bianliang

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(100);

}

  let r=0

  let x=50

  let y=50

  let vx=3

  let vy=3

function draw() {

  // let d=0

  // d=mouseX

  // rectMode(CENTER)

  // let brightnessR=(d/2+40)*2

  // let brightnessG=d/3*2+30

  // let brightnessB=d/4+20*2-30

  // // fill(brightnessR,brightnessG,brightnessB)

  // // circle(mouseX, mouseY, 20);

  // rect(width/2,height/3,d,d)

  // ellipse(width/2,height/2,d,d)

  // ellipse(width/2,height/3*2,d,d)

  // let darkR=brightnessR/2

  // let darkG=brightnessG/2

  // let darkB=brightnessB/2

  // fill(darkR,darkG,darkB)

  ellipse(x,y,50)

  x+=vx

  y+=vy

  vy+=0.2

  if(y>height){

    vy=-vy*0.5

    y=height}

}