Continuos Timer and object for a game AS3 - actionscript-3

I am currently working on a game where you need to survive as long as possible while dodging questions that come your way. (all with AS3)
At the moment I am going from 1 scene to another in between the game field and the question field, but everytime I go to the question scene the timer in the game scene resets itself. I was wondering if it was possible to have the timer continue while being in the question scene?
Also I have a movable character in between the menus which incidentally are also made in different scenes and the player is able to move him around, and I would very much like him to stay in the last position he was in the next screen, as in I move him to the top right in the main menu and when I go to the options menu I want him to still be in the top right and not in his initial position.
As for my timer this is the code I am using at the moment:
import flash.utils.Timer;
import flash.events.Event;
import flash.events.TimerEvent;
import flash.globalization.DateTimeFormatter;
var timer:Timer = new Timer(100);
timer.start();
timer.addEventListener(TimerEvent.TIMER, timerTickHandler);
var timerCount:int = 0;
function timerTickHandler(Event:TimerEvent):void
{
timerCount += 100;
toTimeCode(timerCount);
}
function toTimeCode(milliseconds:int) : void {
//create a date object using the elapsed milliseconds
var time:Date = new Date(milliseconds);
//define minutes/seconds/mseconds
var minutes:String = String(time.minutes);
var seconds:String = String(time.seconds);
var miliseconds:String = String(Math.round(time.milliseconds)/100);
//add zero if neccecary, for example: 2:3.5 becomes 02:03.5
minutes = (minutes.length != 2) ? '0'+minutes : minutes;
seconds = (seconds.length != 2) ? '0'+seconds : seconds;
//display elapsed time on in a textfield on stage
timer_txt.text = minutes + ":" + seconds+"." + miliseconds;
}
And my character is using this code:
/* Move with Keyboard Arrows
Allows the specified symbol instance to be moved with the keyboard arrows.
Instructions:
1. To increase or decrease the amount of movement, replace the number 5 below with the number of pixels you want the symbol instance to move with each key press.
Note the number 5 appears four times in the code below.
*/
var upPressed:Boolean = false;
var downPressed:Boolean = false;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
rutte.addEventListener(Event.ENTER_FRAME, fl_MoveInDirectionOfKey);
stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_SetKeyPressed);
stage.addEventListener(KeyboardEvent.KEY_UP, fl_UnsetKeyPressed);
function fl_MoveInDirectionOfKey(event:Event)
{
if (upPressed)
{
rutte.y -= 5;
}
if (downPressed)
{
rutte.y += 5;
}
if (leftPressed)
{
rutte.x -= 5;
rutte.scaleX = 1; // face left
}
if (rightPressed)
{
rutte.x += 5;
rutte.scaleX = -1; // face right
}
}
function fl_SetKeyPressed(event:KeyboardEvent):void
{
switch (event.keyCode)
{
case Keyboard.UP:
{
upPressed = true;
break;
}
case Keyboard.DOWN:
{
downPressed = true;
break;
}
case Keyboard.LEFT:
{
leftPressed = true;
break;
}
case Keyboard.RIGHT:
{
rightPressed = true;
break;
}
}
}
function fl_UnsetKeyPressed(event:KeyboardEvent):void
{
switch (event.keyCode)
{
case Keyboard.UP:
{
upPressed = false;
break;
}
case Keyboard.DOWN:
{
downPressed = false;
break;
}
case Keyboard.LEFT:
{
leftPressed = false;
break;
}
case Keyboard.RIGHT:
{
rightPressed = false;
break;
}
Thank you in advance for all the help you can give me.
Kind Regards.

in flash there is a fundamental aspect of how timeline and scenes works. Once you move away from a frame to another frame, The content of the frame and it's properties/states/actions are gone and reseted.
Personally I recommend you use a single scene with a timeline divided into frames labeled, there you can specify a layer for the actions and global variables, one for the user interface and another one for the specific actions of each frame. example:
So you never lose the reference of variables because the frame is not constantly recreated, all your important actions, including you timer, should be in your first frame.
I was testing, here you can see a working example: http://db.tt/FZuQVvt3. Here you can download the FLA file to be used as a base for your project: http://db.tt/RHG9G5lo

Related

Speed keeps stacking in actionscript 3.0

We have been making this game for our class CPT and you play as a character and try to get through these levels but the issue is that every time you die and go back to play the level again the speed stacks on top of the previous speed to a point where the game isn't even playable anymore. We have tried resetting it and setting it back to 0 but nothing seems to work we also tried to code it so that is the speed goes past 21 it resets back to 20 (our ideal speed) we also tried to remove extra event listeners that could have been stacking on top of the other. and if you do happen to die but get to the next frame the speed goes back to 20 for that frame.But if you die on that frame it doubles the speed on that frame too.Our code is:
import flash.events.Event;
import flash.display.MovieClip;
//makes the character jump
var grav:Number = 10;
var jumping:Boolean = false;
var jumpPow:Number = 0;
stage.addEventListener(KeyboardEvent.KEY_DOWN, whenKeyPressed);
stage.addEventListener(Event.ENTER_FRAME, update);
function whenKeyPressed(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.UP)
{
if(jumping != true)
{
jumpPow = -50;
jumping = true;
}
}
}
function update(event:Event):void
{
if(jumping)
{
player_mc.y += jumpPow;
jumpPow += grav;
if(player_mc.y >= stage.stageHeight)
{
jumping = false;
player_mc.y = stage.stageHeight;
}
}
//when the character makes it to the other side of the screen, the frame
changes
if (player_mc.hitTestObject(frameChanger1))
{
gotoAndStop(91);
}
//end the game when the character touches the penguin
if (player_mc.hitTestObject(penguin1))
{
gotoAndStop(89);
}
}
//makes the character move left and right
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
player_mc.addEventListener(Event.ENTER_FRAME, moveInDirectionOfKey);
stage.addEventListener(KeyboardEvent.KEY_DOWN, setKeyPressed);
stage.addEventListener(KeyboardEvent.KEY_UP, unsetKeyPressed);
function moveInDirectionOfKey(event:Event)
{
if (leftPressed)
{
player_mc.x -= 20;
}
if (rightPressed)
{
player_mc.x += 20;
}
}
function setKeyPressed(event:KeyboardEvent):void
{
switch (event.keyCode)
{
case Keyboard.LEFT:
{
leftPressed = true;
break;
}
case Keyboard.RIGHT:
{
rightPressed = true;
break;
}
}
}
function unsetKeyPressed(event:KeyboardEvent):void
{
switch (event.keyCode)
{
case Keyboard.LEFT:
{
leftPressed = false;
break;
}
case Keyboard.RIGHT:
{
rightPressed = false;
break;
}
}
//when the character makes it to the other side of the screen, the frame
changes
if (player_mc.hitTestObject(frameChanger1))
{
gotoAndStop(91);
}
//end the game when the character touches the penguin
if (player_mc.hitTestObject(penguin1))
{
gotoAndStop(89);
}
}
Did You tried :
if(!stage.hasEventListener(Event.ENTER_FRAME)){
stage.addEventListener(Event.ENTER_FRAME, update);
}
if(!stage.hasEventListener(KeyboardEvent.KEY_DOWN)){
stage.addEventListener(KeyboardEvent.KEY_DOWN, setKeyPressed);
}
if(!stage.hasEventListener(KeyboardEvent.KEY_UP)){
stage.addEventListener(KeyboardEvent.KEY_UP, unsetKeyPressed);
}
if(!player_mc.hasEventListener(Event.ENTER_FRAME)){
player_mc.addEventListener(Event.ENTER_FRAME, moveInDirectionOfKey);
}
And so on...
Otherwise You will register the Events multiple times...
This may be the issue.
I'm not sure, I avoid to code on multiple frames.
You may also use the answer of #Philarmon here Function being called faster

stop() caller not working properly

I am making a brick breaker game with three frames. The first frame is the start screen, the second frame is the game itself, and the third frame is the "game over" screen (with a try again button). When I hit "Start game" the program jumps to the second frame and stops. If you fail to hit the ball with the racket, the program jumps to frame three.
My problem occurs here, because the program instantly jumps to the second frame again. Any idea why the stop(); caller fails to work? I have tried to remove all content from the last frame (except for the stop(); caller), but it still just skips back to frame 2.
I really can't figure out why this is happening. I am using Adobe Flash Professional CC. The only actionscript on frame 3 are "stop();". This is the entire code block on frame 2:
import flash.events.KeyboardEvent;
import flash.display.Stage;
import flash.events.Event;
import flash.ui.Keyboard;
import fl.transitions.Tween;
import fl.transitions.easing.*;
trace(currentFrame);
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown);
this.addEventListener(Event.ENTER_FRAME, moveBall);
var rackert: bar = new bar();
rackert.name = "rackert";
rackert.y = 740;
rackert.x = 640;
addChild(rackert);
var ball: circle = new circle();
ball.y = 80;
ball.x = 640;
addChild(ball);
var ballXSpeed: Number = 12; //X Speed of the Ball
var ballYSpeed: Number = 12; //Y Speed of the Ball
function keyDown(e: KeyboardEvent) {
var key: uint = e.keyCode;
var step: uint = 35;
switch (key) {
case Keyboard.LEFT:
if (rackert.x > 0) {
var myTween: Tween = new Tween(rackert, "x", Regular.easeOut, rackert.x, rackert.x - step, 0.2, true);
} else rackert.x = 0;
break;
case Keyboard.RIGHT:
if (rackert.x + rackert.width < 1000) {
var myTween2: Tween = new Tween(rackert, "x", Regular.easeOut, rackert.x, rackert.x + step, 0.2, true);
} else rackert.x = 1000 - rackert.width;
break;
}
}
var gameOver: Boolean = false;
function moveBall(event: Event): void {
ball.x += ballXSpeed;
ball.y += ballYSpeed;
if (ball.x >= 1000 - (ball.width / 2)) {
ballXSpeed *= -1;
}
if (ball.x <= 0 + (ball.width / 2)) {
ballXSpeed *= -1;
}
if (ball.y >= stage.stageHeight) {
if (gameOver == false) {
gotoAndStop(3);
this.removeEventListener(Event.ENTER_FRAME, moveBall);
stage.removeEventListener(KeyboardEvent.KEY_DOWN, keyDown);
gameOver = true;
rackert.visible = false;
}
}
if (ball.y <= 22) {
ballYSpeed *= -1;
}
if (ball.hitTestObject(rackert)) {
calcBallAngle();
}
}
function calcBallAngle(): void {
var ballPosition: Number = ball.x - rackert.x;
trace("Position: " + ballPosition);
var hitPercent: Number = (ballPosition / (rackert.width - ball.width)) - .7;
trace("percent: " + hitPercent);
ballXSpeed = hitPercent * 10;
ballYSpeed *= -1;
}
function getRandom(min: Number, max: Number): Number {
return min + (Math.random() * (max - min));
}
Change this:
if (gameOver == false) {
gotoAndPlay(3); //gotoAndPlay(); caller
gameOver = true;
rackert.visible = false;
}
To:
if (gameOver == false) {
gotoAndStop(3); //gotoAndPlay(); caller
gameOver = true;
rackert.visible = false;
}
Difference is goToAndStop(). The default behavior is to "loop" an animation, so you tell it to go to frame 3 (last frame) and it "plays" through that frame back around to 1, then 2, where you most likely have a frame script that calls stop(); to stop the play head.
Update
I believe you that you're calling stop(); in frame 3. It seems like it should work and indeed it actually is, it's just not working on the object that you're expecting it to work on. Since you're using a frame script, stop(); is being called on the InteractiveObject who's scope the frame script is inside of. Let me clarify.
Frame 3 Of Stage
-> Child on frame three called FrameScriptsArePITA
-> Double click FrameScriptsArePITA and write a frame script "stop()", the script will do nothing but stop FrameScriptsArePITA from playing.
Watch your scope. That's part of why frame scripts are... best to avoid. Using your own DocumentClass and hooking everything in your design view into corresponding classes will make things easier to solve in AS3.
I finally found the issue. I had a timer event on frame 1, which caused the bug. I simply used removeEventListener for the timer function where i skip to frame 2. As Technick Empire said, you should always be cleaning up anything including even listeners as they can even interfere with the garbage collector and cause memory leaks.

as3 navigation - gotoAndPlay script not working consistently

I think I've made an error in logic somewhere but can't find it, I have a movie clip which contains 4 further animated movieclips, each with stop() actions at specific frames, and 2 buttons, 1 to move left and another to move right, the animations work as expected if the user clicks say right, right, right, right, left, left, left, left for the first time, but then things stop evaluating properly.
Am using switch case statements on a variable to pick out the mc to animate, would I be better of using an If Else statement? Heres my code, as may be obvious actionscript is not my forte!
import flash.display.StageScaleMode;
import flash.display.StageAlign;
import flash.events.Event;
import fl.text.TLFTextField;
import fl.transitions.Tween;
import fl.transitions.easing.*;
import fl.transitions.TweenEvent;
// Global variables
var mcWidth:int = 768;
var mcPosInc:int = 0;
var boxAnimPlay:int = 1;
var mcMoving:Boolean = false;
var buttonClicked:String = "right";
var mcLeft;
var mcRight;
addEventListener(Event.ENTER_FRAME, frameHandler);
// frame Handler
function frameHandler(event:Event):void
{
// Initialize button click events
controlGrp.bttn_left.addEventListener(MouseEvent.CLICK, goLeft);
controlGrp.bttn_right.addEventListener(MouseEvent.CLICK, goRight);
function goLeft(e:MouseEvent):void {
buttonClicked = "left";
// change position
if (mcPosInc > 0 && mcMoving == false) {
mcMoving = true;
mcPosInc --;
boxAnimPlay --;
// Scroll mc1
mcLeft = new Tween(mc1, "x", Regular.easeOut, mc1.x, mc1.x + mcWidth, 1.5, true);
mcLeft.addEventListener(TweenEvent.MOTION_FINISH, end);
function end(event:TweenEvent) {
mcMoving = false;
}
if (boxAnimPlay >= 1) {
switch (boxAnimPlay) {
case 3:
mc1.box4.gotoAndPlay(17);
mc1.box3.gotoAndPlay(31);
break;
case 2:
mc1.box2.gotoAndPlay(31);
mc1.box3.gotoAndPlay(46);
break;
case 1:
mc1.box1.gotoAndPlay(17);
mc1.box2.gotoAndPlay(46);
break;
}
}
trace(boxAnimPlay);
trace(buttonClicked);
}
}
}
// Play movie tests
function goRight(e:MouseEvent):void {
buttonClicked = "right";
// change position
if (mcPosInc < 3 && mcMoving == false) {
mcMoving = true;
mcPosInc ++;
boxAnimPlay ++;
// Scroll mc1
mcRight = new Tween(mc1, "x", Regular.easeOut, mc1.x, mc1.x - mcWidth, 1.5, true);
mcRight.addEventListener(TweenEvent.MOTION_FINISH, end);
function end(event:TweenEvent) {
mcMoving = false;
}
if (boxAnimPlay <= 4) {
switch (boxAnimPlay) {
case 1:
break;
case 2:
mc1.box1.gotoAndPlay(1);
mc1.box2.gotoAndPlay(1);
break;
case 3:
mc1.box2.gotoAndPlay(16);
mc1.box3.gotoAndPlay(1);
break;
case 4:
mc1.box3.gotoAndPlay(16);
mc1.box4.gotoAndPlay(1);
break;
}
}
trace(boxAnimPlay);
trace(buttonClicked);
}
// Add Text Labels to TitleGroup
switch (boxAnimPlay) {
case 1:
readout.text = "test";
break;
}
}
I fixed it, basically the frames I was targeting in the gotoAndPlay contained stop() statements, once I targeted the subsequent frames, ie
Instead of:
switch (boxAnimPlay) {
case 3:
mc1.box4.gotoAndPlay(17);
mc1.box3.gotoAndPlay(31);
break;
case 2:
mc1.box2.gotoAndPlay(31);
mc1.box3.gotoAndPlay(46);
break;
case 1:
mc1.box1.gotoAndPlay(17);
mc1.box2.gotoAndPlay(46);
break;
}
I used this:
switch (boxAnimPlay) {
case 3:
mc1.box4.gotoAndPlay(17);
mc1.box3.gotoAndPlay(32); // no stop on subsequent frame
break;
case 2:
mc1.box2.gotoAndPlay(32); // no stop on subsequent frame
mc1.box3.gotoAndPlay(47); // no stop on subsequent frame
break;
case 1:
mc1.box1.gotoAndPlay(17);
mc1.box2.gotoAndPlay(47); // no stop on subsequent frame
break;
}

Adding Time Delay to Character Movement

I've been looking to make an animation using ActionScript 3.0 in Adobe Flash Professional where a character (John) can be moved by the viewer using the arrow keys. I've made two sprites, John (the default standing character) and JohnLeg (the character with a raised leg), and I switch between them when the up key is pressed to make it look like he is walking. I've tried this by making one invisible and the other visible.
However, at the moment it only shows JohnLeg for 0 seconds, so I believe I need to set a time delay when he moves to show JohnLeg for half a second before switching back.
My code only considers the up key at the moment, and most of it was taken using the code snippets in Adobe Flash:
var upPressed:Boolean = false;
John.addEventListener(Event.ENTER_FRAME, fl_MoveInDirectionOfKey_4);
stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_SetKeyPressed_4);
stage.addEventListener(KeyboardEvent.KEY_UP, fl_UnsetKeyPressed_4);
function fl_MoveInDirectionOfKey_4(event:Event)
{
JohnLeg.visible = false;
JohnLeg.x = John.x
JohnLeg.y = John.y
if (upPressed)
{
JohnLeg.visible = true;
John.visible = false;
John.y -= 5;
//set time delay here
JohnLeg.visible = false;
John.visible = true;
}
}
function fl_SetKeyPressed_4(event:KeyboardEvent):void
{
switch (event.keyCode)
{
case Keyboard.UP:
{
upPressed = true;
break;
}
}
function fl_UnsetKeyPressed_4(event:KeyboardEvent):void
{
switch (event.keyCode)
{
case Keyboard.UP:
{
upPressed = false;
break;
}
You could try setTimeout.
Here it some help doc http://help.adobe.com/en_US/AS2LCR/Flash_10.0/help.html?content=00000602.html

How to do you get an character to jump?

This is my fist time ever needing to use this for one of my games. I want to have the character jump. I have been trying to get this result for about an hour, but with no luck =( I am using AS3, and flash CS5.5. So far all my code does is make the character go left, and right based on keyboard input. Could someone please help?
Here is my code so far:
public class Dodgeball extends MovieClip
{
public var character:Character;
public var rightDown:Boolean = false;
public var leftDown:Boolean = false;
public var speed:Number = 3;
public var timer:Timer;
public function Dodgeball()
{
character= new Character();
addChild(character);
stage.addEventListener(KeyboardEvent.KEY_DOWN, myKeyDown);
stage.addEventListener(KeyboardEvent.KEY_UP, MyKeyUp);
timer = new Timer(24);
timer.addEventListener(TimerEvent.TIMER, moveClip);
timer.start();
}
public function myKeyDown(event:KeyboardEvent):void
{
if (event.keyCode == Keyboard.RIGHT)
{
rightDown = true;
if(character.currentLabel != "walkingRight")
{
character.gotoAndStop ("walkingRight");
}
}
if (event.keyCode == Keyboard.LEFT)
{
leftDown = true;
if (character.currentLabel != "backingUp")
{
character.gotoAndStop("backingUp");
}
}
}
public function MyKeyUp(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.RIGHT)
{
character.gotoAndStop("standing");
rightDown = false;
}
if (event.keyCode == Keyboard.LEFT)
{
character.gotoAndStop("standingLeft");
leftDown = false;
}
}
public function moveClip(event:TimerEvent):void
{
if (rightDown)
{
character.x += speed;
}
if (leftDown)
{
character.x -=speed;
}
event.updateAfterEvent();
}
}
}
One method you can try is found here: http://www.actionscript.org/forums/showthread.php3?t=256009 Like your speed variable, grav determines the vertical position of the character.
var grav:Number = 10;
var jumping:Boolean = false;
var jumpPow:Number = 0;
stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
stage.addEventListener(Event.ENTER_FRAME, update);
function onKeyDown(evt:KeyboardEvent):void
{
if(evt.keyCode == Keyboard.UP)
{
if(jumping != true)
{
jumpPow = -50;
jumping = true;
}
}
}
function update(evt:Event):void
{
if(jumping)
{
player_mc.y += jumpPow;
jumpPow += grav;
if(player_mc.y >= stage.stageHeight)
{
jumping = false;
player_mc.y = stage.stageHeight;
}
}
}
Edit: Jason's method is fine, but I'm not sure if it would be useful if you plan to have some kind of collision detection.
What I would do is create a motion tween of the character jumping. then call gotoAndPlay on that frame, and on the last frame of the tween put a stop, or a gotoAndStop on the "stationary" frame, or whatever frame represents a neutral position.
if (event.keyCode == Keyboard.SHIFT)
{
character.gotoAndPlay("simpleJump");
jumpDown = false;
}
This will give you the greatest animation control over the look and feel. You could also do it programmatically, but personally, I recommend against it. It will take less time to set it up, and you can tweak and refine the jump animations later. You could make several types of jump animations based on object near the target etc.
I would also change this stuff:
if(character.currentLabel != "walkingRight")
By defining a new function where you have all the rules for when and where something can be done, so that in your control logic, you just call
if(characterCan(character,"walkright")) ...
Where characterCan(String) is a method that check if this is possible. For instance, if you are jumping and shooting, you obviously cannot walk right, so in the end, you will have to start adding pieces of logic into those if statements and it's gonna become a cluttered mess.
A very simple approach is to have a vertical speed as well as a horizontal speed.
When the user presses "UP" or "JUMP", set y speed to a negative value and update it in your movieClip function. When the character gets to a certain height, reverse the speed.
Using gravity and acceleration looks better but this is a really good place to start. Look into kinematic equations to see how you would make the character accelerate.
public var originalY;
public function myKeyDown(event:KeyboardEvent):void
{
if (event.keyCode == Keyboard.UP && vSpeed == 0)
{
originalY = character.y;
ySpeed = -1;
}
}
public function moveClip(event:TimerEvent):void
{
if (vSpeed != 0)
{
character.y += vSpeed;
/* make the character fall down after reaching max jump height */
if(originalY - character.y > jumpHeight) {
vSpeed = vSpeed * -1;
}
/* level the character after he's hit the ground (so he doesn't go through) */
else if(character.y >= originalY) {
character.y = originalY;
vSpeed = 0;
}
}
}