Drivable Car

Description: This car moves forwards, backwards, turns, and has angling wheels.
Author: John Bezanis
Added: January 28th 2007
Version: Flash 8

The car is drivable on the press of the direction keys. The car moves forward, backwards, turns, and has moving front wheels.

//www.swfspot.com
 
//movement speed of the car
var speed=7;
//Compute pi/180. The value is used twice for each frame, so storing it as a variable saves CPU
var piOver180=Math.PI/180;
onEnterFrame=function(){
  //If the left or right keys are down, rotate the wheels
  if(Key.isDown(Key.LEFT)){
    car.leftwheel._rotation=Math.min(24,Math.max(-24,car.leftwheel._rotation-5));
    car.rightwheel._rotation=Math.min(24,Math.max(-24,car.rightwheel._rotation-5));
  }
  if(Key.isDown(Key.RIGHT)){
    car.leftwheel._rotation=Math.min(24,Math.max(-24,car.leftwheel._rotation+4));
    car.rightwheel._rotation=Math.min(24,Math.max(-24,car.rightwheel._rotation+4));
  }
  //check if the up or down keys are pressed
  if(Key.isDown(Key.UP)||Key.isDown(Key.DOWN)){
    //if the up key is down, the car moves forward
    if(Key.isDown(Key.UP)){
      carDirection=1;
    //otherwise move the car backwards
    }else{carDirection=-1;}
    //default turning to false
    turning=0;
    //if the left or right keys are pressed, set turning to true and rotate the car
    if(Key.isDown(Key.LEFT)){
      turning=1;
      car._rotation-=5*carDirection;
    }
    else if(Key.isDown(Key.RIGHT)){
      turning=1;
      car._rotation+=5*carDirection;
    }
    //if the car isn't turning, reset the rotation of the tires
    if(!turning){
      car.leftwheel._rotation=0;
      car.rightwheel._rotation=0;
    }
    //move the car. The y coordinate plane is flipped in flash, so we use - instead of +
    car._x+=Math.sin(car._rotation*piOver180)*speed*carDirection;
    car._y-=Math.cos(car._rotation*piOver180)*(speed)*carDirection;
  }
}

Download Source File

Comments

Good tut, but you could add physics, like friction, drag, etc. This would cause the car to behave more realistically. It would coast, slide, and other good stuff.

June 2nd 2007 11:06AM - Egan

can utell how thr car was made

October 11th 2007 10:10PM - altaf

Even a little simple physics would be awsome

October 30th 2008 12:10AM - Axl

I am happy to find many useful information in the post, thanks.

December 6th 2009 02:12AM - seo

Really nice post,thanks for sharing.

December 7th 2009 10:12AM - condo

I have bookmarked your site. Thanks for sharing

December 13th 2009 08:12AM - dental

If could add physics, like friction, drag, etc. This would cause the car to behave more realistically. It would coast, slide, and other good stuff.

December 17th 2009 02:12AM - Dating Advice

i like

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Thank you for sharing the source file. Much appreciated. Cheers.

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