Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3

apps/examples/nxlines/Kconfig

@@ -0,0 +1,13 @@
+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+config EXAMPLES_NXLINES
+	bool "NX graphics lines example"
+	default n
+	---help---
+		Enable the X graphics lines example
+
+if EXAMPLES_NXLINES
+endif

apps/examples/nxlines/Makefile

@@ -0,0 +1,105 @@
+############################################################################
+# apps/examples/nxlines/Makefile
+#
+#   Copyright (C) 2011 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.
+#
+############################################################################
+
+-include $(TOPDIR)/.config
+-include $(TOPDIR)/Make.defs
+include $(APPDIR)/Make.defs
+
+# NuttX NX Graphics Example.
+
+ASRCS		=
+CSRCS		= nxlines_main.c nxlines_bkgd.c
+
+AOBJS		= $(ASRCS:.S=$(OBJEXT))
+COBJS		= $(CSRCS:.c=$(OBJEXT))
+
+SRCS		= $(ASRCS) $(CSRCS)
+OBJS		= $(AOBJS) $(COBJS)
+
+ifeq ($(WINTOOL),y)
+  BIN		= "${shell cygpath -w  $(APPDIR)/libapps$(LIBEXT)}"
+else
+  BIN		= "$(APPDIR)/libapps$(LIBEXT)"
+endif
+
+ROOTDEPPATH	= --dep-path .
+
+# NXLINES built-in application info
+
+APPNAME		= nxlines
+PRIORITY	= SCHED_PRIORITY_DEFAULT
+STACKSIZE	= 2048
+
+# Common build
+
+VPATH		= 
+
+all: .built
+.PHONY: context clean depend distclean
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+.built: $(OBJS)
+	@( for obj in $(OBJS) ; do \
+		$(call ARCHIVE, $(BIN), $${obj}); \
+	done ; )
+	@touch .built
+
+.context:
+ifeq ($(CONFIG_EXAMPLES_NXLINES_BUILTIN),y)
+	$(call REGISTER,$(APPNAME),$(PRIORITY),$(STACKSIZE),$(APPNAME)_main)
+	@touch $@
+endif
+
+context: .context
+
+.depend: Makefile $(SRCS)
+	@$(MKDEP) $(ROOTDEPPATH) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	@touch $@
+
+depend: .depend
+
+clean:
+	@rm -f *.o *~ .*.swp .built
+	$(call CLEAN)
+
+distclean: clean
+	@rm -f Make.dep .depend
+
+-include Make.dep

apps/examples/nxlines/nxlines.h

@@ -0,0 +1,197 @@
+/****************************************************************************
+ * examples/nxlines/nxlines.h
+ *
+ *   Copyright (C) 2011-2012 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.
+ *
+ ****************************************************************************/
+
+#ifndef __APPS_EXAMPLES_NXLINES_NXLINES_H
+#define __APPS_EXAMPLES_NXLINES_NXLINES_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <semaphore.h>
+
+#include <nuttx/nx/nxglib.h>
+#include <nuttx/nx/nx.h>
+#include <nuttx/rgbcolors.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* Configuration ************************************************************/
+
+#ifndef CONFIG_NX
+#  error "NX is not enabled (CONFIG_NX)"
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXLINES_VPLANE
+#    define CONFIG_EXAMPLES_NXLINES_VPLANE 0
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXLINES_BPP
+#  define CONFIG_EXAMPLES_NXLINES_BPP 16
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXLINES_BGCOLOR
+#  if CONFIG_EXAMPLES_NXLINES_BPP == 24 || CONFIG_EXAMPLES_NXLINES_BPP == 32
+#    define CONFIG_EXAMPLES_NXLINES_BGCOLOR RGB24_DARKGREEN
+#  elif CONFIG_EXAMPLES_NXLINES_BPP == 16
+#    define CONFIG_EXAMPLES_NXLINES_BGCOLOR RGB16_DARKGREEN
+#  else
+#    define CONFIG_EXAMPLES_NXLINES_BGCOLOR RGB8_DARKGREEN
+#  endif
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXLINES_LINEWIDTH
+#  define CONFIG_EXAMPLES_NXLINES_LINEWIDTH 16
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXLINES_LINECOLOR
+#  if CONFIG_EXAMPLES_NXLINES_BPP == 24 || CONFIG_EXAMPLES_NXLINES_BPP == 32
+#    define CONFIG_EXAMPLES_NXLINES_LINECOLOR RGB24_YELLOW
+#  elif CONFIG_EXAMPLES_NXLINES_BPP == 16
+#    define CONFIG_EXAMPLES_NXLINES_LINECOLOR RGB16_YELLOW
+#  else
+#    define CONFIG_EXAMPLES_NXLINES_LINECOLOR RGB8_YELLOW
+#  endif
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXLINES_BORDERWIDTH
+#  define CONFIG_EXAMPLES_NXLINES_BORDERWIDTH 16
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXLINES_BORDERCOLOR
+#  if CONFIG_EXAMPLES_NXLINES_BPP == 24 || CONFIG_EXAMPLES_NXLINES_BPP == 32
+#    define CONFIG_EXAMPLES_NXLINES_BORDERCOLOR RGB24_YELLOW
+#  elif CONFIG_EXAMPLES_NXLINES_BPP == 16
+#    define CONFIG_EXAMPLES_NXLINES_BORDERCOLOR RGB16_YELLOW
+#  else
+#    define CONFIG_EXAMPLES_NXLINES_BORDERCOLOR RGB8_YELLOW
+#  endif
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXLINES_CIRCLECOLOR
+#  if CONFIG_EXAMPLES_NXLINES_BPP == 24 || CONFIG_EXAMPLES_NXLINES_BPP == 32
+#    define CONFIG_EXAMPLES_NXLINES_CIRCLECOLOR RGB24_BEIGE
+#  elif CONFIG_EXAMPLES_NXLINES_BPP == 16
+#    define CONFIG_EXAMPLES_NXLINES_CIRCLECOLOR RGB16_BEIGE
+#  else
+#    define CONFIG_EXAMPLES_NXLINES_CIRCLECOLOR RGB8_YELLOW
+#  endif
+#endif
+
+/* Debug ********************************************************************/
+
+#ifdef CONFIG_CPP_HAVE_VARARGS
+#  ifdef CONFIG_DEBUG
+#    define message(...) lib_lowprintf(__VA_ARGS__)
+#    define msgflush()
+#  else
+#    define message(...) printf(__VA_ARGS__)
+#    define msgflush() fflush(stdout)
+#  endif
+#else
+#  ifdef CONFIG_DEBUG
+#    define message lib_lowprintf
+#    define msgflush()
+#  else
+#    define message printf
+#    define msgflush() fflush(stdout)
+#  endif
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+enum exitcode_e
+{
+  NXEXIT_SUCCESS = 0,
+  NXEXIT_EXTINITIALIZE,
+  NXEXIT_FBINITIALIZE,
+  NXEXIT_FBGETVPLANE,
+  NXEXIT_LCDINITIALIZE,
+  NXEXIT_LCDGETDEV,
+  NXEXIT_NXOPEN,
+  NXEXIT_NXREQUESTBKGD,
+  NXEXIT_NXSETBGCOLOR
+};
+
+struct nxlines_data_s
+{
+  /* The NX handles */
+
+  NXHANDLE hnx;
+  NXHANDLE hbkgd;
+
+  /* The screen resolution */
+
+  nxgl_coord_t xres;
+  nxgl_coord_t yres;
+
+  volatile bool havepos;
+  sem_t sem;
+  volatile int code;
+};
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/* NXLINES state data */
+
+extern struct nxlines_data_s g_nxlines;
+
+/* NX callback vtables */
+
+extern const struct nx_callback_s g_nxlinescb;
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef CONFIG_EXAMPLES_NXLINES_EXTERNINIT
+extern FAR NX_DRIVERTYPE *up_nxdrvinit(unsigned int devno);
+#endif
+
+/* Background window interfaces */
+
+extern void nxlines_test(NXWINDOW hwnd);
+
+#endif /* __APPS_EXAMPLES_NXLINES_NXLINES_H */

apps/examples/nxlines/nxlines_bkgd.c

@@ -0,0 +1,335 @@
+/****************************************************************************
+ * examples/nxlines/nxlines_bkgd.c
+ *
+ *   Copyright (C) 2011-2012 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 <unistd.h>
+#include <string.h>
+#include <debug.h>
+#include <fixedmath.h>
+
+#include <nuttx/nx/nx.h>
+#include <nuttx/nx/nxglib.h>
+
+#include "nxlines.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#ifndef MIN
+#  define MIN(a,b) (a < b ? a : b)
+#endif
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static void nxlines_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
+                        bool morem, FAR void *arg);
+static void nxlines_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_MOUSE
+static void nxlines_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
+                         uint8_t buttons, FAR void *arg);
+#endif
+
+#ifdef CONFIG_NX_KBD
+static void nxlines_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
+                       FAR void *arg);
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* Background window call table */
+
+const struct nx_callback_s g_nxlinescb =
+{
+  nxlines_redraw,   /* redraw */
+  nxlines_position  /* position */
+#ifdef CONFIG_NX_MOUSE
+  , nxlines_mousein /* mousein */
+#endif
+#ifdef CONFIG_NX_KBD
+  , nxlines_kbdin   /* my kbdin */
+#endif
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxlines_redraw
+ ****************************************************************************/
+
+static void nxlines_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
+                        bool more, FAR void *arg)
+{
+  gvdbg("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: nxlines_position
+ ****************************************************************************/
+
+static void nxlines_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 */
+
+  gvdbg("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_nxlines.havepos)
+    {
+      /* Save the background window handle */
+
+      g_nxlines.hbkgd = hwnd;
+
+      /* Save the window limits */
+
+      g_nxlines.xres = bounds->pt2.x + 1;
+      g_nxlines.yres = bounds->pt2.y + 1;
+
+      g_nxlines.havepos = true;
+      sem_post(&g_nxlines.sem);
+      gvdbg("Have xres=%d yres=%d\n", g_nxlines.xres, g_nxlines.yres);
+    }
+}
+
+/****************************************************************************
+ * Name: nxlines_mousein
+ ****************************************************************************/
+
+#ifdef CONFIG_NX_MOUSE
+static void nxlines_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
+                         uint8_t buttons, FAR void *arg)
+{
+  message("nxlines_mousein: hwnd=%p pos=(%d,%d) button=%02x\n",
+          hwnd,  pos->x, pos->y, buttons);
+}
+#endif
+
+/****************************************************************************
+ * Name: nxlines_kbdin
+ ****************************************************************************/
+
+#ifdef CONFIG_NX_KBD
+static void nxlines_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
+                       FAR void *arg)
+{
+  gvdbg("hwnd=%p nch=%d\n", hwnd, nch);
+
+   /* In this example, there is no keyboard so a keyboard event is not
+    * expected.
+    */
+
+   message("nxlines_kbdin: Unexpected keyboard callback\n");
+}
+#endif
+
+ /****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxlines_test
+ *
+ * Description:
+ *   Print "Hello, World!" in the center of the display.
+ *
+ ****************************************************************************/
+
+void nxlines_test(NXWINDOW hwnd)
+{
+  struct nxgl_point_s center;
+  struct nxgl_vector_s vector;
+  struct nxgl_vector_s previous;
+  nxgl_mxpixel_t color[CONFIG_NX_NPLANES];
+  nxgl_coord_t maxradius;
+  nxgl_coord_t radius;
+  nxgl_coord_t halfx;
+  nxgl_coord_t halfy;
+  b16_t angle;
+  int ret;
+
+  /* Get the maximum radius and center of the circle */
+
+  maxradius = MIN(g_nxlines.yres, g_nxlines.xres) >> 1;
+  center.x  = g_nxlines.xres >> 1;
+  center.y  = g_nxlines.yres >> 1;
+
+  /* Draw a circular background */
+
+  radius = maxradius - ((CONFIG_EXAMPLES_NXLINES_BORDERWIDTH+1)/2);
+  color[0] = CONFIG_EXAMPLES_NXLINES_CIRCLECOLOR;
+  ret = nx_fillcircle((NXWINDOW)hwnd, &center, radius, color);
+  if (ret < 0)
+    {
+      message("nxlines_test: nx_fillcircle failed: %d\n", ret);
+    }
+
+  /* Draw the circular border */
+
+  color[0] = CONFIG_EXAMPLES_NXLINES_BORDERCOLOR;
+  ret = nx_drawcircle((NXWINDOW)hwnd, &center, radius,
+                      CONFIG_EXAMPLES_NXLINES_BORDERWIDTH, color);
+  if (ret < 0)
+    {
+      message("nxlines_test: nx_fillcircle 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_NXLINES_BORDERWIDTH + 80))
+    {
+      radius = maxradius - (CONFIG_EXAMPLES_NXLINES_BORDERWIDTH + 40);
+    }
+  else if (maxradius > (CONFIG_EXAMPLES_NXLINES_BORDERWIDTH + 60))
+    {
+      radius = maxradius - (CONFIG_EXAMPLES_NXLINES_BORDERWIDTH + 30);
+    }
+  else if (maxradius > (CONFIG_EXAMPLES_NXLINES_BORDERWIDTH + 40))
+    {
+      radius = maxradius - (CONFIG_EXAMPLES_NXLINES_BORDERWIDTH + 20);
+    }
+  else if (maxradius > (CONFIG_EXAMPLES_NXLINES_BORDERWIDTH + 20))
+    {
+      radius = maxradius - (CONFIG_EXAMPLES_NXLINES_BORDERWIDTH + 10);
+    }
+  else
+    {
+      radius = maxradius - CONFIG_EXAMPLES_NXLINES_BORDERWIDTH;
+    }
+
+  /* The loop, showing the line in various orientations */
+
+  angle = 0;
+  previous.pt1.x = center.x;
+  previous.pt1.y = center.y;
+  previous.pt2.x = center.x;
+  previous.pt2.y = center.y;
+
+  for (;;)
+    {
+      /* Determine the position of the line on this pass */
+
+      halfx = b16toi(b16muli(b16sin(angle), radius));
+      halfy = b16toi(b16muli(b16cos(angle), radius));
+
+      vector.pt1.x = center.x + halfx;
+      vector.pt1.y = center.y + halfy;
+      vector.pt2.x = center.x - halfx;
+      vector.pt2.y = center.y - halfy;
+
+      message("Angle: %08x vector: (%d,%d)->(%d,%d)\n",
+              angle, vector.pt1.x, vector.pt1.y, vector.pt2.x, vector.pt2.y);
+
+      /* Clear the previous line by overwriting it with the circle color */
+
+      color[0] = CONFIG_EXAMPLES_NXLINES_CIRCLECOLOR;
+      ret = nx_drawline((NXWINDOW)hwnd, &previous, CONFIG_EXAMPLES_NXLINES_LINEWIDTH, color);
+      if (ret < 0)
+        {
+          message("nxlines_test: nx_drawline failed clearing: %d\n", ret);
+        }
+
+      /* Draw the new line */
+
+      color[0] = CONFIG_EXAMPLES_NXLINES_LINECOLOR;
+      ret = nx_drawline((NXWINDOW)hwnd, &vector, CONFIG_EXAMPLES_NXLINES_LINEWIDTH, color);
+      if (ret < 0)
+        {
+          message("nxlines_test: nx_drawline failed clearing: %d\n", ret);
+        }
+
+      /* Set up for the next time through the loop then sleep for a bit. */
+
+      angle += b16PI / 16;  /* 32 angular positions in full circle */
+
+      /* Check if we have gone all the way around */
+
+      if (angle > (31 *  (2 * b16PI) / 32))
+        {
+#ifdef CONFIG_EXAMPLES_NXLINES_BUILTIN
+          /* If this example was built as an NSH add-on, then exit after we
+           * have gone all the way around once.
+           */
+
+          return;
+#else
+          /* Wrap back to zero and continue with the test */
+
+          angle = 0;
+#endif
+        }
+
+      memcpy(&previous, &vector, sizeof(struct nxgl_vector_s));
+      usleep(500*1000);
+    }
+}

apps/examples/nxlines/nxlines_main.c

@@ -0,0 +1,272 @@
+/****************************************************************************
+ * examples/nxlines/nxlines_main.c
+ *
+ *   Copyright (C) 2011-2012 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 <sys/types.h>
+
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <time.h>
+#include <string.h>
+#include <sched.h>
+#include <errno.h>
+#include <debug.h>
+
+#ifdef CONFIG_NX_LCDDRIVER
+#  include <nuttx/lcd/lcd.h>
+#else
+#  include <nuttx/fb.h>
+#endif
+
+#include <nuttx/arch.h>
+#include <nuttx/nx/nx.h>
+#include <nuttx/nx/nxglib.h>
+
+#include "nxlines.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Configuration ************************************************************/
+/* If not specified, assume that the hardware supports one video plane */
+
+#ifndef CONFIG_EXAMPLES_NXLINES_VPLANE
+#  define CONFIG_EXAMPLES_NXLINES_VPLANE 0
+#endif
+
+/* If not specified, assume that the hardware supports one LCD device */
+
+#ifndef CONFIG_EXAMPLES_NXLINES_DEVNO
+#  define CONFIG_EXAMPLES_NXLINES_DEVNO 0
+#endif
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+struct nxlines_data_s g_nxlines =
+{
+  NULL,          /* hnx */
+  NULL,          /* hbkgd */
+  0,             /* xres */
+  0,             /* yres */
+  false,         /* havpos */
+  { 0 },         /* sem */
+  NXEXIT_SUCCESS /* exit code */
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxlines_initialize
+ ****************************************************************************/
+
+static inline int nxlines_initialize(void)
+{
+  FAR NX_DRIVERTYPE *dev;
+
+#if defined(CONFIG_EXAMPLES_NXLINES_EXTERNINIT)
+  /* Use external graphics driver initialization */
+
+  message("nxlines_initialize: Initializing external graphics device\n");
+  dev = up_nxdrvinit(CONFIG_EXAMPLES_NXLINES_DEVNO);
+  if (!dev)
+    {
+      message("nxlines_initialize: up_nxdrvinit failed, devno=%d\n",
+              CONFIG_EXAMPLES_NXLINES_DEVNO);
+      g_nxlines.code = NXEXIT_EXTINITIALIZE;
+      return ERROR;
+    }
+
+#elif defined(CONFIG_NX_LCDDRIVER)
+  int ret;
+
+  /* Initialize the LCD device */
+
+  message("nxlines_initialize: Initializing LCD\n");
+  ret = up_lcdinitialize();
+  if (ret < 0)
+    {
+      message("nxlines_initialize: up_lcdinitialize failed: %d\n", -ret);
+      g_nxlines.code = NXEXIT_LCDINITIALIZE;
+      return ERROR;
+    }
+
+  /* Get the device instance */
+
+  dev = up_lcdgetdev(CONFIG_EXAMPLES_NXLINES_DEVNO);
+  if (!dev)
+    {
+      message("nxlines_initialize: up_lcdgetdev failed, devno=%d\n", CONFIG_EXAMPLES_NXLINES_DEVNO);
+      g_nxlines.code = NXEXIT_LCDGETDEV;
+      return ERROR;
+    }
+
+  /* Turn the LCD on at 75% power */
+
+  (void)dev->setpower(dev, ((3*CONFIG_LCD_MAXPOWER + 3)/4));
+#else
+  int ret;
+
+  /* Initialize the frame buffer device */
+
+  message("nxlines_initialize: Initializing framebuffer\n");
+  ret = up_fbinitialize();
+  if (ret < 0)
+    {
+      message("nxlines_initialize: up_fbinitialize failed: %d\n", -ret);
+      g_nxlines.code = NXEXIT_FBINITIALIZE;
+      return ERROR;
+    }
+
+  dev = up_fbgetvplane(CONFIG_EXAMPLES_NXLINES_VPLANE);
+  if (!dev)
+    {
+      message("nxlines_initialize: up_fbgetvplane failed, vplane=%d\n", CONFIG_EXAMPLES_NXLINES_VPLANE);
+      g_nxlines.code = NXEXIT_FBGETVPLANE;
+      return ERROR;
+    }
+#endif
+
+  /* Then open NX */
+
+  message("nxlines_initialize: Open NX\n");
+  g_nxlines.hnx = nx_open(dev);
+  if (!g_nxlines.hnx)
+    {
+      message("nxlines_initialize: nx_open failed: %d\n", errno);
+      g_nxlines.code = NXEXIT_NXOPEN;
+      return ERROR;
+    }
+  return OK;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxlines_main
+ ****************************************************************************/
+
+int nxlines_main(int argc, char *argv[])
+{
+  nxgl_mxpixel_t color;
+  int ret;
+
+  /* Initialize NX */
+
+  ret = nxlines_initialize();
+  message("nxlines_main: NX handle=%p\n", g_nxlines.hnx);
+  if (!g_nxlines.hnx || ret < 0)
+    {
+      message("nxlines_main: Failed to get NX handle: %d\n", errno);
+      g_nxlines.code = NXEXIT_NXOPEN;
+      goto errout;
+    }
+
+  /* Set the background to the configured background color */
+
+  message("nxlines_main: Set background color=%d\n",
+          CONFIG_EXAMPLES_NXLINES_BGCOLOR);
+
+  color = CONFIG_EXAMPLES_NXLINES_BGCOLOR;
+  ret = nx_setbgcolor(g_nxlines.hnx, &color);
+  if (ret < 0)
+    {
+      message("nxlines_main: nx_setbgcolor failed: %d\n", errno);
+      g_nxlines.code = NXEXIT_NXSETBGCOLOR;
+      goto errout_with_nx;
+    }
+
+  /* Get the background window */
+
+  ret = nx_requestbkgd(g_nxlines.hnx, &g_nxlinescb, NULL);
+  if (ret < 0)
+    {
+      message("nxlines_main: nx_setbgcolor failed: %d\n", errno);
+      g_nxlines.code = NXEXIT_NXREQUESTBKGD;
+      goto errout_with_nx;
+    }
+
+  /* Wait until we have the screen resolution.  We'll have this immediately
+   * unless we are dealing with the NX server.
+   */
+
+  while (!g_nxlines.havepos)
+    {
+      (void)sem_wait(&g_nxlines.sem);
+    }
+  message("nxlines_main: Screen resolution (%d,%d)\n", g_nxlines.xres, g_nxlines.yres);
+
+  /* Now, say perform the lines (these test does not return so the remaining
+   * logic is cosmetic). 
+   */
+
+  nxlines_test(g_nxlines.hbkgd);
+
+  /* Release background */
+
+  (void)nx_releasebkgd(g_nxlines.hbkgd);
+
+  /* Close NX */
+
+errout_with_nx:
+  message("nxlines_main: Close NX\n");
+  nx_close(g_nxlines.hnx);
+errout:
+  return g_nxlines.code;
+}