9b41c90034
- Can be anchored to parent item at any location - Support for filled plot styles - Automatically resizes to fit contents - PlotItem can auto-generate legend
122 lines
4.3 KiB
Python
122 lines
4.3 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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from ..Point import Point
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from .GraphicsWidgetAnchor import GraphicsWidgetAnchor
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__all__ = ['LegendItem']
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class LegendItem(GraphicsWidget, GraphicsWidgetAnchor):
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"""
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Displays a legend used for describing the contents of a plot.
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LegendItems are most commonly created by calling PlotItem.addLegend().
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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=None, offset=None):
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"""
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========== ===============================================================
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Arguments
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size Specifies the fixed size (width, height) of the legend. If
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this argument is omitted, the legend will autimatically resize
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to fit its contents.
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offset Specifies the offset position relative to the legend's parent.
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Positive values offset from the left or top; negative values
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offset from the right or bottom. If offset is None, the
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legend must be anchored manually by calling anchor() or
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positioned by calling setPos().
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========== ===============================================================
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"""
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GraphicsWidget.__init__(self)
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GraphicsWidgetAnchor.__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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if size is not None:
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self.setGeometry(QtCore.QRectF(0, 0, self.size[0], self.size[1]))
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def setParentItem(self, p):
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ret = GraphicsWidget.setParentItem(self, p)
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if self.offset is not None:
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offset = Point(self.offset)
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anchorx = 1 if offset[0] <= 0 else 0
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anchory = 1 if offset[1] <= 0 else 0
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anchor = (anchorx, anchory)
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self.anchor(itemPos=anchor, parentPos=anchor, offset=offset)
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return ret
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def addItem(self, item, name):
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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(name)
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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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self.updateSize()
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def updateSize(self):
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if self.size is not None:
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return
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height = 0
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width = 0
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print "-------"
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for sample, label in self.items:
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height += max(sample.height(), label.height()) + 3
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width = max(width, sample.width()+label.width())
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print width, height
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print width, height
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self.setGeometry(0, 0, width+25, height)
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def boundingRect(self):
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return QtCore.QRectF(0, 0, self.width(), self.height())
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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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opts = self.item.opts
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if opts.get('fillLevel',None) is not None and opts.get('fillBrush',None) is not None:
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p.setBrush(fn.mkBrush(opts['fillBrush']))
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p.setPen(fn.mkPen(None))
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p.drawPolygon(QtGui.QPolygonF([QtCore.QPointF(2,18), QtCore.QPointF(18,2), QtCore.QPointF(18,18)]))
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p.setPen(fn.mkPen(opts['pen']))
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p.drawLine(2, 18, 18, 2)
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