From: Armaan Bhojwani <me@armaanb.net>
Date: Sat, 15 May 2021 22:37:24 +0000 (-0400)
Subject: Randomize direction of index
X-Git-Url: https://git.armaanb.net/?p=pong.git;a=commitdiff_plain;h=94ec7464b5639e49cd93ee1a7a6787526f0263bd

Randomize direction of index
---

diff --git a/Makefile b/Makefile
index a234c45..d07d5ec 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 all:
 	${CC} -o pong pong.c ${CLAGS} -Wall -Wextra -std=c99 -pedantic \
-		-lcurses ${LDFLAGS}
+		-lcurses -lm ${LDFLAGS}
 	scdoc < pong.1.scd > pong.1
 
 install: all
diff --git a/pong.c b/pong.c
index 717b1ae..1363ae5 100644
--- a/pong.c
+++ b/pong.c
@@ -4,6 +4,7 @@
 #include <unistd.h>
 #include <sys/time.h>
 #include <time.h>
+#include <math.h>
 
 int
 die(int code)
@@ -20,6 +21,12 @@ randslope(void)
 	return (rand() % (high - low + 1)) + low;
 }
 
+int
+randsign(void)
+{
+	return pow(-1, rand());
+}
+
 int
 main(void) {
 	srand((unsigned int)time(NULL));
@@ -29,7 +36,7 @@ main(void) {
 	int pad_h = 5;
 	int a_score = 0, b_score = 0;
 	int slope_x = randslope();
-	int index_dir = 1;
+	int index_dir = randsign();
 	int direction = 1;
 	double speed = 0.02;
 	struct timeval start, stop;
@@ -126,6 +133,7 @@ main(void) {
 			x = max_x/2;
 			index = slope_x*max_y/2;
 			slope_x = randslope();
+			index_dir = randsign();
 			speed = 0.02;
 			sleep(1);
 		} else if (y == 0 || y == max_y) {