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+ """
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+ Minimal PyQt example that displays an image. Press "r" key to autoscale
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+ """
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+ from PyQt6 import QtWidgets
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+ import fastplotlib as fpl
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+ import imageio .v3 as iio
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+
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+ # Qt app MUST be instantiated before creating any fpl objects, or any other Qt objects
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+ app = QtWidgets .QApplication ([])
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+
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+ img = iio .imread ("imageio:astronaut.png" )
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+
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+ # force qt canvas, wgpu will sometimes pick glfw by default even if Qt is present
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+ plot = fpl .Plot (canvas = "qt" )
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+
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+ plot .add_image (img )
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+ plot .camera .local .scale *= - 1
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+
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+ # must call plot.show() to start rendering loop
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+ plot .show ()
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+
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+ # set QWidget initial size from image width and height
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+ plot .canvas .resize (* img .shape [:2 ])
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+
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+
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+ def autoscale (ev ):
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+ if ev .key == "r" :
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+ plot .auto_scale ()
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+
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+
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+ # useful if you pan/zoom away from the image
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+ plot .renderer .add_event_handler (autoscale , "key_down" )
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+
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+ # execute Qt app
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+ app .exec ()
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