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mouse_drag_callback.py

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"""

Mouse drag callback

===================

Example updating the status bar with line profile info while dragging

lines around in a shapes layer.

.. tags:: gui

"""

importnumpyasnp

fromskimageimportdata,measure

importnapari

defprofile_lines(image,shape_layer):

profile_data= [

measure.profile_line(image,line[0],line[1],mode='reflect').mean()

forlineinshape_layer.data

]

print(f"profile means: [{', '.join(f'{d:.2f}'fordinprofile_data)}]")

np.random.seed(1)

viewer=napari.Viewer()

blobs=data.binary_blobs(length=512,volume_fraction=0.1,n_dim=2)

viewer.add_image(blobs,name='blobs')

line1=np.array([[11,13], [111,113]])

line2=np.array([[200,200], [400,300]])

lines= [line1,line2]

shapes_layer=viewer.add_shapes(

lines,

shape_type='line',

edge_width=5,

edge_color='coral',

face_color='royalblue',

)

shapes_layer.mode='select'

@shapes_layer.mouse_drag_callbacks.append

defprofile_lines_drag(layer,event):

profile_lines(blobs,layer)

yield

whileevent.type=='mouse_move':

profile_lines(blobs,layer)

# the yield statement allows the mouse UI to keep working while

# this loop is executed repeatedly

yield

if__name__=='__main__':

napari.run()

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