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Author: Katnap Kaos

Making a ship with Thrust and Friction

On the Stage, make a movieClip and name it 'ship' or 'player' or whatever will identify the MC as YOU! Go Back to the Main Stage and name the MC's Instance the same as you named the MC (Once again, you don't have to name it the same, just as long as you can identify it). Make it look like a small space ship. Now Put this script into it's action box:

onClipEvent (load) {
	thrust = 1;
	decay = .99;
	maxSpeed = 15;
}
onClipEvent (enterFrame) {
	if (Key.isDown(Key.RIGHT)) {
		_rotation += 10;
	}
	if (Key.isDown(Key.LEFT)) {
		_rotation -= 10;
	}
	if (Key.isDown(Key.UP)) {
		xSpeed += thrust*Math.sin(_rotation*(Math.PI/180));
		ySpeed += thrust*Math.cos(_rotation*(Math.PI/180));
		flames._visible = 1;
	} else {
		xSpeed *= decay;
		ySpeed *= decay;
		flames._visible = 0;
	}
	speed = Math.sqrt((xSpeed*xSpeed)+(ySpeed*ySpeed));
	if (speed>maxSpeed) {
		xSpeed *= maxSpeed/speed;
		ySpeed *= maxSpeed/speed;
	}
	_y -=ySpeed;
	_x +=xSpeed;

	if (_y<0) {
		_y = 400;
	}
	if (_y>400) {
		_y = 0;
	}
	if (_x<0) {
		_x = 550;
	}
	if (_x>550) {
		_x = 0;
	}
}
_________________________ Now, enter the 'ship' MC and create a new MC, and call it 'flames'. Make the flames look like they are coming out of the engine (or something). Test your movie and enjoy!
» Level Intermediate

Added: 2003-11-26
Rating: 6 Votes: 72
(10 being the highest)
» Author
I mainly use Flash 5.
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Download the files used in this tutorial.
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