Change papersize city background

[JulesL2]

I have been looking at this TODO:

pretty-gpx/pretty_gpx/rendering_modes/city/drawing/city_background.py

Line 76 in 21385bf

# TODO(upgrade): Change the paper size. For now, just copy the full data and let the plot hide the rest

I did create 2 functions to check if surfaces or roads were inside bounds or outside and I did the comparison on Berlin marathon (see the PR that mention this issue):

Without these functions:

• change_papersize function's cost is 0
• Drawing cost is 1.7s
• Total cost: 1.7s
• Size of the A4 poster for Berlin : 8.4MB

With these functions

• change_papersize function's cost is 3.8s
• Drawing cost is 1.1s
• Total cost: 4.9s
• Size of the A4 poster for Berlin : 6.4MB

Conclusion:

We got a 25% decrease in poster size but a major rise in time spent to get the poster (3s)

Remark:

90% of the cost if the change papersize comes from roads, we could imagine enhancing the pretreatment when creating the roads to reduce this cost.