Add ColorBarItem for simplified image level adjustment (#1596)
* Initial implementation of ColorBarItem * initial commit * fixed missing indent * docstring extension and corrections * Converted example to match others / run as part of tests * load local color maps instead of importing from colorcet * clean up window creation code * horizontal color bar and clean-up * switched to mkQApp initialization * cleaned up some comments
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Nils Nemitz
GitHub
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examples/ColorBarItem.py
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100
examples/ColorBarItem.py
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@ -0,0 +1,100 @@
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# -*- 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), cmap=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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cmap=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 = 'horizontal',
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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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cmap=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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mkQApp().exec_()
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@ -1,14 +1,8 @@
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# -*- coding: utf-8 -*-
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"""
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This example demonstrates the use of ImageView, which is a high-level widget for
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displaying and analyzing 2D and 3D data. ImageView provides:
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1. A zoomable region (ViewBox) for displaying the image
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2. A combination histogram and gradient editor (HistogramLUTItem) for
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controlling the visual appearance of the image
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3. A timeline for selecting the currently displayed frame (for 3D data only).
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4. Tools for very basic analysis of image data (see ROI and Norm buttons)
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This example demonstrates generating ColorMap objects from external data.
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It displays the full list of color maps available as local files or by import
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from Matplotlib or ColorCET.
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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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@ -38,6 +38,7 @@ examples = OrderedDict([
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('FillBetweenItem', 'FillBetweenItem.py'),
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('ImageItem - video', 'ImageItem.py'),
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('ImageItem - draw', 'Draw.py'),
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('ColorBarItem','ColorBarItem.py'),
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('Non-uniform Image', 'NonUniformImage.py'),
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('Region-of-Interest', 'ROIExamples.py'),
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('Bar Graph', 'BarGraphItem.py'),
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@ -223,6 +223,7 @@ from .graphicsItems.GraphicsWidgetAnchor import *
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from .graphicsItems.PlotCurveItem import *
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from .graphicsItems.ButtonItem import *
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from .graphicsItems.GradientEditorItem import *
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from .graphicsItems.ColorBarItem import *
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from .graphicsItems.MultiPlotItem import *
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from .graphicsItems.ErrorBarItem import *
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from .graphicsItems.IsocurveItem import *
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258
pyqtgraph/graphicsItems/ColorBarItem.py
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258
pyqtgraph/graphicsItems/ColorBarItem.py
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# -*- coding: utf-8 -*-
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from ..Qt import QtCore
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from .. import functions as fn
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from .PlotItem import PlotItem
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from .ImageItem import ImageItem
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from .LinearRegionItem import LinearRegionItem
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import weakref
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import math
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import numpy as np
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__all__ = ['ColorBarItem']
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class ColorBarItem(PlotItem):
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"""
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**Bases:** :class:`PlotItem <pyqtgraph.PlotItem>`
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ColorBarItem is a simpler, compact alternative to HistogramLUTItem, without histogram
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or the option to adjust the look-up table.
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A labeled axis is displayed directly next to the gradient to help identify values.
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Handles included in the color bar allow for interactive adjustment.
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A ColorBarItem can be assigned one or more ImageItems that will be displayed according
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to the selected color map and levels. The ColorBarItem can be used as a separate
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element in a GraphicsLayout or added to the layout of a PlotItem used to display image
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data with coordinate axes.
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============================= =============================================
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**Signals:**
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sigLevelsChanged(self) Emitted when the range sliders are moved
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sigLevelsChangeFinished(self) Emitted when the range sliders are released
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============================= =============================================
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"""
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sigLevelsChanged = QtCore.Signal(object)
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sigLevelsChangeFinished = QtCore.Signal(object)
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def __init__(self, values=(0,1), width=25, cmap=None, label=None,
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interactive=True, limits=None, rounding=1,
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orientation='vertical', pen='w', hoverPen='r', hoverBrush='#FF000080' ):
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"""
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Create a new ColorBarItem.
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============== ===========================================================================
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**Arguments:**
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values The range of values as tuple (min, max)
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width (default=25) The width of the displayed color bar
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cmap ColorMap object, look-up table is also applied to assigned ImageItem(s)
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label (default=None) Label applied to color bar axis
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interactive (default=True) Handles are displayed to interactively adjust level range
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limits Limits to adjustment range as (low, high) tuple, None disables limit
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rounding (default=1) Adjusted range values are rounded to multiples of this values
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orientation (default='vertical') 'horizontal' gives a horizontal color bar
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pen color of adjustement handles in interactive mode
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hoverPen color of adjustement handles when hovered over
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hoverBrush color of movable center region when hovered over
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============== ===========================================================================
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"""
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super().__init__()
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self.img_list = [] # list of controlled ImageItems
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self.values = values
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self.cmap = cmap
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self.rounding = rounding
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self.horizontal = bool(orientation == 'horizontal')
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self.lo_prv, self.hi_prv = self.values # remember previous values while adjusting range
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if limits is None:
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self.lo_lim = None
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self.hi_lim = None
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else:
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self.lo_lim, self.hi_lim = limits
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self.disableAutoRange()
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self.hideButtons()
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self.setMouseEnabled(x=False, y=False)
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self.setMenuEnabled( False)
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if self.horizontal:
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self.setRange( xRange=(0,256), yRange=(0,1), padding=0 )
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self.layout.setRowFixedHeight(2, width)
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else:
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self.setRange( xRange=(0,1), yRange=(0,256), padding=0 )
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self.layout.setColumnFixedWidth(1, width) # width of color bar
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for key in ['left','right','top','bottom']:
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self.showAxis(key)
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axis = self.getAxis(key)
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axis.setZValue(1)
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# select main axis:
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if self.horizontal and key == 'bottom':
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self.axis = axis
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elif not self.horizontal and key == 'right':
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self.axis = axis
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self.axis.setWidth(45)
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else: # show other axes to create frame
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axis.setStyle( showValues=False, tickLength=0 )
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self.axis.setStyle( showValues=True )
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self.axis.unlinkFromView()
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self.axis.setRange( self.values[0], self.values[1] )
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self.bar = ImageItem()
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if self.horizontal:
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self.bar.setImage( np.linspace(0, 1, 256).reshape( (-1,1) ) )
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if label is not None: self.getAxis('bottom').setLabel(label)
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else:
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self.bar.setImage( np.linspace(0, 1, 256).reshape( (1,-1) ) )
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if label is not None: self.getAxis('left').setLabel(label)
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self.addItem(self.bar)
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if cmap is not None: self.setCmap(cmap)
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if interactive:
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if self.horizontal:
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align = 'vertical'
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else:
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align = 'horizontal'
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self.region = LinearRegionItem(
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[63, 191], align, swapMode='block',
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# span=(0.15, 0.85), # limited span looks better, but disables grabbing the region
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pen=pen, brush=fn.mkBrush(None), hoverPen=hoverPen, hoverBrush=hoverBrush )
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self.region.setZValue(1000)
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self.region.lines[0].addMarker('<|>', size=6)
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self.region.lines[1].addMarker('<|>', size=6)
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self.region.sigRegionChanged.connect(self._regionChanging)
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self.region.sigRegionChangeFinished.connect(self._regionChanged)
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self.addItem(self.region)
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self.region_changed_enable = True
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self.region.setRegion( (63, 191) ) # place handles at 25% and 75% locations
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else:
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self.region = None
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self.region_changed_enable = False
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def setImageItem(self, img, insert_in=None):
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"""
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assign ImageItem or list of ImageItems to be controlled
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============== ==========================================================================
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**Arguments:**
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image ImageItem or list of [ImageItem, ImageItem, ...] that will be set to the
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color map of the ColorBarItem. In interactive mode, the levels of all
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assigned ImageItems will be controlled simultaneously.
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insert_in If a PlotItem is given, the color bar is inserted on the right or bottom
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of the plot
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============== ==========================================================================
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"""
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try:
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self.img_list = [ weakref.ref(item) for item in img ]
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except TypeError: # failed to iterate, make a single-item list
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self.img_list = [ weakref.ref( img ) ]
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if insert_in is not None:
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if self.horizontal:
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insert_in.layout.addItem( self, 5, 1 ) # insert in layout below bottom axis
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insert_in.layout.setRowFixedHeight(4, 10) # enforce some space to axis above
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else:
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insert_in.layout.addItem( self, 2, 5 ) # insert in layout after right-hand axis
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insert_in.layout.setColumnFixedWidth(4, 5) # enforce some space to axis on the left
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self._update_items( update_cmap = True )
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def setCmap(self, cmap):
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"""
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sets a ColorMap object to determine the ColorBarItem's look-up table. The same
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look-up table is applied to any assigned ImageItem.
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"""
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self.cmap = cmap
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self._update_items( update_cmap = True )
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def setLevels(self, values=None, low=None, high=None ):
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"""
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Sets the displayed range of levels as specified.
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============== ===========================================================================
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**Arguments:**
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values Specify levels by tuple (low, high). Either value can be None to leave
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to previous value unchanged. Takes precedence over low and high parameters.
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low new low level to be applied to color bar and assigned images
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high new high level to be applied to color bar and assigned images
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============== ===========================================================================
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"""
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if values is not None: # values setting takes precendence
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low, high = values
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lo_new, hi_new = low, high
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lo_cur, hi_cur = self.values
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# allow None values to preserve original values:
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if lo_new is None: lo_new = lo_cur
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if hi_new is None: hi_new = hi_cur
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if lo_new > hi_new: # prevent reversal
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lo_new = hi_new = (lo_new + hi_new) / 2
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# clip to limits if set:
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if self.lo_lim is not None and lo_new < self.lo_lim: lo_new = self.lo_lim
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if self.hi_lim is not None and hi_new > self.hi_lim: hi_new = self.hi_lim
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self.values = self.lo_prv, self.hi_prv = (lo_new, hi_new)
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self._update_items()
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def levels(self):
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""" returns the currently set levels as the tuple (low, high). """
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return self.values
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def _update_items(self, update_cmap=False):
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""" internal: update color maps for bar and assigned ImageItems """
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# update color bar:
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self.axis.setRange( self.values[0], self.values[1] )
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if update_cmap and self.cmap is not None:
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self.bar.setLookupTable( self.cmap.getLookupTable(nPts=256) )
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# update assigned ImageItems, too:
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for img_weakref in self.img_list:
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img = img_weakref()
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if img is None: continue # dereference weakref
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img.setLevels( self.values ) # (min,max) tuple
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if update_cmap and self.cmap is not None:
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img.setLookupTable( self.cmap.getLookupTable(nPts=256) )
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def _regionChanged(self):
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""" internal: snap adjusters back to default positions on release """
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self.lo_prv, self.hi_prv = self.values
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self.region_changed_enable = False # otherwise this affects the region again
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self.region.setRegion( (63, 191) )
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self.region_changed_enable = True
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self.sigLevelsChangeFinished.emit(self)
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def _regionChanging(self):
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""" internal: recalculate levels based on new position of adjusters """
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if not self.region_changed_enable: return
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bot, top = self.region.getRegion()
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bot = ( (bot - 63) / 64 ) # -1 to +1 over half-bar range
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top = ( (top - 191) / 64 ) # -1 to +1 over half-bar range
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bot = math.copysign( bot**2, bot ) # quadratic behaviour for sensitivity to small changes
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top = math.copysign( top**2, top )
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# These are the new values if adjuster is released now, rate of change depends on original separation
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span_prv = self.hi_prv - self.lo_prv # previous span of values
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hi_new = self.hi_prv + (span_prv + 2*self.rounding) * top # make sure that we can always
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lo_new = self.lo_prv + (span_prv + 2*self.rounding) * bot # reach 2x the minimal step
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# Alternative model with speed depending on level magnitude:
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# mean_val = abs(self.lo_prv) + abs(self.hi_prv) / 2
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# hi_new = self.hi_prv + (mean_val + 2*self.rounding) * top # make sure that we can always
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# lo_new = self.lo_prv + (mean_val + 2*self.rounding) * bot # reach 2x the minimal step
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if self.hi_lim is not None and hi_new > self.hi_lim: # limit maximum value
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# print('lim +')
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hi_new = self.hi_lim
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if lo_new > hi_new - span_prv: # avoid collapsing the span against top or bottom limits
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lo_new = hi_new - span_prv
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if self.lo_lim is not None and lo_new < self.lo_lim: # limit minimum value
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# print('lim -')
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lo_new = self.lo_lim
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if hi_new < lo_new + span_prv: # avoid collapsing the span against top or bottom limits
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hi_new = lo_new + span_prv
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if lo_new + self.rounding > hi_new: # do not allow less than one "rounding" unit of span
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# print('lim X')
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if bot == 0: hi_new = lo_new + self.rounding
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elif top == 0: lo_new = hi_new - self.rounding
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else:
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lo_new = (lo_new + hi_new - self.rounding) / 2
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hi_new = lo_new + self.rounding
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lo_new = self.rounding * round( lo_new/self.rounding )
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hi_new = self.rounding * round( hi_new/self.rounding )
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# if hi_new == lo_new: hi_new = lo_new + self.rounding # hack solution if axis span still collapses
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self.values = (lo_new, hi_new)
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self._update_items()
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self.sigLevelsChanged.emit(self)
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@ -43,8 +43,9 @@ class LinearRegionItem(GraphicsObject):
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**Arguments:**
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values A list of the positions of the lines in the region. These are not
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limits; limits can be set by specifying bounds.
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orientation Options are 'vertical' or 'horizontal', indicating the
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The default is 'vertical', indicating that the
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orientation Options are 'vertical' or 'horizontal'
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The default is 'vertical', indicating that the region is bounded
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by vertical lines.
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brush Defines the brush that fills the region. Can be any arguments that
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are valid for :func:`mkBrush <pyqtgraph.mkBrush>`. Default is
|
||||
transparent blue.
|
||||
|
||||
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Reference in New Issue
Block a user