/usr/lib/python2.7/dist-packages/pyqtgraph/graphicsItems/LegendItem.py is in python-pyqtgraph 0.9.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | from .GraphicsWidget import GraphicsWidget
from .LabelItem import LabelItem
from ..Qt import QtGui, QtCore
from .. import functions as fn
from ..Point import Point
from .ScatterPlotItem import ScatterPlotItem, drawSymbol
from .PlotDataItem import PlotDataItem
from .GraphicsWidgetAnchor import GraphicsWidgetAnchor
__all__ = ['LegendItem']
class LegendItem(GraphicsWidget, GraphicsWidgetAnchor):
"""
Displays a legend used for describing the contents of a plot.
LegendItems are most commonly created by calling PlotItem.addLegend().
Note that this item should not be added directly to a PlotItem. Instead,
Make it a direct descendant of the PlotItem::
legend.setParentItem(plotItem)
"""
def __init__(self, size=None, offset=None):
"""
============== ===============================================================
**Arguments:**
size Specifies the fixed size (width, height) of the legend. If
this argument is omitted, the legend will autimatically resize
to fit its contents.
offset Specifies the offset position relative to the legend's parent.
Positive values offset from the left or top; negative values
offset from the right or bottom. If offset is None, the
legend must be anchored manually by calling anchor() or
positioned by calling setPos().
============== ===============================================================
"""
GraphicsWidget.__init__(self)
GraphicsWidgetAnchor.__init__(self)
self.setFlag(self.ItemIgnoresTransformations)
self.layout = QtGui.QGraphicsGridLayout()
self.setLayout(self.layout)
self.items = []
self.size = size
self.offset = offset
if size is not None:
self.setGeometry(QtCore.QRectF(0, 0, self.size[0], self.size[1]))
def setParentItem(self, p):
ret = GraphicsWidget.setParentItem(self, p)
if self.offset is not None:
offset = Point(self.offset)
anchorx = 1 if offset[0] <= 0 else 0
anchory = 1 if offset[1] <= 0 else 0
anchor = (anchorx, anchory)
self.anchor(itemPos=anchor, parentPos=anchor, offset=offset)
return ret
def addItem(self, item, name):
"""
Add a new entry to the legend.
============== ========================================================
**Arguments:**
item A PlotDataItem from which the line and point style
of the item will be determined or an instance of
ItemSample (or a subclass), allowing the item display
to be customized.
title The title to display for this item. Simple HTML allowed.
============== ========================================================
"""
label = LabelItem(name)
if isinstance(item, ItemSample):
sample = item
else:
sample = ItemSample(item)
row = self.layout.rowCount()
self.items.append((sample, label))
self.layout.addItem(sample, row, 0)
self.layout.addItem(label, row, 1)
self.updateSize()
def removeItem(self, name):
"""
Removes one item from the legend.
============== ========================================================
**Arguments:**
title The title displayed for this item.
============== ========================================================
"""
# Thanks, Ulrich!
# cycle for a match
for sample, label in self.items:
if label.text == name: # hit
self.items.remove( (sample, label) ) # remove from itemlist
self.layout.removeItem(sample) # remove from layout
sample.close() # remove from drawing
self.layout.removeItem(label)
label.close()
self.updateSize() # redraq box
def updateSize(self):
if self.size is not None:
return
height = 0
width = 0
#print("-------")
for sample, label in self.items:
height += max(sample.height(), label.height()) + 3
width = max(width, sample.width()+label.width())
#print(width, height)
#print width, height
self.setGeometry(0, 0, width+25, height)
def boundingRect(self):
return QtCore.QRectF(0, 0, self.width(), self.height())
def paint(self, p, *args):
p.setPen(fn.mkPen(255,255,255,100))
p.setBrush(fn.mkBrush(100,100,100,50))
p.drawRect(self.boundingRect())
def hoverEvent(self, ev):
ev.acceptDrags(QtCore.Qt.LeftButton)
def mouseDragEvent(self, ev):
if ev.button() == QtCore.Qt.LeftButton:
dpos = ev.pos() - ev.lastPos()
self.autoAnchor(self.pos() + dpos)
class ItemSample(GraphicsWidget):
""" Class responsible for drawing a single item in a LegendItem (sans label).
This may be subclassed to draw custom graphics in a Legend.
"""
## Todo: make this more generic; let each item decide how it should be represented.
def __init__(self, item):
GraphicsWidget.__init__(self)
self.item = item
def boundingRect(self):
return QtCore.QRectF(0, 0, 20, 20)
def paint(self, p, *args):
#p.setRenderHint(p.Antialiasing) # only if the data is antialiased.
opts = self.item.opts
if opts.get('fillLevel',None) is not None and opts.get('fillBrush',None) is not None:
p.setBrush(fn.mkBrush(opts['fillBrush']))
p.setPen(fn.mkPen(None))
p.drawPolygon(QtGui.QPolygonF([QtCore.QPointF(2,18), QtCore.QPointF(18,2), QtCore.QPointF(18,18)]))
if not isinstance(self.item, ScatterPlotItem):
p.setPen(fn.mkPen(opts['pen']))
p.drawLine(2, 18, 18, 2)
symbol = opts.get('symbol', None)
if symbol is not None:
if isinstance(self.item, PlotDataItem):
opts = self.item.scatter.opts
pen = fn.mkPen(opts['pen'])
brush = fn.mkBrush(opts['brush'])
size = opts['size']
p.translate(10,10)
path = drawSymbol(p, symbol, size, pen, brush)
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