07 教孩子学编程 画运动的圆

int x=100;

int direction=1;

void setup(){

  size(640,640);

  background(255);

}

void draw(){

  background(255);

  fill(255,0,255);

  ellipse(x,200,50,50);

  x=x+1*direction;

  if(x>=575||x<=25)

direction=-direction;

}