Lay out Toyplot legends horizontally

horizontal_legend.py

from PIL import ImageFont
import toyplot

series_names = ["Series 1", "Series 2", "Series 3"]
canvas = toyplot.Canvas(width=300, height=300)

font = ImageFont.load_default()
next_x = 0
for legend in series_names:
    canvas.legend([
        (legend, {"shape": "s", "mstyle":{"fill":"green", "stroke": "none"}})
        ],
        rect=(next_x, 0, 200, 30))
        
    # some trial and error was used to scale this right
    next_x = next_x + 30 + (1.2 * font.getsize(legend)[0])