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Author: Matthew Strange | Website:

Driving Car Boundarys

This is a tutorial explaining how you would make a car based game using boundarys.

I will explain how this is done, step by step:

1.Create an outline of where you would like your boundarys to be, I used a square, Make this a MC and give it a instance name land.

2.Design a car, and turn that into a MC, No need to give it an instance name because all the actions will be in it.

3.Click on your car and bring up the actions panel, here are the actions to add:

onClipEvent (enterFrame) {
    // make the car go forward
    if (Key.isDown(Key.UP)) {
        speed += 1;
    // make the car go backwards
    if (Key.isDown(Key.DOWN)) {
        speed -= 1;
    // tells the car to slow down after the speed of 20
    if (Math.abs(speed)>20) {
        speed *= .7;
    // you can change the rotation of the car to your desire
    if (Key.isDown(Key.LEFT)) {
        _rotation -= 15;
    if (Key.isDown(Key.RIGHT)) {
        _rotation += 15;
    // here is where the hittest is for the boundary
    speed *= .98;
    x = Math.sin(_rotation*(Math.PI/180))*speed;
    y = Math.cos(_rotation*(Math.PI/180))*speed*-1;
    if (!, _y+y, true)) {
        _x += x;
        _y += y;
    } else {
        speed *= -.6;

4.Finished, now test it out.

» Level Intermediate

Added: 2002-08-20
Rating: 4.96 Votes: 275
(10 being the highest)
» Author
Game Designer
» Download
Download the files used in this tutorial.
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