87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/****************************************************************************
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* libs/libnx/nx/nx_fillcircle.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/nx.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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_fillcircle
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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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* hwnd - The window handle
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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 nx_fillcircle(NXWINDOW hwnd,
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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 = nx_filltrapezoid(hwnd, NULL, &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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