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- /****************************************************************************
- * graphics/nxtk/nxtk_drawcirclewindow.c
- *
- * Copyright (C) 2011 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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/nxtk.h>
- /****************************************************************************
- * Pre-Processor Definitions
- ****************************************************************************/
- /* Named indices into the 16 circle points generated by nxgl_circlepts */
- #define POINT_0p0 0
- #define POINT_22p5 1
- #define POINT_45p0 2
- #define POINT_67p5 3
- #define POINT_90p0 4
- #define POINT_112p5 5
- #define POINT_135p0 6
- #define POINT_157p5 7
- #define POINT_180p0 8
- #define POINT_202p5 9
- #define POINT_225p0 10
- #define POINT_247p5 11
- #define POINT_270p0 12
- #define POINT_292p5 13
- #define POINT_315p0 14
- #define POINT_337p5 15
- #define NCIRCLE_POINTS 16
- /****************************************************************************
- * Private Types
- ****************************************************************************/
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- /****************************************************************************
- * Public Data
- ****************************************************************************/
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxtk_drawcirclewindow
- *
- * Description:
- * Draw a circular outline using the specified line thickness and 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.
- * width - The width of the line
- * color - The color to use to fill the line
- *
- * Return:
- * OK on success; ERROR on failure with errno set appropriately
- *
- ****************************************************************************/
- int nxtk_drawcirclewindow(NXTKWINDOW hfwnd, FAR const struct nxgl_point_s *center,
- nxgl_coord_t radius, nxgl_coord_t width,
- nxgl_mxpixel_t color[CONFIG_NX_NPLANES])
- {
- struct nxgl_point_s pts[NCIRCLE_POINTS];
- FAR struct nxgl_vector_s vector;
- int i;
- int ret;
- /* Convert the circle to a set of 16 points */
- nxgl_circlepts(center, radius, pts);
- /* Draw each pair of points as a vector */
- for (i = POINT_0p0; i < POINT_337p5; i++)
- {
- vector.pt1.x = pts[i].x;
- vector.pt1.y = pts[i].y;
- vector.pt2.x = pts[i+1].x;
- vector.pt2.y = pts[i+1].y;
- ret = nxtk_drawlinewindow(hfwnd, &vector, width, color);
- if (ret != OK)
- {
- return ret;
- }
- }
- /* The final, closing vector is a special case */
- vector.pt1.x = pts[POINT_337p5].x;
- vector.pt1.y = pts[POINT_337p5].y;
- vector.pt2.x = pts[POINT_0p0].x;
- vector.pt2.y = pts[POINT_0p0].y;
- return nxtk_drawlinewindow(hfwnd, &vector, width, color);
- }
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