simple mouse controlled RGB mixer in Processing

rgb_mixer.pde

int[] c = {30,120,180}; //default color

void setup() {
  
  String[] args = {"ResultApplet"};
  ResultApplet ra = new ResultApplet();
  PApplet.runSketch(args, ra);

  size(300, 256);
  surface.setTitle("MixerApplet");
}

void draw() {
  for (int i=0;i<3;i++) {
    stroke(i==0?255:0,i==1?255:0,i==2?255:0);
    fill(255,255,255);
    rect(i*100,0,99,256);
    fill(i==0?255:0,i==1?255:0,i==2?255:0);
    rect(i*100,255-c[i],99,c[i]);
  }
}

void mouseWheel(MouseEvent event) {
  int i = mouseX/100;
  c[i]=c[i]-8*event.getCount();
  if (c[i]>255) {c[i]=255;}
  if (c[i]<0) {c[i]=0;}
}

void mouseClicked() {
  int i = mouseX/100;
  c[i]=255-mouseY;
}

public class ResultApplet extends PApplet {

  public void draw() {
    surface.setSize(300,256);
    background(c[0],c[1],c[2]);
    fill(c[0]+c[1]+c[2]>=384?0:255);
    textAlign(CENTER,CENTER);
    textSize(40);
    text(c[0]+","+c[1]+","+c[2],150,128);
  }
}