let graphics;

​

function setup() {

  createCanvas(400, 400);

  pixelDensity(1);

  graphics=createGraphics(400,300);

  graphics.background(0);

}

​

function draw() {

  if(mouseIsPressed){

  graphics.fill(255);

  graphics.stroke(255);

  graphics.ellipse(mouseX,mouseY,60)

}

  image(graphics,0,0);

​

fill(255,0,255);

ellipse(mouseX,mouseY,30);

}