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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 numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtWidgets
import pyqtgraph.parametertree as ptree
from time import perf_counter
import re
translate = QtCore.QCoreApplication.translate
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
lastTime = perf_counter()
fps = None
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", 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, fps
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, lastTime, fps
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
now = perf_counter()
dt = now - lastTime
lastTime = now
if fps is None:
fps = 1.0 / dt
else:
s = np.clip(dt * 3.0, 0, 1)
fps = fps * (1 - s) + (1.0 / dt) * s
p.setTitle("%0.2f fps" % fps)
p.repaint()
# app.processEvents() # force complete redraw for every plot
@interactor.decorate()
def pausePlot(paused=False):
if paused:
timer.stop()
else:
timer.start()
mkDataAndItem()
timer.timeout.connect(update)
timer.start(0)
if __name__ == "__main__":
pg.exec()
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