[AS3] Help with basic game code

[juuri]

I'm extremely new to Actionscript and am trying to make a basic bouncing ball game like the one in the DevNote Tutorial 'Intro to Flash Game Programming' on Youtube

However, I want the ball to enter the stage at the beginning of the game.

I would also like to add another dynamic text field that counts the rounds of the game (i.e. when a person drops the ball the first time, the Rounds counter goes to 1 when the drop it a second time it goes to 2 etc.) and at the end of the third round I want the game to end.

If anyone could post some script that would do what i have outlined above I would be very appreciative!

thanks in advance!

[benjio21]

Why don't you have a go yourself and then ask us for help. The pros and forum users are not here to do it for you. That's what tutorials are for.

Ben

[MrAbrman]

This is the code I'd use. on stage I would have text field with instance name "rounds_txt" and a button with a instance name "add_btn" when the ball falls it should be a hittest with the area below the stage or a comparison between the ball position on y and stage height but for example I just use a button that would be that event ingame.

1st I create a variabile storing my round number,
Then I created the EventListener for the button, you should use
addEventListener(Event.ENTER_FRAME, onEnterFrame);
function onEnterFrame (e:Event) :void {
if (ball.y >= stage.y){
ball.x = 100 //the x position where the ball should start to avoid adding more rounds than one per fall
ball.y = 100 //the y position where the ball should start
rounds_num += 1
if (rounds_num <= 3){
trace("3");
}
}
In the game :P
and at the end there is a EnterFrame Event which puts our variabile that stores the round number in the text bux for the user to see it :P

import flash.events.MouseEvent;
import flash.events.Event;

var rounds_num:Number = 0

add_btn.addEventListener(MouseEvent.CLICK, oneup)
function oneup(e:MouseEvent) :void {
rounds_num += 1 //Could use rounds_num = rounds_num + 1 also
if (rounds_num >= 3){ //>= means 3 or more, == would be exactly 3
trace("3");
}
}

addEventListener(Event.ENTER_FRAME, onEnterFrame);
function onEnterFrame (e:Event) :void {
rounds_txt.text = String(rounds_num);

}

Hope I was helpful :)

[MrAbrman]

And Ben I actually helped him :PP I get practice, cause I'm new to AS and really need it and I get posts so I will be able to add links xD
Anyways if you're good with AS3 and you feel like helping me out please check showthread.php3?t=261476

[benjio21]

If you want to make it more realistic you should add gravity & x&y velocity
Ben
This is the code I'd use. on stage I would have text field with instance name "rounds_txt" and a button with a instance name "add_btn" when the ball falls it should be a hittest with the area below the stage or a comparison between the ball position on y and stage height but for example I just use a button that would be that event ingame.

1st I create a variabile storing my round number,
Then I created the EventListener for the button, you should use
addEventListener(Event.ENTER_FRAME, onEnterFrame);
function onEnterFrame (e:Event) :void {
if (ball.y >= stage.y){
ball.x = 100 //the x position where the ball should start to avoid adding more rounds than one per fall
ball.y = 100 //the y position where the ball should start
rounds_num += 1
if (rounds_num <= 3){
trace("3");
}
}
In the game :P
and at the end there is a EnterFrame Event which puts our variabile that stores the round number in the text bux for the user to see it :P

import flash.events.MouseEvent;
import flash.events.Event;

var rounds_num:Number = 0

add_btn.addEventListener(MouseEvent.CLICK, oneup)
function oneup(e:MouseEvent) :void {
rounds_num += 1 //Could use rounds_num = rounds_num + 1 also
if (rounds_num >= 3){ //>= means 3 or more, == would be exactly 3
trace("3");
}
}

addEventListener(Event.ENTER_FRAME, onEnterFrame);
function onEnterFrame (e:Event) :void {
rounds_txt.text = String(rounds_num);

}

Hope I was helpful :)

[juuri]

thanks so much for the code! I'm not sure if it will work with the code i've already put in though... this is what i had so far:

package
{
import flash.display.MovieClip
import flash.text.TextField
import flash.events.Event
import flash.events.MouseEvent

public class DocumentMain extends MovieClip
{
public const GRAVITY:Number = 2;
public const BOUNCE_FACTOR:Number = 0.8;
public const HIT_FORCE:Number = 20;

public var _bounces:TextField;
public var _highscore:TextField;
public var _ball:Ball;

private var _vx:Number;
private var _vy:Number;

public function DocumentMain():void
{
_vx = 10;
_vy = 0;

_ball.buttonMode = true;

addEventListener(Event.ENTER_FRAME, enterFrameHandler);
addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
}

private function enterFrameHandler(e:Event):void
{
// gravitate the ball
_vy += GRAVITY;

// move the ball
_ball.x += _vx;
_ball.y += _vy;

// check stage boundaries for collision
checkBoundaryCollision();
}

private function mouseDownHandler(e:MouseEvent):void
{
// hit the ball if it has been clicked
if (e.target == _ball)
{
hit(e.target.mouseX, e.target.mouseY);
}
}

private function checkBoundaryCollision():void
{
var left:Number;
var right:Number;
var bottom:Number;
var top:Number;

left = _ball.x - (_ball.width / 2);
right = _ball.x + (_ball.width / 2);
bottom = _ball.y + (_ball.height / 2);
top = _ball.y - (_ball.height / 2);

if (left < 0 && _vx < 0)
{
_ball.x = _ball.width / 2;
_vx *= -1;
}
else if (right > stage.stageWidth && _vx > 0)
{
_ball.x = stage.stageWidth - (_ball.width / 2);
_vx *= -1;
}
if (top < 0 && _vy < 0)
{
_ball.y = _ball.height / 2;
_vy *= -1;
}
else if (bottom > stage.stageHeight && _vy > 0)
{
_ball.y = stage.stageHeight - (_ball.height / 2);
_vy *= -BOUNCE_FACTOR;
_vx *= BOUNCE_FACTOR;

if (Number(_bounces.text) > Number(_highscore.text))
{
_highscore.text = _bounces.text;
}
_bounces.text = "0";
}
}

private function hit(hitX:Number, hitY:Number):void
{
// increment bounces
_bounces.text = String(Number(_bounces.text) + 1);

// adjust the vertical velocity of the ball
if (_vy > 0)
{
_vy *= -BOUNCE_FACTOR / 2;
}
_vy -= HIT_FORCE;

// adjust the horizontal velocity of the ball
if (_vx * hitX > 0)
{
_vx *= -BOUNCE_FACTOR;
}

_vx -= (hitX / _ball.width) * HIT_FORCE;
}
}
}

So if I were to add _rounds as a dynamic text field on the stage and put in public var _rounds:TextField; near the beginning where i establish my other variables that would set me up to be able to use it later in the code right?

then could I alter my last section of the private function checkBoundaryCollision():void section of the code to be:

if (bottom > stage.stageHeight && _vy > 0)

{

_ball.y = stage.stageHeight - (_ball.height / 2);

_vy *= -BOUNCE_FACTOR;

_vx *= BOUNCE_FACTOR;



if (Number(_bounces.text) > Number(_highscore.text))

{

_highscore.text = _bounces.text;

}

_bounces.text = "0";
_rounds.text += 1

}
so that when the ball hits the ground the rounds go up by one.
Am I right so far?

Now I'm confused as to how i should integrate the code that you gave me. Because the next thing i need to do is make it so that when the _rounds variable textbox shows greater than three (so at the end of the third round) the game terminates.

thanks so much in advance!