scichart/Charting/Visuals/Helpers/labelHelper.js

Fast WebGL JavaScript Charting Library and Framework

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.labelHelper = void 0;
var AnchorPoint_1 = require("../../../types/AnchorPoint");
var LabelPlacement_1 = require("../../../types/LabelPlacement");
var PolarLabelMode_1 = require("../Axis/Polar/types/PolarLabelMode");
function radiansToDegrees(r) {
    return (180 * r) / Math.PI;
}
function normalizeAngle(a) {
    var normalized = a;
    while (normalized < 0) {
        normalized += 2 * Math.PI;
    }
    normalized = normalized % (2 * Math.PI);
    return normalized;
}
/**
 * Calculates label rotation for a polar chart with different label modes
 * @param mode - One of the following polar label modes {@link EPolarLabelMode}
 * @param angle - data point angle in radians
 * @returns an angle in radians to apply for the label when drawing
 */
function getPolarLabelRotation(mode, angle) {
    if (mode === PolarLabelMode_1.EPolarLabelMode.Parallel) {
        var aDeg = Math.round(radiansToDegrees(normalizeAngle(angle)));
        if (aDeg % 360 <= 180) {
            return angle - Math.PI / 2;
        }
        else {
            return angle - (3 * Math.PI) / 2;
        }
    }
    else if (mode === PolarLabelMode_1.EPolarLabelMode.Perpendicular) {
        if (Math.cos(angle) > 0) {
            return angle;
        }
        else {
            return angle - Math.PI;
        }
    }
    return 0;
}
function getLabelPlacementForRadialAxis(radialAxisLabelPlacement) {
    if (radialAxisLabelPlacement === LabelPlacement_1.ERadialAxisLabelPlacement.Top) {
        return AnchorPoint_1.EVerticalAnchorPoint.Bottom;
    }
    else if (radialAxisLabelPlacement === LabelPlacement_1.ERadialAxisLabelPlacement.Bottom) {
        return AnchorPoint_1.EVerticalAnchorPoint.Top;
    }
    else {
        return AnchorPoint_1.EVerticalAnchorPoint.Center;
    }
}
function getHorizontalAnchorPoint(angularAxisLabelPlacement, isInverse) {
    if (angularAxisLabelPlacement === LabelPlacement_1.EAngularAxisLabelPlacement.Outer) {
        return isInverse ? AnchorPoint_1.EHorizontalAnchorPoint.Right : AnchorPoint_1.EHorizontalAnchorPoint.Left;
    }
    else if (angularAxisLabelPlacement === LabelPlacement_1.EAngularAxisLabelPlacement.Inner) {
        return isInverse ? AnchorPoint_1.EHorizontalAnchorPoint.Left : AnchorPoint_1.EHorizontalAnchorPoint.Right;
    }
    else {
        return AnchorPoint_1.EHorizontalAnchorPoint.Center;
    }
}
function getVerticalAnchorPoint(angularAxisLabelPlacement, isInverse) {
    if (angularAxisLabelPlacement === LabelPlacement_1.EAngularAxisLabelPlacement.Outer) {
        return isInverse ? AnchorPoint_1.EVerticalAnchorPoint.Top : AnchorPoint_1.EVerticalAnchorPoint.Bottom;
    }
    else if (angularAxisLabelPlacement === LabelPlacement_1.EAngularAxisLabelPlacement.Inner) {
        return isInverse ? AnchorPoint_1.EVerticalAnchorPoint.Bottom : AnchorPoint_1.EVerticalAnchorPoint.Top;
    }
    else {
        return AnchorPoint_1.EVerticalAnchorPoint.Center;
    }
}
function getLabelRotationAndPlacementForAngularAxis(radians, labelMode, angularAxisLabelPlacement) {
    if (labelMode === PolarLabelMode_1.EPolarLabelMode.Parallel) {
        var angleInDegrees = exports.labelHelper.radiansToDegrees(Math.PI / 2 - radians);
        var isInverse = angleInDegrees < -90;
        return {
            resultAngle: isInverse ? angleInDegrees + 180 : angleInDegrees,
            horizontalAnchorPoint: AnchorPoint_1.EHorizontalAnchorPoint.Center,
            verticalAnchorPoint: getVerticalAnchorPoint(angularAxisLabelPlacement, isInverse)
        };
    }
    else if (labelMode === PolarLabelMode_1.EPolarLabelMode.Perpendicular) {
        var angleInDegrees = exports.labelHelper.radiansToDegrees(-radians);
        var isInverse = angleInDegrees < -90 && angleInDegrees > -270;
        return {
            resultAngle: isInverse ? angleInDegrees + 180 : angleInDegrees,
            horizontalAnchorPoint: getHorizontalAnchorPoint(angularAxisLabelPlacement, isInverse),
            verticalAnchorPoint: AnchorPoint_1.EVerticalAnchorPoint.Center
        };
    }
    return {
        resultAngle: 0,
        horizontalAnchorPoint: AnchorPoint_1.EHorizontalAnchorPoint.Center,
        verticalAnchorPoint: AnchorPoint_1.EVerticalAnchorPoint.Center
    };
}
exports.labelHelper = {
    getPolarLabelRotation: getPolarLabelRotation,
    radiansToDegrees: radiansToDegrees,
    getLabelPlacementForRadialAxis: getLabelPlacementForRadialAxis,
    getLabelRotationAndPlacementForAngularAxis: getLabelRotationAndPlacementForAngularAxis,
    normalizeAngle: normalizeAngle
};