/* Auteur: Nicolas JANEY                                */
/* nicolas.janey@univ-fcomte.fr                         */
/* Octobre 2007                                         */

public class Facette4 {
  public Position p1;
  public Position p2;
  public Position p3;
  public Position p4;

  public Facette4() {
    p1 = new Position();
    p2 = new Position();
    p3 = new Position();
    p4 = new Position();
  }

  public Facette4(Position p1,Position p2,Position p3,Position p4) {
    this.p1 = new Position(p1);
    this.p2 = new Position(p2);
    this.p3 = new Position(p3);
    this.p4 = new Position(p4);
  }

  public Facette4(Facette4 f) {
    p1 = new Position(f.p1);
    p2 = new Position(f.p2);
    p3 = new Position(f.p3);
    p4 = new Position(f.p4);
  }

  public boolean testPlanarite() {
    Direction d12 = new Direction(p1,p2,false);
    Direction d13 = new Direction(p1,p3,false);
    Direction normale = d12.produitVectoriel(d13);
    Direction d14 = new Direction(p1,p4,false);
    return(d14.produitScalaire(normale) == 0.0F);
  }

  public boolean testConvexite() {
    Direction d12 = new Direction(p1,p2,false);
    Direction d14 = new Direction(p1,p4,false);
    Direction n1 = d12.produitVectoriel(d14);
    Direction d23 = new Direction(p2,p3,false);
    Direction d21 = new Direction(p2,p1,false);
    Direction n2 = d23.produitVectoriel(d21);
    if ( !n1.testCodirection(n2) )
      return(false);
    Direction d34 = new Direction(p3,p4,false);
    Direction d32 = new Direction(p3,p2,false);
    Direction n3 = d34.produitVectoriel(d32);
    if ( !n1.testCodirection(n3) )
      return(false);
    Direction d41 = new Direction(p4,p1,false);
    Direction d43 = new Direction(p4,p3,false);
    Direction n4 = d41.produitVectoriel(d43);
    if ( !n1.testCodirection(n4) )
      return(false);
    return(true);
  }
  
  public String toString() {
    return("["+p1+",\n "+p2+",\n "+p3+",\n "+p4+"]");
  }
}