Calculator with interactive picture — how?

You need to create a calculator like this:
www.cras-center.spb.ru/calculator
tlr-group.ru/calc
service-vao.ru/calculator
sto48.ru/calc

In what direction to dig? Any material on the subject
July 9th 19 at 10:30
2 answers
July 9th 19 at 10:32
svg raphael.js
July 9th 19 at 10:34
99% of these calculators are handmade. At the time, had to do something similar and will tell you so, the requirements are always so unique that it is impossible to use anything else.

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