" for s, t in chunks(trace, 2):\n",
" w, h = plot_wh[t.dir]\n",
" plt.arrow(s.x, s.y, w, h, head_width=0.1, head_length=0.1, fc=colour, ec=colour, length_includes_head=True)\n",
" for s, t in chunks(trace, 2):\n",
" w, h = plot_wh[t.dir]\n",
" plt.arrow(s.x, s.y, w, h, head_width=0.1, head_length=0.1, fc=colour, ec=colour, length_includes_head=True)\n",