diff options
Diffstat (limited to 'nuttx/graphics/nxsu/nx_drawcircle.c')
-rw-r--r-- | nuttx/graphics/nxsu/nx_drawcircle.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/nuttx/graphics/nxsu/nx_drawcircle.c b/nuttx/graphics/nxsu/nx_drawcircle.c new file mode 100644 index 000000000..8d5c12454 --- /dev/null +++ b/nuttx/graphics/nxsu/nx_drawcircle.c @@ -0,0 +1,145 @@ +/**************************************************************************** + * graphics/nxsu/nx_drawcircle.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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/nx.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: nx_drawcircle + * + * Description: + * Draw a circular outline using the specified line thickness and color. + * + * Input Parameters: + * hwnd - The window handle + * 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 nx_drawcircle(NXWINDOW hwnd, 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 = nx_drawline(hwnd, &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 nx_drawline(hwnd, &vector, width, color); +} |