From 5aec66804d2a6d60aee8d973680c69b13c1d34a3 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 16 Mar 2012 10:17:08 +0100 Subject: [PATCH] graph: use 0 as the floor for the line graph Unless we have values below 0, in which case use that. This makes it easier to visually compare a running read/write workload. Without this change, the lowest valued graph would define the floor of the graph view. Signed-off-by: Jens Axboe --- graph.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/graph.c b/graph.c index 7dbfd357..837211da 100644 --- a/graph.c +++ b/graph.c @@ -525,6 +525,15 @@ void line_graph_draw(struct graph *g, cairo_t *cr) minx = find_xy_value(g, getx, mindouble); maxx = find_xy_value(g, getx, maxdouble); miny = find_xy_value(g, gety, mindouble); + + /* + * Start graphs at zero, unless we have a value below. Otherwise + * it's hard to visually compare the read and write graph, since + * the lowest valued one will be the floor of the graph view. + */ + if (miny > 0) + miny = 0; + maxy = find_xy_value(g, gety, maxdouble); if (fabs(maxx - minx) < 1e-20 || fabs(maxy - miny) < 1e-20) { -- 2.25.1