virtual bool control() override
	{
		if(joystickIntervalCounter++ > 40){
	        joystickIntervalCounter = 0;
	        joystick.readCurrentState();
	    }

		double thrust[2];
		double thrust_updown;
	    double hyd = 0.0;

	    thrust[0]  = -joystick.getPosition(3); // right
	    thrust[1]  = -joystick.getPosition(1); // left
	    thrust_updown = joystick.getPosition(5); //up、down

	    ThrusterDevice* thrusterDevice[3];

	    for(size_t i = 0; i < thrusts.size(); ++i){
	    	thrusterDevice[i] = thrusts[i];

	    	if(thrusts[i]->id()){
	    		// Set hydraulic power.
	    		if(thrust[i - 1]){
	    			hyd = thrust[i - 1] * 0.75;

	    		}else{
	    			hyd = 0.0;

	    		}
	    	}else{
	    	   	if(thrust_updown){
	    	   		hyd = thrust_updown * 0.75;

	    	   	}else{
	    			hyd = 0.0;

	    		}
	       }
	    	thrusterDevice[i]->setHydraulic(hyd);
	    	thrusterDevice[i]->notifyStateChange();
	    }

	    if(light){
	    	bool changed = false;
	        bool lightButtonState = joystick.getButtonState(0);

	        if(lightButtonState){
	            if(!prevLightButtonState){
	                light->on(!light->on());
	                changed = true;

	            }
	        }

	        prevLightButtonState = lightButtonState;

	        if(changed){
	        	light->notifyStateChange();

	        }
	    }

		return true;

	}