2D grid array question

Processing Coding Questions
17

in this version

int num = 10,cols = num, rows = cols;          // Number of columns and rows in the grid
Button [][] myButtons= new Button[cols][rows]; // 2D Grid Array of Button objects
color background = color (random(255), random(255), random(255));

void setup() {
  size(500, 500);
  int x = (width/num)/2, y = x;
  for (int i = 0; i < cols; i++) {
    for (int j = 0; j < rows; j++) {
      // Initialize each object
      myButtons[i][j] = new Button (x+ i*(width/cols), y+ j*(height/rows), 
        color (random(255), random(255), random(255)), // random colors
        color (random(255), random(255), random(255)), // new random colors when mouseOver
        (width/num));
    }
  }
}

void draw() {
  background(background);
  for (int i = 0; i < cols; i++)
    for (int j = 0; j < rows; j++)     
      myButtons[i][j].display();
}
void keyReleased() {

  for (int i = 0; i < cols; i++) {
    for (int j = 0; j < rows; j++) {
      myButtons[i][j].keyPressed();
    }
  }
}

//////////////////////////////

class Button {
  float x, y;
  color colRect;
  color colRect2;

  float sz;
  boolean off = true; // button starts in OFF position

  Button ( 
    float tempX, float tempY, 
    color tempColor, color tempColor2, float tempSz) {

    x = tempX;
    y = tempY;

    colRect = tempColor;
    colRect2 = tempColor2;

    sz = tempSz;
  }

  void display() {
    mouseOver();
    if (off)   fill (colRect);
    else       fill (colRect2);
    noStroke();
    rectMode(CENTER);
    rect(x, y, sz, sz);
  }

  void mouseOver() {
    if (mouseX > x - sz/2 && 
      mouseX < x + sz/2 &&
      mouseY > y - sz/2 &&
      mouseY < y + sz/2)       off = false;
    else                       off = true;
  }

  void keyPressed() {
    if ( ! off ) {
      if      (keyCode== UP)    y -= 1;
      else if (keyCode== DOWN)  y += 1;
      else if (keyCode== LEFT)  x -= 1;
      else if (keyCode== RIGHT) x += 1;
    }
  }
}

the mouse position selects a rectangle
and the keyboard operation does move only that on rectangle
( it was not clear if that is the operation concept you wanted to test )
it is not a very good concept as when the rect moves it will go outside the mouse position and stop moving…

possibly change to mouse click selects one rectangle ( might need to deselect all others )
and then key can move it around the canvas

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