Idea: region selection utility

[johnd0e]

There are A LOT of plugins (some we can see in #2) with same demand:

• choose several portals for further processing
• or just limit processing objects to some area

Instead of re-implement the same functions in each plugin it would be very convenient if IITC provides this as utility function(s).

And more: imho existing implementations are not generic enough.
E.g.:

• there is ability to limit area with polygon, but no ability to exclude some portals.
• draw-tools can be used for area selection, then one of 'point-in-polygon' algorithm implementations: Include pnpoly utility #552
• there are many other possible tools (see https://leafletjs.com/plugins.html#areaoverlay-selection)
  • rectangle
    • https://github.com/kajic/leaflet-locationfilter/
    • https://github.com/heyman/leaflet-areaselect
  • polygon
    • https://github.com/bopen/leaflet-area-selection
  • freeform
    • https://github.com/sandropibia/Leaflet.SelectAreaFeature/
    • https://github.com/zakjan/leaflet-lasso

So, the best solution would be to make objects selection tool as plugin.

Edit: this is actually not new idea: iitc-project/ingress-intel-total-conversion#736 (comment)

[johnd0e]

More links:

• poly-fly-links.user.js
  https://github.com/chrislennon/IITCPlugins -> https://github.com/Seraphli/IITCPlugins
  polygon-portals-list.user.js (unfunctional)
• https://github.com/hayeswise/iitc-portalsinpolygons
• https://gist.github.com/seattletechie/db4cdc748a4a27e655aaf6170cadbb05
  iitc-plugin-count-portals-in-poly.user.js
• https://github.com/dasyak/iitc-plugin-selected-portals-count/blob/master/iitc-plugin-selected-portals-count.user.js
• https://github.com/Jormund/bookmark_under_draw/blob/master/bookmark_under_draw.user.js
• https://github.com/Jormund/poly-counts/blob/master/poly-counts2.user.js
  Display a list of all localized portals by level and faction.
• https://git.depad.fr/ingress-res/iitc-plugins/
  carb.poly-counts.user.js
• https://github.com/Hurqalia/ap_under_draw

[johnd0e]

Proposed interface: L.Evented object.

Methods

• filter(portal): Boolean
• .isEnabled(): Boolean

Events

• 'changed'
• 'enabled', 'disabled'