pybootchartgui/draw.py: fix drawing of samples not starting at zero

The code did not handle x scaling correctly when drawing starts at
some time larger than zero, i.e. it worked for normal bootchart data,
but not for the system statistics recorded by buildstats.bbclass.

(From OE-Core rev: 166f8f9aaa1f01fc6d6a5451f8f06b815c51ffae)

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/pybootchartgui/pybootchartgui/draw.py b/scripts/pybootchartgui/pybootchartgui/draw.py
index 2b5907be19..925002d6e8 100644
--- a/scripts/pybootchartgui/pybootchartgui/draw.py
+++ b/scripts/pybootchartgui/pybootchartgui/draw.py
@@ -256,7 +256,7 @@ def draw_chart(ctx, color, fill, chart_bounds, data, proc_tree, data_range):
         # avoid divide by zero
         if max_y == 0:
                 max_y = 1.0
-        xscale = float (chart_bounds[2]) / max_x
+        xscale = float (chart_bounds[2]) / (max_x - x_shift)
         # If data_range is given, scale the chart so that the value range in
         # data_range matches the chart bounds exactly.
         # Otherwise, scale so that the actual data matches the chart bounds.