I’m trying to get the whole set of x, y coordinates that are stored in an array. ArrayList<Points> recorded = new ArrayList(); void store (float x, float y) { int ArrayListSize = recorded.size()-1; if (ArrayListSize>=0) { PVector p1 = recorded.get(ArrayListSize).p1; if (p1.x…

[image] papaboo: Why does it give an error when I add .x or .y after get(i) ? Are you running those line in your code you posted above? With ArrayList<Points> recorded ? Then here recorded.get(i).x you forgot p1 (which is located in the class Points), no? recorded.get(i).p1.x because …

Hi @papaboo , My suggestion would be to simplify things :slight_smile: So the PVector stores already x and y, so you don’t need a new class [image] PVector \ Language (API) \ Processing 3+ Find my example below. Everytime you click on the canvas, the mouse coor…

Thanks @MiguelSanches but I still don’t understand why a statement like this doesn’t work for my code : if (recorded.size() == 100) { for (int i = 0; i < 100; i++) { println("X = " + recorded.get(i).x + ", Y = " + recorded.get(i).y); } } Why does it give an error when…

another version ArrayList<PVector> recorded = new ArrayList(); void setup() { size(1110, 400); background(0); } void draw() { background(0); for (PVector pv : recorded) // short form of for-loop ellipse(pv.x, pv.y, 7, 7); } void mousePressed() { //Add new coordinates to Array…

Thanks @Chrisir , I’ve got another question related to this. To animate an object (a red circle in this particular example) along the points drawn; I’m using the code below in draw() but the red circle ends up at the end of the path (at the last vertex in the array). I thought for loop in Processing…

Explanation draw() updates the screen only one time at its end. Therefore you cannot see any animation done with a for loop. Get rid of the for loop and then use the fact that draw is looping in itself. So make i a global variable and increase it with i++; When i is >= size() of the list say i …

Printing all PVector coordinates stored in an ArrayList

Processing Beginners

GoToLoop November 17, 2020, 5:05pm 6

papaboo:

Just returns the index numbers like sketch$Points@39a69ce2

Print class variables Beginners

A class needs to @Override the toString() method, so it can return a String w/ the current value of its fields. Here’s a link w/ an example for it: Forum.Processing.org/two/discussion/25986/how-can-i-replace-pvector-tostring#Item_7

Other examples w/ toString():

How to reference an object in another function to its class? Beginners

1 way to do it: Person squid; void setup() { frameRate(1); squid = new Person(); } void draw() { squid.increaseAge(); // alt.: ++squid.age; print(squid); } class Person { int age; Person increaseAge() { ++age; return this; } String toString() { return "Age: " + age + TAB; } }

Objects in objects Beginners

In general an object shouldn’t need to be aware of any other object which “owns” it. But if you feel you need such feature you can create an “owner” field for it: /** * AppleTree (v1.0.0) * GoToLoop (2020/Jul/08) * https://Discourse.Processing.org/t/objects-in-objects/22486/2 */ import java.util.List; Tree tree; void setup() { tree = new Tree().bearFruit().bearFruit(); println(tree); println(tree.apples); exit(); } class Apple { Tree owner; Apple() { } Apple(final Tr…

Accessing functions from Java Generics Coding Questions

Even If we had 2 or more classes w/ the exactly same code, Java would still “see” them as different from each: void setup() { MyVec vec1 = new MyVec(); MyVecTwin vec2 = new MyVecTwin(); println(MyVec.class.isInstance(vec1)); // true println(MyVec.class.isInstance(vec2)); // false exit(); } class MyVec { float x = random(-100, 100), y = random(-100, 100), z; @Override String toString() { return "[ " + x + ", " + y + ", " + z + " ]"; } } class MyVecTwin { // exactly same…

Parent function not using overwritten array from child Beginners

You’re not overriding but overshadowing the parent’s class field named array inside each of its child classes! Overriding is for non-static methods only. Other types of class members become overshadowed instead. So when subclassing take extra care not to accidentally re-declare inherited fields and static methods. If you need so instead assign a value w/o re-declaring them. // https://Discourse.Processing.org/t/ // parent-function-not-using-overwritten-array-from-child/22796/3 // GoToLoop …

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Printing all PVector coordinates stored in an ArrayList

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