Add circle drawing interfaces

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3910 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 114 insertions, 0 deletions

diff --git a/nuttx/graphics/nxmu/nx_fillcircle.c b/nuttx/graphics/nxmu/nx_fillcircle.c
new file mode 100644
index 000000000..dc4115782
--- /dev/null
+++ b/nuttx/graphics/nxmu/nx_fillcircle.c
@@ -0,0 +1,114 @@
+/****************************************************************************
+ * graphics/nxsu/nx_fillcircle.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 <debug.h>
+#include <errno.h>
+
+#include <nuttx/nx/nxglib.h>
+#include <nuttx/nx/nx.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+#define NCIRCLE_TRAPS 8
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nx_fillcircle
+ *
+ * Description:
+ *  Fill a circular region using the specified color.
+ *
+ * Input Parameters:
+ *   hwnd   - The window handle
+ *   center - A pointer to the point that is the center of the circle
+ *   radius - The radius of the circle in pixels.
+ *   color  - The color to use to fill the circle.
+ *
+ * Return:
+ *   OK on success; ERROR on failure with errno set appropriately
+ *
+ ****************************************************************************/
+
+int nx_fillcircle(NXWINDOW hwnd, FAR struct nxgl_point_s *center,
+                  nxgl_coord_t radius, nxgl_mxpixel_t color[CONFIG_NX_NPLANES])
+{
+  FAR struct nxgl_trapezoid_s traps[NCIRCLE_TRAPS];
+  int i;
+  int ret;
+
+  /* Describe the circular region as a sequence of 8 trapezoids */
+
+  nxgl_circletraps(center, radius, traps);
+
+  /* Then rend those trapezoids */
+
+  for (i = 0; i < NCIRCLE_TRAPS; i++)
+    {
+      ret = nx_filltrapezoid(hwnd, NULL, &traps[i], color);
+      if (ret != OK)
+        {
+          return ret;
+        }
+    }
+  return OK;
+}