Question

I am making a platformer game. But I am having issue because whenever I pressed the spacebar to jump, the character will stuck in the mid-air. However, I can resolved the problem by holding spacebar and the character will land.

The issue is at mainJump() located inside Boy class.

I seen many people solved the problem by using action timeline, but my main problem is, are there anyway I can solve the problem by using an external class?

Main class

package 
{
import flash.display.*;
import flash.text.*;
import flash.events.*;
import flash.utils.Timer;
import flash.text.*;

public class experimentingMain extends MovieClip 
{
    var count:Number = 0;
    var myTimer:Timer = new Timer(10,count);

    var classBoy:Boy;

    //var activateGravity:gravity = new gravity();

    var leftKey, rightKey, spaceKey, stopAnimation:Boolean;

    public function experimentingMain() 
    {
        myTimer.addEventListener(TimerEvent.TIMER, scoreUp);
        myTimer.start();

        classBoy = new Boy();
        addChild(classBoy);


        stage.addEventListener(KeyboardEvent.KEY_DOWN, pressTheDamnKey);
        stage.addEventListener(KeyboardEvent.KEY_UP, liftTheDamnKey);
    }

    public function pressTheDamnKey(event:KeyboardEvent):void
    {
        if (event.keyCode == 37)
        {
            leftKey = true;
            stopAnimation = false;
        }

        if (event.keyCode == 39)
        {
            rightKey = true;
            stopAnimation = false;
        }

        if (event.keyCode == 32)
        {
            spaceKey = true;
            stopAnimation = true;
        }
    }

    public function liftTheDamnKey(event:KeyboardEvent):void
    {
        if (event.keyCode == 37)
        {
            leftKey = false;
            stopAnimation = true;
        }

        if (event.keyCode == 39)
        {
            rightKey = false;
            stopAnimation = true;
        }

        if (event.keyCode == 32)
        {
            spaceKey = false;
            stopAnimation = true;
        }
    }

    public function scoreUp(event:TimerEvent):void 
    {
        scoreSystem.text = String("Score : "+myTimer.currentCount);
    }

}
    }

Boy class

package 
{
import flash.display.*;
import flash.events.*;

public class Boy extends MovieClip
{
    var leftKeyDown:Boolean = false;
    var upKeyDown:Boolean = false;
    var rightKeyDown:Boolean = false;
    var downKeyDown:Boolean = false;
    //the main character's speed
    var mainSpeed:Number = 5;
    //whether or not the main guy is jumping
    var mainJumping:Boolean = false;
    //how quickly should the jump start off
    var jumpSpeedLimit:int = 40;
    //the current speed of the jump;
    var jumpSpeed:Number = 0;

    var theCharacter:MovieClip;

    var currentX,currentY:int;

    public function Boy()
    {
        this.x = 600;
        this.y = 540;

        addEventListener(Event.ENTER_FRAME, boyMove);
    }

    public function boyMove(event:Event):void
    {
        currentX = this.x;
        currentY = this.y;

        if (MovieClip(parent).leftKey)
        {
            currentX +=  mainSpeed;
            MovieClip(this).scaleX = 1;
        }

        if (MovieClip(parent).rightKey)
        {
            currentX -=  mainSpeed;
            MovieClip(this).scaleX = -1;
        }

        if (MovieClip(parent).spaceKey)
        {
            mainJump();
        }

        this.x = currentX;
        this.y = currentY;
    }

    public function mainJump():void
    {
        currentY = this.y;


        if (! mainJumping)
        {

            mainJumping = true;
            jumpSpeed = jumpSpeedLimit * -1;
            currentY +=  jumpSpeed;
        }
        else
        {
            if (jumpSpeed < 0)
            {
                jumpSpeed *=  1 - jumpSpeedLimit / 250;
                if (jumpSpeed > -jumpSpeedLimit/12)
                {
                    jumpSpeed *=  -2;
                }
            }
        }
        if (jumpSpeed > 0 && jumpSpeed <= jumpSpeedLimit)
        {
            jumpSpeed *=  1 + jumpSpeedLimit / 120;
        }
        currentY +=  jumpSpeed;

        if (currentY >= stage.stageHeight - MovieClip(this).height)
        {
            mainJumping = false;
            currentY = stage.stageHeight - MovieClip(this).height;
        }
    }
    }
    }

Answer 1

You’ve got a mainJumping variable that is only true while the jump is running. Why not just use that?

if (MovieClip(parent).spaceKey || mainJumping)
{
    mainJump();
}