blind

commit 484d84596ef059463d905f07c65672b92a38a28c
parent 862b01e204b651cb20fd7aae9caad470e86a11ca
Author: Mattias Andrée <maandree@kth.se>
Date:   Tue, 11 Jul 2017 19:18:56 +0200

blind-spiral-gradient: set the value of the singularity to 0

Signed-off-by: Mattias Andrée <maandree@kth.se>

Diffstat:
M
src/blind-spiral-gradient.c
 | 
16
++++++++++------

1 file changed, 10 insertions(+), 6 deletions(-)
diff --git 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 {\