from pyqtgraph.Qt import QtCore, QtGui import pyqtgraph as pg from .UIGraphicsItem import * import pyqtgraph.functions as fn 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): """ =========== ================================================================================= Arguments: *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 =========== ================================================================================= """ 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.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 = '%s' % (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) #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) p.translate(tbr.left(), tbr.top()) self.textItem.paint(p, QtGui.QStyleOptionGraphicsItem(), None)