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As3 Collision help needed

New Here ,
Mar 18, 2021 Mar 18, 2021

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Hello I am wondering is there a proper way to implement player collision with objects.

I have tried figuring this out for over a week now. I probably should have asked on here earlier.

I would rather not have to install a lib to do this if possible.

If a lib is neccissary please link me to some documentation on how to use it.

I tried nape with no luck. I am trying to make it so when I collide with an object it stops the player from moving further without skipping them back a few steps to reset them allowing them to move back away from the collision without being stuck to the collider.

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correct answers 1 Correct answer

Community Expert , Mar 21, 2021 Mar 21, 2021

you can use removeEventListener to remove an event listener, but if you're re-adding event listeners because a frame is playing it's better to use:

 

var alreadyExecuted;

if(!alreadyExecuted){

// any code you don't want re-executed. eg,

whatever.addEventListener(someevent,somefunction);

alreadyExecuted = true;

}

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Community Expert ,
Mar 19, 2021 Mar 19, 2021

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canvas or as3?

 

what problem are your having?

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New Here ,
Mar 19, 2021 Mar 19, 2021

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Thank you for your reply. 

 

In my player script I check if the player is colliding here

if (varLeft == true){
				if(_collision){
					char.x += speed;
				_collision = false;

				return;
				}
				char.x -= speed;				
			}

Im simply resetting the char.x back a step if it collides with a collision object because if I dont set it back a step _collision will still be true.

I want to make it so the char will not need to be reset back a step but allow them to move away still without _collision equaling true. I hope Im making sense.

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Community Expert ,
Mar 19, 2021 Mar 19, 2021

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if you're trying to make the char reverse direction upon collision, use:

 

if (varLeft == true){
if(_collision){

speed *= -1;
_collision = false;

}
char.x += speed;

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New Here ,
Mar 19, 2021 Mar 19, 2021

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no Im trying to just make the character stop on collision and not stop them from moving completely after collision.

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New Here ,
Mar 19, 2021 Mar 19, 2021

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For instance. say a car crashes into a wall. obviously the car would stop from the collision.

But my problem is that once I crash into the wall I cant back away from the wall. Im stuck on the collision.

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Community Expert ,
Mar 19, 2021 Mar 19, 2021

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usually after a collision the one or both objects are distroyed or move away (eg, rebound) from each other.  otherwise, you're going to have a problem.

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New Here ,
Mar 20, 2021 Mar 20, 2021

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could you provide me with a proper collision example the way you think it should be done.

So essentially weather the player is moved back a step or whatever, however it should be done.

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New Here ,
Mar 20, 2021 Mar 20, 2021

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for example I currently have

if(varRight == true){				
				char.x += step;
			}			
			if(varLeft == true){				
				char.x -= step;		
			}
			if(varUp == true){
				char.y -= step;
			}
			if(varDown == true){
				char.y += step;
			}
			if (char.collisionArea.hitTestObject(Main.world.collision)){	
				_collision = true;				
			}

for player movement. how would I make it so if _collision = true it stops or kicks the player back to their previous position.

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Community Expert ,
Mar 21, 2021 Mar 21, 2021

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var prevX = char.x;
var prevY = char.y;

if(!_collision) {
if(varRight) {
rightF()
}
if(varLeft) {
leftF();
}
if(varUp) {
upF();
}
if(varDown) {
downF()
}
} else {
if(varRight && prevMove!="right") {
rightF()
}
if(varLeft && prevMove!= "left") {
leftF();
}
if(varUp && prevMove!="up") {
upF();
}
if(varDown && prevMove!="down") {
downF()
}
}
// you may want a min distance before resetting this
_collision = false;
}
if(char.collisionArea.hitTestObject(Main.world.collision)) {
_collision = true;
char.x = prevX;
char.y = prevY;
}


function rightF(){
char.x += step;
prevMove = "right";
}
function leftF(){
char.x -= step;
prevMove = "left";
}
function upF(){
char.y -= step;
prevMove = "up";
}
function downF(){
char.y += step;
prevMove = "down";
}

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New Here ,
Mar 21, 2021 Mar 21, 2021

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Thank you soo much, it works perfect.

Just one last question. how would i remove the event listener for movement because it is stacking the movement speed every time I start the application for some reason.

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Community Expert ,
Mar 21, 2021 Mar 21, 2021

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LATEST

you can use removeEventListener to remove an event listener, but if you're re-adding event listeners because a frame is playing it's better to use:

 

var alreadyExecuted;

if(!alreadyExecuted){

// any code you don't want re-executed. eg,

whatever.addEventListener(someevent,somefunction);

alreadyExecuted = true;

}

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