polygon移除一定角度的顶点连接线

polygon移除一定角度的顶点连接线

上文描述了如何求解每个顶点的角度，在此基础上需要将不符合要求的点删除留下的点链接成面即可

测试数据

POLYGON ((290.890041493776 392.188796680498,279.707468879668 191.919087136929,307.155601659751 327.126556016598,363.06846473029 170.570539419087,548.089211618257 237.665975103734,605.01867219917 407.4377593361,493.192946058091 301.711618257261,472.860995850622 232.582987551867,479.977178423236 311.877593360996,290.890041493776 392.188796680498))

流程注解

本次案例使用的角度是30° 两条直线间的距离小于30 删除这个点的连接线

移除30°以后的图像

代码实现

 @Override
    public PolygonAngleResult polygonWktAngleMerge(String wkt, Double angle) throws ParseException {

        PolygonAngleResult polygonAngleResult = polygonWktAngle(wkt);
        polygonAngleResult.setRemoveAngle(angle);

        Polygon oldPolygon = polygonAngleResult.getPolygon();
        Coordinate[] coordinates = oldPolygon.getCoordinates();
        List<HashMap<PointF, Double>> polygonAngles = polygonAngleResult.getPolygonAngles();

        List<Coordinate> collect = Arrays.stream(coordinates).collect(Collectors.toList());

        for (int i = 0; i < polygonAngles.size(); i++) {
            polygonAngles.get(i).forEach(
                    (k,v)->{
                        for (int j = 0; j < collect.size(); j++) {
                            Coordinate   coordinate = new Coordinate(k.x, k.y);
                            if (collect.get(j).equals(coordinate) && (v < 30 || 180 - v < 30)) {

                                collect.remove(coordinate);
                            }
                        }
                    }
            );
        }


        Polygon polygon = new GeometryFactory().createPolygon(createCoordinate(collect));
        polygonAngleResult.setNewPolygon(polygon);


        return polygonAngleResult;
    }


    /**
     * 根据 List collect创建 collect []
     * @param collect List collect
     * @return Coordinate
     */
    private Coordinate[] createCoordinate(List<Coordinate> collect) {
        Coordinate[] coordinates = new Coordinate[collect.size()];

        for (int i = 0; i < collect.size(); i++) {
            coordinates[i] = collect.get(i);
        }
        return coordinates;
    }

可视化

源码

本文代码及可视化代码均放在 gitee 码云上 欢迎star & fork