Hi,

Yeah, all that spacing/padding functionality is buried in the Qt 
QGraphicsWidget 
<https://doc.qt.io/qt-5/qgraphicswidget.html#setContentsMargins> and 
QGraphicsGridLayout <https://doc.qt.io/qt-5/qgraphicsgridlayout.html> 
subclasses of GraphicsWidget etc. Examples:
# ci is the central item (a GraphicsLayout) of a GraphicsLayoutWidget.
# Set column spacing between first and second plot
graphicslayoutwidget.ci.layout.setColumnSpacing(0, 100)
# Set left, top, right, bottom padding around edges of the layout
graphicslayoutwidget.ci.layout.setContentsMargins(100, 50, 200, 10)

Patrick

On Wednesday, 22 May 2019 23:44:12 UTC+9:30, JJ wrote:
>
> Hi Patrick,
> I've adjusted the z values and it helps. Do you have any idea about how to 
> adjust the padding of the viewbox?
> John
>
> On Wednesday, May 22, 2019 at 9:17:19 AM UTC+2, Patrick wrote:
>>
>> Hi,
>>
>> Yeah, I'm not sure if the z-orders are set correctly for everything. 
>> You'd think the background should be drawn behind the grid... Try something 
>> like:
>>  [ plotItem.getAxis(ax).setZValue(10) for ax in plotItem.axes ]
>> I think the grid lines are then over the top of the plot lines, you may 
>> need to play with the "10" if that's a problem. (Note this is the answer to 
>> getting grid lines over the top of an imageItem as well...)
>>
>> Patrick
>>
>> On Wednesday, 22 May 2019 16:08:13 UTC+9:30, JJ wrote:
>>>
>>> Hi Patrick,
>>> Thanks, this appears to work. However, the grid lines disappear. Do you 
>>> have any idea on how to prevent the setting of the background color from 
>>> drawing over the grid lines?
>>>
>>>
>>> On Wednesday, May 22, 2019 at 8:16:38 AM UTC+2, Patrick wrote:
>>>>
>>>> Hi,
>>>>
>>>> I think you want the setBackgroundColor method from ViewBox. So get the 
>>>> ViewBox associated with your PlotItem like:
>>>> plotItem.getViewBox().setBackgroundColor((192, 192, 192))
>>>>
>>>> Patrick
>>>>
>>>> On Wednesday, 22 May 2019 04:25:44 UTC+9:30, JJ wrote:
>>>>>
>>>>> By default the plot background color is black. However, this color 
>>>>> extends into the area of the axis and padding between the plot area and 
>>>>> window edges.
>>>>> What I would like to do is change the color and padding of the plot 
>>>>> frame area while leaving the plot area itself black or grey. How is this 
>>>>> possible?
>>>>>
>>>>> A good example can be seen here: 
>>>>> https://bokeh.pydata.org/en/latest/docs/gallery/ridgeplot.html
>>>>>
>>>>>
>>>>>
>>>>>

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