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games/galaxy: avoid unnecessary calculations

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It is not necessary to recalculate the center of the
screen every time.
This commit is contained in:
spew 2017-03-12 18:33:54 -05:00
parent dff1e3813f
commit 3f2d3721de
1 changed files with 1 additions and 1 deletions
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2
sys/src/games/galaxy/galaxy.c
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@ -357,13 +357,13 @@ dozoom(void)
setcursor(mc, &zoomcursor); setcursor(mc, &zoomcursor);
oxy = mc->xy; oxy = mc->xy;
oscale = scale; oscale = scale;
sc = screencenter();
for(;;) { for(;;) {
readmouse(mc); readmouse(mc);
if(mc->buttons != 2) if(mc->buttons != 2)
break; break;
d = subpt(mc->xy, oxy); d = subpt(mc->xy, oxy);
z = tanh((double)d.y/200) + 1; z = tanh((double)d.y/200) + 1;
sc = screencenter();
gsc = tovector(sc); gsc = tovector(sc);
pause(0, 0); pause(0, 0);
scale = z*oscale; scale = z*oscale;