fullscreen void setup()
{size(600, 400);
smooth();
rectMode(CENTER);
background(0);}
void draw()
{if(mousePressed)
{stroke(#19FC0A,15);
noFill();
ellipse(width/2, height/2, mouseX, mouseY);}
else
{stroke(#FFFFFF,15);
noFill();
ellipse(width/2, height/2,mouseX,mouseY);}}