背景

通过一堆点，线上的点或者靠近线的点，来截取线段，将线段截取成多段

代码片段

/**
     * 通过点截取线，点可以是线上的形状点也可以是靠近线的点
     *
     * 线　------------------------------------------
     * 点　.        .     .      .       .           .
     *
     * 截取完的线段:
     *    .---------.-----.------.-------.-----------.
     *
     */
    public static List<Geometry> subLineUseCoordinates(Geometry lineString, Coordinate[] coordinates){

        List<LinearLocation> linearLocations = new ArrayList<>();

        LocationIndexedLine locationIndexedLine = new LocationIndexedLine(lineString);

        LinearLocation startIndex = locationIndexedLine.getStartIndex();
        LinearLocation endIndex = locationIndexedLine.getEndIndex();

        //加入线的收尾 偏移量
        linearLocations.add(startIndex);
        linearLocations.add(endIndex);

        //加入点的偏移量
        for (Coordinate coordinate : coordinates) {
            LinearLocation indexOfCoordinate = locationIndexedLine.indexOf(coordinate);
            linearLocations.add(indexOfCoordinate);
        }

        //排序
        linearLocations.sort(Comparator.comparingDouble(e-> e.getSegmentIndex()+e.getSegmentFraction()));

        List<Geometry> subGeos = new ArrayList<>();

        //截取
        for (int i= 0; i < linearLocations.size(); i++) {
            int next = i+1;
            if(next >= linearLocations.size()){
                break;
            }
            LinearLocation currentLinear = linearLocations.get(i);
            LinearLocation nextLinear = linearLocations.get(next);

            subGeos.add(locationIndexedLine.extractLine(currentLinear, nextLinear));
        }

        return subGeos;

    }