Canvas.as

package com.drift
{
    import flash.text.TextFieldType;
    import flash.display.Stage;
    import flash.text.TextField;

    import flash.accessibility.Accessibility;
    import flash.events.KeyboardEvent;
    import flash.display.Shape;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    import flash.display.Sprite;

    public class Canvas extends Sprite
    {
        private var car:Car = new Car();

        private var left:Boolean = false;
        private var right:Boolean = false;
        private var up:Boolean = false;
        private var down:Boolean = false;
        private var test:int = 0;



        private var powerBox:TextField = new TextField();
        private var dragBox:TextField = new TextField();
        private var turnspeedBox:TextField = new TextField();
        private var angulardragBox:TextField = new TextField();

        private var powerLabel:TextField = new TextField();
        private var dragLabel:TextField = new TextField();
        private var turnspeedLabel:TextField = new TextField();
        private var angulardragLabel:TextField = new TextField();

        public function Canvas(stag:Stage)
        {
            //create inputfields
            createTextBoxes();


            //creating car
            addChild(car);
            car.x = 200;
            car.y = 200;

            //add eventlisteners
            this.addEventListener(Event.ENTER_FRAME,lp);
            stag.addEventListener(KeyboardEvent.KEY_DOWN, kdo);
            stag.addEventListener(KeyboardEvent.KEY_UP, kup);
        }

        private function lp(e:Event):void
        {

            //updating car values
            car.power = Number(powerBox.text);
            car.drag = Number(dragBox.text);
            car.turnSpeed = Number(turnspeedBox.text);
            car.angularDrag = Number(angulardragBox.text);


                //add velocity to car
                car.x += car.velocityX;
                car.y += car.velocityY;

                //multiply velocity with drag
                car.velocityX *= car.drag;
                car.velocityY *= car.drag;

                //add turningvelocity to car's rotation
                car.angle += car.angularVelocity;

                //multiply turningvelocity with turningdrag
                car.angularVelocity *= car.angularDrag;

                //to accelerate
                if(up){
                car.velocityX += Math.sin(car.angle) * car.power;
                car.velocityY -= Math.cos(car.angle) * car.power;
                }

                //to steer left
                if(left){
                car.angularVelocity -= car.turnSpeed;
                }

                //to steer right
                if(right){
                car.angularVelocity += car.turnSpeed
                }


                //add rotation to the car from radian to degree
                car.rotation = car.angle*(180/Math.PI);




        }
        private function kdo(e:KeyboardEvent):void
        {
            switch(e.keyCode){
                case 37:
                left = true;
                break;
                case 38:
                up = true;
                break;
                case 39:
                right = true;
                break;
                case 40:
                down = true;
                break;
            }
        }
        private function kup(e:KeyboardEvent):void
        {
            switch(e.keyCode){
                case 37:
                left = false;
                break;
                case 38:
                up = false;
                break;
                case 39:
                right = false;
                break;
                case 40:
                down = false;
                break;
            }
        }
        private function createTextBoxes():void
        {
            //creating textboxes
            addChild(powerBox);
            powerBox.type = TextFieldType.INPUT;
            powerBox.x = 200;
            powerBox.y = 200;
            powerBox.height = 20;
            powerBox.border = true;
            powerBox.text = String(car.power);
            //label
            addChild(powerLabel);
            powerLabel.text = "Power";
            powerLabel.x = 120;
            powerLabel.y = 200;

            addChild(dragBox);
            dragBox.type = TextFieldType.INPUT;
            dragBox.x = 200;
            dragBox.y = 240;
            dragBox.height = 20;
            dragBox.border = true;
            dragBox.text = String(car.drag);
            //label
            addChild(dragLabel);
            dragLabel.text = "Drag";
            dragLabel.x = 120;
            dragLabel.y = 240;

            addChild(turnspeedBox);
            turnspeedBox.type = TextFieldType.INPUT;
            turnspeedBox.x = 200;
            turnspeedBox.y = 280;
            turnspeedBox.height = 20;
            turnspeedBox.text = String(car.turnSpeed);
            turnspeedBox.border = true;
            //label
            addChild(turnspeedLabel);
            turnspeedLabel.text = "TurnSpeed";
            turnspeedLabel.x = 120;
            turnspeedLabel.y = 280;

            addChild(angulardragBox);
            angulardragBox.type = TextFieldType.INPUT;
            angulardragBox.x = 200;
            angulardragBox.y = 320;
            angulardragBox.height = 20;
            angulardragBox.text = String(car.angularDrag);
            angulardragBox.border = true;
            //label
            addChild(angulardragLabel);
            angulardragLabel.text = "AngularDrag";
            angulardragLabel.x = 120;
            angulardragLabel.y = 320;
        }

    }
}