117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/****************************************************************************
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* libs/libnx/nxtk/nxtk_fillcirclewindow.c
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*
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* Copyright (C) 2011 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 <sys/types.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/nx/nxglib.h>
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#include <nuttx/nx/nxtk.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NCIRCLE_TRAPS 8
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxtk_fillcirclewindow
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*
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* Description:
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* Fill a circular region using the specified color.
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*
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* Input Parameters:
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* hfwnd - The window handle returned by nxtk_openwindow()
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* center - A pointer to the point that is the center of the circle
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* radius - The radius of the circle in pixels.
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* color - The color to use to fill the circle.
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*
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* Returned Value:
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* OK on success; ERROR on failure with errno set appropriately
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*
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****************************************************************************/
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int nxtk_fillcirclewindow(NXWINDOW hfwnd, FAR const struct nxgl_point_s *center,
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nxgl_coord_t radius,
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nxgl_mxpixel_t color[CONFIG_NX_NPLANES])
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{
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FAR struct nxgl_trapezoid_s traps[NCIRCLE_TRAPS];
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int i;
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int ret;
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/* Describe the circular region as a sequence of 8 trapezoids */
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nxgl_circletraps(center, radius, traps);
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/* Then rend those trapezoids */
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for (i = 0; i < NCIRCLE_TRAPS; i++)
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{
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ret = nxtk_filltrapwindow(hfwnd, &traps[i], color);
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if (ret != OK)
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{
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return ret;
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}
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}
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return OK;
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}
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