gamma.js

var data = [
  {"country": "US", "product": "hardware", "amount": 6},
  {"country": "US", "product": "software", "amount": 10},
  {"country": "UK", "product": "hardware", "amount": 11},
  {"country": "UK", "product": "software", "amount": 2},
  {"country": "JP", "product": "hardware", "amount": 4},
  {"country": "JP", "product": "software", "amount": 8}
];

var meta = {
  "country": {
    "type": "nominal",
    "variable": "independent"
  },
  "product": {
    "type": "nominal",
    "variable": "independent"
  },
  "amount": {
    "type": "extensive",
    "variable": "dependent"
  }
};

var blueprint = {
  "meta": meta,
  "visual": "bar",
  "dimensions": {
    "columns": {
      "tabulated": null,
      "visualized": {
        "variable": "country",
        "axis": "horizontal",
        "series": null
      },
      "drilled": null
    },
    "rows": {
      "tabulated": null,
      "visualized": null,
      "drilled": null
    },
  },
  "measures": [
    {
      "variable": "amount",
      "axis": "height",
      "details": {
        "variable": "product",
        "type": "stack"
      }
    }
  ]
};