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custom_cmap.py
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custom_cmap.py
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# importing Qt widgets
from PySide2.QtWidgets import *
# importing system
import sys
# importing numpy as np
import numpy as np
# importing pyqtgraph as pg
import pyqtgraph as pg
from PySide2.QtGui import *
from PySide2.QtCore import *
from collections import namedtuple
class Window(QMainWindow):
def __init__(self):
super().__init__()
# setting title
self.setWindowTitle("PyQtGraph")
# setting geometry
self.setGeometry(100, 100, 600, 500)
# icon
icon = QIcon("skin.png")
# setting icon to the window
self.setWindowIcon(icon)
# calling method
self.UiComponents()
# showing all the widgets
self.show()
# setting fixed size of window
self.setFixedSize(QSize(600, 500))
# method for components
def UiComponents(self):
# creating a widget object
widget = QWidget()
# creating a label
label = QLabel("Geeksforgeeks Image View")
# setting minimum width
label.setMinimumWidth(130)
# making label do word wrap
label.setWordWrap(True)
# setting configuration options
pg.setConfigOptions(antialias=True)
# creating image view view object
imv = pg.ImageView()
# Create random 3D data set with noisy signals
img = pg.gaussianFilter(np.random.normal(
size=(200, 200)), (5, 5)) * 20 + 100
# setting new axis to image
img = img[np.newaxis, :, :]
# decay data
decay = np.exp(-np.linspace(0, 0.3, 100))[:, np.newaxis, np.newaxis]
# random data
data = np.random.normal(size=(100, 200, 200))
data += img * decay
data += 2
# adding time-varying signal
sig = np.zeros(data.shape[0])
sig[30:] += np.exp(-np.linspace(1, 10, 70))
sig[40:] += np.exp(-np.linspace(1, 10, 60))
sig[70:] += np.exp(-np.linspace(1, 10, 30))
sig = sig[:, np.newaxis, np.newaxis] * 3
data[:, 50:60, 30:40] += sig
testimage = np.random.rand(500,500)*300
# Displaying the data and assign each frame a time value from 1.0 to 3.0
#imv.setImage(data, xvals=np.linspace(1., 3., data.shape[0]))
imv.setImage(testimage)
# Set a custom color map
colors = [
(0, 0, 255),
(10, 60, 200),
(30, 120, 100),
(60, 255, 60),
(100, 120, 30),
(200, 60, 10),
(255, 0, 0)
]
colors_3 = ['#0a1ba2','#51ff00','#bc0707']
colors_2 = ['#bc0707','#0a1ba2',]
print(type(colors_3))
print(isinstance(colors_3,str))
print(type('#0a1ba2'))
target = 50
max_value = 100
cmap_target = target/max_value
#color map
#cmap = pg.ColorMap(pos=np.linspace(0.0, 1.0, 6), color=colors)
#cmap = pg.ColorMap(pos=np.linspace(0.0, cmap_target, 2), color=colors_2)
#cmap = pg.ColorMap(pos=None, color=colors_3)
cmap = pg.colormap.get('jet', source='matplotlib', skipCache=True)
cmap.pos = np.linspace(0.0, cmap_target, 10)
# setting color map to the image view
imv.setColorMap(cmap)
# Creating a grid layout
layout = QGridLayout()
# minimum width value of the label
label.setFixedWidth(130)
# setting this layout to the widget
widget.setLayout(layout)
# adding label in the layout
layout.addWidget(label, 1, 0)
# plot window goes on right side, spanning 3 rows
layout.addWidget(imv, 0, 1, 3, 1)
# setting this widget as central widget of the main window
self.setCentralWidget(widget)
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec_())