We've encountered something similar with our version of InfiniteLine which
we haven't ironed out. A first thing you can try is to redefine your
"shape" method to something like....
def shape(self)
p = self.path
p.addRect(self.boundingRect())
return p
For debugging purposes, you may want to draw the boundingRect around the
line to see if the rectangle has some 0-thickness making it impossible to
register mouse events.
On Sun, Jul 10, 2022 at 11:00 AM 你你 <[email protected]> wrote:
> Hi, I implemented a LineItem class finally inheriting QGraphicsPathItem,
> to draw a simple line by specifying a start point and an end point. It
> works fine only there's a problem regarding mouse hover. It's really
> strange that when I draw a horizontal line, no matter how I tried the mouse
> hover or mouse click, there will be no hoverEnterEvent nor
> mouseClickEvent triggered. However, if I draw a line that's not horizontal,
> both the hoverEnterEvent and mouseClickEvent will be triggered. My code's
> shown below, does anyone know what's going on here, what else do I need to
> add to my code ? Many thanks! [image: lines.png]
>
> class LineItem(GraphicsPathItem,QtCore.QObject):
> sigHoveredEnter = QtCore.Signal(object, object,object)
> sigHoveredLeave = QtCore.Signal(object, object)
> sigClicked = QtCore.Signal(object, object)
> def __init__(self,start=None, end=None, data = None, parent=None,
> **opts) -> None:
> self._start = start
> self._end = end
> self.data = data
> QtCore.QObject.__init__(self)
> GraphicsPathItem.__init__(self, parent, **opts)
> self.setAcceptHoverEvents(True)
>
> def hoverEnterEvent(self, ev):
> self.sigHoveredEnter.emit(self, ev, self.data)
> logger.debug('line Enter')
>
> def makePath(self):
> path = QtGui.QPainterPath()
> path.moveTo(*self._start)
> path.lineTo(*self._end)
> return path
>
> def mouseClickEvent(self, ev):
> self.sigClicked.emit(self, ev, self.data)
> logger.debug('line clicked.')
>
>
> class GraphicsPathItem(QtGui.QGraphicsPathItem):
> __metaclass__ = ABCMeta
> def __init__(self, parent=None, **opts) -> None:
> self.opts = {}
> QtGui.QGraphicsPathItem.__init__(self, parent)
> defaultOpts = {
> 'pxMode': False,
> 'pen': (200,200,200),
> 'brush': (190, 190, 190),
> }
> defaultOpts.update(opts)
>
> self.setStyle(**defaultOpts)
>
> def setStyle(self, **opts):
> needUpdate = False
> for k,v in opts.items():
> if self.opts.get(k) != v:
> needUpdate = True
> self.opts[k] = v
>
> if not needUpdate:
> return
>
> tr = QtGui.QTransform()
> self.path = tr.map(self.makePath())
>
> self.setPath(self.path)
>
> self.setPen(fn.mkPen(self.opts['pen']))
> self.setBrush(fn.mkBrush(self.opts['brush']))
>
> if self.opts['pxMode']:
> self.setFlags(self.flags() |
> self.GraphicsItemFlag.ItemIgnoresTransformations)
> else:
> self.setFlags(self.flags() &
> ~self.GraphicsItemFlag.ItemIgnoresTransformations)
>
> @abstractmethod
> def makePath(self):
> pass
>
> def paint(self, p, *args):
> p.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing)
> super().paint(p, *args)
>
> def shape(self):
> return self.path
>
> def dataBounds(self, ax, frac, orthoRange=None):
> pw = 0
> pen = self.pen()
> if not pen.isCosmetic():
> pw = pen.width() * 0.7072
> if self.opts['pxMode']:
> return [0,0]
> else:
> br = self.boundingRect()
> if ax == 0:
> return [br.left()-pw, br.right()+pw]
> else:
> return [br.top()-pw, br.bottom()+pw]
>
> def pixelPadding(self):
> pad = 0
> if self.opts['pxMode']:
> br = self.boundingRect()
> pad += hypot(br.width(), br.height())
> pen = self.pen()
> if pen.isCosmetic():
> pad += max(1, pen.width()) * 0.7072
> return pad
>
> --
> 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/a9da8789-a777-40be-b98f-1510c9c65400n%40googlegroups.com
> <https://groups.google.com/d/msgid/pyqtgraph/a9da8789-a777-40be-b98f-1510c9c65400n%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
--
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/CA%2BnduTF_5-Lt1qjCXhMBuS-_58jna_oHQYdFjaABT2XozPueWg%40mail.gmail.com.
