From 3f2d3721ded93048c8f8897a3c28e61852475e7e Mon Sep 17 00:00:00 2001
From: spew <devnull@localhost>
Date: Sun, 12 Mar 2017 18:33:54 -0500
Subject: games/galaxy: avoid unnecessary calculations It is not necessary to
 recalculate the center of the screen every time.

---
 sys/src/games/galaxy/galaxy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/src/games/galaxy/galaxy.c b/sys/src/games/galaxy/galaxy.c
index 8323e94da..57f9b7bbb 100644
--- a/sys/src/games/galaxy/galaxy.c
+++ b/sys/src/games/galaxy/galaxy.c
@@ -357,13 +357,13 @@ dozoom(void)
 	setcursor(mc, &zoomcursor);
 	oxy = mc->xy;
 	oscale = scale;
+	sc = screencenter();
 	for(;;) {
 		readmouse(mc);
 		if(mc->buttons != 2)
 			break;
 		d = subpt(mc->xy, oxy);
 		z = tanh((double)d.y/200) + 1;
-		sc = screencenter();
 		gsc = tovector(sc);
 		pause(0, 0);
 		scale = z*oscale;
-- 
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