/**
//// DAY AND NIGHT CYCLE STUDY PROP \\\\
Jenna Klima
Mr. Martin
10/28/14
**/

float sunX = 150;
float sunY = 150;
float setDaycycle = 2;

void setup ( ) {
  size ( 600, 600 );
  background ( 200 );
}
void draw ( ) {
  sky ( );
  ground ( );
  sunMoon ( );
}
void ground ( ) {
  if ( setDaycycle %2 == 0 ) {
  fill ( 150, 250, 150 );
  }
  else{
  fill ( 50, 100, 50 );
  }
  noStroke ( );
  rect ( 0, height-201, width, 200 );
  stroke ( 0 );
}
void sky ( ) {
  if ( setDaycycle %2 == 0 ) {
  noStroke ( );
  fill ( 150, 150, 250 );
  }
  else{
  noStroke ( );
  fill ( 75 );
  }
  rect ( 0, 0, width, height / 1.5 );
  stroke ( 0 );
}
void sunMoon ( ) {
  float arc = -70 * sin ( PI * sunX / width );
  if ( setDaycycle %2 == 0 ) {
    ellipseMode ( CORNER );
    noStroke ( );
    fill ( 255, 255, 100 );
    ellipse ( sunX - 24, sunY - 24 + arc, 50, 50 );
    sunX = sunX + 1;

  //sun rays
  strokeWeight ( 3 );
  stroke ( 255, 255, 100 );
  line ( sunX + 40, sunY + 40 + arc, sunX + 18, sunY + 18 + arc );
  line ( sunX - 40, sunY - 40 + arc, sunX - 18, sunY - 18 + arc );
  
  line ( sunX + 40, sunY - 40 + arc, sunX + 18, sunY - 18 + arc );
  line ( sunX - 40, sunY + 40 + arc, sunX - 18, sunY + 18 + arc );
  
  line ( sunX, sunY + 25 + arc, sunX, sunY + 55 + arc );
  line ( sunX, sunY - 25 + arc, sunX, sunY - 55 + arc );
  
  line ( sunX + 25, sunY + arc, sunX + 55, sunY + arc );
  line ( sunX - 25, sunY + arc, sunX - 55, sunY + arc );
  }
  else { fill ( 220 );
  }
  ellipseMode ( CORNER );
  noStroke ( );
  ellipse ( sunX - 24, sunY - 24 + arc, 50, 50 );
  sunX = sunX + 2;

  //reset sun AND moon (works with both)
  if ( sunX > width + 10 ) {
  sunX = 0;
  //--  sunY = random ( 50, 130 );
  setDaycycle = setDaycycle +1 ;
  }
}