From ce3318404a44f39fc51c951643e18caa734c386d Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Wed, 5 Apr 2017 16:01:17 +0200
Subject: Make exponent an optional command-line param

---
 attract.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/attract.c b/attract.c
index 47f4a42..66fbee4 100644
--- a/attract.c
+++ b/attract.c
@@ -119,13 +119,18 @@ static void* thread_entry(void *arg_vp){
 	pthread_exit(NULL);
 }
 
-int main(void){
+int main(int argc,char **argv){
 	struct config cfg={
 		.unitsz=200,
 		.width=500, .height=500,
 		.exponent=8.5
 	};
 
+	assert(argc==1||argc==2);
+	if(argc==2){
+		cfg.exponent=strtod(argv[1],NULL);
+	}
+
 	unsigned char img[cfg.width*cfg.height*3];
 
 	int nthreads=sysconf(_SC_NPROCESSORS_ONLN);
-- 
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