// default behavior is to read LDraw lines as comments
class LDrawPrimitive{

  Integer col;

  LDrawPrimitive(){
    super();

  };
  
  Integer getType(){
    return 0;
  };
  
  void readln(String input){
   
  };
  
  void writeln(){
   
  };
  
  void draw(int basecol){
  }; 

  // nothing to draw()
};

class LDrawLine extends LDrawPrimitive{
  Vector3D p1;
  Vector3D p2;
  int col;

  LDrawLine(){
    p1 = new Vector3D();
    p2 = new Vector3D();
    col = 0;
  };
  
  void readln(String input){
    String[] t = splitTokens( input.trim(), " ");
    col = new Integer( t[ 1]);
    p1 = new Vector3D( new Float( t[ 2]), new Float( t[ 3]), new Float( t[ 4]));
    p2 = new Vector3D( new Float( t[ 5]), new Float( t[ 6]), new Float( t[ 7]));
  };
  
  void draw( int basecol){
//    if( col != 16 && col != 24){
      colorlib.findByCode( col).setColorEdge();
//    };
    line( p1.x, p1.y, p1.z, p2.x, p2.y, p2.z);
  };
};

class LDrawTri extends LDrawPrimitive{
  Vector3D p1, p2, p3;
  
  void readln( String input){
    String[] t = splitTokens( input.trim(), " ");
    col = new Integer( t[ 1]);
    p1 = new Vector3D( new Float( t[ 2]), new Float( t[ 3]), new Float( t[ 4]));
    p2 = new Vector3D( new Float( t[ 5]), new Float( t[ 6]), new Float( t[ 7]));
    p3 = new Vector3D( new Float( t[ 8]), new Float( t[ 9]), new Float( t[ 10]));
    
  };
  
  void draw( int basecol){
    if( col == 16){
      colorlib.findByCode( basecol).setColorFill();
    }else if( col != 24){
      colorlib.findByCode( col).setColorFill();
    };
    noStroke();
    beginShape(TRIANGLES);
    vertex( p1.x, p1.y, p1.z);
    vertex( p2.x, p2.y, p2.z);
    vertex( p3.x, p3.y, p3.z);
    endShape(); 
  };
};

class LDrawQuad extends LDrawPrimitive{
  Vector3D p1, p2, p3, p4;
  
  void readln( String input){
    String[] t = splitTokens( input.trim(), " ");
    col = new Integer( t[ 1]);
    p1 = new Vector3D( new Float( t[ 2]), new Float( t[ 3]), new Float( t[ 4]));
    p2 = new Vector3D( new Float( t[ 5]), new Float( t[ 6]), new Float( t[ 7]));
    p3 = new Vector3D( new Float( t[ 8]), new Float( t[ 9]), new Float( t[ 10]));
    p4 = new Vector3D( new Float( t[ 11]), new Float( t[ 12]), new Float( t[ 13]));
  };
  
  void draw( int basecol){
//    println( "Drew a Quad");
    if( col == 16){
      colorlib.findByCode( basecol).setColorFill();
    }else if( col != 24){
      colorlib.findByCode( col).setColorFill();
    };
    noStroke();
    beginShape(QUADS);  
    vertex( p1.x, p1.y, p1.z);
    vertex( p2.x, p2.y, p2.z);
    vertex( p3.x, p3.y, p3.z);
    vertex( p4.x, p4.y, p4.z);
    endShape(); 
  };
  
  
};

class LDrawOptLine extends LDrawPrimitive{
  Vector3D p1;
  Vector3D p2;
  Vector3D p3;
  Vector3D p4;
  
  Vector3D s1;
  Vector3D s2;
  Vector3D s3;
  Vector3D s4;


  LDrawOptLine(){
    p1 = new Vector3D();
    p2 = new Vector3D();
    p3 = new Vector3D();
    p4 = new Vector3D();
    col = 0;

    s1 = new Vector3D();
    s2 = new Vector3D();
    s3 = new Vector3D();
    s4 = new Vector3D();
  };
  
  void readln( String input){
    String[] t = splitTokens( input.trim(), " ");
    col = new Integer( t[ 1]);
    p1 = new Vector3D( new Float( t[ 2]), new Float( t[ 3]), new Float( t[ 4]));
    p2 = new Vector3D( new Float( t[ 5]), new Float( t[ 6]), new Float( t[ 7]));
    p3 = new Vector3D( new Float( t[ 8]), new Float( t[ 9]), new Float( t[ 10]));
    p4 = new Vector3D( new Float( t[ 11]), new Float( t[ 12]), new Float( t[ 13]));
  };
  
  void draw( int basecol){
    
    if( basecol != -1) return;
    /*
      E1x = P1x-P2x 
      E1y = P1y-P2y 
      E2x = P3x-P2x 
      E2y = P3y-P2y
      if ((E1x * E2y - E1y * E2x) >= 0) clockwise = TRUE; 
      else clockwise = FALSE;
    */
    s1.setXYZ( screenX( p1.x, p1.y, p1.z), screenY( p1.x, p1.y, p1.z), 0.0);
    s2.setXYZ( screenX( p2.x, p2.y, p2.z), screenY( p2.y, p2.y, p2.z), 0.0);
    s3.setXYZ( screenX( p3.x, p3.y, p3.z), screenY( p3.y, p3.y, p3.z), 0.0);
    s4.setXYZ( screenX( p4.x, p4.y, p4.z), screenY( p4.y, p4.y, p4.z), 0.0);
/*
    s1.setXYZ( screenX( p1.x, p1.y, p1.z), screenY( p1.x, p1.y, p1.z), screenZ( p1.x, p1.y, p1.z));
    s2.setXYZ( screenX( p2.x, p2.y, p2.z), screenY( p2.y, p2.y, p2.z), screenZ( p2.y, p2.y, p2.z));
    s3.setXYZ( screenX( p3.x, p3.y, p3.z), screenY( p3.y, p3.y, p3.z), screenZ( p3.y, p3.y, p3.z));
    s4.setXYZ( screenX( p4.x, p4.y, p4.z), screenY( p4.y, p4.y, p4.z), screenZ( p4.y, p4.y, p4.z));
*/
/*
    float E1x = s2.x - s1.x;
    float E1y = s2.y - s1.y;
    float E2x = s3.x - s1.x;
    float E2y = s3.y - s1.y;
    float r1 = E1x * E2y - E1y * E2x;
    E1x = s1.x - s2.x;
    E1y = s1.y - s2.y;
    E2x = s4.x - s2.x;
    E2y = s4.y - s2.y;
    float r2 = E1x * E2y - E1y * E2x;
*/    
    /*
                (xi - xi-1) * (yi+1 - yi) - (yi - yi-1) * (xi+1 - xi) 
    */
    float r1 =  (s1.x - s2.x) * (s3.y - s1.y) - (s1.y - s2.y) * (s3.x - s1.x);
    float r2 =  (s1.x - s2.x) * (s4.y - s1.y) - (s1.y - s2.y) * (s4.x - s1.x);
    if( r1 <= 0 == r2 <= 0){ // ^ == XOR
//      colorlib.findByCode( col).setColorEdge();
      stroke( color( 255, 0, 255));
      
      line( p1.x, p1.y, p1.z, p2.x, p2.y, p2.z);
    };
  };
};