Large Area

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FAKE(linspace(0,19999,20000))
// |   0
// +-- n
// |         -42109200000000000 = epoch "1968/09/01" and add a day
PUSHVALUE(0, -42109200000000000 + value(0)*3600*24*1000000000)
// |   0              1
// +-- daily-epoch    n
// |         convert from epoch to time
MAPVALUE(0, time(value(0)))
// |   0         1
// +-- time      n
// |         convert time to date string
MAPVALUE(0, strTime(value(0), sqlTimeformat("YYYY/MM/DD"), tz("Local")))
// |   0         1
// +-- date      n
// |         random values
MAPVALUE(1, sin(value(1)/20000 * 3*PI) * 300 + (100*random())+50)
// |   0         1
// +-- date      value
// |   
CHART(
    chartJSCode({
        function position(pt) {
            return [pt[0], '10%'];
        }
        function areaColor() {
            return new echarts.graphic.LinearGradient(0, 0, 0, 1, [
            {
                offset: 0,
                color: 'rgb(255, 158, 68)'
            },
            {
                offset: 1,
                color: 'rgb(255, 70, 131)'
            }
            ]);
        }
    }),
    chartOption({
        tooltip: {
            trigger: "axis",
            position: position
        },
        title: {
            left: "center",
            text: "Large Area Chart"
        },
        toolbox: {
            feature: {
                dataZoom: {
                    yAxisIndex: "none"
                },
                restore: {},
                saveAsImage: {}
            }
        },
        xAxis: {
            type: "category",
            boundaryGap: false,
            data: column(0)
        },
        yAxis: {
            type: "value",
            boundaryGap: [0, "100%"]
        },
        dataZoom: [
            {
                type: "inside",
                start: 0,
                end: 10
            },
            {
                start: 0,
                end: 10
            }
        ],
        series: [
            {
                name: "Fake Data",
                type: "line",
                symbol: "none",
                sampling: "lttb",
                itemStyle: {
                    color: "rgb(255, 70, 131)"
                },
                areaStyle: {
                    color: areaColor()
                },
                data: column(1)
            }
        ]
    })
)