63 lines
2.0 KiB
Python
63 lines
2.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
"""
|
|
This example shows how to insert text into a scene using TextItem. This class
|
|
is for displaying text that is anchored to a particular location in the data
|
|
coordinate system, but which is always displayed unscaled.
|
|
|
|
For text that scales with the data, use QTextItem.
|
|
For text that can be placed in a layout, use LabelItem.
|
|
"""
|
|
|
|
import initExample ## Add path to library (just for examples; you do not need this)
|
|
|
|
import pyqtgraph as pg
|
|
from pyqtgraph.Qt import QtCore, QtGui
|
|
import numpy as np
|
|
|
|
|
|
x = np.linspace(-20, 20, 1000)
|
|
y = np.sin(x) / x
|
|
plot = pg.plot() ## create an empty plot widget
|
|
plot.setYRange(-1, 2)
|
|
plot.setWindowTitle('pyqtgraph example: text')
|
|
curve = plot.plot(x,y) ## add a single curve
|
|
|
|
## Create text object, use HTML tags to specify color/size
|
|
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))
|
|
plot.addItem(text)
|
|
text.setPos(0, y.max())
|
|
|
|
## Draw an arrowhead next to the text box
|
|
arrow = pg.ArrowItem(pos=(0, y.max()), angle=-45)
|
|
plot.addItem(arrow)
|
|
|
|
|
|
## Set up an animated arrow and text that track the curve
|
|
curvePoint = pg.CurvePoint(curve)
|
|
plot.addItem(curvePoint)
|
|
text2 = pg.TextItem("test", anchor=(0.5, -1.0))
|
|
text2.setParentItem(curvePoint)
|
|
arrow2 = pg.ArrowItem(angle=90)
|
|
arrow2.setParentItem(curvePoint)
|
|
|
|
## update position every 10ms
|
|
index = 0
|
|
def update():
|
|
global curvePoint, index
|
|
index = (index + 1) % len(x)
|
|
curvePoint.setPos(float(index)/(len(x)-1))
|
|
#text2.viewRangeChanged()
|
|
text2.setText('[%0.1f, %0.1f]' % (x[index], y[index]))
|
|
|
|
timer = QtCore.QTimer()
|
|
timer.timeout.connect(update)
|
|
timer.start(10)
|
|
|
|
|
|
|
|
## Start Qt event loop unless running in interactive mode or using pyside.
|
|
if __name__ == '__main__':
|
|
import sys
|
|
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
|
|
QtGui.QApplication.instance().exec_()
|