From 484d84596ef059463d905f07c65672b92a38a28c Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 11 Jul 2017 19:18:56 +0200 Subject: blind-spiral-gradient: set the value of the singularity to 0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/blind-spiral-gradient.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) (limited to 'src') 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 {\ -- cgit v1.2.3-70-g09d2