# I need help with a project

**URL:** <https://discourse.processing.org/t/i-need-help-with-a-project/25952>\
**Category:** Coding Questions\
**Created:** [December 4, 2020, 6:52pm UTC](https://discourse.processing.org/t/i-need-help-with-a-project/25952 "2020-12-04T18:52:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![psn](https://avatars.discourse-cdn.com/v4/letter/p/9d8465/32.png) [@psn](https://discourse.processing.org/u/psn)\
**Post date:** [December 4, 2020, 6:52pm UTC](https://discourse.processing.org/t/i-need-help-with-a-project/25952/1 "2020-12-04T18:52:47Z")

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Hello! I have made a sketch with bouncing balls, where every time i click, a new ball appears. I want every new ball to have a random colour. Thank you!

````auto
//GLOBAL VARIABLES
Ball myBall;
Text myText;
Cursor myCursor;
final static ArrayList<Ball> balls = new ArrayList();

//CLASSES

//BALL CLASS
class Ball {
  float x, y;
  float speedX=5;
  float speedY=5;
  Ball(float _x, float _y) {
    x=_x;
    y=_y;
  }
  void run() {
    display();
    move();
    bounce();
    hit();
  }
  void bounce() {
    if (x>width || x<0) {
      speedX=speedX*-1;
    } else if (y>height || y<0) {
      speedY=speedY*-1;
    }
  }
  void move() {
    x+=speedX;
    y+=speedY;
  }
  void display() {
    ellipse(x, y, 15, 15);
  }
  void hit() {
    if (x>width ||x<0 ||y>height || y<0) {
      hit.play();
      myText.ballHit += 1;
    }
  }
}

//TEXT CLASS
class Text {
  int ballHit = 0;
  int spawnedBalls = 0;
  void drawText() {
    text("The balls have hit the border " + ballHit + " times", 25, 25);
    text("There are a total of " + spawnedBalls + " balls", 25, 50);
  }
}

//CURSOR CLASS
class Cursor {
  void drawCursor() {
    ellipse(mouseX,mouseY,25,25);
  }
}

void setup() {
  size(600, 600);
  smooth();
  fill(0);
  myBall=new Ball(0, 0);
  myText=new Text();
  myCursor=new Cursor();
}

void draw() { //MAIN CODE HERE
  background(#FFFFFF);
  for (Ball b : balls) b.run();
  myText.drawText();
  myCursor.drawCursor();
}

void mousePressed() {
  balls.add(new Ball(mouseX, mouseY));
  myText.spawnedBalls += 1;
}```
````

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<div class="post-metadata">

**Author:** ![wavesmith](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/wavesmith/32/11234_2.png) [@wavesmith](https://discourse.processing.org/u/wavesmith)\
**Post date:** [December 4, 2020, 7:28pm UTC](https://discourse.processing.org/t/i-need-help-with-a-project/25952/2 "2020-12-04T19:28:17Z")

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To start with you could add a new color attribute to the Ball class (e.g. `color c`). Accordingly update the constructor to take a color parameter: `Ball(float _x, float _y, color _c)`  
Finally in the display function you can add `stroke(c)` or `fill(c)` to color the outline or fill of the ball.  
Now you can send in a random color every time you create a new ball like so:  
`new Ball(mouseX, mouseY, color(random(255),random(255),random(255)))`

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<div class="post-metadata">

**Author:** ![psn](https://avatars.discourse-cdn.com/v4/letter/p/9d8465/32.png) [@psn](https://discourse.processing.org/u/psn)\
**Post date:** [December 4, 2020, 8:00pm UTC](https://discourse.processing.org/t/i-need-help-with-a-project/25952/3 "2020-12-04T20:00:28Z")

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Thank you so much kind sir