Matrix Rain - OpenProcessing

mySketch
xxxxxxxxxx
 
float size = 10;
ArrayList<Coloumn> Matrix = new ArrayList<Coloumn>();
color matrixColour;
bool goingDown = true;
​
void setup(){
  fullScreen();
  
  matrixColour = color(0, 255, 0);
}
​
void draw(){
  background(0);
  Matrix.add(new Column());
  for(Coloumn thisCol:Matrix){
    thisCol.Render();
    if (thisCol.yPos >= height || thisCol.yPos <= 0){
      Matrix.remove(thisCol); 
    }
  }
}
​
void keyPressed () {
  if (key == ' ') {
    matrixColour = color(random(255), random(255), random(255));
  }else if (key == 's'){
    goingDown = !goingDown;
  }else if (key == 'a'){
    size -= 2;
  }else if (key == 'd'){
    size += 2;
  }
}
​
class Column{
  float xPos, yPos;
  int length;
  
  Column(){
    xPos = random(width);
    yPos = random(size*round(height/(size)));
  }
  
  void Render(){
    textMode(CENTER);
    fill(matrixColour);
    textSize(size);
    
    if (goingDown) {
      for(int i = 0; i<length; i += size){
        text(round(random(0, 9)).toString(), xPos, yPos+i);
      }
      
      if(yPos + length < height){
        length += size;
      }else{
        yPos += size;
        length -= size;
      }
    }else{
      for(int i = 0; i<length; i += size){
        text(round(random(0, 9)).toString(), xPos, yPos-i);
      }
      
      if (yPos - length > 0){
        length += size
      }else{
        yPos -= size;
        length -= size;
      }
    }
  }
}