text: 
  /**
  	Object representing a pixel
  	l : line
  	c : column
  	on : pixel is colored or not
  	used : pixel is used in char or not
  */
  class Pixel{
  	constructor(l, c, on) {
  		this.l = l? l : null;
  		this.c = c? c : null;
  		this.on = on? on : false;
  		this.used = false;
  	}
  
  	turnOn(){
  		this.on= true;
  	}
  
  	turnOff(){
  		this.on= false;
  	}
  	switch(){
  		this.on= !this.on;
  	}
  
  	used(){
  		this.used = true;
  	}
  
  	init(){
  		this.used = true;
  		this.on = true;
  	}
  	// remove the color from the pixel
  	static turnOff(pix){
  		pix.on = false;
  	}
  
  	// signals to add color to the pixel
  	static turnOn(pix){
  		pix.on = true;
  	}
  }