in logarithmic mode minval must not be <= 0

[rrdtool.git] / src / rrd_graph.c

diff --git a/src/rrd_graph.c b/src/rrd_graph.c
index cd5bdfc..ecf19fd 100644 (file)
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -1062,8 +1062,9 @@ data_proc( image_desc_t *im ){
                        ** relevant for min and max
                        */
                        if (finite(paintval) && im->gdes[ii].gf != GF_TICK ) {
-                           if (isnan(minval) || paintval <  minval)
-                               minval = paintval;
+                           if ((isnan(minval) || paintval <  minval ) &&
+                             ! (im->logarithmic && paintval <= 0.0)) 
+                                       minval = paintval;
                            if (isnan(maxval) || paintval >  maxval)
                                maxval = paintval;
                        }