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#!/usr/bin/python
"""
For testing rapid updates of ScatterPlotItem under various conditions.
(Scatter plots are still rather slow to draw; expect about 20fps)
"""
import argparse
import itertools
import re
import numpy as np
from utils import FrameCounter
import pyqtgraph as pg
import pyqtgraph.parametertree as ptree
from pyqtgraph.Qt import QtCore, QtWidgets
translate = QtCore.QCoreApplication.translate
parser = argparse.ArgumentParser()
parser.add_argument('--iterations', default=float('inf'), type=float,
help="Number of iterations to run before exiting"
)
args = parser.parse_args()
iterations_counter = itertools.count()
app = pg.mkQApp()
pt = ptree.ParameterTree(showHeader=False)
param = ptree.Parameter.create(name=translate("ScatterPlot", "Parameters"), type="group")
pt.setParameters(param)
p = pg.PlotWidget()
splitter = QtWidgets.QSplitter()
splitter.addWidget(pt)
splitter.addWidget(p)
splitter.setSizes([300, p.width()])
splitter.show()
data = {}
item = pg.ScatterPlotItem()
hoverBrush = pg.mkBrush("y")
ptr = 0
timer = QtCore.QTimer()
def fmt(name):
replace = r"\1 \2"
name = re.sub(r"(\w)([A-Z])", replace, name)
name = name.replace("_", " ")
return translate("ScatterPlot", f"{name.title().strip()}: ")
interactor = ptree.Interactor(
titleFormat=fmt, nest=False, parent=param, runOptions=ptree.RunOptions.ON_CHANGED
)
@interactor.decorate(
count=dict(limits=[1, None], step=100),
size=dict(limits=[1, None]),
)
def mkDataAndItem(count=500, size=10):
global data
scale = 100
data = {
"pos": np.random.normal(size=(50, count), scale=scale),
"pen": [pg.mkPen(x) for x in np.random.randint(0, 256, (count, 3))],
"brush": [pg.mkBrush(x) for x in np.random.randint(0, 256, (count, 3))],
"size": (np.random.random(count) * size).astype(int),
}
data["pen"][0] = pg.mkPen("w")
data["size"][0] = size
data["brush"][0] = pg.mkBrush("b")
bound = 5 * scale
p.setRange(xRange=[-bound, bound], yRange=[-bound, bound])
mkItem()
@interactor.decorate()
def mkItem(pxMode=True, useCache=True):
global item
item = pg.ScatterPlotItem(pxMode=pxMode, **getData())
item.opts["useCache"] = useCache
p.clear()
p.addItem(item)
@interactor.decorate()
def getData(randomize=False):
pos = data["pos"]
pen = data["pen"]
size = data["size"]
brush = data["brush"]
if not randomize:
pen = pen[0]
size = size[0]
brush = brush[0]
return dict(x=pos[ptr % 50], y=pos[(ptr + 1) % 50], pen=pen, brush=brush, size=size)
@interactor.decorate(
mode=dict(
type="list",
limits=["New Item", "Reuse Item", "Simulate Pan/Zoom", "Simulate Hover"],
),
)
def update(mode="Reuse Item"):
global ptr
if next(iterations_counter) > args.iterations:
timer.stop()
app.quit()
return None
if mode == "New Item":
mkItem()
elif mode == "Reuse Item":
item.setData(**getData())
elif mode == "Simulate Pan/Zoom":
item.viewTransformChanged()
item.update()
elif mode == "Simulate Hover":
pts = item.points()
old = pts[(ptr - 1) % len(pts)]
new = pts[ptr % len(pts)]
item.pointsAt(new.pos())
old.resetBrush() # reset old's brush before setting new's to better simulate hovering
new.setBrush(hoverBrush)
ptr += 1
framecnt.update()
@interactor.decorate()
def pausePlot(paused=False):
if paused:
timer.stop()
else:
timer.start()
mkDataAndItem()
timer.timeout.connect(update)
timer.start(0)
framecnt = FrameCounter()
framecnt.sigFpsUpdate.connect(lambda fps : p.setTitle(f'{fps:.1f} fps'))
if __name__ == "__main__":
pg.exec()
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