Creating and Using a tree(x, y) Function

mySketch

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var x = 50;
var y = 50;
var vx = 5 ;
var vy = 5
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  background(100);
}
​
function draw() { 
  if(x>width || x<0 ){
    vx=-vx
  }
  if(y>height || y<0 ){
    vy=-vy
  }
  x=x+vx;
  y=y+vy
  
ellipse(x, y, 55, 100);
describe('A white ellipse with black outline in middle of a gray canvas.');
  color (50,100,0)
}