void setup(){
  size(500,500);
  background(255);
  smooth();
  noLoop();
}

void draw(){
  drawPieBySeason(3, 5, 4, 6, width/2, height/2, 200);
}

void drawPieBySeason(int spring, int summer, int fall, int winter, int centerX, int centerY, int sz){
  int total = spring+summer+fall+winter;
  float percSpring = (float)spring/total;
  float percSummer = (float)summer/total;
  float percFall = (float)fall/total;
  float percWinter = (float)winter/total;
  
  color springC = color(238, 118,0);
  color summerC = color(123, 165, 248);
  color fallC = color(7,237,20);
  color winterC = color(255, 246, 63);
  
  float startAngle;
  float endAngle;
  
  startAngle = 0;
  endAngle = TWO_PI*percSpring;
  fill(springC);
  noStroke();
  arc(centerX, centerY, sz, sz, startAngle, endAngle);
  
  startAngle = endAngle;
  endAngle = startAngle + TWO_PI*percSummer;
  fill(summerC);
  noStroke();
  arc(centerX, centerY, sz, sz, startAngle, endAngle);
  
  startAngle = endAngle;
  endAngle = startAngle + TWO_PI*percFall;
  fill(fallC);
  noStroke();
  arc(centerX, centerY, sz, sz, startAngle, endAngle);
  
  startAngle = endAngle;
  endAngle = startAngle + TWO_PI*percWinter;
  fill(winterC);
  noStroke();
  arc(centerX, centerY, sz, sz, startAngle, endAngle); 
  
}