Thanks a lot for your answers !
This helped me to solve the problem in the following way:
/**
* Discretize a 2D line with a minimal distance. Start and end
points are part of the returned points.
* @param line 2DLine
* @param minimalDistance Minimal distance between two points
* @return Array of 2D points, with start and end
point of the line
*/
public static Point2D[] Discretize2DLine(Line2D line, double
minimalDistance) {
// Compute the number of steps in order have a minimal distance
int nNumberStep = (int)
Math.ceil(GeometryUtil.Length(line)/minimalDistance);
// Compute the step
double dStep = GeometryUtil.Length(line) / nNumberStep;
// Initialize the returned array
Point2D[] my2DPoint = new Point2D[nNumberStep+1];
// Compute the coordinate with ShapeUtilities module
for (int i = 0; i<= nNumberStep; i++) {
Point2D myPoint = ShapeUtilities.colinearPoint(line,
line.getP1(), dStep*i);
my2DPoint[i] = myPoint;
}
return my2DPoint;
}
Cédric
Martin Desruisseaux wrote:
> Andrea Aime a écrit :
>
>>> I'd like to compute the coordinates of one point every x meters along a
>>> 2D line (example: for a 200m line with a point every 50m, the function
>>> will return the start coordinate, one coordinate after 50 m, on
>>> coordinate after 100m, one coordinate after 150m and one coordinate
>>> after 200m). Is there any appropriate function to do that ?
>>>
>> Sextante has such a process, I guess you can use it in conjuction
>> with GeoTools 2.5.x bindings to read the lines and write out the
>> results.
>>
>
>
> You can do that in GeoTools too, by invoking the following function in a loop:
>
> http://geotidy.geomatys.fr/apidocs/org/geotools/display/shape/ShapeUtilities.html#colinearPoint(java.awt.geom.Line2D,%20java.awt.geom.Point2D,%20double)
>
> (I believe that in GeoTools 2.x, this method was in an internal package, so it
> didn't appear in the javadoc).
>
> Martin
>
>
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Cédric Moullet
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