERER nxf_convert_16bpp
	#elif CONFIG_EXAMPLES_NXDEMO_BPP == 24
	# define RENDERER nxf_convert_24bpp
	#elif CONFIG_EXAMPLES_NXDEMO_BPP == 32
	# define RENDERER nxf_convert_32bpp
	#else
	# error "Unsupported CONFIG_EXAMPLES_NXDEMO_BPP"
	#endif

	/****************************************************************************
	* Private Function Prototypes
	****************************************************************************/

	static void nxdemo_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
	bool morem, FAR void *arg);
	static void nxdemo_position(NXWINDOW hwnd,
	FAR const struct nxgl_size_s *size,
	FAR const struct nxgl_point_s *pos,
	FAR const struct nxgl_rect_s *bounds,
	FAR void *arg);
	#ifdef CONFIG_NX_XYINPUT
	static void nxdemo_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
	uint8_t buttons, FAR void *arg);
	#endif

	#ifdef CONFIG_NX_KBD
	static void nxdemo_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
	FAR void *arg);
	#endif

	static void nxdemo_demo_1(NXWINDOW hwnd);
	static void nxdemo_demo_2(NXWINDOW hwnd);
	static void nxdemo_demo_3(NXWINDOW hwnd);

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

	/* Background window call table */

	const struct nx_callback_s g_nxdemocb =
	{
	nxdemo_redraw, /* redraw */
	nxdemo_position /* position */
	#ifdef CONFIG_NX_XYINPUT
	, nxdemo_mousein /* mousein */
	#endif
	#ifdef CONFIG_NX_KBD
	, nxdemo_kbdin /* kbdin */
	#endif
	, NULL /* event */
	};

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

	/****************************************************************************
	* Name: nxdemo_redraw
	****************************************************************************/

	static void nxdemo_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
	bool more, FAR void *arg)
	{
	ginfo("hwnd=%p rect={(%d,%d),(%d,%d)} more=%s\n",
	hwnd, rect->pt1.x, rect->pt1.y, rect->pt2.x, rect->pt2.y,
	more ? "true" : "false");
	}

	/****************************************************************************
	* Name: nxdemo_position
	****************************************************************************/

	static void nxdemo_position(NXWINDOW hwnd,
	FAR const struct nxgl_size_s *size,
	FAR const struct nxgl_point_s *pos,
	FAR const struct nxgl_rect_s *bounds,
	FAR void *arg)
	{
	/* Report the position */

	ginfo("hwnd=%p size=(%d,%d) pos=(%d,%d) bounds={(%d,%d),(%d,%d)}\n",
	hwnd, size->w, size->h, pos->x, pos->y,
	bounds->pt1.x, bounds->pt1.y, bounds->pt2.x, bounds->pt2.y);

	/* Have we picked off the window bounds yet? */

	if (!g_nxdemo.havepos)
	{
	/* Save the background window handle */

	g_nxdemo.hbkgd = hwnd;

	/* Save the window limits */

	g_nxdemo.xres = bounds->pt2.x + 1;
	g_nxdemo.yres = bounds->pt2.y + 1;

	g_nxdemo.havepos = true;
	sem_post(&g_nxdemo.eventsem);
	ginfo("Have xres=%d yres=%d\n", g_nxdemo.xres, g_nxdemo.yres);
	}
	}

	/****************************************************************************
	* Name: nxdemo_mousein
	****************************************************************************/

	#ifdef CONFIG_NX_XYINPUT
	static void nxdemo_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
	uint8_t buttons, FAR void *arg)
	{
	printf("nxdemo_mousein: hwnd=%p pos=(%d,%d) button=%02x\n",
	hwnd, pos->x, pos->y, buttons);
	}
	#endif

	/****************************************************************************
	* Name: nxdemo_kbdin
	****************************************************************************/

	#ifdef CONFIG_NX_KBD
	static void nxdemo_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
	FAR void *arg)
	{
	ginfo("hwnd=%p nch=%d\n", hwnd, nch);

	/* In this example, there is no keyboard so a keyboard event is not
	* expected.
	*/

	printf("nxdemo_kbdin: Unexpected keyboard callback\n");
	}
	#endif

	/****************************************************************************
	* Name: nxdemo_demo_1
	****************************************************************************/

	static void nxdemo_demo_1(NXWINDOW hwnd)
	{
	struct nxgl_point_s center;
	nxgl_mxpixel_t color[CONFIG_NX_NPLANES];
	nxgl_coord_t circle_radius = 0;
	bool direction_x = false;
	bool direction_y = false;
	int ret;
	int i;

	circle_radius = 3;
	i = 0;
	center.x = center.y = circle_radius * 2;

	while (i < 270)
	{
	if (direction_x == false)
	{
	center.x++;
	}
	else
	{
	center.x--;
	}

	if (center.x >= g_nxdemo.xres - circle_radius)
	{
	direction_x = true;
	}
	else if (center.x <= circle_radius)
	{
	direction_x = false;
	}

	if (direction_y == false)
	{
	center.y++;
	}
	else
	{
	center.y--;
	}

	if (center.y >= g_nxdemo.yres - circle_radius)
	{
	direction_y = true;
	}
	else if (center.y <= circle_radius)
	{
	direction_y = false;
	}

	color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
	ret = nx_drawcircle((NXWINDOW)hwnd, &center, circle_radius, 1, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}

	usleep(30000);

	color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
	ret = nx_drawcircle((NXWINDOW)hwnd, &center, circle_radius, 1, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}

	i++;
	}

	center.x = g_nxdemo.xres >> 1;
	center.y = g_nxdemo.yres >> 1;

	for (i = 0; i < (MIN(g_nxdemo.xres, g_nxdemo.yres) >> 1); i++)
	{
	circle_radius = i;

	color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
	ret = nx_fillcircle((NXWINDOW)hwnd, &center, circle_radius, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}

	usleep(100000);

	color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
	ret = nx_fillcircle((NXWINDOW)hwnd, &center, circle_radius, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}
	}

	for (i = MIN(g_nxdemo.xres, g_nxdemo.yres) >> 1; i > 1; i--)
	{
	circle_radius = i;

	color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
	ret = nx_fillcircle((NXWINDOW)hwnd, &center, circle_radius, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}

	usleep(100000);

	color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
	ret = nx_fillcircle((NXWINDOW)hwnd, &center, circle_radius, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}
	}
	}

	/****************************************************************************
	* Name: nxdemo_demo_2
	****************************************************************************/

	static void nxdemo_demo_2(NXWINDOW hwnd)
	{
	struct nxgl_point_s center;
	struct nxgl_rect_s rect;
	nxgl_mxpixel_t color[CONFIG_NX_NPLANES];
	int ret;
	int i;

	center.x = g_nxdemo.xres >> 1;
	center.y = g_nxdemo.yres >> 1;

	for (i = 0; i < (MIN(g_nxdemo.xres, g_nxdemo.yres) >> 1); i++)
	{
	rect.pt1.x = center.x - i;
	rect.pt1.y = center.y - i;
	rect.pt2.x = center.x + i;
	rect.pt2.y = center.y + i;

	color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
	ret = nx_fill((NXWINDOW)hwnd, &rect, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}

	usleep(100000);

	color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
	ret = nx_fill((NXWINDOW)hwnd, &rect, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}
	}

	for (i = MIN(g_nxdemo.xres, g_nxdemo.yres) >> 1; i > 1; i--)
	{
	rect.pt1.x = center.x - i;
	rect.pt1.y = center.y - i;
	rect.pt2.x = center.x + i;
	rect.pt2.y = center.y + i;

	color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
	ret = nx_fill((NXWINDOW)hwnd, &rect, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}

	usleep(100000);

	color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
	ret = nx_fill((NXWINDOW)hwnd, &rect, color);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawcircle failed: %d\n", ret);
	}
	}
	}

	/****************************************************************************
	* Name: nxdemo_demo_3
	****************************************************************************/

	static void nxdemo_demo_3(NXWINDOW hwnd)
	{
	struct nxgl_vector_s vect;
	nxgl_mxpixel_t color[CONFIG_NX_NPLANES];
	nxgl_coord_t line_width = 2;
	int ret;
	int i;

	for (i = 0; i < g_nxdemo.yres; i++)
	{
	vect.pt1.x = 0;
	vect.pt1.y = i;
	vect.pt2.x = g_nxdemo.xres;
	vect.pt2.y = i;

	color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
	ret = nx_drawline((NXWINDOW)hwnd,
	&vect,
	line_width,
	color, NX_LINECAP_NONE);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawline failed: %d\n", ret);
	}

	usleep(50000);

	color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
	ret = nx_drawline((NXWINDOW)hwnd,
	&vect,
	line_width,
	color, NX_LINECAP_NONE);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawline failed: %d\n", ret);
	}
	}

	for (i = 0; i < g_nxdemo.xres; i++)
	{
	vect.pt1.x = i;
	vect.pt1.y = 0;
	vect.pt2.x = i;
	vect.pt2.y = g_nxdemo.yres;

	color[0] = CONFIG_EXAMPLES_NXDEMO_DRAWCOLOR;
	ret = nx_drawline((NXWINDOW)hwnd,
	&vect,
	line_width,
	color, NX_LINECAP_NONE);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawline failed: %d\n", ret);
	}

	usleep(50000);

	color[0] = CONFIG_EXAMPLES_NXDEMO_BGCOLOR;
	ret = nx_drawline((NXWINDOW)hwnd,
	&vect,
	line_width,
	color, NX_LINECAP_NONE);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_drawline failed: %d\n", ret);
	}
	}
	}

	/****************************************************************************
	* Name: nxdemo_demo_4
	****************************************************************************/

	static void nxdemo_demo_4(NXWINDOW hwnd)
	{
	struct nxgl_point_s origin;
	struct nxgl_rect_s rect;
	FAR const void *src[CONFIG_NX_NPLANES];
	int ret;

	rect.pt1.x = 0;
	rect.pt1.y = 0;
	rect.pt2.x = 23;
	rect.pt2.y = 23;

	origin.x = 0;
	origin.y = 0;

	src[0] = g_battery;

	ret = nx_bitmap((NXWINDOW)hwnd,
	&rect,
	src,
	&origin,
	3);
	if (ret < 0)
	{
	printf("nxnxdemo: nx_bitmap failed: %d\n", ret);
	}

	sleep(5);
	}

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

	/****************************************************************************
	* Name: nxdemo_hello
	*
	* Description:
	* Demo displaying graphic on the screen
	*
	****************************************************************************/

	void nxdemo_hello(NXWINDOW hwnd)
	{
	nxdemo_demo_1((NXWINDOW)hwnd);
	nxdemo_demo_2((NXWINDOW)hwnd);
	nxdemo_demo_3((NXWINDOW)hwnd);
	nxdemo_demo_4((NXWINDOW)hwnd);
	}