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  1. #1
    minaise is offline Member
    Join Date
    Oct 2013
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    Default creating lines in Java


    I`m completely new to Java and in big trouble with the following exercise.
    Using JTS Topology Suite and Eclipse, I`m supposed to run a certain program to create 3 lines (LineString; a, b, c) with the coordinates (x,y) and as a result to find out which lines intersect the first line a.

    This is what have:

    Java Code:
    import com.vividsolutions.jts.geom.*;
    public class NewProj {
    public static void main(String[] args){
    if (args.length % 2 == 1) {
    else {
    int i=0;
    // Create a new empty array of coordinates.
    I don`t know how I could create three separate lines, each line a, b and c has 3 pairs of x,y coordinates. I think here I am creating just one big line with all the coordinates. 
    Coordinate[] coordinates  =  new Coordinate[] {
    new Coordinate(x, y), new Coordinate(x, y), new Coordinate(x, y), 
    new Coordinate(x, y), new Coordinate(x, y), new Coordinate(x, y),
    new Coordinate(x, y), new Coordinate(x, y), new Coordinate(x, y),
    while (i < args.length) {
    double x = Double.parseDouble(args[i]);
    double y = Double.parseDouble(args[i+1]);
    Coordinate newCoord = new Coordinate(x,y);
    coordinates[i/2] = newCoord;
    // System.out.println(newCoord.toString());    
    } // while
    // Create a new Geometry from the array of coordinates. 
    If understand correctly this is the command that is actually taking x,y coordinates from above and joining it for a line, right?
    Since I`m supposed to have 3 lines, should I amend it or copy 3x somehow? 
    LineString line = new GeometryFactory().createLineString(coordinates);
    Point startPoint = line.getStartPoint();
    Point endPoint = line.getEndPoint();
    // What do I have to write here to find out which lines intersect line a? 
    System.out.println("Answer" + ..................());		  
    	} // else
      } //main	
    Any help much appreciated!!!
    Last edited by minaise; 10-28-2013 at 08:57 PM.

  2. #2
    Tolls is offline Moderator
    Join Date
    Apr 2009
    Rep Power

    Default Re: creating lines in Java

    When posting code please wrap it in [code] tags [/code].

    And also show what the problem is (and if it's in that awful light blue then you need to remove the colour tags, as that's unreadable).
    Please do not ask for code as refusal often offends.

    ** This space for rent **

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