gallery/link-interaction.js

   1 Gallery.register(
   2   'link-interaction',
   3   {
   4     name: 'Link Interaction',
   5     setup: function(parent) {
   6       parent.innerHTML = [
   7           "<div id='div_g'></div>",
   8           "<b>Zoom:</b>",
   9           "<a href='#' id='hour'>hour</a> ",
  10           "<a href='#' id='day'>day</a> ",
  11           "<a href='#' id='week'>week</a> ",
  12           "<a href='#' id='month'>month</a> ",
  13           "<a href='#' id='full'>full</a> ",
  14           "<b>Pan:</b> ",
  15           "<a href='#' id='left'>left</a> ",
  16           "<a href='#' id='right'>right</a> "].join("\n");
  17     },
  18     run: function() {
  19       var r = [ ];
  20       var base_time = Date.parse("2008/07/01");
  21       var num = 24 * 0.25 * 365;
  22       for (var i = 0; i < num; i++) {
  23         r.push([ new Date(base_time + i * 3600 * 1000),
  24                  i + 50 * (i % 60),        // line
  25                  i * (num - i) * 4.0 / num  // parabola
  26                ]);
  27       }
  28       var orig_range = [ r[0][0].valueOf(), r[r.length - 1][0].valueOf() ];
  29       g = new Dygraph(
  30             document.getElementById("div_g"),
  31             r, {
  32               rollPeriod: 7,
  33               animatedZooms: true,
  34               // errorBars: true,
  35               width: 600,
  36               height: 300,
  37               labels: ["Date", "a", "b"]
  38             }
  39           );
  40
  41       var desired_range = null;
  42       function approach_range() {
  43         if (!desired_range) return;
  44         // go halfway there
  45         var range = g.xAxisRange();
  46         if (Math.abs(desired_range[0] - range[0]) < 60 &&
  47             Math.abs(desired_range[1] - range[1]) < 60) {
  48           g.updateOptions({dateWindow: desired_range});
  49           // (do not set another timeout.)
  50         } else {
  51           var new_range;
  52           new_range = [0.5 * (desired_range[0] + range[0]),
  53                        0.5 * (desired_range[1] + range[1])];
  54           g.updateOptions({dateWindow: new_range});
  55           animate();
  56         }
  57       }
  58       function animate() {
  59         setTimeout(approach_range, 50);
  60       }
  61
  62       var zoom = function(res) {
  63         var w = g.xAxisRange();
  64         desired_range = [ w[0], w[0] + res * 1000 ];
  65         animate();
  66       };
  67
  68       var reset = function() {
  69         desired_range = orig_range;
  70         animate();
  71       };
  72
  73       var pan = function(dir) {
  74         var w = g.xAxisRange();
  75         var scale = w[1] - w[0];
  76         var amount = scale * 0.25 * dir;
  77         desired_range = [ w[0] + amount, w[1] + amount ];
  78         animate();
  79       };
  80
  81       document.getElementById('hour').onclick = function() { zoom(3600); };
  82       document.getElementById('day').onclick = function() { zoom(86400); };
  83       document.getElementById('week').onclick = function() { zoom(604800); };
  84       document.getElementById('month').onclick = function() { zoom(30 * 86400); };
  85       document.getElementById('full').onclick = function() { reset(); };
  86       document.getElementById('left').onclick = function() { pan(-1); };
  87       document.getElementById('right').onclick = function() { pan(+1); };
  88     }
  89   });