Revise coloring in transcript widget

[jwrth]

Currently the colors are assigned when loading the transcript viewer, which lowers performance and can lead to duplicate colors when displaying multiple transcripts. It might make more sense to predefine a large set of optimized colors and use those. The glasbey package does this for large number of colors. One could once generate a list of hexcolors and save them somewhere in the package instead of generating them in situ.

Glasbey default:

import glasbey
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches

colors = glasbey.create_palette(palette_size=20)

fig, ax = plt.subplots(figsize=(10, 1))
for i, c in enumerate(colors):
    ax.add_patch(mpatches.Rectangle((i, 0), 1, 1, color=c))
ax.set_xlim(0, len(colors))
ax.set_ylim(0, 1)
ax.axis('off')
plt.tight_layout()
plt.show()

Shiny colors:

import glasbey
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches

colors = glasbey.create_palette(
    palette_size=20,
    lightness_bounds=(30, 70),
    chroma_bounds=(60, 100),
)

fig, ax = plt.subplots(figsize=(10, 1))
for i, c in enumerate(colors):
    ax.add_patch(mpatches.Rectangle((i, 0), 1, 1, color=c))
ax.set_xlim(0, len(colors))
ax.set_ylim(0, 1)
ax.axis('off')
plt.tight_layout()
plt.show()