gyuha-wa-vect0r_Processing_old/2018/1학기/P18/P18.pde
float r = 100;
float g = 150;
float b = 200;
float a = 200;

float diam = 20; 
float x = 100;
float y = 100;

void setup(){
  size(200,200);
  background(255);
}

void draw(){
  noStroke();
  fill(r,g,b,a);
  ellipse(x,y,diam,diam);
}