fill-radar-boundary-origin-spline.json

{
    "config": {
        "type": "radar",
        "data": {
            "labels": ["0", "1", "2", "3", "4", "5", "6", "7", "8"],
            "datasets": [{
                "backgroundColor": "rgba(0, 0, 192, 0.25)",
                "data": [null, null, 2, 4, 2, 1, -1, 1, 2]
            }, {
                "backgroundColor": "rgba(0, 192, 0, 0.25)",
                "data": [4, 2, null, 3, 2.5, null, -2, 1.5, 3]
            }, {
                "backgroundColor": "rgba(192, 0, 0, 0.25)",
                "data": [3.5, 2, 1, 2.5, -2, 3, -1, null, null]
            }, {
                "backgroundColor": "rgba(128, 0, 128, 0.25)",
                "data": [5, 6, 5, -2, -4, -3, 4, 2, 4.5]
            }]
        },
        "options": {
            "responsive": false,
            "legend": false,
            "title": false,
            "scale": {
                "display": false
            },
            "elements": {
                "point": {
                    "radius": 0
                },
                "line": {
                    "borderColor": "transparent",
                    "tension": 0.5,
                    "fill": "origin"
                }
            }
        }
    },
    "options": {
        "canvas": {
            "height": 256,
            "width": 256
        }
    }
}