float a = 0;
float b = 0;
float c = 0;
float d = 0;

void setup() {
  size (900,300);  

}

void draw(){

  background (40, 160, 180);
  
  smooth();
  fill(300,200,100,100);
  stroke(0,0,0,100);
  triangle(a+900, 150, a+1000, 75, a+940, 160);
  triangle(a+900, 150, a+960, 60, a+940, 160);
  triangle(a+890, 148, a+940, 155, a+940, 160);
  
  
  fill (200,250,0,20); 
  stroke (0,0,0,100); 
  triangle(a + 950,220, a + 1050,140, a + 990,225); 
  triangle(a + 950,220, a + 1020,140, a + 990,225); 
  triangle(a + 940,220, a + 990,220, a + 990,225); 
  
  fill (230,205,0,50); 
  stroke (0,0,0,100); 
  triangle(d + 1150,200, d + 1200,180, d + 1180,205); 
  triangle(d + 1150,200, d + 1190,180, d + 1180,205); 
  triangle(d + 1140,200, d +1180,200,  d + 1180,205); 
  

  a = a - .5;
  d = d - .4;
  
  smooth();
  noStroke();
  
  
  //white ellipses as clouds
   
  fill(255,50);
  
  ellipse(b+180,80,30,30);
  ellipse(b+120,90,80,80);
  ellipse(b+150,120,100,100);
  ellipse(b+170,70,120,120);
  
  
  fill(255,150);
  
  
  ellipse(c+120,70,40,40);
  ellipse(c+130,80,20,20);
  ellipse(c+160,60,50,50);
  ellipse(c+180,50,30,30);
  ellipse(c+200,70,60,60);
  
  fill(255,120);
  
  ellipse(b+300,30,60,60);
  ellipse(b+330,20,80,80);
  ellipse(b+380,40,70,70);
  ellipse(b+420,30,20,20);

  fill(255,150);
  
  ellipse(c+675,30,20,20);
  ellipse(c+685,40,30,30);
  ellipse(c+710,20,60,60);
  ellipse(c+740,30,50,50);
  ellipse(c+760,40,20,20);
  
  fill(255,50);
  
  ellipse(c+280,220,130,130);
  ellipse(c+320,280,140,140);
  ellipse(c+350,220,100,100);
  ellipse(c+390,240,30,30);
  
  
  
  fill(255,150);
  
  ellipse(b+920,20,20,20);
  ellipse(b+940,20,40,40);
  ellipse(b+960,40,60,60);
  ellipse(b+980,30,50,50);
  ellipse(b+1000,40,40,40);
  
   fill(255,50);
  
  ellipse(c+780,120,50,50);
  ellipse(c+720,140,100,100);
  ellipse(c+750,170,100,100);
  

   fill(255,120);

  ellipse(c+1050,30,40,40);
  ellipse(c+1060,20,20,20);
  ellipse(c+1080,40,30,30);
  ellipse(c+1110,20,60,60);
  ellipse(c+1140,10,70,70);
  ellipse(c+1160,40,20,20);

  ellipse(b+1220,50,40,40);
  ellipse(b+1230,70,20,20);
  ellipse(b+1260,60,50,50);
  ellipse(b+1280,50,30,30);
  ellipse(b+1300,60,60,60);
  ellipse(b+1330,50,80,80);
  ellipse(b+1380,70,70,70);
  ellipse(b+1420,60,20,20);

  fill(255,100);
  
  ellipse(c+1480,20,20,20);
  ellipse(c+1520,30,80,80);
  ellipse(c+1550,40,40,40);
  ellipse(c+1675,30,20,20);
  ellipse(c+1685,40,30,30);
  ellipse(c+1710,20,60,60);
  ellipse(c+1740,30,50,50);
  ellipse(c+1760,40,20,20);
 

  b = b - .2;
  
  c = c - .1;
  
}