101 lines
3.7 KiB
Python
101 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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This example demonstrates the use of ColorBarItem, which displays a simple interactive color bar.
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"""
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## Add path to library (just for examples; you do not need this)
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import initExample
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import numpy as np
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from pyqtgraph.Qt import QtWidgets, mkQApp
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import pyqtgraph as pg
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class MainWindow(QtWidgets.QMainWindow):
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""" example application main window """
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def __init__(self, *args, **kwargs):
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super(MainWindow, self).__init__(*args, **kwargs)
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gr_wid = pg.GraphicsLayoutWidget(show=True)
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self.setCentralWidget(gr_wid)
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self.setWindowTitle('pyqtgraph example: Interactive color bar')
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self.resize(800,700)
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self.show()
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## Create image items
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data = np.fromfunction(lambda i, j: (1+0.3*np.sin(i)) * (i)**2 + (j)**2, (100, 100))
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noisy_data = data * (1 + 0.2 * np.random.random(data.shape) )
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noisy_transposed = noisy_data.transpose()
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#--- add non-interactive image with integrated color -----------------
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i1 = pg.ImageItem(image=data)
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p1 = gr_wid.addPlot(title="non-interactive")
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p1.addItem( i1 )
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p1.setMouseEnabled( x=False, y=False)
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p1.disableAutoRange()
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p1.hideButtons()
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p1.setRange(xRange=(0,100), yRange=(0,100), padding=0)
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for key in ['left','right','top','bottom']:
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p1.showAxis(key)
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axis = p1.getAxis(key)
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axis.setZValue(1)
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if key in ['top', 'right']:
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p1.getAxis(key).setStyle( showValues=False )
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cmap = pg.colormap.get('CET-L9')
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bar = pg.ColorBarItem(
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interactive=False, values= (0, 30_000), colorMap=cmap,
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label='vertical fixed color bar'
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)
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bar.setImageItem( i1, insert_in=p1 )
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#--- add interactive image with integrated horizontal color bar --------------
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i2 = pg.ImageItem(image=noisy_data)
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p2 = gr_wid.addPlot(1,0, 1,1, title="interactive")
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p2.addItem( i2, title='' )
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# inserted color bar also works with labels on the right.
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p2.showAxis('right')
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p2.getAxis('left').setStyle( showValues=False )
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p2.getAxis('bottom').setLabel('bottom axis label')
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p2.getAxis('right').setLabel('right axis label')
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cmap = pg.colormap.get('CET-L4')
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bar = pg.ColorBarItem(
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values = (0, 30_000),
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colorMap=cmap,
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label='horizontal color bar',
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limits = (0, None),
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rounding=1000,
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orientation = 'h',
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pen='#8888FF', hoverPen='#EEEEFF', hoverBrush='#EEEEFF80'
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)
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bar.setImageItem( i2, insert_in=p2 )
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#--- multiple images adjusted by a separate color bar ------------------------
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i3 = pg.ImageItem(image=noisy_data)
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p3 = gr_wid.addPlot(0,1, 1,1, title="shared 1")
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p3.addItem( i3 )
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i4 = pg.ImageItem(image=noisy_transposed)
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p4 = gr_wid.addPlot(1,1, 1,1, title="shared 2")
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p4.addItem( i4 )
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cmap = pg.colormap.get('CET-L8')
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bar = pg.ColorBarItem(
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# values = (-15_000, 15_000),
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limits = (-30_000, 30_000), # start with full range...
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rounding=1000,
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width = 10,
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colorMap=cmap )
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bar.setImageItem( [i3, i4] )
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bar.setLevels( low=-5_000, high=15_000) # ... then adjust to retro sunset.
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# manually adjust reserved space at top and bottom to align with plot
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bar.getAxis('bottom').setHeight(21)
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bar.getAxis('top').setHeight(31)
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gr_wid.addItem(bar, 0,2, 2,1) # large bar spanning both rows
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mkQApp("ColorBarItem Example")
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main_window = MainWindow()
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## Start Qt event loop
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if __name__ == '__main__':
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pg.exec()
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