Raidovan

x = 4;
y = 4;
accx = 1;
accy = 1;
w = 7;
h = 7;
void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:
  if (x<=0 or x>=w){
    accx=-accx;
  }
   if (y<=0 or y>=h){
    accy=-accy;
  }
  x += accx;
  y +=accy;



}