How to save a random number?

siobhannx

So i'm trying to create raindrops with ripples at the end and I have it so that when the drop hits a random area between 400 and 500 on the y axis it resets back to -10. I want to have it so the ripples originate from that spot so I need to be able to save that random number for the ellipses but I can't figure it out.

I know this is a very basic question but I haven't been able to find any solutions..

Also what would be the best way to have a load of the raindrops at random values of x, falling at different times? I know that's a very basic question too.. but I tried a few things and nothing was working haha

Thanks for any help. This is the code I've got so far

int i;
float y=0;
float x =100;
int j=0;
float speed = 0;
int k;



void setup() {
  size(500, 500);
  frameRate(25);
}

void draw() {
  background(0);
  moveRaindrop(0.7);
  raindrop(100, 5);
}
void moveRaindrop (float gravity) {
  background(0);
  y = y +speed;
  speed = speed + gravity;
  float base = random(400, 500);


  if (y > base ) {
    noFill();
    stroke(255);
    ellipse(x, base, 200, 100);

    y=-10;
    speed = 0;
  }
}
void raindrop (float x, int size) {
  for (i=0; i<=5; i++) {
    j = i*7; 
    fill(255-(j*7));
    noStroke();
    rectMode(CENTER);
    rect(x, y-j, size, size);

    //println(y);
  }
}

GoToLoop

https://Processing.org/tutorials/objects/

http://studio.SketchPad.cc/sp/pad/view/ro.9l84$2z--gWui/latest

GoToLoop

https://www.Reddit.com/r/processing/comments/5psdct/question_beginner_how_to_save_a_random_number/

jeremydouglass

@siobhannx --

Also what would be the best way to have a load of the raindrops at random values of x, falling at different times?

The best way is to:

1. Create a Raindrop class
2. Create a large number of raindrop objects
3. Each object contains a (different) random location that is set when it is initialized with its constructor.
4. Loop through your list of raindrops and display them.

For more on this approach (to particles, cars, enemy spaceships, raindrops, etc.) see the Objects and Classes tutorials, e.g.:

• https://processing.org/tutorials/objects/
• https://processing.org/reference/class.html
• https://processing.org/reference/Object.html