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"""Animation shows the code bellow and an interactive demo it produces in a small window with colored regions over image changing with mouse movement""" import numpy as np import py5 from skimage import measure # from https://scikit-image.org/docs/stable/auto_examples/edges/plot_contours.html x, y = np.ogrid[-np.pi : np.pi : 400j, -np.pi : np.pi : 400j] r = np.sin(np.exp(np.sin(x) ** 3 + np.cos(y) ** 2)) r = r.T r *= 255 def setup(): global img py5.size(400, 400) py5.color_mode(py5.HSB) img = py5.create_image_from_numpy(r.T, 'L') def draw(): py5.image(img, 0, 0) t = py5.mouse_x / py5.width * 255 contours = measure.find_contours(r, t) for i, contour in enumerate(contours): py5.fill(i * 32, 255, 255, 150) with py5.begin_closed_shape(): py5.vertices(contour) py5.run_sketch(block=False)