function onTouchStart ( event ) {

		if ( event.target.className.indexOf( 'noMapDrag' ) !== -1 ) {

			return;

		}

		// set the state to the dragging state

		controller.rotationHandler.setDragging( true );
		pressX = mouseX;
		pressY = mouseY;
		controller.rotationHandler.clearRotateTargetX();

    }
on a specific condition will let the SwitchCountryHandler to execute switch
condition:
1. the picked color is actually a color to represent a country
2. the picked color is not 0 (0 represents ocean)
3. if the user want only the mentioned countries can be clicked, it will judge whether the picked country is mentioned