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author | Mattias Andrée <maandree@kth.se> | 2023-02-05 09:31:10 +0100 |
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committer | Mattias Andrée <maandree@kth.se> | 2023-02-05 09:31:10 +0100 |
commit | bd0bed7feb76a87148fb62e4c3cd19c862a2b01f (patch) | |
tree | 52e6c7ddd5ee037cd157e5029494ea4200c08ee4 /rtgrpblib_draw_circular_arc.c | |
parent | First commit (diff) | |
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Add rtgrpblib_draw_circular_arc
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to 'rtgrpblib_draw_circular_arc.c')
-rw-r--r-- | rtgrpblib_draw_circular_arc.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/rtgrpblib_draw_circular_arc.c b/rtgrpblib_draw_circular_arc.c new file mode 100644 index 0000000..f30fde7 --- /dev/null +++ b/rtgrpblib_draw_circular_arc.c @@ -0,0 +1,48 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" +#ifndef TEST + + +void +rtgrpblib_draw_circular_arc(RASTER *restrict raster, double x0, double y0, + double semiwidth, double semiheight, double start, double end) +{ + double inc, v, x, y, prevX, prevY; + + if (start == end) + return; + + /* TODO precalculate intersection with raster box */ + + inc = fmax(semiwidth, semiheight); + inc *= 2 * M_PI; + inc *= end - start; + inc = raster->draftness / inc; + + v = start; + prevX = x0 + semiwidth * cos(start); + prevY = y0 + semiheight * sin(start); + + for (; (v += inc) < end; prevX = x, prevY = y) { + x = x0 + semiwidth * cos(v); + y = y0 + semiheight * sin(v); + rtgrpblib_draw_linear_bezier(raster, prevX, prevY, x, y); + } + + x = x0 + semiwidth * cos(end); + y = y0 + semiheight * sin(end); + rtgrpblib_draw_linear_bezier(raster, prevX, prevY, x, y); +} + + +#else + + +int +main(void) +{ + return 0; /* TODO add test */ +} + + +#endif |