[
  {
    "id": "rectangle",
    "points": [
      [
        0,
        0
      ],
      [
        40,
        0
      ],
      [
        40,
        20
      ],
      [
        0,
        20
      ]
    ],
    "width": 40,
    "height": 2
  },
  {
    "id": "triangle",
    "points": [
      [
        0,
        0
      ],
      [
        30,
        0
      ],
      [
        15,
        20
      ]
    ],
    "width": 30,
    "height": 3
  },
  {
    "id": "chamfered-plate",
    "points": [
      [
        5,
        0
      ],
      [
        35,
        0
      ],
      [
        40,
        5
      ],
      [
        40,
        15
      ],
      [
        35,
        20
      ],
      [
        5,
        20
      ],
      [
        0,
        15
      ],
      [
        0,
        5
      ]
    ],
    "width": 40,
    "height": 2
  }
]