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polygon_selector.py
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65 lines (45 loc) · 1.8 KB
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"""
Polygon Selectors
=================
Example showing how to use a `PolygonSelector` (a.k.a. lasso selector) with line collections
"""
# test_example = false
# sphinx_gallery_pygfx_docs = 'screenshot'
import numpy as np
import fastplotlib as fpl
from itertools import product
# create a figure
figure = fpl.Figure(size=(700, 560))
# generate some data
def make_circle(center, radius: float, n_points: int = 75) -> np.ndarray:
theta = np.linspace(0, 2 * np.pi, n_points)
xs = radius * np.sin(theta)
ys = radius * np.cos(theta)
return np.column_stack([xs, ys]) + center
spatial_dims = (50, 50)
circles = list()
for center in product(range(0, spatial_dims[0], 9), range(0, spatial_dims[1], 9)):
circles.append(make_circle(center, 3, n_points=75))
pos_xy = np.vstack(circles)
# add image
line_collection = figure[0, 0].add_line_collection(circles, cmap="jet", thickness=5)
# add polygon selector to image graphic
polygon_selector = line_collection.add_polygon_selector(
fill_color="#ff00ff", edge_color="#FFF", vertex_color="#FFF"
)
# add event handler to highlight selected indices
@polygon_selector.add_event_handler("selection")
def color_indices(ev):
line_collection.cmap = "jet"
ixs = ev.get_selected_indices()
# iterate through each of the selected indices, if the array size > 0 that mean it's under the selection
selected_line_ixs = [i for i in range(len(ixs)) if ixs[i].size > 0]
line_collection[selected_line_ixs].colors = "w"
# # manually move selector to make a nice gallery image :D
# polygon_selector.selection = (15, 30, 15, 30)
figure.show()
# NOTE: `if __name__ == "__main__"` is NOT how to use fastplotlib interactively
# please see our docs for using fastplotlib interactively in ipython and jupyter
if __name__ == "__main__":
print(__doc__)
fpl.loop.run()