Added TextItem and example
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@ -17,6 +17,7 @@ examples = OrderedDict([
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('Region-of-Interest', 'ROItypes.py'),
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('Region-of-Interest', 'ROItypes.py'),
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('GraphicsLayout', 'GraphicsLayout.py'),
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('GraphicsLayout', 'GraphicsLayout.py'),
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('Scatter Plot', 'ScatterPlot.py'),
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('Scatter Plot', 'ScatterPlot.py'),
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('Text Item', 'text.py'),
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('ViewBox', 'ViewBox.py'),
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('ViewBox', 'ViewBox.py'),
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('Arrow', 'Arrow.py'),
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('Arrow', 'Arrow.py'),
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])),
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])),
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@ -9,15 +9,44 @@ from pyqtgraph.Qt import QtCore, QtGui
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import numpy as np
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import numpy as np
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x = np.linspace(-100, 100, 1000)
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x = np.linspace(-20, 20, 1000)
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y = np.sin(x) / x
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y = np.sin(x) / x
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plot = pg.plot(x, y)
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plot = pg.plot() ## create an empty plot widget
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plot.setYRange(-1, 2)
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curve = plot.plot(x,y) ## add a single curve
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## Create text object, use HTML tags to specify color (default is black; won't be visible)
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## Create text object, use HTML tags to specify color/size
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text = pg.TextItem(html='<div style="text-align: center"><span style="color: #FFF;">This is the</span><br><span style="color: #FF0;">PEAK</span></div>')
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text = pg.TextItem(html='<div style="text-align: center"><span style="color: #FFF;">This is the</span><br><span style="color: #FF0; font-size: 16pt;">PEAK</span></div>', anchor=(-0.3,1.3), border='w', fill=(0, 0, 255, 100))
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plot.addItem(text)
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plot.addItem(text)
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text.setPos(0, y.max())
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text.setPos(0, y.max())
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## Draw an arrowhead next to the text box
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arrow = pg.ArrowItem(pos=(0, y.max()), angle=-45)
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plot.addItem(arrow)
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## Set up an animated arrow and text that track the curve
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curvePoint = pg.CurvePoint(curve)
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plot.addItem(curvePoint)
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text2 = pg.TextItem("test", anchor=(0.5, -1.0))
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text2.setParentItem(curvePoint)
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arrow2 = pg.ArrowItem(angle=90)
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arrow2.setParentItem(curvePoint)
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## update position every 10ms
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index = 0
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def update():
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global curvePoint, index
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index = (index + 1) % len(x)
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curvePoint.setPos(float(index)/(len(x)-1))
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#text2.viewRangeChanged()
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text2.setText('[%0.1f, %0.1f]' % (x[index], y[index]))
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timer = QtCore.QTimer()
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timer.timeout.connect(update)
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timer.start(10)
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## Start Qt event loop unless running in interactive mode or using pyside.
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## Start Qt event loop unless running in interactive mode or using pyside.
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import sys
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import sys
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@ -14,12 +14,15 @@ class CurvePoint(GraphicsObject):
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Note: This class does not display anything; see CurveArrow for an applied example
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Note: This class does not display anything; see CurveArrow for an applied example
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"""
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"""
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def __init__(self, curve, index=0, pos=None):
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def __init__(self, curve, index=0, pos=None, rotate=True):
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"""Position can be set either as an index referring to the sample number or
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"""Position can be set either as an index referring to the sample number or
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the position 0.0 - 1.0"""
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the position 0.0 - 1.0
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If *rotate* is True, then the item rotates to match the tangent of the curve.
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"""
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GraphicsObject.__init__(self)
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GraphicsObject.__init__(self)
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#QObjectWorkaround.__init__(self)
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#QObjectWorkaround.__init__(self)
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self._rotate = rotate
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self.curve = weakref.ref(curve)
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self.curve = weakref.ref(curve)
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self.setParentItem(curve)
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self.setParentItem(curve)
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self.setProperty('position', 0.0)
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self.setProperty('position', 0.0)
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@ -76,6 +79,7 @@ class CurvePoint(GraphicsObject):
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p2 = self.parentItem().mapToScene(QtCore.QPointF(x[i2], y[i2]))
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p2 = self.parentItem().mapToScene(QtCore.QPointF(x[i2], y[i2]))
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ang = np.arctan2(p2.y()-p1.y(), p2.x()-p1.x()) ## returns radians
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ang = np.arctan2(p2.y()-p1.y(), p2.x()-p1.x()) ## returns radians
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self.resetTransform()
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self.resetTransform()
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if self._rotate:
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self.rotate(180+ ang * 180 / np.pi) ## takes degrees
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self.rotate(180+ ang * 180 / np.pi) ## takes degrees
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QtGui.QGraphicsItem.setPos(self, *newPos)
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QtGui.QGraphicsItem.setPos(self, *newPos)
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return True
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return True
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120
graphicsItems/TextItem.py
Normal file
120
graphicsItems/TextItem.py
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@ -0,0 +1,120 @@
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from pyqtgraph.Qt import QtCore, QtGui
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import pyqtgraph as pg
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from UIGraphicsItem import *
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class TextItem(UIGraphicsItem):
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"""
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GraphicsItem displaying unscaled text (the text will always appear normal even inside a scaled ViewBox).
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"""
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def __init__(self, text='', color=(200,200,200), html=None, anchor=(0,0), border=None, fill=None):
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"""
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Arguments:
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*text* The text to display
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*color* The color of the text (any format accepted by pg.mkColor)
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*html* If specified, this overrides both *text* and *color*
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*anchor* A QPointF or (x,y) sequence indicating what region of the text box will
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be anchored to the item's position. A value of (0,0) sets the upper-left corner
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of the text box to be at the position specified by setPos(), while a value of (1,1)
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sets the lower-right corner.
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*border* A pen to use when drawing the border
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*fill* A brush to use when filling within the border
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"""
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UIGraphicsItem.__init__(self)
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self.textItem = QtGui.QGraphicsTextItem()
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self.lastTransform = None
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self._bounds = QtCore.QRectF()
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if html is None:
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self.setText(text, color)
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else:
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self.setHtml(html)
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self.anchor = pg.Point(anchor)
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self.fill = pg.mkBrush(fill)
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self.border = pg.mkPen(border)
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#self.setFlag(self.ItemIgnoresTransformations) ## This is required to keep the text unscaled inside the viewport
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def setText(self, text, color=(200,200,200)):
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color = pg.mkColor(color)
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self.textItem.setDefaultTextColor(color)
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self.textItem.setPlainText(text)
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#html = '<span style="color: #%s; text-align: center;">%s</span>' % (color, text)
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#self.setHtml(html)
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def updateAnchor(self):
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pass
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#self.resetTransform()
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#self.translate(0, 20)
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def setPlainText(self, *args):
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self.textItem.setPlainText(*args)
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self.updateText()
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def setHtml(self, *args):
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self.textItem.setHtml(*args)
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self.updateText()
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def setTextWidth(self, *args):
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self.textItem.setTextWidth(*args)
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self.updateText()
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def setFont(self, *args):
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self.textItem.setFont(*args)
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self.updateText()
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def updateText(self):
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self.viewRangeChanged()
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#def getImage(self):
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#if self.img is None:
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#br = self.textItem.boundingRect()
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#img = QtGui.QImage(int(br.width()), int(br.height()), QtGui.QImage.Format_ARGB32)
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#p = QtGui.QPainter(img)
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#self.textItem.paint(p, QtGui.QStyleOptionGraphicsItem(), None)
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#p.end()
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#self.img = img
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#return self.img
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def textBoundingRect(self):
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## return the bounds of the text box in device coordinates
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pos = self.mapToDevice(QtCore.QPointF(0,0))
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if pos is None:
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return None
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tbr = self.textItem.boundingRect()
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return QtCore.QRectF(pos.x() - tbr.width()*self.anchor.x(), pos.y() - tbr.height()*self.anchor.y(), tbr.width(), tbr.height())
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def viewRangeChanged(self):
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br = self.textBoundingRect()
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if br is None:
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return
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self.prepareGeometryChange()
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self._bounds = self.deviceTransform().inverted()[0].mapRect(br)
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#print self._bounds
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def boundingRect(self):
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return self._bounds
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def paint(self, p, *args):
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tr = p.transform()
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if self.lastTransform is not None:
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if tr != self.lastTransform:
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self.viewRangeChanged()
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self.lastTransform = tr
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tbr = self.textBoundingRect()
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#p.setPen(pg.mkPen('r'))
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#p.drawRect(self.boundingRect())
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p.setPen(self.border)
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p.setBrush(self.fill)
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#p.fillRect(tbr)
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p.resetTransform()
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p.drawRect(tbr)
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p.translate(tbr.left(), tbr.top())
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self.textItem.paint(p, QtGui.QStyleOptionGraphicsItem(), None)
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