package com.aaaaahhhhhhh.bananapuncher714.mesh;

public class Test {
    public static void main( String[] args ) {
        final Vector2d a = new Vector2d( -1, -1 );
        final Vector2d b = new Vector2d( 10, 10 );
        final Vector2d c = new Vector2d( 0, -1 );
        final Vector2d d = new Vector2d( 10, 11 );
        
        test( a, b, c, d );
    }

    public static void test( final Vector2d a, final Vector2d b, final Vector2d c, final Vector2d d ) {
        final Vector2d ab = b.subtracted( a );
        final Vector2d cd = d.subtracted( c );
        
        final Vector2d ac = c.subtracted( a );
        
        final double acab = ac.cross( ab );
        final double abcd = ab.cross( cd );
        
        System.out.println( "Parallel value: " + abcd );
        if ( abcd != 0 ) {
            final double s = ac.cross( cd );
            final double t = s / abcd;
            final double u = acab / abcd;
            
            System.out.println( "S: " + s );
            System.out.println( "T: " + t );
            System.out.println( "U: " + u );

            System.out.println( "AB Length: " + ( t * ab.length() ) );
            System.out.println( "CD Length: " + ( u * cd.length() ) );
            
            // Gives the intersection correctly
            System.out.println( "AB int: " + ab.multiplied( t ).add( a ) );
            System.out.println( "CD int: " + cd.multiplied( u ).add( c ) );
        } else {
            
        }
    }
}