68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
from .GraphicsWidget import GraphicsWidget
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from .LabelItem import LabelItem
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from ..Qt import QtGui, QtCore
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from .. import functions as fn
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__all__ = ['LegendItem']
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class LegendItem(GraphicsWidget):
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"""
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Displays a legend used for describing the contents of a plot.
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Note that this item should not be added directly to a PlotItem. Instead,
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Make it a direct descendant of the PlotItem::
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legend.setParentItem(plotItem)
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"""
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def __init__(self, size, offset):
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GraphicsWidget.__init__(self)
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self.setFlag(self.ItemIgnoresTransformations)
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self.layout = QtGui.QGraphicsGridLayout()
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self.setLayout(self.layout)
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self.items = []
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self.size = size
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self.offset = offset
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self.setGeometry(QtCore.QRectF(self.offset[0], self.offset[1], self.size[0], self.size[1]))
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def addItem(self, item, title):
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"""
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Add a new entry to the legend.
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=========== ========================================================
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Arguments
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item A PlotDataItem from which the line and point style
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of the item will be determined
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title The title to display for this item. Simple HTML allowed.
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=========== ========================================================
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"""
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label = LabelItem(title)
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sample = ItemSample(item)
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row = len(self.items)
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self.items.append((sample, label))
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self.layout.addItem(sample, row, 0)
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self.layout.addItem(label, row, 1)
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def boundingRect(self):
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return QtCore.QRectF(0, 0, self.size[0], self.size[1])
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def paint(self, p, *args):
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p.setPen(fn.mkPen(255,255,255,100))
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p.setBrush(fn.mkBrush(100,100,100,50))
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p.drawRect(self.boundingRect())
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class ItemSample(GraphicsWidget):
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def __init__(self, item):
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GraphicsWidget.__init__(self)
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self.item = item
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def boundingRect(self):
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return QtCore.QRectF(0, 0, 20, 20)
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def paint(self, p, *args):
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p.setPen(fn.mkPen(self.item.opts['pen']))
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p.drawLine(2, 18, 18, 2)
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