Example showing contextual data updates in TnT Board. When the board is panned or zoomed, the elements that lay outside the boundaries of the current display are removed and new elements inside the boundaries created. This happens at the data level.
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January 12, 2016 16:26
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Contextual data updates
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| <!DOCTYPE html> | |
| <head> | |
| <link rel="stylesheet" href="http://tntvis.github.io/tnt.board/build/tnt.board.css" type="text/css" /> | |
| <style> | |
| #mydiv { | |
| margin-top: 120px; | |
| } | |
| </style> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://tntvis.github.io/tnt.board/build/tnt.board.min.js"></script> | |
| <script src="updater.js"></script> | |
| </head> | |
| <body> | |
| <div id="mydiv"></div> | |
| <script> | |
| updater(document.getElementById("mydiv")); | |
| </script> | |
| </body> |
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| var updater = function (div) { | |
| var board = tnt.board().from(20).to(500).width(950); | |
| // Axis track | |
| var axis_track = tnt.board.track() | |
| .height(0) | |
| .color("white") | |
| .display(tnt.board.track.feature.axis() | |
| .orientation("top") | |
| ); | |
| // Data track | |
| var pin_track = tnt.board.track() | |
| .height(60) | |
| .color("white") | |
| .display(tnt.board.track.feature.pin() | |
| .index(function (d) { | |
| return d.pos; | |
| }) | |
| .domain([0.3, 1.2]) | |
| .color("red") | |
| ) | |
| .data(tnt.board.track.data.sync() | |
| .retriever (function (loc) { | |
| var from = loc.from; | |
| var to = loc.to; | |
| var elems = []; | |
| var data = pins_data; | |
| for (var i=0; i<data.length; i++) { | |
| if ((data[i].pos > loc.from) && (data[i].pos < loc.to)) { | |
| elems.push(data[i]); | |
| } | |
| } | |
| return elems; | |
| }) | |
| ); | |
| var block_track = tnt.board.track() | |
| .height(20) | |
| .color("white") | |
| .display(tnt.board.track.feature.block() | |
| .index(function (d) { | |
| return d.start; | |
| }) | |
| .color("blue") | |
| ) | |
| .data(tnt.board.track.data.async() | |
| .retriever (function (loc) { | |
| var from = loc.from; | |
| var to = loc.to; | |
| var elems = []; | |
| var data = blocks_data; | |
| for (var i=0; i<data.length; i++) { | |
| var d = data[i]; | |
| if ((d.start > from && d.end < to) || | |
| (d.start > from && d.start < to) || | |
| (d.end > from && d.end < to) || | |
| (d.start < from && d.end > to)) { | |
| elems.push(d); | |
| } | |
| } | |
| return new Promise (function (resolve, reject) { | |
| // console.log(block_track.data().elements()); | |
| resolve (elems); | |
| }); | |
| }) | |
| ); | |
| board | |
| .add_track ([axis_track, pin_track, block_track]); | |
| board(div); | |
| board.start(); | |
| }; | |
| var pins_data = [ | |
| { | |
| pos : 200, | |
| val : 0.5, | |
| label : "1" | |
| }, | |
| { | |
| pos : 355, | |
| val : 0.8, | |
| label : "2" | |
| }, | |
| { | |
| pos : 100, | |
| val : 0.3, | |
| label : "3" | |
| }, | |
| { | |
| pos : 400, | |
| val : 1, | |
| label : "4" | |
| } | |
| ]; | |
| var blocks_data = [ | |
| { | |
| start : 20, | |
| end : 30 | |
| }, | |
| { | |
| start : 100, | |
| end : 150 | |
| }, | |
| { | |
| start : 300, | |
| end : 350 | |
| } | |
| ]; |
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