pyqtgraph/graphicsItems/LabelItem.py

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from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph.functions as fn
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from .GraphicsWidget import GraphicsWidget
__all__ = ['LabelItem']
class LabelItem(GraphicsWidget):
"""
GraphicsWidget displaying text.
Used mainly as axis labels, titles, etc.
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Note: To display text inside a scaled view (ViewBox, PlotWidget, etc) use TextItem
"""
def __init__(self, text=' ', parent=None, angle=0, **args):
GraphicsWidget.__init__(self, parent)
self.item = QtGui.QGraphicsTextItem(self)
self.opts = {
'color': 'CCC',
'justify': 'center'
}
self.opts.update(args)
self.sizeHint = {}
self.setText(text)
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self.setAngle(angle)
def setAttr(self, attr, value):
"""Set default text properties. See setText() for accepted parameters."""
self.opts[attr] = value
def setText(self, text, **args):
"""Set the text and text properties in the label. Accepts optional arguments for auto-generating
a CSS style string:
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==================== ==============================
**Style Arguments:**
color (str) example: 'CCFF00'
size (str) example: '8pt'
bold (bool)
italic (bool)
==================== ==============================
"""
self.text = text
opts = self.opts.copy()
for k in args:
opts[k] = args[k]
optlist = []
if 'color' in opts:
if isinstance(opts['color'], QtGui.QColor):
opts['color'] = fn.colorStr(opts['color'])[:6]
optlist.append('color: #' + opts['color'])
if 'size' in opts:
optlist.append('font-size: ' + opts['size'])
if 'bold' in opts and opts['bold'] in [True, False]:
optlist.append('font-weight: ' + {True:'bold', False:'normal'}[opts['bold']])
if 'italic' in opts and opts['italic'] in [True, False]:
optlist.append('font-style: ' + {True:'italic', False:'normal'}[opts['italic']])
full = "<span style='%s'>%s</span>" % ('; '.join(optlist), text)
#print full
self.item.setHtml(full)
self.updateMin()
self.resizeEvent(None)
self.update()
def resizeEvent(self, ev):
#c1 = self.boundingRect().center()
#c2 = self.item.mapToParent(self.item.boundingRect().center()) # + self.item.pos()
#dif = c1 - c2
#self.item.moveBy(dif.x(), dif.y())
#print c1, c2, dif, self.item.pos()
if self.opts['justify'] == 'left':
self.item.setPos(0,0)
elif self.opts['justify'] == 'center':
bounds = self.item.mapRectToParent(self.item.boundingRect())
self.item.setPos(self.width()/2. - bounds.width()/2., 0)
elif self.opts['justify'] == 'right':
bounds = self.item.mapRectToParent(self.item.boundingRect())
self.item.setPos(self.width() - bounds.width(), 0)
#if self.width() > 0:
#self.item.setTextWidth(self.width())
def setAngle(self, angle):
self.angle = angle
self.item.resetTransform()
self.item.rotate(angle)
self.updateMin()
def updateMin(self):
bounds = self.item.mapRectToParent(self.item.boundingRect())
self.setMinimumWidth(bounds.width())
self.setMinimumHeight(bounds.height())
self.sizeHint = {
QtCore.Qt.MinimumSize: (bounds.width(), bounds.height()),
QtCore.Qt.PreferredSize: (bounds.width(), bounds.height()),
QtCore.Qt.MaximumSize: (-1, -1), #bounds.width()*2, bounds.height()*2),
QtCore.Qt.MinimumDescent: (0, 0) ##?? what is this?
}
self.update()
def sizeHint(self, hint, constraint):
if hint not in self.sizeHint:
return QtCore.QSizeF(0, 0)
return QtCore.QSizeF(*self.sizeHint[hint])
#def paint(self, p, *args):
#p.setPen(fn.mkPen('r'))
#p.drawRect(self.rect())
#p.drawRect(self.item.boundingRect())
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