nuttx/libs/libnx/nxtk/nxtk_fillcircletoolbar.c

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/****************************************************************************
* libs/libnx/nxtk/nxtk_fillcircletoolbar.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 <sys/types.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/nx/nxglib.h>
#include <nuttx/nx/nxtk.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define NCIRCLE_TRAPS 8
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxtk_fillcircletoolbar
*
* Description:
* Fill a circular region using the specified color.
*
* Input Parameters:
* hfwnd - The window handle returned by nxtk_openwindow()
* 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.
*
* Returned Value:
* OK on success; ERROR on failure with errno set appropriately
*
****************************************************************************/
int nxtk_fillcircletoolbar(NXWINDOW hfwnd, FAR const 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 = nxtk_filltraptoolbar(hfwnd, &traps[i], color);
if (ret != OK)
{
return ret;
}
}
return OK;
}