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map view for encointer currencies
encointer
JavaScript, substrate, polkadot
encointer features a registry of local community currencies that are defined by a set of meetup locations. The explorer shall feature a map view that allows users to explore all registered currencies and their meetup locations.
# story:
1. map shows global view with pins for every community.
1. user clicks a currency and map zooms in to fit the community area. every meetup location of this currency is marked with a pin. In a side-view, detailed information shows up
## optional extensions
* cluster community pins into groups indicating the number of communities if map gets cluttered
* same for meetup location pins within one currency
* user can hover over community pin and gets metainfo (`CurrencyIdentifyer`, currency name)
# detail view
The detail view shall list the following information
* CurrencyIdentifier hash
* currency properties
* name `encointerCurrencies.currencyProperties(cide).name_utf8`
* demurrage_rate `encointerCurrencies.currencyProperties(cide).demurrage_per_block` -> translate this into demurrage % per month
* list of bootstrappers `encointerCurrencies.bootstrappers ->Vec`
* money supply `encointerBalances.totalIssuance(cid)`
## optional extensions
* active population timeline: size of `encointerCeremonies.participantReputation(CurrencyCeremony, AccountId) -> Reputation` with Reputation= VerifiedLinked or VerifiedUnlinked for the last N ceremonies (plot a timeline with population size vs. time).
# look and feel
Right now we only forked a template. The only features we'd like to keep are:
* block number + finalized
* node info and version
everything else may be purged to get a clean look. The map should be the main thing. Design may be kept very simple.
*must be mobile-friendly*
# implementation
We use polkadot-js and publish to github pages (so only static page content!):
https://encointer.github.io/explorer/
query list of of currencies:
```
encointerCurrencies.currencyIdentifiers -> Vec
```
query list of meetup locations for one currency
```
encointerCurrencies.locations(cid) -> Vec
```
Location has field `lon`and `lat` of type `I32F32` which is a fixpoint value with 32 signed decimal bits and 32 fractional bits ([currently unsupported by polkadotjs](https://github.com/substrate-developer-hub/recipes/issues/201))
## maps
We would prefer to use open street maps. Map should be zoomable
* pins for communities must look different than pins for meetup locations (i.e. communities: circles, meetup locations: pointy pins)
# testing
See [our tutorial](https://book.encointer.org/testnet-gesell-tutorial.html) on how to add more communities for debugging
# acceptance
this task is deemed done when the *story* succeeds with testnet gesell when building the PR with `yarn build` and the specified informations can be explored.
to be tested in Firefox bowser on desktop and mobile
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