119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/****************************************************************************
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* libs/libnx/nx/nx_drawcircle.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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/* Named indices into the 16 circle points generated by nxgl_circlepts */
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#define POINT_0p0 0
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#define POINT_22p5 1
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#define POINT_45p0 2
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#define POINT_67p5 3
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#define POINT_90p0 4
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#define POINT_112p5 5
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#define POINT_135p0 6
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#define POINT_157p5 7
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#define POINT_180p0 8
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#define POINT_202p5 9
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#define POINT_225p0 10
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#define POINT_247p5 11
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#define POINT_270p0 12
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#define POINT_292p5 13
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#define POINT_315p0 14
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#define POINT_337p5 15
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#define NCIRCLE_POINTS 16
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_drawcircle
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*
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* Description:
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* Draw a circular outline using the specified line thickness and 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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* width - The width of the line
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* color - The color to use to fill the line
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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_drawcircle(NXWINDOW hwnd, FAR const struct nxgl_point_s *center,
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nxgl_coord_t radius, nxgl_coord_t width,
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nxgl_mxpixel_t color[CONFIG_NX_NPLANES])
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{
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struct nxgl_point_s pts[NCIRCLE_POINTS];
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FAR struct nxgl_vector_s vector;
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int i;
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int ret;
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/* Convert the circle to a set of 16 points */
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nxgl_circlepts(center, radius, pts);
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/* Draw each pair of points as a vector */
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for (i = POINT_0p0; i < POINT_337p5; i++)
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{
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/* Draw one line segment */
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vector.pt1.x = pts[i].x;
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vector.pt1.y = pts[i].y;
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vector.pt2.x = pts[i + 1].x;
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vector.pt2.y = pts[i + 1].y;
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ret = nx_drawline(hwnd, &vector, width, color, NX_LINECAP_PT1);
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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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/* The final, closing vector is a special case */
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vector.pt1.x = pts[POINT_337p5].x;
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vector.pt1.y = pts[POINT_337p5].y;
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vector.pt2.x = pts[POINT_0p0].x;
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vector.pt2.y = pts[POINT_0p0].y;
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return nx_drawline(hwnd, &vector, width, color, NX_LINECAP_PT1);
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}
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