Fix y-invert

1 files changed, 1 insertions, 1 deletions

diff --git a/attract.c b/attract.c
index 838ad76..87ca6a1 100644
--- a/attract.c
+++ b/attract.c
@@ -80,7 +80,7 @@ static void* thread_entry(void *arg_vp){
 		for(int ix=0;ix<cfg.width;ix++){
 			const double complex start=CMPLX(
 					(double)(ix-cfg.width/2)/cfg.unitsz+cfg.midx,
-					(double)(iy-cfg.height/2)/cfg.unitsz+cfg.midy);
+					cfg.midy-(double)(iy-cfg.height/2)/cfg.unitsz);
 			double complex z=start;
 			for(int i=0;i<MAXITER;i++){
 				z=att_func(z,cfg.exponent);