{"action":"opened","issue":{"url":"https://api.github.com/repos/palantir/plottable/issues/1853","labels_url":"https://api.github.com/repos/palantir/plottable/issues/1853/labels{/name}","comments_url":"https://api.github.com/repos/palantir/plottable/issues/1853/comments","events_url":"https://api.github.com/repos/palantir/plottable/issues/1853/events","html_url":"https://github.com/palantir/plottable/issues/1853","id":69198763,"number":1853,"title":"Support for waterfall charts","user":{"login":"joyt","id":2513424,"avatar_url":"https://avatars.githubusercontent.com/u/2513424?v=3","gravatar_id":"","url":"https://api.github.com/users/joyt","html_url":"https://github.com/joyt","followers_url":"https://api.github.com/users/joyt/followers","following_url":"https://api.github.com/users/joyt/following{/other_user}","gists_url":"https://api.github.com/users/joyt/gists{/gist_id}","starred_url":"https://api.github.com/users/joyt/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/joyt/subscriptions","organizations_url":"https://api.github.com/users/joyt/orgs","repos_url":"https://api.github.com/users/joyt/repos","events_url":"https://api.github.com/users/joyt/events{/privacy}","received_events_url":"https://api.github.com/users/joyt/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-04-17T19:10:20Z","updated_at":"2015-04-17T19:10:20Z","closed_at":null,"body":"Example:\r\n![image](https://cloud.githubusercontent.com/assets/2513424/7208696/9d4902f4-e510-11e4-83fb-5055cf06796c.png)\r\nSeems like the basic data model is one where certain values are base bar values, where as others are just delta values between the base points, e.g. for the above:\r\n```\r\n[\r\n{name: \"Net Sales 2010\", value: 100, type: \"base\"},\r\n{name: \"Price Effect\", value: -10, type: \"delta\"},\r\n{name: \"Price Effect\", value: 15, type: \"delta\"},\r\n...\r\n{name: \"Net Sales 2011\", value: 110, type: \"base\"}\r\n...\r\n]\r\n```\r\nOr the API could be even more general, with just some function you can pass to determines if each data point is a delta or a normal bar?"}}