Hi all,
I've been trying to build a point cloud visualization where the user may
hover, click, or draw a box over points in a 3D scatter plot to highlight
them. I don't know if there exists any built-in functionality for this. I
found another similar post from 2016 in this group using an older version
of pyqtgraph, but I had difficulties getting that solution to run, so I
figured I'd bring up the issue again.
Here's my code. Right now it only aims to allow the user to click on a
point and change its color to green, but the problem is I am using
GLViewWidget's itemsAt method to return the GLScatterPlotItem, but it does
not distinguish the particular point my mouse clicked, therefore all points
turn green. Is there a short and sweet solution already out there?
import numpy as np
import pyqtgraph as pg
import pyqtgraph.opengl as gl
app = pg.mkQApp("GLScatterPlotItem Example")
class MyView(gl.GLViewWidget):
def __init__(self):
super().__init__()
def mousePressEvent(self, e):
super().mousePressEvent(e)
items = w.itemsAt((e.pos().x()-5, e.pos().y()-5, 10, 10))
if len(items) == 0:
return
print(items)
for item in items:
if type(item) == gl.GLScatterPlotItem:
item.setData(color = (0,1,0,0.5))
e.accept()
w = MyView()
w.show()
w.setCameraPosition(distance=10)
n = 100
pos = np.random.normal(0,1,(n,3))
size = 0.25*np.ones((n,))
color = np.ones((n,4))
color[:,-1] = 0.5
sp = gl.GLScatterPlotItem(pos=pos, size=size, color=color, pxMode=False)
w.addItem(sp)
if __name__ == '__main__':
pg.exec()
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