Making Objects Ricochet

Use nagative sign should work from start point

I tried that and it works, but it has some glitches...I was looking for an example of how someone has done it in the past. There has to be a better way than just using the negative.

I can't imagine this is a first, so someone has to have coded this behavior before. I just need to find where that is...

I am not sure you will find other magic except using Math calculation. All games using 60% basic mathematical formulas such as Math.abs/cos/cin, mod, negative etc.  I am fine to wait if someone will give you other solutions

Hi Dgofman, I understand what you're saying...I was hoping someone had already figured it out and perhaps there was some sort of function already in place that I could use.

That said, I've been thinking about it and this is what I'm going to try to do...but first, lets analyse the problem.

The problem is not making an object ricochet at 180 degrees from its original path when it collides with another object. The problem is making multiple objects ricochet all at once in different directions. The issue here is that you have to keep track of all the slopes individually!

Lets assume for our example that we have 10 instances of the redBall on the stage, all moving around in different directions and all hitting the edges of the stage and bouncing off of that edges back into the stage. I can do that much thus far.

In this example I had to assign multiple instances of the "x" and the "y" property for each instance, hence "individual slopes." In other words, the "x" value for redBall1 is not the same as the "x" value for redball2.  

So, based on that, you have an instance with its individual "x" and "y" properties, and now that instance is going to collide with another instance of the RedBall Class, that also has individual values for its "x" and "y" properties.

I've been thinking of designing a Class that has the instance name, the "x" and the "y" parameters built into that Class. So, when my two objects collide, I can simply say:

instance1.x1 = - instance1.x1;
instance1.y1 = - instance1.y1;

and

instance2.x2 = - instance2.x2;
instance2.y2 = - instance2.y2;

In this way, I can set my two instances in completely opposite paths, with more specificity and they will be easier for address in the code.

Any thoughts...?

Fulano

Yes you can, but please check my sample how you can do without class declaration
ball.fla

Hi Dgofman, I've been trying to understand what you did and how your code works in terms of a collision and a bounce back, but am having a bit for trouble seeing your logic.

Can you step through your code in the ball.fla file and explain your logic?

Thanks,
Fulano

Surprise, you cannot understand so simple logic.


var step:Number;
var pos:Number = 0;
var offset:Number = redBall1.width;

var x_ball1:Number = 0;
var x_ball2:Number = stage.stageWidth - offset;

function moveBall(){
      if(pos >= stage.stageWidth - offset){
            step = -5;
            pos = stage.stageWidth - offset;
      }else if(pos <= 0){
            step = 5;
            pos = 0;
      }
      pos += step;
      
      redBall1.x = x_ball1 + pos;
      redBall2.x = x_ball2 + -pos;
}

setInterval(moveBall, 10);

We have two balls one starts from 0 another from  stage.width
Now I’m incrementing position by positive 5 pixels and I when position reached stage.width I changing to negative 5 pixels

So, now with time interval 10 milliseconds I changing x coordinate for two balls

redBall1.x = x_ball1 + pos;
redBall2.x = x_ball2 + -pos;

That it it’s so simple

OK...now I see what you're doing. However, keep in mind I'm a beginner at this, so simple to you may not always be simple to me...

That said, I understand why I couldn't understand what you were trying to do (of that makes sense). You're not actually coding for a collision, you're actually predetermining their path, their intersection and their bounce back direction...that's why I couldn't figure out how the heck you had identified a collision.

This is not what I'm trying to figure out...

First, I instantiate the instances of the balls in my code. You actually placed them on the stage. Also, I will never know where the two balls are going to collide, because I am not predetermining a path.

This is not identifying and reacting to a collision, this a pre programmed path.

Sure its easy, but it does not address my original question, whcih was:

    "I can identify when they collide using the "object1.hitTestObject(object2)" command, but how would I make them each go in opposite directions?"

Any thoughts about that...?

This tutorial is very good for ActionScript 2.

I'm doing AS3, which from what I understand is completely different code. How does that affect the tutorials?

Also, specifically which one of these videos address my question regarding collisions and bounce back? There are a lot of videos here and if you think I should watch them to answer my question, which video made you think that?

Is not big problem migration to AS3 if you know concept how collision working in AS2.
Watch all videos is teaching how to write code by step to step.

Dgofman, I appreciate you sharing the link with me and yes, it will help in general edification of how to write code. However, that still does not answer my specific question.

I am asking for help with how to make objects ricochet away from each other when they collide. I know that I can learn from watching all the videos, but that is not what I'm asking about and not the solution the question deserves.

If you do not know how its done, then that's fine. I'm OK with that, but don't drag this question out providing me answers that are not specific.

I don't have a problem awarding points to those that try to help, but I don't consider suggesting that I watch 2 dozen videos or more, help with a specific question.

Just to be clear...there are nearly 90 videos on this site. Again, a good opportunity for learning, but it is not specific to my question, unless you can suggest one or two specific videos that address my question - specifically.

Dgofman, I'm just going to close this question out...I'll award you the points to save myself the time.

Not a specific solution and had to dig through the answer far too much.