如何使用javafx以多维数组为参数绘制多边形

Question

I'm trying to draw maps from a series of coordinates which are multidimensional arrays with javafx Polygons.

It works perfectly with only one simple array:

Polygon polygon = new Polygon();
polygon.getPoints().addAll(new Double[] { 1.0, 1.0, 1.0, 2.0, 2.0, 2.0, 2.0, 1.0, 1.0, 1.0 });

But not with an array from arrays. The coordinates look for example like this:

http://polygons.openstreetmap.fr/get_geojson.py?id=62428&params=0

I've been researching all morning but haven't found a useful solution. Any help would be really appreciated

Answer 1

The JavaFX polygon only supports a single contour, so for multiple contours you need to create an array of polygons and loop over it, for example:

ArrayList<Polygon> polygons = new ArrrayList<Polygon>;
...
for (double [] region : regionArray) {
    Polygon polygon = new Polygon();
    polygon.getPoints().addAll(region);
    polygons.add(polygon);
 }

The tricky part will be handling polygons inside other polygons because these should probably appear as 'holes'. But I think that JavaFX can take care of that if you use the right settings for drawing.