From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Tue, 1 May 2007 20:40:15 +0000 (+0000)
Subject: if the graph goes 'down' minval must be hanged instead
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=7b87bd32ffe294dc4fd3ba4f65be49d7290311ee;p=rrdtool.git

if the graph goes 'down' minval must be hanged instead


git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2/program@1041 a5681a0c-68f1-0310-ab6d-d61299d08faa
---

diff --git a/src/rrd_graph.c b/src/rrd_graph.c
index e16e5d8..7e607bb 100644
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -497,7 +497,10 @@ apply_gridfit(image_desc_t *im)
     double new_range = factor * (im->maxval - im->minval);
     double gridstep = im->ygrid_scale.gridstep;
     double minor_y, minor_y_px, minor_y_px_frac;
-    im->maxval = im->minval + new_range;
+    if (im->maxval > 0.0)
+      im->maxval = im->minval + new_range;
+    else
+      im->minval = im->maxval - new_range;
     ytr(im,DNAN); /* reset precalc */
     /* make sure first minor gridline is on integer pixel y coord */
     minor_y = gridstep * floor(im->minval / gridstep);