Attempt number 3: I almost have it doing what I want! I looked at what
PlotCurveItem does to make the curveClicked signal, and saw I had to make a
stroke path.
The *last* piece of the puzzle is how to inform the graphics handler that
my spot size extends a bit beyond the natural bounding rect. Does anyone
know of a way to make this happen? I.e. the programming logic works, but
the check for self.itemsNearEvent() in the graphics scene fails for a click
near the top-right shape.
import pyqtgraph as pg
from pyqtgraph.Qt import QtWidgets, QtCore, QtGui
import numpy as np
class CustScatter(pg.ScatterPlotItem):
def pointsAt(self, pos: QtCore.QPointF):
# if isinstance(pos, QtCore.QPointF):
# halfSz = 0.25
# pos = QtCore.QRectF(pos.x()-halfSz, pos.y()-halfSz, 2*halfSz,
2*halfSz)
pts = []
for spot in self.points(): # type: pg.SpotItem
symb = QtGui.QPainterPath(spot.symbol())
symb.translate(spot.pos())
stroker = QtGui.QPainterPathStroker()
mousePath = stroker.createStroke(symb)
if mousePath.contains(pos):
pts.append(spot)
return pts[::-1]
tri = np.array([[0,2.3,0,1,4,5,0], [0,4,4,8,8,3,0]]).T
tris = []
xyLocs = []
datas = []
for ii in np.arange(0, 16, 5):
curTri = tri + ii
tris.append(curTri)
xyLocs.append(curTri.min(0))
datas.append(ii)
def ptsClicked(item, pts):
print(f'ID {pts[0].data()} Clicked!')
def makeSymbol(verts: np.ndarray):
outSymbol = QtGui.QPainterPath()
symPath = pg.arrayToQPath(*verts.T)
outSymbol.addPath(symPath)
# From pyqtgraph.examples for plotting text
br = outSymbol.boundingRect()
tr = QtGui.QTransform()
tr.translate(-br.x(), -br.y())
outSymbol = tr.map(outSymbol)
return outSymbol
app = pg.mkQApp()
pg.setConfigOption('background', 'w')
symbs = []
for xyLoc, tri in zip(xyLocs, tris):
symbs.append(makeSymbol(tri))
xyLocs = np.vstack(xyLocs)
tri2 = pg.PlotDataItem()
scat = CustScatter(*xyLocs.T, symbol=symbs, data=datas, connect='finite',
pxMode=False, brush=None, pen=pg.mkPen(width=5), size=1)
scat.sigClicked.connect(ptsClicked)
# Now each 'point' is one of the triangles, hopefully
w = pg.PlotWindow()
w.plotItem.addItem(scat)
plt: pg.PlotItem = w.plotItem
plt.showGrid(True, True, 1)
w.show()
app.exec()
On Saturday, June 6, 2020 at 9:44:36 PM UTC-4, Nathan Jessurun wrote:
>
> Hi there,
>
> My overall goal is to have several clickable regions overlaid on an image,
> and if the plot boundary of any region is clicked I get a signal with the
> ID of that region. Something like this:
> I tried making each boundary a separate plot data item, but I have 1000s
> of bounds that update frequently so it lagged a ton. So, I just used
> connect='finite' within the same plot item to make it much faster.
>
> However, now I can't give a separate ID to each boundary. I have to make
> the vertices stand out, and connect to sigclicked(...pts) instead:
>
> This works, but I'd love to be able to click anywhere on one of the line
> segments for the same effect. Is there any way to make this happen?
>
> Relevant code is just a PlotDataItem on a plot widget.
>
> Thanks!
>
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