[gnome-continuous-yocto/gnomeostree-3.28-rocko: 3538/8267] pybootchartgui/draw.py: fix drawing of samples not starting at zero

[Emmanuele Bassi <ebassi src gnome org>]

commit a2c20921956bac82ba8df5e36243e9706639a4b2
Author: Patrick Ohly <patrick ohly intel com>
Date:   Wed Nov 30 10:50:03 2016 +0100

    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>

 scripts/pybootchartgui/pybootchartgui/draw.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/scripts/pybootchartgui/pybootchartgui/draw.py b/scripts/pybootchartgui/pybootchartgui/draw.py
index 2b5907b..925002d 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.