diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/blind-spiral-gradient.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/blind-spiral-gradient.c b/src/blind-spiral-gradient.c index 4cf5937..5d80bef 100644 --- a/src/blind-spiral-gradient.c +++ b/src/blind-spiral-gradient.c @@ -1,10 +1,11 @@ /* See LICENSE file for copyright and license details. */ #include "common.h" -USAGE("[-al] -w width -h height") +USAGE("[-s spirals] [-al] -w width -h height") static int anticlockwise = 0; static int logarithmic = 0; +static double spirals = 1; static size_t width = 0; static size_t height = 0; static int with_params; @@ -58,6 +59,7 @@ static int with_vector; y2 -= y1;\ u = atan2(y2, x2);\ b = sqrt(x2 * x2 + y2 * y2);\ + b *= spirals;\ if (logarithmic)\ b = log(b);\ b /= pow(2 * (TYPE)M_PI, e);\ @@ -96,6 +98,7 @@ static int with_vector; r = pow(r / b, ep);\ r = (r - v) / (2 * (TYPE)M_PI);\ }\ + r = mod(r, 1 / (TYPE)spirals) * (TYPE)spirals + r - mod(r, (TYPE)1);\ buf[ptr][0] = buf[ptr][1] = buf[ptr][2] = buf[ptr][3] = r;\ if (++ptr == ELEMENTSOF(buf)) {\ ewriteall(STDOUT_FILENO, buf, sizeof(buf), "<stdout>");\ @@ -123,6 +126,11 @@ main(int argc, char *argv[]) case 'l': logarithmic = 1; break; + case 's': + spirals = etolf_flag('s', UARGF()); + if (!spirals) + eprintf("the value of -s must not be 0"); + break; case 'w': width = etozu_flag('w', UARGF(), 1, SIZE_MAX); break; |