How to generate random position object - processing

Question

I'm trying to generate 15 circles on a 1500 - 1000 space, every cirlce with a diferent position. I know how to generate 1 random circle but that's all. How should I do it?

Answer 1

It sounds like you're looking for a for loop:
for(int i = 0; i < 15; i++){
// draw a random circle here
}
Shameless self-promotion: here is a tutorial on for loops in Processing.

Answer 2

Basically, you need to create a Circle class and ArrayList which contains all your circles.
Then using a for you add in that list 15 circles passing to constructor random coordinates and a fixed width and height you decide.
class Circle {
float x, y, size;
public Circle(float x, float y, float size) {
this.x = x;
this.y = y;
this.size = size;
}
public void update() {
ellipse(x, y, size, size);
}
}
Declare globally your ArrayList. Now, in setup() you instantiate your ArrayList and populate it with randomly generated coordinates
ArrayList<Circle> circlesList; // This needs to be declared globally
float circleSize = 64; // Circles size in pixels
void setup() {
size(1500, 1000);
circlesList = new ArrayList<Circle>();
// Populating the ArrayList with circles
for (int i = 0; i < 15; i++) {
float randomx = random(0, 1500); // Random generated X
float randomy = random(0, 1000); // Random generated Y
Circle newCircle = new Circle(randomx, randomy, circleSize);
circlesList.add(newCircle);
}
}
Now in draw() function, using a foreach loop, you'll draw every single circle inside that ArrayList
void draw() {
background(255); // Background color
fill(255, 0, 0); // Circle fill color
for (Circle c : circlesList) {
c.update();
}
}
Please note that this way your circles may overlap or be a little bit outside of the screen. Ask anything if the code is unclear, don't just copy-paste it.
Hope this helped :)