@nativescript-community/ui-chart/highlight/RadarHighlighter.js

A powerful chart / graph plugin, supporting line, bar, pie, radar, bubble, and candlestick charts as well as scaling, panning and animations.

import { Utils } from '../utils/Utils';
import { PieRadarHighlighter } from './PieRadarHighlighter';
/**
 * Created by philipp on 12/06/16.
 */
export class RadarHighlighter extends PieRadarHighlighter {
    getClosestHighlight(index, x, y) {
        const highlights = this.getHighlightsAtIndex(index);
        const distanceToCenter = this.mChart.distanceToCenter(x, y) / this.mChart.factor;
        let closest = null;
        let distance = Infinity;
        for (let i = 0; i < highlights.length; i++) {
            const high = highlights[i];
            // const set = this.mChart.data.getDataSetByIndex(high.dataSetIndex);
            // const yProperty = set.yProperty;
            const cdistance = Math.abs(high.y - distanceToCenter);
            if (cdistance < distance) {
                closest = high;
                distance = cdistance;
            }
        }
        return closest;
    }
    /**
     * Returns an array of Highlight objects for the given index. The Highlight
     * objects give information about the value at the selected index and the
     * DataSet it belongs to. INFORMATION: This method does calculations at
     * runtime. Do not over-use in performance critical situations.
     *
     * @param index
     * @return
     */
    getHighlightsAtIndex(index) {
        this.mHighlightBuffer = [];
        const phaseX = this.mChart.animator.phaseX;
        const phaseY = this.mChart.animator.phaseY;
        const sliceangle = this.mChart.sliceAngle;
        const factor = this.mChart.factor;
        const pOut = { x: 0, y: 0 };
        for (let i = 0; i < this.mChart.data.dataSetCount; i++) {
            const dataSet = this.mChart.data.getDataSetByIndex(i);
            const yKey = dataSet.yProperty;
            const entry = dataSet.getEntryForIndex(index);
            const y = entry[yKey] - this.mChart.yChartMin;
            Utils.getPosition(this.mChart.centerOffsets, y * factor * phaseY, sliceangle * index * phaseX + this.mChart.rotationAngle, pOut);
            this.mHighlightBuffer.push({
                entry,
                x: index,
                y: entry[yKey],
                xPx: pOut.x,
                yPx: pOut.y,
                dataSetIndex: i,
                axis: dataSet.axisDependency
            });
        }
        return this.mHighlightBuffer;
    }
}
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