diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/blind-spiral-gradient.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/src/blind-spiral-gradient.c b/src/blind-spiral-gradient.c index a248a02..8bdda44 100644 --- a/src/blind-spiral-gradient.c +++ b/src/blind-spiral-gradient.c @@ -66,12 +66,16 @@ static int with_vector; y = (TYPE)iy - y1;\ for (ix = 0; ix < width; ix++) {\ x = (TYPE)ix - x1;\ - v = atan2(y, x);\ - if (anticlockwise)\ - v = 1 - v;\ - v -= u;\ - v += 4 * (TYPE)M_PI;\ - v = mod(v, 2 * (TYPE)M_PI);\ + if (!x && !y) {\ + v = 0;\ + } else {\ + v = atan2(y, x);\ + if (anticlockwise)\ + v = 1 - v;\ + v -= u;\ + v += 4 * (TYPE)M_PI;\ + v = mod(v, 2 * (TYPE)M_PI);\ + }\ if (!with_vector) {\ r = sqrt(x * x + y * y);\ } else {\ |