Hi,
I think the answer to your question is "no" unfortunately, but the
following does what you want. It isn't pretty though, so don't judge me!
It's a modification of the LegendItem demo, implementing a custom
ItemSample subclass to modify the legend marker.
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
# A custom ItemSample to draw in legend
from pyqtgraph.graphicsItems.LegendItem import ItemSample
from pyqtgraph.graphicsItems.ScatterPlotItem import drawSymbol
class MyItemSample(ItemSample):
def __init__(self, item):
super().__init__(item)
def paint(self, p, *args):
opts = self.item.opts
if opts.get('fillLevel',None) is not None and opts.get('fillBrush',
None) is not None:
p.setBrush(pg.mkBrush(opts['fillBrush']))
p.setPen(pg.mkPen(None))
p.drawPolygon(QtGui.QPolygonF([QtCore.QPointF(2,10), QtCore.
QPointF(18,10), QtCore.QPointF(18,18), QtCore.QPointF(2,18)]))
if not isinstance(self.item, pg.ScatterPlotItem):
p.setPen(pg.mkPen(opts['pen']))
p.drawLine(2, 10, 18, 10)
symbol = opts.get('symbol', None)
if symbol is not None:
if isinstance(self.item, pg.PlotDataItem):
opts = self.item.scatter.opts
pen = pg.mkPen(opts['pen'])
brush = pg.mkBrush(opts['brush'])
size = opts['size']
p.translate(10,10)
path = drawSymbol(p, symbol, size, pen, brush)
plt = pg.plot()
plt.setWindowTitle('pyqtgraph example: Legend')
#legend = plt.addLegend() # Don't use this, instead create and populate
legend manually
l = pg.LegendItem((100,60), offset=(70,30)) # args are (size, offset)
l.setParentItem(plt.graphicsItem()) # Note we do NOT call plt.addItem in
this case
# Crude patch of the legend paint() method
import types
def paint(self, p, *args):
p.fillRect(self.boundingRect(), pg.mkBrush(192,0,0,50))
l.paint = types.MethodType(paint, l)
# Fix the spacing between legend symbol and text.
# This is probably needs to be added to the __init__() of LegendItem...
l.layout.setHorizontalSpacing(20)
c1 = plt.plot([1,3,2,4], pen='r', symbol='o', symbolPen='r', symbolBrush=0.5
, name='red plot')
c2 = plt.plot([2,1,4,3], pen='g', fillLevel=0, fillBrush=(255,255,255,30),
name='green plot')
l.addItem(MyItemSample(c1), "my red plot")
l.addItem(MyItemSample(c2), "my green plot")
## 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_()
You might instead want to subclass LegendItem instead of just patching the
paint() method like that, and you could modify the addItem() method to use
your custom ItemSample by default.
Patrick
On Sunday, 21 April 2019 04:55:53 UTC+9:30, Jaime Heiss wrote:
>
> Hello.
> Is there any updated documentation about legend handling?
> I need to remove the box, change background color and make thicker lines
> as well as horizontal lines instead of the diagonals. If anybody could post
> an example, I will appreciate it.
>
> Thanks.
>
>
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