Extension:Graph/Interactive Graph Tutorial/1

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<graph mode=interactive>
{
  // We want to use Vega 2, and specify image size
  "version": 2, "width": 300, "height": 80,
  // Set padding to the same value on all sides
  "padding": 12,
  // By default the background is transparent
  "background": "#edf1f7",
  "marks": [
    {
      // Draw a horizontal line
      "name": "scrollLine",
      "type": "rule",
      "properties": {
        "enter": {
          "x": {"value": 0},
          "y": {"value": 40},
          "x2": {"value": 300},
          "stroke": {"value": "#000"},
          "strokeWidth": {"value": 2}
        }
      }
    },
    {
      // Draw a triangle shape with a hover effect
      // naming objects allows us to reference them later
      "name": "handle",
      "type": "path",
      "properties": {
        "enter": {
          "x": {"value": 200},
          "y": {"value": 40},
          // path syntax is the same as SVG's path tag
          "path": {"value": "m-5.5,-10l0,20l11.5,-10l-11.5,-10z"},
          "stroke": {"value": "#880"},
          "strokeWidth": {"value": 2.5}
        },
        "update": {"fill": {"value": "#fff"} },
        // Change fill color of the object on mouse hover
        "hover": {"fill": {"value": "#f00"} }
      }
    }
  ]
}
</graph>