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Processing Beginners
37

new version of same Sketch

Did you notice that you can (like in the image) click in a cell, and then click in a sub-cell and then again in a sub-cell and so on?

// New version 

ArrayList<GridCell> grid = new ArrayList<GridCell>();

void setup() {
  size(800, 800);
  background(255);

  final float w = width/4; 
  final float h = w;
  final color WHITE = color(255);

  for (float x = 0; x <= width; x+=w) {
    for (float y = 0; y <= height; y+=h) {
      grid.add(new GridCell(x, y, 
        w, h, 
        WHITE));
    }//for
  }//for
}//func

void draw() {
  background (255);

  // display all cells 
  for (GridCell currentCell : grid) { // can use short form of for-loop here
    currentCell.display();
  }//for

  // backward for-loop to remove dead ones here !! 
  // can't use short form of for-loop here
  // remove dead ones (you need to have a conventional for-loop here, backwards)
  for (int i=grid.size()-1; i>=0; i--) {
    if (grid.get(i).isDead) 
      grid.remove(i);
  }//for
}//func 

//---------------------------------------------------------------------------------

void mousePressed() {
  // search clicked cell:
  for (GridCell oldCell : grid) {  // short form of for-loop here
    // check mouse 
    if ( oldCell.onMouse() ) {
      // replace cell with 4 cells 
      grid.add(oldCell.getUpperLeftCorner());   // upper left corner (old pos)
      grid.add(oldCell.getUpperRightCorner());  // upper right corner 
      grid.add(oldCell.getLowerLeftCorner());   // lower left corner 
      grid.add(oldCell.getLowerRightCorner());  // lower right corner
      // kill old cell
      oldCell.isDead=true;
      // leave here (we found ONE cell, that's enough)
      return;
    }//if
  }//for
}//func 

//---------------------------------------------------------------------------------

color getRandomColor() {
  return
    color(random(255), random(255), random(255));
}//func

//====================================================================================================
//MAIN GRID CLASS //////////////////////////////////

class GridCell {

  float x, y; // pos
  float w, h; // size 
  boolean isDead = false; 
  color col1     = color(255);

  // constr 
  GridCell(float x_, float y_, 
    float w_, float h_, 
    color col1_) {
    x = x_;
    y = y_;
    w = w_;
    h = h_;
    col1 = col1_;
  }// constr 

  void display() {
    if (isDead)
      return; // leave when it's dead - no displaying 

    stroke(0);
    fill(col1);
    rect (x, y, 
      w, h);
  }//method

  boolean onMouse() { 
    if (isDead)
      return false; // leave with false (mouse is never recognized on a dead cell)

    // this can return true or false: 
    return 
      mouseX>x   &&
      mouseX<x+w &&
      mouseY>y   &&
      mouseY<y+w;
  }//method

  //--- make child cells (all with w/2) 

  GridCell getUpperLeftCorner() {  
    // upper left corner (old pos) 
    return new GridCell(x, y, 
      w/2, h/2, getRandomColor());
  } //method     

  GridCell getUpperRightCorner() {
    // upper right corner (x changed)
    return new GridCell(x+w/2, y, 
      w/2, h/2, getRandomColor());
  } //method

  GridCell getLowerLeftCorner() {
    // lower left corner (y changed) 
    return new GridCell(x, y+w/2, 
      w/2, h/2, getRandomColor());
  } //method

  GridCell getLowerRightCorner() {
    // lower right corner (x and y changed)
    return  new GridCell(x+w/2, y+w/2, 
      w/2, h/2, getRandomColor());
  } //method
  // 
  // ---
  //
}//class 
//
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