So it sounds like the input points are not necessarily precisely at
vertices. In this case either LengthIndexedLine or LocationIndexedLine can
be used.
Note that each of these has a project(Coordinate) method, which might
eliminate the need to call DistanceOp.nearestPoints.
On Wed, Jul 2, 2014 at 1:48 PM, André Salvati <[email protected]>
wrote:
> I'm trying to segment a bus line by their bus stops.
>
> It works this way:
>
> 1) user gives me 2 points (don't know if they belong to the LineString).
> 2) code gets the LineString nearest point for each of them with
> DistanceOp.nearestPoints(lineString, point). Now I'm sure that they are at
> least near the LineString.
> 3) Cut the segment delimited by these nearest points (as a new LineString).
>
> So, in the beginning I said incorrectly "2 points inside the last one".
> The correct would be: "2 points near the LineString".
>
> Do you think LocationIndexedLine would be more appropriate??
>
>
>
>
> 2014-07-02 17:34 GMT-03:00 Martin Davis <[email protected]>:
>
> It might better to use LocationIndexedLine for this - it uses exact vertex
>> indices for locations, rather than computed lengths. That makes it more
>> precise when you are working directly with vertex indices.
>>
>>
>> On Wed, Jul 2, 2014 at 12:20 PM, André Salvati <[email protected]
>> > wrote:
>>
>>> Very simple implementation where "line" is a LineString.
>>>
>>> Thanks Martin.
>>>
>>> LengthIndexedLine l_i = new LengthIndexedLine(line);
>>> Coordinate[] csSeg = l_i.extractLine(l_i.indexOf(cInicio),
>>> l_i.indexOf(cFim)).getCoordinates();
>>>
>>>
>>>
>>> 2014-07-02 14:47 GMT-03:00 Martin Davis <[email protected]>:
>>>
>>>> Look into the Linear Referencing API:
>>>> http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/linearref/package-frame.html
>>>>
>>>>
>>>>
>>>>
>>>> On Tue, Jul 1, 2014 at 10:00 AM, André Salvati <
>>>> [email protected]> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> 1) is there a function to extract a segment (LineString) from a bigger
>>>>> LineString given 2 points inside the last one?
>>>>>
>>>>> 2) I also would like to get the size of the obtained segment. Is it
>>>>> possible?
>>>>>
>>>>> Thanks.
>>>>>
>>>>>
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>>>>
>>>
>>
>
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