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"""
generates 'example_false_color_image.png'
"""
import numpy as np
import pyqtgraph as pg
import pyqtgraph.exporters as exp
from pyqtgraph.Qt import QtGui, mkQApp
mkQApp("ImageItem transform example")
class MainWindow(pg.GraphicsLayoutWidget):
""" example application main window """
def __init__(self):
super().__init__()
self.resize(440,400)
self.show()
plot = self.addPlot()
# Set To Larger Font
leftAxis = plot.getAxis('left')
bottomAxis = plot.getAxis('bottom')
font = QtGui.QFont("Roboto", 18)
leftAxis.setTickFont(font)
bottomAxis.setTickFont(font)
# Example: Transformed display of ImageItem
tr = QtGui.QTransform() # prepare ImageItem transformation:
tr.scale(6.0, 3.0) # scale horizontal and vertical axes
tr.translate(-1.5, -1.5) # move 3x3 image to locate center at axis origin
img = pg.ImageItem(
image=np.eye(3),
levels=(0,1)
) # create example image
img.setTransform(tr) # assign transform
plot.addItem( img ) # add ImageItem to PlotItem
plot.showAxes(True) # frame it with a full set of axes
plot.invertY(True) # vertical axis counts top to bottom
self.timer = pg.QtCore.QTimer( singleShot=True )
self.timer.timeout.connect(self.export)
self.timer.start(100)
def export(self):
exporter = exp.ImageExporter(self.scene())
exporter.parameters()['width'] = 440
exporter.export('example_imageitem_transform.png')
main_window = MainWindow()
if __name__ == '__main__':
pg.exec()
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