{"action":"created","issue":{"url":"https://api.github.com/repos/phetsims/charges-and-fields/issues/46","labels_url":"https://api.github.com/repos/phetsims/charges-and-fields/issues/46/labels{/name}","comments_url":"https://api.github.com/repos/phetsims/charges-and-fields/issues/46/comments","events_url":"https://api.github.com/repos/phetsims/charges-and-fields/issues/46/events","html_url":"https://github.com/phetsims/charges-and-fields/issues/46","id":90440252,"number":46,"title":"Completely overlapped charges still display E-field with direction only selected","user":{"login":"orejolaphet","id":5631059,"avatar_url":"https://avatars.githubusercontent.com/u/5631059?v=3","gravatar_id":"","url":"https://api.github.com/users/orejolaphet","html_url":"https://github.com/orejolaphet","followers_url":"https://api.github.com/users/orejolaphet/followers","following_url":"https://api.github.com/users/orejolaphet/following{/other_user}","gists_url":"https://api.github.com/users/orejolaphet/gists{/gist_id}","starred_url":"https://api.github.com/users/orejolaphet/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/orejolaphet/subscriptions","organizations_url":"https://api.github.com/users/orejolaphet/orgs","repos_url":"https://api.github.com/users/orejolaphet/repos","events_url":"https://api.github.com/users/orejolaphet/events{/privacy}","received_events_url":"https://api.github.com/users/orejolaphet/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/phetsims/charges-and-fields/labels/bug","name":"bug","color":"fc2929"}],"state":"open","locked":false,"assignee":{"login":"bereaphysics","id":7633344,"avatar_url":"https://avatars.githubusercontent.com/u/7633344?v=3","gravatar_id":"","url":"https://api.github.com/users/bereaphysics","html_url":"https://github.com/bereaphysics","followers_url":"https://api.github.com/users/bereaphysics/followers","following_url":"https://api.github.com/users/bereaphysics/following{/other_user}","gists_url":"https://api.github.com/users/bereaphysics/gists{/gist_id}","starred_url":"https://api.github.com/users/bereaphysics/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bereaphysics/subscriptions","organizations_url":"https://api.github.com/users/bereaphysics/orgs","repos_url":"https://api.github.com/users/bereaphysics/repos","events_url":"https://api.github.com/users/bereaphysics/events{/privacy}","received_events_url":"https://api.github.com/users/bereaphysics/received_events","type":"User","site_admin":false},"milestone":null,"comments":10,"created_at":"2015-06-23T17:07:21Z","updated_at":"2015-07-01T18:15:42Z","closed_at":null,"body":"Partially a question @ariel-phet, but I don't think the E-field direction should be displayed when the net charge at a point is zero.  Isn't the E-field explicitly zero?\r\n\r\nTo reproduce just overlap two charges\r\n\r\nWith out only direction selected the magnitude of the vectors are zero. No E-field is seen\r\n![efield1](https://cloud.githubusercontent.com/assets/5631059/8312042/b5106222-1997-11e5-8254-3b0955306f4c.png)\r\n\r\nWith only direction selected\r\n![efield2](https://cloud.githubusercontent.com/assets/5631059/8312045/b87670e6-1997-11e5-8fd8-ead82d0d91c3.png)\r\n"},"comment":{"url":"https://api.github.com/repos/phetsims/charges-and-fields/issues/comments/117779272","html_url":"https://github.com/phetsims/charges-and-fields/issues/46#issuecomment-117779272","issue_url":"https://api.github.com/repos/phetsims/charges-and-fields/issues/46","id":117779272,"user":{"login":"bereaphysics","id":7633344,"avatar_url":"https://avatars.githubusercontent.com/u/7633344?v=3","gravatar_id":"","url":"https://api.github.com/users/bereaphysics","html_url":"https://github.com/bereaphysics","followers_url":"https://api.github.com/users/bereaphysics/followers","following_url":"https://api.github.com/users/bereaphysics/following{/other_user}","gists_url":"https://api.github.com/users/bereaphysics/gists{/gist_id}","starred_url":"https://api.github.com/users/bereaphysics/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bereaphysics/subscriptions","organizations_url":"https://api.github.com/users/bereaphysics/orgs","repos_url":"https://api.github.com/users/bereaphysics/repos","events_url":"https://api.github.com/users/bereaphysics/events{/privacy}","received_events_url":"https://api.github.com/users/bereaphysics/received_events","type":"User","site_admin":false},"created_at":"2015-07-01T18:15:42Z","updated_at":"2015-07-01T18:15:42Z","body":"Once release candidate 3 is pushed this will be available for testing. The current approach does not take into account edge cases where the charges are almost but not quite on top of another. It would be possible to introduce an equalsEpsilon instead if it proves to be necessary,"}}