Prototype of platform game
try my three levels simple platform game
http://goldenstudios.uni.cc/contents/products/games/bin/platform.jnlp
any bugs?
thank you
Ran fine. You should have some sort of loading screen in the beginning though.
Similar Messages
-
Error #1009 in my Platform Game! Please Help!!!
In my basic platform game I have a "hero" that can walk and jump on the "ground." There is also a door to the next scene, which is the next level.The first scene works fine, but "TypeError: Error #1006: value is not a function. at Charles3_fla::MainTimeline/frame1()" pops up once in the output. It works however, and I'm not worried about it. The second I go throught the door though, Scene 2 opens, but then starts flashing as "TypeError: Error #1009: Cannot access a property or method of a null object reference. at Charles3_fla::MainTimeline/onenter()" pops up A LOT in the output. I don't know how to fix it, and would like help. P.S. I am using Adobe CS5 with actionscript 3
Here is the code for Scene 1:
hero.gotoAndStop('still');
var Key:KeyObject = new KeyObject(stage);
var vy:Number=0;
var gravity:Number=2;
var jumped:Boolean = false;
stage.addEventListener(Event.ENTER_FRAME,onenter)(true);
function onenter(e:Event):void{
vy+=gravity;
if(! ground.hitTestPoint(hero.x,hero.y,true)) {
hero.y+vy;
if(ground.hitTestPoint(hero.x+(hero.width/2), hero.y-(hero.height/2), true)) {
hero.x-=13;
if(ground.hitTestPoint(hero.x-(hero.width/2), hero.y-(hero.height/2), true)) {
hero.x+=13;
if (vy>10) {
vy=10;
for (var i:int = 0; i<10; i++) {
if (ground.hitTestPoint(hero.x,hero.y,true)) {
hero.y--;
vy=6;
jumped=true;
if(door.hitTestObject(hero)){
gotoAndPlay(1,"Scene 2");
if(hero.y>300){
vy=6;
jumped=true;
if(Key.isDown(Key.UP) && jumped){
vy=-13;
jumped=false;
hero.y+=vy;
if(Key.isDown(Key.RIGHT)){
hero.x+=10;
hero.scaleX=1;
hero.gotoAndStop('walking');
}else if(Key.isDown(Key.LEFT)){
hero.x-=10;
hero.scaleX=-1;
hero.gotoAndStop('walking');
}else{
hero.gotoAndStop('still');
And for Scene 2...
hero.gotoAndStop('still');
var Key1:KeyObject =KeyObject(stage);
var vy1:Number=0;
var gravity1:Number=2;
var jumped1:Boolean = false;
stage.addEventListener(Event.ENTER_FRAME,onenter1)(true);
function onenter1(e:Event):void{
vy1+=gravity;
if(! ground.hitTestPoint(hero.x,hero.y,true)) {
hero.y+vy;
if(ground.hitTestPoint(hero.x+(hero.width/2), hero.y-(hero.height/2), true)) {
hero.x-=13;
if(ground.hitTestPoint(hero.x-(hero.width/2), hero.y-(hero.height/2), true)) {
hero.x+=13;
if (vy1>10) {
vy1=10;
for (var i:int = 0; i<10; i++) {
if (ground.hitTestPoint(hero.x,hero.y,true)) {
hero.y--;
vy1=6;
jumped1=true;
if(door.hitTestObject(hero)){
gotoAndPlay(1,"Scene 2");
if(hero.y>300){
vy1=6;
jumped1=true;
if(Key.isDown(Key.UP) && jumped1){
vy1=-13;
jumped1=false;
hero.y+=vy;
if(Key.isDown(Key.RIGHT)){
hero.x+=10;
hero.scaleX=1;
hero.gotoAndStop('walking');
}else if(Key.isDown(Key.LEFT)){
hero.x-=10;
hero.scaleX=-1;
hero.gotoAndStop('walking');
}else{
hero.gotoAndStop('still');
Please reply as soon as possible, and thanks for your time
swiatekalex555Ok sorry about my misunderstanding. Here's the code with the errors Highlighted. I also downloaded a "KeyObject.as" package, and the contents of that are on the bottom.
hero.gotoAndStop('still');
var Key:KeyObject = new KeyObject(stage);
var vy:Number=0;
var gravity:Number=2;
var jumped:Boolean = false;
stage.addEventListener(Event.ENTER_FRAME,onenter)(true);
function onenter(e:Event):void{
vy+=gravity;
if(! ground.hitTestPoint(hero.x,hero.y,true)) {
hero.y+vy;
if(ground.hitTestPoint(hero.x+(hero.width/2), hero.y-(hero.height/2), true)) {
hero.x-=13;
if(ground.hitTestPoint(hero.x-(hero.width/2), hero.y-(hero.height/2), true)) {
hero.x+=13;
if (vy>10) {
vy=10;
for (var i:int = 0; i<10; i++) {
if (ground.hitTestPoint(hero.x,hero.y,true)) {
hero.y--;
vy=6;
jumped=true;
if(door.hitTestObject(hero)){
gotoAndPlay(1,"Scene 2");
if(hero.y>300){
vy=6;
jumped=true;
if(Key.isDown(Key.UP) && jumped){
vy=-13;
jumped=false;
hero.y+=vy;
if(Key.isDown(Key.RIGHT)){
hero.x+=10;
hero.scaleX=1;
hero.gotoAndStop('walking');
}else if(Key.isDown(Key.LEFT)){
hero.x-=10;
hero.scaleX=-1;
hero.gotoAndStop('walking');
}else{
hero.gotoAndStop('still');
And for Scene 2...
hero.gotoAndStop('still');
var Key1:KeyObject =KeyObject(stage);
var vy1:Number=0;
var gravity1:Number=2;
var jumped1:Boolean = false;
stage.addEventListener(Event.ENTER_FRAME,onenter1)(true);
function onenter1(e:Event):void{
vy1+=gravity;
if(! ground.hitTestPoint(hero.x,hero.y,true)) {
hero.y+vy;
if(ground.hitTestPoint(hero.x+(hero.width/2), hero.y-(hero.height/2), true)) {
hero.x-=13;
if(ground.hitTestPoint(hero.x-(hero.width/2), hero.y-(hero.height/2), true)) {
hero.x+=13;
if (vy1>10) {
vy1=10;
for (var i:int = 0; i<10; i++) {
if (ground.hitTestPoint(hero.x,hero.y,true)) {
hero.y--;
vy1=6;
jumped1=true;
if(door.hitTestObject(hero)){
gotoAndPlay(1,"Scene 2");
if(hero.y>300){
vy1=6;
jumped1=true;
if(Key.isDown(Key.UP) && jumped1){
vy1=-13;
jumped1=false;
hero.y+=vy;
if(Key.isDown(Key.RIGHT)){
hero.x+=10;
hero.scaleX=1;
hero.gotoAndStop('walking');
}else if(Key.isDown(Key.LEFT)){
hero.x-=10;
hero.scaleX=-1;
hero.gotoAndStop('walking');
}else{
hero.gotoAndStop('still');
the KeyObject.as
package {
import flash.display.Stage;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
import flash.utils.Proxy;
import flash.utils.flash_proxy;
* The KeyObject class recreates functionality of
* Key.isDown of ActionScript 1 and 2
* Usage:
* var key:KeyObject = new KeyObject(stage);
* if (key.isDown(key.LEFT)) { ... }
dynamic public class KeyObject extends Proxy {
private static var stage:Stage;
private static var keysDown:Object;
public function KeyObject(stage:Stage) {
construct(stage);
public function construct(stage:Stage):void {
KeyObject.stage = stage;
keysDown = new Object();
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
stage.addEventListener(KeyboardEvent.KEY_UP, keyReleased);
flash_proxy override function getProperty(name:*):* {
return (name in Keyboard) ? Keyboard[name] : -1;
public function isDown(keyCode:uint):Boolean {
return Boolean(keyCode in keysDown);
public function deconstruct():void {
stage.removeEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
stage.removeEventListener(KeyboardEvent.KEY_UP, keyReleased);
keysDown = new Object();
KeyObject.stage = null;
private function keyPressed(evt:KeyboardEvent):void {
keysDown[evt.keyCode] = true;
private function keyReleased(evt:KeyboardEvent):void {
delete keysDown[evt.keyCode];
Help if you can,
swiatekalex555 -
Help Please!!! AS3 Platform game
I am creating a a platform game for one of my classes. I am not fimilar with Flash and I am having trouble with the coding. I keep getting this error message
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at TheBallMan2_fla::MainTimeline/frame4()
at flash.display::MovieClip/gotoAndStop()
at TheBallMan2_fla::MainTimeline/fl_ClickToGoToAndStopAtFrame_12()
TheBallMan2 is the name I have my project saved as.
My partner did all the coding but he doesn't really know what he is doing either. The character is supposed to move with the arrow keys which it did until we added the collision code. Here is our coding...which we got from following a tutorial online.
/* Click to Go to Frame and Stop
Clicking on the specified symbol instance moves the playhead to the specified frame in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
Instructions:
1. Replace the number 5 in the code below with the frame number you would like the playhead to move to when the symbol instance is clicked.
About.addEventListener(MouseEvent.CLICK, fl_ClickToGoToAndStopAtFrame_3);
function fl_ClickToGoToAndStopAtFrame_3(event:MouseEvent):void
gotoAndStop(2);
/* Click to Go to Frame and Stop
Clicking on the specified symbol instance moves the playhead to the specified frame in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
Instructions:
1. Replace the number 5 in the code below with the frame number you would like the playhead to move to when the symbol instance is clicked.
Help.addEventListener(MouseEvent.CLICK, fl_ClickToGoToAndStopAtFrame_4);
function fl_ClickToGoToAndStopAtFrame_4(event:MouseEvent):void
gotoAndStop(3);
/* Click to Go to Frame and Stop
Clicking on the specified symbol instance moves the playhead to the specified frame in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
Instructions:
1. Replace the number 5 in the code below with the frame number you would like the playhead to move to when the symbol instance is clicked.
PlayButton.addEventListener(MouseEvent.CLICK, fl_ClickToGoToAndStopAtFrame_12);
function fl_ClickToGoToAndStopAtFrame_12(event:MouseEvent):void
gotoAndStop(4);
/* Click to Go to Frame and Stop
Clicking on the specified symbol instance moves the playhead to the specified frame in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
Instructions:
1. Replace the number 5 in the code below with the frame number you would like the playhead to move to when the symbol instance is clicked.
if(Ground.hitTestPoint(Char.x + leftBumpPoint.x, Char.y + leftBumpPoint.y, true)){
trace("leftBumping");
leftBumping = true;
} else {
leftBumping = false;
if(Ground.hitTestPoint(Char.x + rightBumpPoint.x, Char.y + rightBumpPoint.y, true)){
trace("rightBumping");
rightBumping = true;
} else {
rightBumping = false;
if(Ground.hitTestPoint(Char.x + upBumpPoint.x, Char.y + upBumpPoint.y, true)){
trace("upBumping");
upBumping = true;
} else {
upBumping = false;
if(Ground.hitTestPoint(Char.x + downBumpPoint.x, Char.y + downBumpPoint.y, true)){
trace("downBumping");
downBumping = true;
} else {
downBumping = false;
var leftBumping:Boolean = false;
var rightBumping:Boolean = false;
var upBumping:Boolean = false;
var downBumping:Boolean = false;
var leftBumpPoint:Point = new Point(-30, -55);
var rightBumpPoint:Point = new Point(30, -55);
var upBumpPoint:Point = new Point(0, -120);
var downBumpPoint:Point = new Point(0, 0);
/* 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.
Char.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)
if (upPressed)
Char.y -= 0;
if (downPressed)
Char.y += 0;
if (leftPressed)
Char.x -= 0;
if (rightPressed)
Char.x += 0;
function fl_SetKeyPressed_4(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_4(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;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
var upPressed:Boolean = false;
var downPressed:Boolean = false;
var xScrollSpeed:int = 10;
var yScrollSpeed:int = 10;
function keyDownHandler(e:KeyboardEvent):void{
if(e.keyCode == Keyboard.LEFT){
leftPressed = true;
} else if(e.keyCode == Keyboard.RIGHT){
rightPressed = true;
} else if(e.keyCode == Keyboard.UP){
upPressed = true;
} else if(e.keyCode == Keyboard.DOWN){
downPressed = true;
function keyUpHandler(e:KeyboardEvent):void{
if(e.keyCode == Keyboard.LEFT){
leftPressed = false;
} else if(e.keyCode == Keyboard.RIGHT){
rightPressed = false;
} else if(e.keyCode == Keyboard.UP){
upPressed = false;
} else if(e.keyCode == Keyboard.DOWN){
downPressed = false;
stage.addEventListener(Event.ENTER_FRAME, loop);
var scrollX:int = 0;
var scrollY:int = 0;
var ySpeed:int = 0;
var xSpeed:int = 0;
var speedConstant:int = 5;
var friction:Number = 0.95;
function loop(e:Event):void{
if(leftPressed){
xSpeed -= speedConstant;
} else if(rightPressed){
xSpeed += speedConstant;
if(upPressed){
ySpeed -= speedConstant;
} else if(downPressed){
ySpeed += speedConstant;
if(leftBumping){
if(xSpeed < 0){
xSpeed *= -0.5;
if(rightBumping){
if(xSpeed > 0){
xSpeed *= -0.5;
if(upBumping){
if(ySpeed < 0){
ySpeed *= -0.5;
if(downBumping){
if(ySpeed > 0){
ySpeed *= -0.5;
xSpeed *= friction;
ySpeed *= friction;
scrollX -= xSpeed;
scrollY -= ySpeed;
Ground.x = scrollX;
Ground.y = scrollY;click file>publish settings>swf and tick "permit debugging". retest.
the line number of the code that references a non-existant object will be in the error message.
if you need more help than that, indicate the copy and paste the error message and the line number referenced at the top of the error message. -
I am a new programmer and ive been through a few tutorials and stuff but now i am trying to make a platform game without just typing from a tutorial. So far all ive been able to do is load and display a ground sprite. I think the next step is to somehow draw the game level using an array with letters to represent different objects(I think thats how most people do it) I have searched everywhere and so far havent found any help though.
My second question is can someone give me a list of commonly used functions that would help me develope my game.
Thanks to anyone who helps.Hi there,
I made a java game engine. I really help for those whose start learning java from gaming purposes.
It is really simple to follow, and pretty fast to create a game.
Just visit this link and download the library:
[http://fly.engine.googlepages.com/|http://fly.engine.googlepages.com]
sample game is provided.
Hope it really help you.
Good luck! -
Hi guys - Been playing super mario bros with the kids (for them of course). I'm a amateur coder but pretty clued up on AS3 - just not with gaming concepts.
I would like like to create a platform game - character jumps, climbs etc... onto platforms over objects etc...
Most coding is quite easy BUT the jumping onto the platform - has anybody got a tut out there. Been googling but fed up with so many bad tuts.
Just a bit of code for hero to land on platform.
Suppose I would just hittest and equte the x coordinates of each etc... But how do I get the hero to stand on the platform not.
Would I just stop the hero falling ie: where the hittest occurs is where the hero will stand. Would that code sit on the hero or on the platforms.OK thanks, I'll try that and I suppose I will learn a lot more.
Cheers -
Platform game - disable jump when falling
Hello everyone,
I'm making a platform game in AS3. I've sorted the left,
right and jumping movement of my character - apart from one jumping
problem:
When the up arrow key is down it sets the jump var to true.
ENTER_FRAME function detects when jump = true and it decreases the
characters y position by the var velocity while at the same time
decreasing velocity by 1.5px. So my character jumps up to a certain
height then comes down - great! There is a hit test to stop the
jump/fall.
BUT when the character falls off a platform he can still jump
when the up arrow is pressed. I've been racking my brains but I can
stop the character from jumping if its falling.
Code aqttached.
Any help would be MUCH appreciated.
Thanks,
Ryanon ENTER_FRAME the velocity var is decreasing while the jump
var is true. This is true when the up arrow as been pressed and
isn't false until the character hits the ground. Therefore pressing
the up arrow again while in the air (from a jump) dose not effect
anything.
You second answer is closer to the solution, I've tried this
approach before, but it badly effects the jump.
This 'else' part of the code controls the character to fall
if not hitting the ground:
stage.addEventListener(Event.ENTER_FRAME, hitCheck);
function hitCheck(event:Event):void
if (ball_mc.hitTestObject(ground_mc))
jump = false;
velocity = 35;
else
ball_mc.y += 16;
If I cancel the jump function in the else then as soon as the
char starts the jump and is not hitting the ground it will fall
back to the ground. I hope that makes sense?
Thanks,
Ryan
Text
Text -
Adobe Flash CS5 Platform Game Movement With Arrow Keys Help!?
Hello, I am a beginner to flash gaming. I am making a platform game, but can not reverse my character when he goes backwards. This is my code for left and right:
if (Key.isDown(Key.RIGHT)) {
_x += speed;
if (Key.isDown(Key.LEFT)) {
_x -= speed;
How Can I reverse it so when it goes LEFT, the character turns all the way around?Ok, I fiured it all out, the other way you mentioned. Just opened up the character MC, and named 2 frames. One LEFT and one RIGHT. Then I added a few simple lines of code, and turned out with this:
if (Key.isDown(Key.RIGHT)) {
_x += speed;
this.gotoAndStop("right");
if (Key.isDown(Key.LEFT)) {
_x -= speed;
this.gotoAndStop("left");
Thanks for helping!!! -
How to make a vertical lift or elevator in a platform game
I am creating a side scrolling platform game using the book "Flash Game University" by Gary Rosenzweig.
My protagonist has an instance of "hero".
My current issue is trying to create a lift or elevator to carry the player up or down. The lift is not covered in the book. My thoughts were that the lift constantly moved up and down at a pace determined by a timer. I cannot get my lift to move. I have created a movie clip called "lift" and made it exported for action script. I can make it act similar to a floor movie clip so that I can stand on it, but I cannot get the lift to move on the y axis.
I tried creating a new function called lift() and using a for loop to count between 0 and 100 using a variable "i" and then make my lift move up 1 unit for each loopcycle. It didn't work.
lift.y -= lift.y - 1;
Does anyone have a better solution?
Thanks,
AlexRob,
This worked. Here is my current code ...
var topIndex:Number = 20;
var bottomIndex:Number = 160;
var stepDistance:Number = 10;
var movingUp:Boolean = true;
public function createLift()
box = new Object();
box.mc = gamelevel.box;
public function moveMyLift():void
// lift 01
if (movingUp && box.mc.y > topIndex)
box.mc.y -= stepDistance;
else
movingUp = false;
if (!movingUp && box.mc.y < bottomIndex)
box.mc.y += stepDistance;
else
movingUp = true;
if (hero.mc.hitTestObject(box.mc))
hero.mc.y = box.mc.y;
My lift works correctly. It moves up and down correctly and when I jump on it I stay moving on it. There are only 3 things that don't make sense.
1. When I am on the elevator I cannot jump. If I am not on the elevator I can jump normally.
2. When I touch any portion of the elevator, my character automatically repositions itself to stand on the elevator. It seems normal, but not something that should happen in my scenario. I only want to "climb" on the elevator if I touch the "top" of the elevator.
3. If I add a second elevator, even with its own function, the timing of the elevator math appears to synch instead of work independently. Why? The two elevators synch their movement and timing. Also the first elevator stutters as the synching of the two elevators match thier movement and then moves in unison with the second elevator. Why are they not operating separately?
Here is the code for the first and second elevator:
private var box:Object;
private var box02:Object;
var topIndex:Number = 20;
var bottomIndex:Number = 160;
var stepDistance:Number = 10;
var movingUp:Boolean = true;
var topIndexLift02:Number = 1;
var bottomIndexLift02:Number = 100;
var stepDistanceLift02:Number = 4;
public function createLift()
box = new Object();
box.mc = gamelevel.box;
box02 = new Object();
box02.mc = gamelevel.box02;
public function moveMyLift():void
// lift 01
if (movingUp && box.mc.y > topIndex)
box.mc.y -= stepDistance;
else
movingUp = false;
if (!movingUp && box.mc.y < bottomIndex)
box.mc.y += stepDistance;
else
movingUp = true;
if (hero.mc.hitTestObject(box.mc))
hero.mc.y = box.mc.y;
public function moveMyLift02():void
// lift02
if (movingUp && box02.mc.y > topIndexLift02)
box02.mc.y -= stepDistanceLift02;
else
movingUp = false;
if (!movingUp && box02.mc.y < bottomIndexLift02)
box02.mc.y += stepDistanceLift02;
else
movingUp = true;
if (hero.mc.hitTestObject(box02.mc))
hero.mc.y = box02.mc.y;
public function gameLoop(event:Event)
// get time difference
if (lastTime == 0) lastTime = getTimer();
var timeDiff:int = getTimer() - lastTime;
lastTime += timeDiff;
// only perform tasks if in play mode
if (gameMode == "play")
moveCharacter(hero,timeDiff);
moveEnemies(timeDiff);
checkCollisions();
scrollWithHero();
createLift();
moveMyLift();
moveMyLift02();
Thank you,
Alex
Message was edited by: ajdove -
A beginner trying to create platform game
I'm a new programmer and just learning Java from the dummies books... I'm trying to make this Java platform game applet that I guess plays like Megaman/Mario/Castlevania.
Hmm my question would be that my applet slows down a lot on browsers, and I would like to learn how to double buffer as I've seen people suggest on this forum.
Also I would like to know why the sound doesn't seem to work on 99% of the people who try it.
You can check the game here: http://www.info.com.ph/~arivera/game/testmain.html
And the source code is here: http://www.info.com.ph/~arivera/game/source
Please give suggestions... my code is still very messy and unoptimized too, please bear with me.
(Updates may occur on the game itself while I work on it.)There's two things you'll want to think about implementing in your applet - active rendering and double buffering as you mentioned.
Active rendering consists of drawing to the screen in the same thread that runs the game applet. By default, when you call repaint(), the AWT Event thread handles the repainting and gets around to repainting the screen whenever it feels like doing so - sometimes not at all! (well, that's not entirely true, but you get the idea)
Double buffering entails writing to an offscreen buffer, and then drawing that buffer to the screen.
Thankfully, both are relatively easy to implement.
Active rendering is the easier of the two to implement. In your game loop, where you call repaint(), don't! Instead, call paint() directly and use the applets getGraphics() method, which will return a Graphics or Graphics2D object for you to use. So instead of having repaint(), replace it with paint(getGraphics());
Double buffering is a bit more complicated to implement. I'd suggest trying this after you've tried active rendering. Double buffering includes have an Image field in your applet class. I often call it 'buffer', but there's quite a few other common names you'll come across for it.
To initialize the image, call the applet's createImage(width, height) method. This will return an Image object. You can get a Graphics object that corresponds to that image by calling its getGraphics() method just like you do with active rendering. You no longer want to have all of the painting being done in the paint() method of your applet. Instead, a new method is in order to handle the painting of the game screen to the buffer. Your paint method then should simply call g.drawImage(...) and draw the backbuffer to the screen.
A small example:
public class doubleBufferApplet implements Applet
Image buffer;
. . . //Other fields
public void init()
buffer = createImage(getWidth(), getHeight()); //returns an Image object the size of the applet and assigns it to buffer
. . . //Do other initializing
public void run()
while(gameIsStillRunning) //Main game loop
. . . //Run through and update the game
if(buffer != null)
drawGame(buffer.getGraphics()) //Draw the game to the backbuffer
paint(getGraphics()); //Draw the backbuffer to the screen
public void drawGame(Graphics g)
. . . //Do your painting here
public void paint(Graphics g)
if(buffer != null)
g.drawImage(buffer, 0, 0, this);
public void update(Graphics g) //Override the default update() method to avoid Java from calling it randomly
paint(g);
I hope that gave you a decent idea of how to go about implementaing active rendering and a buffer. If not, I'll try harder to answer any questions you have (or some of the more experienced users around here will help you out as well I'm sure). -
Hi, i was wondering if anyone had made a edge animate platformer game already.
like Mario and Sonic are platformer 2d games.
i'm kinda stuck on the collision part of it.
there almost none DOM ( div) based games source codes available, almost all html5 games are canvas based.
there is a collision jquery plugin available but that one mainly registers if it hits a corner, like the northwest corner, and that is both top and left side. so that isn't usefull when needing only one side.
so i was wondering if someone could help me out here.Hi, i was wondering if anyone had made a edge animate platformer game already.
like Mario and Sonic are platformer 2d games.
i'm kinda stuck on the collision part of it.
there almost none DOM ( div) based games source codes available, almost all html5 games are canvas based.
there is a collision jquery plugin available but that one mainly registers if it hits a corner, like the northwest corner, and that is both top and left side. so that isn't usefull when needing only one side.
so i was wondering if someone could help me out here. -
i'm looking for similar 2D platform games app similar to Super Mario Bros. for NDS or maybe Prince of persia...free or otherwise. thanks.
onslaught,
I really like bounce on it feels a lot like Super Mario Bros. To me. You can try out the lite version for free. http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=303583418&mt=8 The final version though is $ 3.99 found here: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=300438180&mt=8
Also if you looking for a great shooter/vampire game I would look into iDracula its only $0.99 and it for me it provides endless fun.The demo is here: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=309062653&mt=8 and the full version is here: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=305196662&mt=8
Hope that helps,
Weston -
Where to start with a simple platform game?
What resources should I look at to learn how to create a very simple platform game, with a charactor who can simply jump on platforms and avoid enemies to reach the end of the level?
I have made games like this with other languages but never flash.
Thanks.I am also interested in this answer but in my case from the aspect of Silverlight-only developer with no flash experience (I know that sucks
Thanks,
Nikola -
I want to make a platformer game like super mario. But I want
my game to have hills in it.
There is a very famous flash game called Fancy Pants
Adventure 2. It is a platformer with hills in it.
I want to know how to do that. I can make a platformer game
using hitTest(); but that only works with boundary boxes and not
diagonal and curved objects (like hills). I have looked all over
the internet to find out how to do this but I can not find my
answer. If you know how to do this then you are absolutely amazing
in my eyes and could you please explain to me how to do it.
Thank youSo there is no way for flash to see if two objects collide
without boundary boxes with actionscript. Motion guides would take
forever if they are what I think they are. -
How do I fix the FPS in my platform game?
Hi everyone! As part of a course in Gamemaking in school, my team created a platformer with a colission-map instead of tiles. This has worked out well for the most part.
My problem is that we have a loop that updates and draws everything to the screen ( this is in windowed mode by the way ) . The game runs and the gameplay is ok.
But it runs with different speed depending on the hardware. On my computer everything is slow, but on new computers the objects race back and forth like mad. Furthermore sometimes as the player dies and the level restarts, the player dies on the spot!
From what I have read this is due to the fact that we haven´t fixed the FPS. But Im at a loss as to how im supposed to fix it. One sollution tells me to use a timer and then place logic inside actionPerforemed, but since I am using a loop inside run() this cant work.
The program is divided into several classes, but the main logic residen in the class main,java
public Main(){
super("Mimic");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
this.enableEvents(KeyEvent.KEY_PRESSED | MouseEvent.MOUSE_DRAGGED);
setSize(1280, 720);
setResizable(false);
setLocationRelativeTo(null);
requestFocusInWindow();
AudioPlayer.loadClip("transform", "sound/transform2.wav");
AudioPlayer.loadClip("gameover", "sound/gameover.wav");
AudioPlayer.loadClip("ambient", "sound/test.wav");
AudioPlayer.loadClip("jump", "sound/jump.wav");
//Cursor - 1x1px
Toolkit toolkit = Toolkit.getDefaultToolkit();
Image transparent = toolkit.getImage("images/empty_pixel.gif");
Point hotSpot = new Point(0,0);
Cursor game = toolkit.createCustomCursor(transparent, hotSpot, "transparent");
setCursor(game);
createBufferStrategy(3);
transformationTimer = new Timer(1000, this);
transformationTimer.setInitialDelay(0);
geyserTimer = new javax.swing.Timer(1000, new ClockListenerGeyser());
geyserTimer.start();
mimicTimerBarBackground = new ImageIcon("images/mimic-bar-bgr.png").getImage();
mimicTimerBar = new ImageIcon("images/mimic-bar.png").getImage();
start();
}//public
public void start(){
(new Thread(this)).start();
}//start
public void run(){
avatar = new Avatar();
//Ambient sound
//AudioPlayer.play("ambient", true); Musiken avstängd...
loadLevel(Map.Levelname.LevelOne);
//loadLevel(Map.Levelname.LevelTwo);
long start = System.nanoTime();
long delta = 0;
long sleep;
while(gameOn){ // game loop
tick(delta);
draw();
delta = System.nanoTime() - start;
sleep = DELAY - delta;
// detta är en test för att kolla om loopen fortfarande har tid kvar att göra saker, om den har det, sov och ge den en//
start = System.nanoTime();
//tick(delta);
//draw();
}//while
System.exit(0);
}//run
//i den här metoden ligger allt motor, kollision, styrning och scrollning m.m
public void tick(long tid) {
float timeScale = tid/100000000f;
avatar.update(tid); //animationen uppdateras
currentMap.tick(tid);
// update mimics
// lots of codes for Keys, colissionmap and more here.
public void draw(){
Graphics g = getBufferStrategy().getDrawGraphics();
g.translate(-cameraX,-cameraY);
g.drawImage(currentMap.collisionMap, 0, 0, null);
for(Background b: currentMap.getBackgrounds()){
if(b.isVisible())
g.drawImage(b.getImage(),(int)b.getX(), (int)b.getY(), null);
}//for
for(MapItems mi: currentMap.getItemList()){
g.drawImage(mi.getImage(),(int)mi.getX(), (int)mi.getY(), null);
}//for
for(Mimics m: currentMap.getList()){
if(m.getVisas()){
g.drawImage(m.getImage(), (int)m.getX(), (int)m.getY(), null);
}//if
}//for
g.drawImage(avatar.getImage(), (int)avatar.getX(), (int)avatar.getY(), null);
if (currentMap.levelname == Map.Levelname.LevelTwo){
g.drawImage(grass, 0, 623, null);
g.drawImage(key, cameraX+1000, cameraY+72, null);
g.drawImage(sekLevel, 800, 580, null);
//Visar timern om den är aktiv
if (transformationTimer.isRunning()) {
g.drawImage(mimicTimerBarBackground, cameraX+509, cameraY+72, null);
g.drawImage(mimicTimerBar, cameraX+514, cameraY+77, (int)(cameraX+514+(200/20)*transformationTime), cameraY+77+30, 0, 0, (int)(200/20)*transformationTime, 30, null);
g.setColor(Color.red);
g.dispose();
getBufferStrategy().show();
}//void
I figure I got to put a timer to fix the FPS somewhere in here, but where?
Any help is greatly appreciated!
Regard,
GabrielSpeed should be 'tick' based. The way I do it, with silky smooth results, is to lock the game to a framerate. That part is quite easy, all you do is calculate at what interval you want to update. Say you want 60FPS, it becomes:
interval = 1000 / 60 (interval = 17ms).
So if you want 60FPS, you have to update and draw every 17 milliseconds. That sounds like a short time, but for computers it really is not.
Okay, so you have your game loop. while(true) { update(); render(); }. The body of this loop should execute every 17ms (it won't be that precise, but it will be good enough). It goes a little something like this:
while(running){
long measure1 = currentTimeInMillis();
update();
render();
long measure2 = currentTimeInMillis();
long diff = measure2 - measure1;
Thread.sleep(17-diff); // sleep until next tick
}This will have the game ticking at 58-61 FPS, depending on the timing precision of the OS - you'll find that on Linux OSes the framerate is far more steady than on Windows environments for example, in Java at least. Its just the sleep call that is far from precise.
Now you will want to make movement based on the framerate - the way I do that is to work with float measurements. For movement speed I say 'every tick, move X.X pixels', where I keep the units in increments of 0.5 pixels. This means that moving game entities can go as slow as 0.5 pixels each tick in my games, which is slow enough for most of them. In the end when determining the actual pixel locations, the floats are rounded down to ints.
I hope that makes some sense. -
I can't solve this for days already... When the hero object dies, the floorObject do not remove completely, such that one of them remains. And the hero object
disappears. Thanks for all the help.
package
import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.events.*;
import flash.utils.getTimer;
public class Platform extends MovieClip
// movement constants
static const gravity:Number = .004;
// screen constants
static const edgeDistance:Number = 100;
// object arrays
private var fixedObjects:Array;
private var otherObjects:Array;
// hero and enemies
private var hero:Object;
private var enemies:Array;
// game state
private var playerObjects:Array;
private var gameScore:int;
private var gameMode:String = "start";
private var playerLives:int;
private var lastTime:Number = 0;
private var currentX:int = 0;
public function startPlatformGame()
// constructor code
gameMode = "play";
public function startGameLevel()
createHero();
addEnemies();
// examine level and note all objects
examineLevel();
// add listeners
this.addEventListener(Event.ENTER_FRAME,gameLoop);
stage.addEventListener(KeyboardEvent.KEY_DOWN,keyDownFunction);
stage.addEventListener(KeyboardEvent.KEY_UP,keyUpFunction);
// set game state
gameMode = "play";
public function createHero()
hero = new Object();
hero.mc = gamelevel.hero;
hero.dx = 0.0;
hero.dy = 0.0;
hero.inAir = false;
hero.direction = 1;
hero.animstate = "stand";
hero.walkAnimation = new Array(2,3,4,5,6,7,8);
hero.animstep = 0;
hero.jump = false;
hero.moveLeft = false;
hero.moveRight = true;
hero.jumpSpeed = .8;
hero.walkSpeed = .15;
hero.width = 30.0;
hero.height = 40.0;
hero.startx = hero.mc.x;
hero.starty = hero.mc.y;
public function addEnemies() {
enemies = new Array();
var i:int = 1;
while (true) {
if (gamelevel["enemy"+i] == null) break;
var enemy = new Object();
enemy.mc = gamelevel["enemy"+i];
enemy.dx = 0.0;
enemy.dy = 0.0;
enemy.inAir = false;
enemy.direction = 1;
enemy.animstate = "stand"
enemy.walkAnimation = new Array(2,3,4,5);
enemy.animstep = 0;
enemy.jump = false;
enemy.moveRight = true;
enemy.moveLeft = false;
enemy.jumpSpeed = 1.0;
enemy.walkSpeed = .08;
enemy.width = 30.0;
enemy.height = 30.0;
enemies.push(enemy);
i++;
public function examineLevel()
fixedObjects = new Array();
otherObjects = new Array();
for (var i:int=0; i<this.gamelevel.numChildren; i++)
var mc = this.gamelevel.getChildAt(i);
// add floors and walls to fixedObjects
if (mc is Floor)
var floorObject:Object = new Object();
floorObject.mc = mc;
floorObject.leftside = mc.x;
floorObject.rightside = mc.x + mc.width;
floorObject.topside = mc.y;
floorObject.bottomside = mc.y + mc.height;
fixedObjects.push(floorObject);
else if ((mc is Treasure) )
otherObjects.push(mc);
fixedObjects.sortOn("leftside" , Array.NUMERIC );
for each (floorObject in fixedObjects)
trace(floorObject.leftside);
// add treasure, key and door to otherOjects;
public function keyDownFunction(event:KeyboardEvent)
if (gameMode != "play")
return;
}// don't move until in play mode
if (event.keyCode == 37)
hero.moveLeft = true;
else if (event.keyCode == 39)
hero.moveRight = true;
else if (event.keyCode == 32)
if (! hero.inAir)
hero.jump = true;
public function keyUpFunction(event:KeyboardEvent)
if (event.keyCode == 37)
hero.moveLeft = false;
else if (event.keyCode == 39)
hero.moveRight = false;
public function gameLoop(event:Event)
// get time differentce
if (lastTime == 0)
lastTime = getTimer();
var timeDiff:int = getTimer() - lastTime;
lastTime += timeDiff;
// only perform tasks if in play mode
if (gameMode == "play")
moveCharacter(hero,timeDiff);
checkCollisions();
scrollWithHero();
death();
public function moveCharacter(char:Object,timeDiff:Number)
if (timeDiff < 1)
return;
// assume character pulled down by gravity
var verticalChange:Number = char.dy * timeDiff + timeDiff * gravity;
if (verticalChange > 15.0)
verticalChange = 15.0;
char.dy += timeDiff * gravity;
// react to changes from key presses
var horizontalChange = 0;
var newAnimState:String = "stand";
var newDirection:int = char.direction;
if (char.moveLeft)
// walk left
horizontalChange = - char.walkSpeed * timeDiff;
newAnimState = "walk";
newDirection = -1;
else if (char.moveRight)
// walk right
horizontalChange = char.walkSpeed * timeDiff;
newAnimState = "walk";
newDirection = 1;
if (char.jump)
// start jump
char.jump = false;
char.dy = - char.jumpSpeed;
verticalChange = - char.jumpSpeed;
newAnimState = "jump";
// assume no wall hit, and hanging in air
char.hitWallRight = false;
char.hitWallLeft = false;
char.inAir = true;
// find new vertical position
var newY:Number = char.mc.y + verticalChange;
// loop through all fixed objects to see if character has landed
for (var i:int=0; i<fixedObjects.length; i++)
if ((char.mc.x+char.width/2 > fixedObjects[i].leftside) && (char.mc.x-char.width/2 < fixedObjects[i].rightside))
if ((char.mc.y <= fixedObjects[i].topside) && (newY > fixedObjects[i].topside))
newY = fixedObjects[i].topside;
char.dy = 0;
char.inAir = false;
break;
// find new horizontal position
var newX:Number = char.mc.x + horizontalChange;
// loop through all objects to see if character has bumped into a wall
for (i=0; i<fixedObjects.length; i++)
if ((newY > fixedObjects[i].topside) && (newY-char.height < fixedObjects[i].bottomside))
if ((char.mc.x-char.width/2 >= fixedObjects[i].rightside) && (newX-char.width/2 <= fixedObjects[i].rightside))
newX = fixedObjects[i].rightside + char.width / 2;
char.hitWallLeft = true;
break;
if ((char.mc.x+char.width/2 <= fixedObjects[i].leftside) && (newX+char.width/2 >= fixedObjects[i].leftside))
newX = fixedObjects[i].leftside - char.width / 2;
char.hitWallRight = true;
break;
// set position of character
char.mc.x = newX;
char.mc.y = newY;
// set animation state
if (char.inAir)
newAnimState = "jump";
char.animstate = newAnimState;
// move along walk cycle
if (char.animstate == "walk")
char.animstep += timeDiff / 60;
if (char.animstep > char.walkAnimation.length)
char.animstep = 0;
char.mc.gotoAndStop(char.walkAnimation[Math.floor(char.animstep)]);
// not walking, show stand or jump state
else
char.mc.gotoAndStop(char.animstate);
// changed directions
if (newDirection != char.direction)
char.direction = newDirection;
char.mc.scaleX = char.direction;
public function checkCollisions()
for (var i = otherObjects.length-1; i >= 0; i--)
if (hero.mc.hitTestObject(otherObjects[i]))
getObject(i);
for (var j:int = enemies.length-1; j>=0; j--)
if (hero.mc.hitTestObject(enemies[j].mc))
currentX = hero.mc.x;
gameComplete();
public function scrollWithHero()
var stagePosition:Number = gamelevel.x + hero.mc.x;
var rightEdge:Number = stage.stageWidth - edgeDistance;
var leftEdge:Number = edgeDistance;
if (stagePosition > rightEdge)
gamelevel.x -= (stagePosition-rightEdge);
if (gamelevel.x < -(gamelevel.width-stage.stageWidth))
gamelevel.x = -(gamelevel.width-stage.stageWidth);
if (stagePosition < leftEdge)
gamelevel.x += (leftEdge-stagePosition);
if (gamelevel.x > 0)
gamelevel.x = 0;
public function getObject(objectNum:int)
if (otherObjects[objectNum] is Treasure)
gamelevel.removeChild(otherObjects[objectNum]);
otherObjects.splice(objectNum,1);
public function death()
if (hero.mc.y > 300)
currentX = gamelevel.hero.x;
trace(currentX);
gameComplete();
public function gameComplete()
gameMode = "dead";
var dialog:Dialog = new Dialog();
dialog.x = 175;
dialog.y = 100;
addChild(dialog);
dialog.message.text = "Gameover";
public function clickDialogButton(event:MouseEvent)
removeChild(MovieClip(event.currentTarget.parent));
// new life, restart, or go to next level
if (gameMode == "dead")
// reset hero
hero.mc.x = currentX;
hero.mc.y = 0;
trace("dead");
setReplay();
gameMode = "play";
// give stage back the keyboard focus
stage.focus = stage;
public function setReplay()
for (var i:int = fixedObjects.length-1; i>-1; i--)
if (fixedObjects[i].leftside < currentX)
this.gamelevel.removeChildAt(fixedObjects[i]);
fixedObjects.splice(i,1);
trace("Splice?");
for each (var floorObject in fixedObjects){
trace(floorObject.leftside);
public function cleanUp()
removeChild(gamelevel);
this.removeEventListener(Event.ENTER_FRAME,gameLoop);
stage.removeEventListener(KeyboardEvent.KEY_DOWN,keyDownFunction);
stage.removeEventListener(KeyboardEvent.KEY_UP,keyUpFunction);Ok, I fiured it all out, the other way you mentioned. Just opened up the character MC, and named 2 frames. One LEFT and one RIGHT. Then I added a few simple lines of code, and turned out with this:
if (Key.isDown(Key.RIGHT)) {
_x += speed;
this.gotoAndStop("right");
if (Key.isDown(Key.LEFT)) {
_x -= speed;
this.gotoAndStop("left");
Thanks for helping!!!
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