after fetching, data must be reduced to at least chart resolution, else some data...

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2@2221 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/rrd_graph.c b/program/src/rrd_graph.c
index 45218bc0b722093a1c54f369e0de2c23d55c3360..dbd8b3e9ce4b7bc7b2e69af0c9dc4de7b3002575 100644 (file)
--- a/program/src/rrd_graph.c
+++ b/program/src/rrd_graph.c
@@ -744,7 +744,12 @@ data_fetch(image_desc_t *im )
                 return -1;
             }
             im->gdes[i].data_first = 1;            
-        
+
+            /* must reduce to at least im->step
+               otherwhise we end up with more data than we can handle in the 
+               chart and visibility of data will be random */            
+            im->gdes[i].step = max(im->gdes[i].step,im->step);
+       
             if (ft_step < im->gdes[i].step) {
                 reduce_data(im->gdes[i].cf_reduce,
                             ft_step,