week1小精靈

void setup(){  size(400,400);}int X=100, Y=100, dx=1, dy=0,angle=45,diff=2,dir=0;void draw(){  background(0);  arc(X,Y,80,80, radians(dir+angle),radians(dir+360-angle),PIE);  angle+=diff;  if(angle>60)diff=-2;  if(angle<0)diff=+2;  X+=dx; Y+=dy;}void keyPressed(){  if(keyCode==RIGHT){dx=+1;dy=0;dir=0;}  if(keyCode==LEFT){dx=-1;dy=0;dir=180;}  if(keyCode==UP){dx=0;dy=-1;dir=270;}  if(keyCode==DOWN){dx=0;dy=+1;dir=90;}}