function(opt_options) {
    this.canvas_ = document.createElement("canvas");
    opt_options = opt_options || {};
    this.direction_ = opt_options.direction || null;
  }
function(opt_options) {
    this.canvas_ = document.createElement("canvas");
    opt_options = opt_options || {};
    this.direction_ = opt_options.direction || null;
  }
function ( opt_options ) { this . canvas_ = document . createElement ( "canvas" ) ; opt_options = opt_options || { } ; this . direction_ = opt_options . direction || null ; }
Creates the crosshair

@constructor
Creates the crosshair