pyqtgraph/graphicsItems/TextItem.py

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from pyqtgraph.Qt import QtCore, QtGui
import pyqtgraph as pg
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from .UIGraphicsItem import *
import pyqtgraph.functions as fn
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class TextItem(UIGraphicsItem):
"""
GraphicsItem displaying unscaled text (the text will always appear normal even inside a scaled ViewBox).
"""
def __init__(self, text='', color=(200,200,200), html=None, anchor=(0,0), border=None, fill=None, angle=0):
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"""
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=========== =================================================================================
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Arguments:
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*text* The text to display
*color* The color of the text (any format accepted by pg.mkColor)
*html* If specified, this overrides both *text* and *color*
*anchor* A QPointF or (x,y) sequence indicating what region of the text box will
be anchored to the item's position. A value of (0,0) sets the upper-left corner
of the text box to be at the position specified by setPos(), while a value of (1,1)
sets the lower-right corner.
*border* A pen to use when drawing the border
*fill* A brush to use when filling within the border
=========== =================================================================================
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"""
## not working yet
#*angle* Angle in degrees to rotate text (note that the rotation assigned in this item's
#transformation will be ignored)
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UIGraphicsItem.__init__(self)
self.textItem = QtGui.QGraphicsTextItem()
self.lastTransform = None
self._bounds = QtCore.QRectF()
if html is None:
self.setText(text, color)
else:
self.setHtml(html)
self.anchor = pg.Point(anchor)
self.fill = pg.mkBrush(fill)
self.border = pg.mkPen(border)
self.angle = angle
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#self.setFlag(self.ItemIgnoresTransformations) ## This is required to keep the text unscaled inside the viewport
def setText(self, text, color=(200,200,200)):
color = pg.mkColor(color)
self.textItem.setDefaultTextColor(color)
self.textItem.setPlainText(text)
#html = '<span style="color: #%s; text-align: center;">%s</span>' % (color, text)
#self.setHtml(html)
def updateAnchor(self):
pass
#self.resetTransform()
#self.translate(0, 20)
def setPlainText(self, *args):
self.textItem.setPlainText(*args)
self.updateText()
def setHtml(self, *args):
self.textItem.setHtml(*args)
self.updateText()
def setTextWidth(self, *args):
self.textItem.setTextWidth(*args)
self.updateText()
def setFont(self, *args):
self.textItem.setFont(*args)
self.updateText()
def updateText(self):
self.viewRangeChanged()
#def getImage(self):
#if self.img is None:
#br = self.textItem.boundingRect()
#img = QtGui.QImage(int(br.width()), int(br.height()), QtGui.QImage.Format_ARGB32)
#p = QtGui.QPainter(img)
#self.textItem.paint(p, QtGui.QStyleOptionGraphicsItem(), None)
#p.end()
#self.img = img
#return self.img
def textBoundingRect(self):
## return the bounds of the text box in device coordinates
pos = self.mapToDevice(QtCore.QPointF(0,0))
if pos is None:
return None
tbr = self.textItem.boundingRect()
return QtCore.QRectF(pos.x() - tbr.width()*self.anchor.x(), pos.y() - tbr.height()*self.anchor.y(), tbr.width(), tbr.height())
def viewRangeChanged(self):
br = self.textBoundingRect()
if br is None:
return
self.prepareGeometryChange()
self._bounds = fn.invertQTransform(self.deviceTransform()).mapRect(br)
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#print self._bounds
def boundingRect(self):
return self._bounds
def paint(self, p, *args):
tr = p.transform()
if self.lastTransform is not None:
if tr != self.lastTransform:
self.viewRangeChanged()
self.lastTransform = tr
tbr = self.textBoundingRect()
#p.setPen(pg.mkPen('r'))
#p.drawRect(self.boundingRect())
p.setPen(self.border)
p.setBrush(self.fill)
#p.fillRect(tbr)
p.resetTransform()
#p.drawRect(tbr)
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p.translate(tbr.left(), tbr.top())
p.rotate(self.angle)
p.drawRect(QtCore.QRectF(0, 0, tbr.width(), tbr.height()))
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self.textItem.paint(p, QtGui.QStyleOptionGraphicsItem(), None)