HW03-2

In this homework, I learned how to create a custom class called Button. With this custom class, I managed to add custom actions like when you click on the button, there will be a cross X on that button indicates that this color is being selected.
Here's the source code class Button:

color selectedColor = 0;
int selectedX = 0, selectedY = 0;

class Button {
  int x, y; // The x- and y-coordinates
  int size; // Dimension (width and height)
  color baseColor; // Default gray value
  color overColor; // Value when mouse is over the button
  color pressColor; // Value when mouse is over and pressed
  boolean over = false; // True when the mouse is over
  boolean pressed = false; // True when the mouse is over and pressed
  Button(int xp, int yp, int s, color b, color o, color p) {
    x = xp;
    y = yp;
    size = s;
    baseColor = b;
    overColor = o;
    pressColor = p;
  }
  // Updates the over field every frame
  void update() {
    if ((mouseX >= x) && (mouseX <= x+size) &&
      (mouseY >= y) && (mouseY <= y+size)) {
      over = true;
    } 
    else {
      over = false;
    }
  }
  boolean press() {
    if (over == true) {
      pressed = true;
      selectedX = x;
      selectedY = y;
      selectedColor = pressColor;
      return true;
    } 
    else {
      pressed = false;
      return false;
    }
  }
  void release() {
    //pressed = false; // Set to false when the mouse is released
  }
  void display() {
    if (pressed == true) {
      fill(pressColor);
    } 
    else if (over == true) {
      fill(overColor);
    } 
    else {
      fill(baseColor);
    }

    strokeWeight(1);
    stroke(255);
    rect(x, y, size, size);

    if (selectedX == x && selectedY == y) {
      fill(255);
      line(x+5, y+5, x+35, y+35);
      line(x+5, y+35, x+35, y+5);
    }
  }
}