Note
Go to the end to download the full example code.
Export Figure#
Display one shapes layer ontop of one image layer using the add_shapes
and
add_image
APIs. When the window is closed it will print the coordinates of
your shapes.
![export figure](../_images/sphx_glr_export_figure_001.png)
import numpy as np
from skimage import data
import napari
# create the viewer and window
viewer = napari.Viewer()
# add the image
img_layer = viewer.add_image(data.camera(), name='photographer')
img_layer.colormap = 'gray'
# create a list of polygons
polygons = [
np.array([[11, 13], [111, 113], [22, 246]]),
np.array(
[
[505, 60],
[402, 71],
[383, 42],
[251, 95],
[212, 59],
[131, 137],
[126, 187],
[191, 204],
[171, 248],
[211, 260],
[273, 243],
[264, 225],
[430, 173],
[512, 160],
]
),
np.array(
[
[310, 382],
[229, 381],
[209, 401],
[221, 411],
[258, 411],
[300, 412],
[306, 435],
[268, 434],
[265, 454],
[298, 461],
[307, 461],
[307, 507],
[349, 510],
[352, 369],
[330, 366],
[330, 366],
]
),
]
# add polygons
layer = viewer.add_shapes(
polygons,
shape_type='polygon',
edge_width=1,
edge_color='coral',
face_color='royalblue',
name='shapes',
)
# add an ellipse to the layer
ellipse = np.array([[59, 222], [110, 289], [170, 243], [119, 176]])
layer.add(
ellipse,
shape_type='ellipse',
edge_width=5,
edge_color='coral',
face_color='purple',
)
labels = layer.to_labels([512, 512])
labels_layer = viewer.add_labels(labels, name='labels')
points = np.array([[100, 100], [200, 200], [333, 111]])
size = np.array([10, 20, 20])
viewer.add_points(points, size=size)
# Add scale bar of a defined length to the exported figure
viewer.scale_bar.visible = True
viewer.scale_bar.length = 250
# Export figure and change theme before and after exporting to show that the background canvas margins
# are not in the exported figure.
viewer.theme = "light"
# Optionally for saving the exported figure: viewer.export_figure(path="export_figure.png")
export_figure = viewer.export_figure()
scaled_export_figure = viewer.export_figure(scale_factor=5)
viewer.theme = "dark"
viewer.add_image(export_figure, rgb=True, name='exported_figure')
viewer.add_image(scaled_export_figure, rgb=True, name='scaled_exported_figure')
viewer.reset_view()
# from skimage.io import imsave
# imsave('screenshot.png', screenshot)
if __name__ == '__main__':
napari.run()