Function getLabelPosition

src/component/axisPointer/PolarAxisPointer.ts:94–140

(
    value: ScaleDataValue,
    axisModel: PolarAxisModel,
    axisPointerModel: AxisPointerModel,
    polar: Polar,
    labelMargin: number
)

};

function getLabelPosition(
    value: ScaleDataValue,
    axisModel: PolarAxisModel,
    axisPointerModel: AxisPointerModel,
    polar: Polar,
    labelMargin: number
) {
    const axis = axisModel.axis;
    const coord = axis.dataToCoord(value);
    let axisAngle = polar.getAngleAxis().getExtent()[0];
    axisAngle = axisAngle / 180 * Math.PI;
    const radiusExtent = polar.getRadiusAxis().getExtent();
    let position;
    let align: ZRTextAlign;
    let verticalAlign: ZRTextVerticalAlign;

    if (axis.dim === 'radius') {
        const transform = matrix.create();
        matrix.rotate(transform, transform, axisAngle);
        matrix.translate(transform, transform, [polar.cx, polar.cy]);
        position = graphic.applyTransform([coord, -labelMargin], transform);

        const labelRotation = axisModel.getModel('axisLabel').get('rotate') || 0;
        // @ts-ignore
        const labelLayout = AxisBuilder.innerTextLayout(
            axisAngle, labelRotation * Math.PI / 180, -1
        );
        align = labelLayout.textAlign;
        verticalAlign = labelLayout.textVerticalAlign;
    }
    else { // angle axis
        const r = radiusExtent[1];
        position = polar.coordToPoint([r + labelMargin, coord]);
        const cx = polar.cx;
        const cy = polar.cy;
        align = Math.abs(position[0] - cx) / r < 0.3
            ? 'center' : (position[0] > cx ? 'left' : 'right');
        verticalAlign = Math.abs(position[1] - cy) / r < 0.3
            ? 'middle' : (position[1] > cy ? 'top' : 'bottom');
    }

    return {
        position: position,
        align: align,
        verticalAlign: verticalAlign
    };
}


const pointerShapeBuilder = {