task manager tasks heatmap in vega-lite (baby steps)

task-manager-tasks-heatmap.json

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "description": "task manager tasks",
  "data": {"values": [
    {"worker": 0, "begin": 0, "duration": 1, "type": "i" },
    {"worker": 0, "begin": 3, "duration": 1, "type": "i"  },
    {"worker": 0, "begin": 6, "duration": 1, "type": "i"  },
    {"worker": 0, "begin": 9, "duration": 1, "type": "i"  },
    {"worker": 1, "begin": 0, "duration": 4, "type": "o"  },
    {"worker": 1, "begin": 6, "duration": 2, "type": "s"  }
  ]},
  "mark": "rect",
  "encoding": {
    "x": {
      "bin": {},
      "field": "begin",
      "type": "ordinal"
    },
    "y": {
      "bin": {"maxbins": 10},
      "field": "worker",
      "type": "ordinal"
    },
    "color": {"field": "type"}
  }}