Midterm - OpenProcessing

mySketch
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let clr = [];
let i = 0;
let f = 0;
brush = 1;
let drawing;
​
function setup() {
  drawing = createCanvas(400, 400);
  background(220);
  clr = [255, color(255, 0, 0), color(0, 255, 0), color(0, 0, 255), 0];
  f = clr[i];
}
​
function draw() {
  
  fill(f);
  if(mouseIsPressed){
    if(brush == 1){
    stroke(f);
    circle(mouseX,mouseY, 30);
    }
    if(brush == 2){
    stroke(f)
     rect(mouseX,mouseY, 30); 
    }
    if(brush == 3){
      stroke(f);
      line(mouseX, mouseY, pmouseX, pmouseY);
    }
  }
}
function keyPressed(){
  if(keyCode == SHIFT){
  background(random(0,255),random(0,255), random(0,255));
  } 
  if(keyCode == RETURN){
    background(220);
  }
  if(key == 'c'){
    i++;
  }
  if(key == 'b'){
    brush++;
  }
  if(brush>3){
    brush = 1;
  }
  if(i > 4){
    i = 0;
  }
  f = clr[i];
  
  if(key == 'p'){
    saveCanvas(drawing, 'myDrawing', 'jpg');
  }
  }