Hello, I am trying to fully understand the Java BouncyBubbles example. Here’s the code: int numBalls = 12; float spring = 0.05; float gravity = 0.03; float friction = -0.9; Ball[] balls = new Ball[numBalls]; void setup() { size(640, 360); for (int i = 0; i < numBalls; i++) { balls[i] = n…

[image] amundsen: Then, this for routine is strange: for (Ball ball : balls) . Why neither semicolons nor comparison but a colon? // balls is a list of objects of class Ball // for (Ball ball : balls) // means loop through all objects in list balls and give me each as : // ball of class Ball …

Got it! What about the other question?

i also just read it and, what can i say: you and me need another year of hard work before we would be able to come up with that kind of idea / structured coding, so let us forget how that is be done by the “genius” and start at the beginning: WHY? a class is a powerful thing what has grown over…

Things became a bit less complex when I understood that ball was just the name of an iterator such as i in usual for loops and it has nothing to do with balls apart from the purpose of the sketch. The loop could has been coded like this: for (Ball dadido : balls) { dadido.collide(); dadi…

yes, that’s why you write for ( int i right, a loop local variable but regarding your: [image] amundsen: fully understand sorry: homework? try int numBalls = 3; //.. and after float minDist = others[i].diameter/2 + diameter/2; println("i:"+i+" id: "+id+" minDist: "+minDist); …

[image] kll: But if you now not want do that check loop from the outside, you might try to do that inside, as a method of the class, what is impossible unless the class has a link to the others. ( and by the way, that is insofar a easy example as it refs to “its” array of this class, it migh…

no, not NEED, just WANT to use the data of a “external” array funny that it is a array of its own class type again, a class Ball does not know if/that you made a object ball or a array balls of its or any kind.

[image] kll: no, not NEED, just WANT to use the data of a “external” array funny that it is a array of its own class type again, a class Ball does not know if/that you made a object ball or a array balls of its or any kind. Does it mean that the class Ball and the object Ball are not the s…

[image] kll: sorry: homework? try int numBalls = 3; //.. and after float minDist = others[i].diameter/2 + diameter/2; println("i:"+i+" id: "+id+" minDist: "+minDist); is that looping clear? Yes, it’s a way to avoid checking twice if a collision occurs between the two same balls…

Questions about BouncyBubbles example

Processing Coding Questions

jb4x November 24, 2018, 5:37pm 3

You can have a look here, we were speaking about it: Help a newbie with polymorphic particles

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