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  1.  
  2. public class Line
  3. {
  4.    private static double EPSILON=1E-14;
  5.    private double cx1;
  6.    private double cy1;
  7.    private double cx2;
  8.    private double cy2;
  9.    private double m;
  10.    private double cb;
  11.    private double ca;
  12.    
  13.    //When (x,y) and m are given
  14.    public Line(double x1, double y1, double slope)
  15.    {
  16.       //Sets the variables
  17.       cx1=x1;
  18.       cy1=y1;
  19.       m=slope;
  20.      
  21.       //Finds b for y=mx+b
  22.       cb=(cx1*m)-y1;    
  23.    }
  24.    
  25.    //When (x1, y1) and (x2, y2) are given
  26.    public Line(double x1, double y1, double x2, double y2)
  27.    {
  28.       //Sets the variables
  29.       cx1=x1;
  30.       cy1=y1;
  31.       cx2=x2;
  32.       cy2=y2;
  33.      
  34.       //Finds the slope
  35.       m=(cy2-cy1)/(cx2-cx1);
  36.      
  37.       //Finds b for y=mx+b
  38.       cb=(cx1*m)-y1;
  39.    }
  40.    
  41.    //When y=mx+b is given
  42.    public Line(double slope, double b)
  43.    {
  44.       //Sets the variables
  45.       m=slope;
  46.       cb=b;
  47.      
  48.    }
  49.    
  50.    //When x=a is given for vertical lines
  51.    public Line(double a)
  52.    {
  53.       //Sets the variables
  54.       ca=a;
  55.      
  56.       //Slope and y intercept are zero, since it's vertical
  57.       m=0;
  58.       cb=0;
  59.      
  60.    }
  61.    
  62.  
  63.    public boolean intersects(Line other)
  64.    {
  65.       if(Math.abs(m-other.m) > EPSILON)
  66.          return true;
  67.       else
  68.          return false;
  69.    }
  70.    
  71.    public boolean equals(Line other)
  72.    {
  73.       if((Math.abs(m-other.m) < EPSILON) && (Math.abs(cb-other.cb) < EPSILON))
  74.          return true;
  75.       else
  76.          return false;
  77.    }
  78.    
  79.    public boolean isParallel(Line other)
  80.    {
  81.       if(Math.abs(m-other.m) < EPSILON)
  82.          return true;
  83.       else
  84.          return false;
  85.    }
  86. }
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