/* *
 *
 *  (c) 2010-2021 Highsoft AS
 *
 *  License: www.highcharts.com/license
 *
 *  !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
 *
 * */
'use strict';
/* *
 *
 *  Functions
 *
 * */
/**
 * Simple line string clipping. Clip to bounds and insert intersection points.
 * @private
 */
function clipLineString(line, boundsPolygon) {
    const ret = [], l = clipPolygon(line, boundsPolygon, false);
    for (let i = 1; i < l.length; i++) {
        // Insert gap where two intersections follow each other
        if (l[i].isIntersection && l[i - 1].isIntersection) {
            ret.push(l.splice(0, i));
            i = 0;
        }
        // Push the rest
        if (i === l.length - 1) {
            ret.push(l);
        }
    }
    return ret;
}
/**
 * Clip a polygon to another polygon using the Sutherland/Hodgman algorithm.
 * @private
 */
function clipPolygon(subjectPolygon, boundsPolygon, closed = true) {
    let clipEdge1 = boundsPolygon[boundsPolygon.length - 1], clipEdge2, prevPoint, currentPoint, outputList = subjectPolygon;
    for (let j = 0; j < boundsPolygon.length; j++) {
        const inputList = outputList;
        clipEdge2 = boundsPolygon[j];
        outputList = [];
        prevPoint = closed ?
            // Polygon, wrap around
            inputList[inputList.length - 1] :
            // Open line string, don't wrap
            inputList[0];
        for (let i = 0; i < inputList.length; i++) {
            currentPoint = inputList[i];
            if (isInside(clipEdge1, clipEdge2, currentPoint)) {
                if (!isInside(clipEdge1, clipEdge2, prevPoint)) {
                    outputList.push(intersection(clipEdge1, clipEdge2, prevPoint, currentPoint));
                }
                outputList.push(currentPoint);
            }
            else if (isInside(clipEdge1, clipEdge2, prevPoint)) {
                outputList.push(intersection(clipEdge1, clipEdge2, prevPoint, currentPoint));
            }
            prevPoint = currentPoint;
        }
        clipEdge1 = clipEdge2;
    }
    return outputList;
}
/** @private */
function isInside(clipEdge1, clipEdge2, p) {
    return ((clipEdge2[0] - clipEdge1[0]) * (p[1] - clipEdge1[1]) >
        (clipEdge2[1] - clipEdge1[1]) * (p[0] - clipEdge1[0]));
}
/** @private */
function intersection(clipEdge1, clipEdge2, prevPoint, currentPoint) {
    const dc = [
        clipEdge1[0] - clipEdge2[0],
        clipEdge1[1] - clipEdge2[1]
    ], dp = [
        prevPoint[0] - currentPoint[0],
        prevPoint[1] - currentPoint[1]
    ], n1 = clipEdge1[0] * clipEdge2[1] - clipEdge1[1] * clipEdge2[0], n2 = prevPoint[0] * currentPoint[1] - prevPoint[1] * currentPoint[0], n3 = 1 / (dc[0] * dp[1] - dc[1] * dp[0]), intersection = [
        (n1 * dp[0] - n2 * dc[0]) * n3,
        (n1 * dp[1] - n2 * dc[1]) * n3
    ];
    intersection.isIntersection = true;
    return intersection;
}
/* *
 *
 *  Default Export
 *
 * */
const PolygonClip = {
    clipLineString,
    clipPolygon
};
export default PolygonClip;
