/**
 a simple isometric graphic by <a href="http://www.local-guru.net/">guru</a>
 */
 
void setup() {
  size(300,300);
  smooth();
  textFont(loadFont("FreeMono-24.vlw"));
}

void draw() {
  pushMatrix();
  translate( width/2, height/2 );
  scale( 1, 0.5 );
  rotate( radians( 45 ) );
  translate( -width/2, -height/2 );
  background(255);
  
  noFill();
  stroke(0);
  strokeWeight(2);
  
  isoLine( new PVector( 100,100,0 ), new PVector(100,200,0));
  isoLine( new PVector( 100,200,0 ), new PVector(200,200,0));
  isoLine( new PVector( 200,200,0 ), new PVector(200,100,0));
  isoLine( new PVector( 200,100,0 ), new PVector(100,100,0));

  fill(0);
  textSize(24);
  isoText( "ISO TEST", new PVector(80, 70, 50 ));
  
  isoLine( new PVector( 100,100,50 ), new PVector(100,200,50));
  isoLine( new PVector( 100,200,50 ), new PVector(200,200,50));
  isoLine( new PVector( 200,200,50 ), new PVector(200,100,50));
  isoLine( new PVector( 200,100,50 ), new PVector(100,100,50));

  isoLine( new PVector( 80,80,50 ),   new PVector(80,220,50));
  isoLine( new PVector( 80,220,50 ),  new PVector(220,220,50));
  isoLine( new PVector( 220,220,50 ), new PVector(220,80,50));
  isoLine( new PVector( 220,80,50 ),  new PVector(80,80,50));

  stroke(128);
  strokeWeight(0.5);
  
  isoLine( new PVector( 100,100,0), new PVector( 100,100,50 ));
  isoLine( new PVector( 100,200,0), new PVector( 100,200,50 ));
  isoLine( new PVector( 200,200,0), new PVector( 200,200,50 ));
  isoLine( new PVector( 200,100,0), new PVector( 200,100,50 ));
 
  popMatrix();
}

void isoLine( PVector p1, PVector p2 ) {
  line( p1.x - p1.z, p1.y - p1.z, p2.x - p2.z, p2.y - p2.z );
}

void isoText( String s, PVector pos ) {
  text( s, pos.x - pos.z, pos.y - pos.z );
}