{"action":"created","issue":{"url":"https://api.github.com/repos/phetsims/gravity-and-orbits/issues/207","repository_url":"https://api.github.com/repos/phetsims/gravity-and-orbits","labels_url":"https://api.github.com/repos/phetsims/gravity-and-orbits/issues/207/labels{/name}","comments_url":"https://api.github.com/repos/phetsims/gravity-and-orbits/issues/207/comments","events_url":"https://api.github.com/repos/phetsims/gravity-and-orbits/issues/207/events","html_url":"https://github.com/phetsims/gravity-and-orbits/issues/207","id":171781757,"number":207,"title":"Planet trace does not move at same speed as planet","user":{"login":"jessegreenberg","id":6396244,"avatar_url":"https://avatars.githubusercontent.com/u/6396244?v=3","gravatar_id":"","url":"https://api.github.com/users/jessegreenberg","html_url":"https://github.com/jessegreenberg","followers_url":"https://api.github.com/users/jessegreenberg/followers","following_url":"https://api.github.com/users/jessegreenberg/following{/other_user}","gists_url":"https://api.github.com/users/jessegreenberg/gists{/gist_id}","starred_url":"https://api.github.com/users/jessegreenberg/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jessegreenberg/subscriptions","organizations_url":"https://api.github.com/users/jessegreenberg/orgs","repos_url":"https://api.github.com/users/jessegreenberg/repos","events_url":"https://api.github.com/users/jessegreenberg/events{/privacy}","received_events_url":"https://api.github.com/users/jessegreenberg/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/phetsims/gravity-and-orbits/labels/type:question","name":"type:question","color":"EDCB62"}],"state":"open","locked":false,"assignee":{"login":"arouinfar","id":8419308,"avatar_url":"https://avatars.githubusercontent.com/u/8419308?v=3","gravatar_id":"","url":"https://api.github.com/users/arouinfar","html_url":"https://github.com/arouinfar","followers_url":"https://api.github.com/users/arouinfar/followers","following_url":"https://api.github.com/users/arouinfar/following{/other_user}","gists_url":"https://api.github.com/users/arouinfar/gists{/gist_id}","starred_url":"https://api.github.com/users/arouinfar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/arouinfar/subscriptions","organizations_url":"https://api.github.com/users/arouinfar/orgs","repos_url":"https://api.github.com/users/arouinfar/repos","events_url":"https://api.github.com/users/arouinfar/events{/privacy}","received_events_url":"https://api.github.com/users/arouinfar/received_events","type":"User","site_admin":false},"assignees":[{"login":"arouinfar","id":8419308,"avatar_url":"https://avatars.githubusercontent.com/u/8419308?v=3","gravatar_id":"","url":"https://api.github.com/users/arouinfar","html_url":"https://github.com/arouinfar","followers_url":"https://api.github.com/users/arouinfar/followers","following_url":"https://api.github.com/users/arouinfar/following{/other_user}","gists_url":"https://api.github.com/users/arouinfar/gists{/gist_id}","starred_url":"https://api.github.com/users/arouinfar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/arouinfar/subscriptions","organizations_url":"https://api.github.com/users/arouinfar/orgs","repos_url":"https://api.github.com/users/arouinfar/repos","events_url":"https://api.github.com/users/arouinfar/events{/privacy}","received_events_url":"https://api.github.com/users/arouinfar/received_events","type":"User","site_admin":false}],"milestone":null,"comments":5,"created_at":"2016-08-17T23:07:45Z","updated_at":"2016-08-19T18:49:33Z","closed_at":null,"body":"I am not sure if this is a bug or if this is intentional.  It seems that the path trace for the planet will move at the speed of the planet when it was in that position in the trace, not at the current speed of the planet.  This can lead to some interesting cases.  One example is shown below.\r\n\r\n\r\n![recording 18](https://cloud.githubusercontent.com/assets/6396244/17756425/fded26aa-649c-11e6-8346-4682617b7791.gif)\r\n\r\n@arouinfar can you please verify that this is the desired behavior?"},"comment":{"url":"https://api.github.com/repos/phetsims/gravity-and-orbits/issues/comments/241103098","html_url":"https://github.com/phetsims/gravity-and-orbits/issues/207#issuecomment-241103098","issue_url":"https://api.github.com/repos/phetsims/gravity-and-orbits/issues/207","id":241103098,"user":{"login":"arouinfar","id":8419308,"avatar_url":"https://avatars.githubusercontent.com/u/8419308?v=3","gravatar_id":"","url":"https://api.github.com/users/arouinfar","html_url":"https://github.com/arouinfar","followers_url":"https://api.github.com/users/arouinfar/followers","following_url":"https://api.github.com/users/arouinfar/following{/other_user}","gists_url":"https://api.github.com/users/arouinfar/gists{/gist_id}","starred_url":"https://api.github.com/users/arouinfar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/arouinfar/subscriptions","organizations_url":"https://api.github.com/users/arouinfar/orgs","repos_url":"https://api.github.com/users/arouinfar/repos","events_url":"https://api.github.com/users/arouinfar/events{/privacy}","received_events_url":"https://api.github.com/users/arouinfar/received_events","type":"User","site_admin":false},"created_at":"2016-08-19T18:49:32Z","updated_at":"2016-08-19T18:49:32Z","body":"> So I think it is a more appropriate visual effect if it gives the \"this is where I came from idea\". \r\n\r\nGood point @ariel-phet.  I think we want to keep the trace long enough to determine determine the shape of an orbit, and it looks like the trace at normal speed falls in the 75-85% range for each system.\r\n\r\n<img src=\"https://cloud.githubusercontent.com/assets/8419308/17820376/c464f976-6609-11e6-93b9-90f72fb3b431.png\", width=\"250px\">  <img src = \"https://cloud.githubusercontent.com/assets/8419308/17820453/2ff008f2-660a-11e6-9370-33fbef75679b.png\" width=\"250px\"> <img src=\"https://cloud.githubusercontent.com/assets/8419308/17820568/a93ac6b6-660a-11e6-8f07-cb95ddee9dff.png\" width=\"250px\">\r\n\r\n@ariel-phet can you think of any reason why we wouldn't want the trace length to be constant across playback speeds? The variance of trace length can create some strange situations, like the one in @jessegreenberg original post.\r\n"}}
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