it needs an array of holes, even if it's only one hole.. try (not compile
tested)
GeometryFactory gf = new GeometryFactory();
LinearRing hole = gf.createLinearRing(new Coordinate[] {
new Coordinate(0D, 0D),
new Coordinate(0D, 2D),
new Coordinate(2D, 2D),
new Coordinate(2D, 0D),
new Coordinate(0D, 0D) });
LinearRing shell = gf.createLinearRing(new Coordinate[] {
new Coordinate(0D, 0D),
new Coordinate(0D, 4D),
new Coordinate(4D, 4D),
new Coordinate(4D, 0D),
new Coordinate(0D, 0D) });
Polygon p = gf.createPolygon( shell, new LinearRing[]{ hole });
not that i didn't reverse the direction (coord order) of the hole. there was
some rule that shells run clockwise and holes anti-clockwise, or the other way
around. you probably know that better than me.
..ede
On 12.02.2016 16:58, Giuseppe Aruta wrote:
> Yes,
> but I don't know to use is the parameter LinearRing[] holes.
> Do you know a sample?
>
> 2016-02-12 16:51 GMT+01:00 <[email protected]>:
>
>> did you try GeometryFactory's
>>
>> createPolygon(LinearRing shell, LinearRing[] holes)
>>
>>
>> http://www.vividsolutions.com/jts/javadoc/com/vividsolutions/jts/geom/GeometryFactory.html#createPolygon%28com.vividsolutions.jts.geom.LinearRing,%20com.vividsolutions.jts.geom.LinearRing[]%29
>>
>> already?
>>
>> ..ede
>>
>> On 12.02.2016 16:47, Giuseppe Aruta wrote:
>>> Hi list,
>>> I need a help.
>>> I am trying to develop some tools that automatically draw a shape
>> (polygon)
>>> on the workbench view. I want to use to automatize some shape drawing
>>> whenever I know that I have to transfer a gis file to cad (for instance
>> to
>>> create blocks)
>>>
>>> I was likely able to draw simple shapes, for instance:
>>> a polygon((0 0, 0 4, 4 4, 4 0, 0 0) (4*4 dimension) needs a simple code
>>> like:
>>> new GeometryFactory().createLinearRing(
>>> new Coordinate[] {
>>> new Coordinate(0D, 0D),
>>> new Coordinate(0D, 4D),
>>> new Coordinate(4D, 4D),
>>> new Coordinate(4D, 0D),
>>> new Coordinate(0D, 0D) }),
>>> * nul*l);
>>>
>>> But I found some difficulties when I want to draw a polygon with one or
>>> more hole,
>>> hpw can I handle the parameter *null* (LinearRing[]) on the previous
>> code?
>>> For instance, how can I draw a polygon of 4*4 with 2*2 hole in the
>> middle?
>>> I didn't find any example.
>>> Thank you in advance for the answer
>>> Peppe
>>>
>>>
>>>
>>>
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>
>
>
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