FlatBottomChannelAnnotation

FlatBottomChannelAnnotation📘 normalizes the lower edge so both bottom points share the same y-value. Parallelism is no longer maintained, but the bottom edge is guaranteed to be flat.

const {
    NumberRange,
    NumericAxis,
    SciChartSurface,
    EVerticalTextPosition
} = SciChart; // or import from "scichart"
const {
    FlatBottomChannelAnnotation,
    EAnnotationVisibilityMode,
    EMultiPointLabelAnchorMode,
    SciTraderLightTheme
} = SciChartFinancialTools; // if using npm, import from "scichart-financial-tools";

const { wasmContext, sciChartSurface } = await SciChartSurface.create(divElementId, {
    theme: new SciTraderLightTheme()
});

sciChartSurface.xAxes.add(new NumericAxis(wasmContext, { visibleRange: new NumberRange(0, 50) }));
sciChartSurface.yAxes.add(new NumericAxis(wasmContext, { visibleRange: new NumberRange(20, 90) }));

sciChartSurface.annotations.add(
    new FlatBottomChannelAnnotation({
        // First two points define one channel edge; the third point defines the offset.
        points: [
            { x: 8, y: 60 },
            { x: 42, y: 80 },
            { x: 42, y: 50 },
        ],
        stroke: "#FF8833",
        fill: "#FF883333",
        showMidLine: false,
        showMidPointGrips: true,

        // other properties:
        isEditable: true,
        isSelected: true,
        labels: [
            // Segment labels can name each edge independently.
            {
                anchorMode: EMultiPointLabelAnchorMode.Segment,
                verticalTextPosition: EVerticalTextPosition.Above,
                segmentStartIndex: 0,
                segmentEndIndex: 1,
                segmentRatio: 0.5,
                text: "Resistance"
            },
            {
                anchorMode: EMultiPointLabelAnchorMode.Segment,
                verticalTextPosition: EVerticalTextPosition.Below,
                segmentStartIndex: 2,
                segmentEndIndex: 3,
                segmentRatio: 0.5,
                text: "Support"
            }
        ],
        segmentLabelVisibility: EAnnotationVisibilityMode.Always
    })
);

Use this variant when the channel needs a fixed support level and a sloped upper boundary.

See Also​

See Also