Thank you Luke, this does mostly work.
However, I understand that to position an item (like text) relative to,
say, the lower-right corner of the visible widget, requires tampering with
an event handler? Or a signal slot?
On Tuesday, May 15, 2018 at 11:16:31 PM UTC+2, Luke Campagnola wrote:
>
> No need to do any manual painting. To be more specific:
>
> 1. Use arrayToQPath to generate a QPainterPath object (this describes just
> the coordinates of lines in the path)
> 2. Create a QGraphicsPathItem using the QPainterPath as its input
> 3. Add the QGraphicsPathItem to the ViewBox or PlotItem
> 4. Probably you will also need to set the pen/brush on the
> QGraphicsPathItem
>
> Text can be added anywhere in much the same way, with QGraphicsTextItem.
> The important thing here, though, is that you do not want to add the text
> into the viewbox like you did with the path (because you don't want the
> text to scale/translate with the view). Instead, make the ViewBox or
> PlotItem the *parent* of the text item. For example:
>
> plt = pg.plot()
> text = pg.QtGui.QGraphicsTextItem("Hello")
> text.setDefaultTextColor(pg.mkColor('w'))
> text.setParentItem(plt.plotItem) # this is not the same as
> plt.plotItem.addItem(text)
>
>
>
> On Mon, May 14, 2018 at 8:55 AM, Robert Budzyński <[email protected]
> <javascript:>> wrote:
>
>>
>>
>> On Saturday, May 12, 2018 at 7:28:02 PM UTC+2, Luke Campagnola wrote:
>>>
>>> Qt provides several lower-level drawing primitives. In this case, you
>>> probably want QGraphicsPathItem:
>>> http://doc.qt.io/archives/qt-4.8/qgraphicspathitem.html
>>>
>>> You could also use pg.arrayToQPath to generate the QPath:
>>> http://www.pyqtgraph.org/documentation/functions.html#pyqtgraph.arrayToQPath
>>>
>>>
>>>
>> More specifically, this QPainterPath should be painted on some QWidget,
>> and I can't figure out which. My guess was the ViewBox, but I get:
>>
>> TypeError: arguments did not match any overloaded call:
>> QPainter(): too many arguments
>> QPainter(QPaintDevice): argument 1 has unexpected type 'ViewBox'
>>
>>
>>
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