IntervalThe interval in milliseconds at which the sprite's position is updated. For example, if the interval is 50 and the speed is 10, then the sprite will move 10 pixels every 50 milliseconds.
Speed
The speed at which the sprite moves. The sprite moves this many pixels every interval.
HeadingReturns the sprite's heading in degrees above the positive x-axis. Zero degrees is toward the right of the screen; 90 degrees is toward the top of the screen
you might want to do some tutorials to learn the basics
Taifun