Random Numbers


Text of video

Download penguin-jumping.a3p

Experiment! Try different ranges of values. Try making amountToFlap a random amount between a little less than amountToJump and a little more. Try to make a natural looking jump.

public void myFirstMethod() {
  Double amountToJump = 0.5;
  Double amountToFlap = 0.25;
  while ( true ) {
    amountToJump = RandomUtilities.nextDoubleInRange( 0.1, 0.7 );
    amountToFlap = amountToJump/2.0;
    doTogether( ()-> {
      this.penguin.getLeftWingShoulder().turn( TurnDirection.BACKWARD, amountToFlap );
        }, ()-> {
      this.penguin.getRightWingShoulder().turn( TurnDirection.BACKWARD, amountToFlap );
        }, ()-> {
      this.penguin.move( MoveDirection.UP, amountToJump );
        } );
    doTogether( ()-> {
      this.penguin.getLeftWingShoulder().turn( TurnDirection.FORWARD, amountToFlap );
        }, ()-> {
      this.penguin.getRightWingShoulder().turn( TurnDirection.FORWARD, amountToFlap );
        }, ()-> {
      this.penguin.move( MoveDirection.DOWN, amountToJump );
        } );
    }
} 

NEXT: A Fish swims back and forth