Change color of ellipse when intersects

[Jack Adee]

In the end I want my result to be 20 circles and if a red circle touches a yellow circle the yellow circle will turn red. Here is a scaled down version with only two. It should work but it doesn't seem too.

class Dot {

  constructor(x, y, color, speed) {

    this.x = x

    this.y = y

    this.color = color

    this.speed = speed

  }}

let x = 320;

let y = 180;

let xspeed = 5;

let yspeed = 2;

let speeds = [[5, 2], [2, 5]]

let array = [[320, 180], [450, 120]]

let colors = [[255, 0, 0], [0, 255, 255]]

let r = 10;

let dots = [new Dot(320, 180, [255, 0, 0], [5, 2]), new Dot(450, 120, [255, 255, 0], [2, 5])]

function setup() {

  createCanvas(640, 360);

}

function draw() {

  background(255);

  

  for (let i = 0; i <= 1; i++) {

    let c = color(dots[i].color[0], dots[i].color[1], dots[i].color[2]);

  noStroke();

  fill(c);

  let x = dots[i].x

  let y = dots[i].y

  ellipse(x, y, r*2, r*2);

  x += dots[i].speed[0];

  y += dots[i].speed[1];

  

  if (x > width - r || x < r) {

    dots[i].speed[0] = -dots[i].speed[0];

  }

  if (y > height - r || y < r) {

    dots[i].speed[1] = -dots[i].speed[1];

  }

  dots[i].x = x

  dots[i].y = y

  intersect(i)

  }

}

function intersect(i) {

   for (let x = 0; x < dots.length; x++) {

    if (i!==x); {

      if (x.color === [255, 0, 0]); {

        var d = dist(x.x, x.y, i.x, i.y);

        if (d < r + r) {

          i.color = [255, 0, 0]

        } else {

          return false;

        }  

    }}

  }

}

[Lee Brunjes]

So looking at your code, In draw you draw the ellipse and then pick the color using intersect.

function draw() {

  ...

  ellipse(x, y, r*2, r*2);

  ...

  intersect(i)

  }

}

Additionally, the intersect function is currently taking an int i and trying to set the color of it. and do math against it

 I would do it in a pair of nested loops, Move the intersects function into the dot class so you can be like:

for all the dots in yellow

  for all the dots in red

     if(yellow_dot.intersects(red_dot)){

      set the fill color;

      break;

    } else{

      set the fill color to something else

  }

  draw the yellow dot

after that draw all the red dots.

Does that make things easier?

-Lee

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[Jack Adee]

Thanks

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