Function cutPolylineByGrid

docs/app/js/sanddance-app.js:102264–102304

(positions, options)

var _lineclip = require("./lineclip");
var _utils = require("./utils");
function cutPolylineByGrid(positions, options) {
    const { size =2 , broken =false , gridResolution =10 , gridOffset =[
        0,
        0
    ] , startIndex =0 , endIndex =positions.length  } = options || {};
    const numPoints = (endIndex - startIndex) / size;
    let part = [];
    const result = [
        part
    ];
    const a = (0, _utils.getPointAtIndex)(positions, 0, size, startIndex);
    let b;
    let codeB;
    const cell = getGridCell(a, gridResolution, gridOffset, []);
    const scratchPoint = [];
    (0, _utils.push)(part, a);
    for(let i = 1; i < numPoints; i++){
        b = (0, _utils.getPointAtIndex)(positions, i, size, startIndex, b);
        codeB = (0, _lineclip.bitCode)(b, cell);
        while(codeB){
            (0, _lineclip.intersect)(a, b, codeB, cell, scratchPoint);
            const codeAlt = (0, _lineclip.bitCode)(scratchPoint, cell);
            if (codeAlt) {
                (0, _lineclip.intersect)(a, scratchPoint, codeAlt, cell, scratchPoint);
                codeB = codeAlt;
            }
            (0, _utils.push)(part, scratchPoint);
            (0, _utils.copy)(a, scratchPoint);
            moveToNeighborCell(cell, gridResolution, codeB);
            if (broken && part.length > size) {
                part = [];
                result.push(part);
                (0, _utils.push)(part, a);
            }
            codeB = (0, _lineclip.bitCode)(b, cell);
        }
        (0, _utils.push)(part, b);
        (0, _utils.copy)(a, b);
    }
    return broken ? result : result[0];
}
const TYPE_INSIDE = 0;
const TYPE_BORDER = 1;
function concatInPlace(arr1, arr2) {