Hi, I started building a plugin for QGIS using PyQtGraph, as it is much
quicker than MatPlotLib, and it is modeled around a scenegraph, which suits
me fine.
I need to do a lot of custom drawing, so my code is built around the
customGraphicsItem.py example.
My graphics class starts as follows:
class RollSurvey(pg.GraphicsObject):
def __init__(self, name: str = 'Untitled')-> None:
# assign default name value
pg.GraphicsObject.__init__(self)
etc...
To keep the paint effort manageable, I am using four different
levels-of-detail (LOD) similar to the Qt 40000-chips example found here
<https://github.com/mootterry/chip40000-python>.
Here's my problem; in order to keep the plotting responsive when the user
is *panning *the plot, I need to step back by (at least) one
level-of-detail. But I have not been able to properly capture the *mouse-down
*status, in order to reduce drawing effort whilst panning. The event
sequence that I observe is :
QEvent::WindowActivate
QEvent::GrabMouse
QEvent::GraphicsSceneMousePress
QEvent::UngrabMouse
Painting - Mouse grabbed: False
Painting - Mouse grabbed: False
Painting - Mouse grabbed: False
Painting - Mouse grabbed: False
Painting - Mouse grabbed: False
I set the mouseGrabbed = True condition when the "GrabMouse" event occurs
and reset it at "UngrabMouse".
What I do not understand is that the mouse is already "ungrabbed" before
painting starts...
Any suggestions what I am doing wrong / overlooking here ?
Thanks very much.
--
You received this message because you are subscribed to the Google Groups
"pyqtgraph" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/pyqtgraph/9e2d8413-305e-4ccd-ac1f-5698978e9f70n%40googlegroups.com.
