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;
  }
}

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