It seems like adding in any custom GraphicItems to a plot breaks
autoranging in PyQTgraph, at least it seems to me.
I added an example below, even when the candlestick item is off to the side
of the plot and is not visible autorange still acts as though it is
onscreen.
Any ideas of the path to take to get it working ?
Thanks.
import pyqtgraph as pg
from pyqtgraph import QtCore, QtGui
## Create a subclass of GraphicsObject.
## The only required methods are paint() and boundingRect()
## (see QGraphicsItem documentation)
class CandlestickItem(pg.GraphicsObject):
def __init__(self, data):
pg.GraphicsObject.__init__(self)
self.data = data ## data must have fields: time, open, close, min,
max
self.generatePicture()
def generatePicture(self):
## pre-computing a QPicture object allows paint() to run much more
quickly,
## rather than re-drawing the shapes every time.
self.picture = QtGui.QPicture()
p = QtGui.QPainter(self.picture)
p.setPen(pg.mkPen('w'))
w = (self.data[1][0] - self.data[0][0]) / 3.
for (t, open, close, min, max) in self.data:
p.drawLine(QtCore.QPointF(t, min), QtCore.QPointF(t, max))
if open > close:
p.setBrush(pg.mkBrush('r'))
else:
p.setBrush(pg.mkBrush('g'))
p.drawRect(QtCore.QRectF(t-w, open, w*2, close-open))
p.end()
def paint(self, p, *args):
p.drawPicture(0, 0, self.picture)
def boundingRect(self):
## boundingRect _must_ indicate the entire area that will be drawn
on
## or else we will get artifacts and possibly crashing.
## (in this case, QPicture does all the work of computing the
bouning rect for us)
return QtCore.QRectF(self.picture.boundingRect())
# rescales Y automatically
def setYRange():
vb.enableAutoRange(x=False, y=True)
vb.setAutoVisible(x=False, y=True)
print('Why me no rescale ? =)')
data = [ ## fields are (time, open, close, min, max).
(1., 10, 13, 5, 15),
(2., 13, 17, 9, 20),
(3., 17, 14, 11, 23),
(4., 14, 15, 5, 19),
(5., 15, 9, 8, 22),
(6., 9, 15, 8, 16),
(7., 10, 13, 5, 15),
(8., 13, 17, 9, 20),
(9., 17, 14, 11, 23),
(10., 14, 15, 5, 19),
(11., 15, 9, 8, 22),
(12., 9, 15, 8, 16),
(13., 10, 13, 5, 15),
(14., 14, 15, 5, 19),
(15., 15, 9, 8, 22),
(16., 9, 15, 8, 16),
(17., 16, 17, 15, 20),
(18., 17, 21, 20, 23),
(19., 21, 30, 29, 24),
(20., 30, 39, 28, 32),
(21., 39, 37, 35, 40)
]
plt = pg.plot()
item = CandlestickItem(data)
plt.addItem(item)
plt.setWindowTitle('Scaletest')
# normal lines
import numpy
x_data = numpy.linspace(22, 122, num=100)
y_data = (10*numpy.random.rand(100,1)+30).flatten()
#y_data[5000:] = numpy.sin(x_data[5000:])
lineitem = pg.PlotDataItem(x_data, y_data)
plt.addItem(lineitem)
# autoscale aspects
vb = plt.getViewBox()
vb.setAspectLocked(lock=False)
vb.setAutoVisible(y=1.0)
vb.enableAutoRange(axis='y', enable=True)
# force it to update at rescale
vb.sigXRangeChanged.connect(setYRange)
## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
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