Follow Mouse Plugin

<plugin name="mouseFollowOnBtn" url="mouse-follow-on.png" alpha="0.9" visible="false" align="lefttop" edge="lefttop" y="-4" x="852" blendmode="normal" keep="true" onclick="action(mouseFollowOn);"/>
	<plugin name="mouseFollowOffBtn" url="mouse-follow-off.png" alpha="0.9" visible="true" align="lefttop" edge="lefttop" y="-4" x="852" blendmode="normal" keep="true" onclick="action(mouseFollowOff);"/>


	<action name="mouseFollowOn">
		addplugin(mousefollow);
		set(plugin[mousefollow].enabled, true);
		set(plugin[mouseFollowOffBtn].visible, true);
		set(plugin[mouseFollowOnBtn].visible, false);
	</action>	
	
	<action name="mouseFollowOff">
		set(plugin[mouseFollowOffBtn].visible, false);
		set(plugin[mouseFollowOnBtn].visible, true);
		removeplugin(mousefollow);
		set(hlookat_moveforce, 0);
		set(vlookat_moveforce, 0);


	</action>

package
{
    import flash.display.Sprite;
    import flash.events.Event;


    import krpano_as3_interface;




    public class followmouse extends Sprite
    {
        private var krpano : krpano_as3_interface = null;


        private var control_mousetype_backup:String = null;
		private var pluginpath : String = null;
		private var pluginobj  : Object = null;
		
        public function followmouse()
        {
            if (stage == null)
            {
                this.addEventListener(Event.ADDED_TO_STAGE, startplugin);
                this.addEventListener(Event.REMOVED_FROM_STAGE, stopplugin);
            }
        }


        private function startplugin(evt:Event):void
        {
            krpano = krpano_as3_interface.getInstance();
			
			//register actions to flash functions
			pluginpath = evt.data;							
        	pluginobj  = krpano.get(pluginpath);
			krpano.set(pluginpath+".stopit", startListening);
			krpano.set(pluginpath+".startit", stopListening);
			
            if ( krpano.get("version") < "1.0.7" )
            {
                krpano.call("error(followmouse plugin - wrong krpano version! 1.0.7 or higher needed);");
                return;
            }


            // save current control mode
            control_mousetype_backup = krpano.get("control.mousetype");
            
            // disable default mouse control
            krpano.set("control.mousetype", "off");


            // add frame listener -- DISABLED SO YOU CAN MANUALLY CALL IT
            //addEventListener(Event.ENTER_FRAME, enterFrameHandler);
        }
        private function stopListening():void
		{
			 stopplugin(null);
		}
		private function startListening():void
		{
			 addEventListener(Event.ENTER_FRAME, enterFrameHandler);
		}
        private function stopplugin(evt:Event):void
        {
            // remove frame listener
            removeEventListener(Event.ENTER_FRAME, enterFrameHandler);
                    
            // restore old controlmode
            krpano.set("control.mousetype", control_mousetype_backup);
        }


        private function enterFrameHandler(event:Event):void
        {
            var mx:Number = stage.mouseX;
            var my:Number = stage.mouseY;
            var sx:Number = stage.stageWidth  * 0.5;
            var sy:Number = stage.stageHeight * 0.5;


            // calc motion vectors: -1.0 to +1.0
            var vx:Number = (mx - sx) / sx;
            var vy:Number = (my - sy) / sy;


            // advance it a little bit:
            // - make moving slower in the middle
            // - and faster in the outer regions
            vx = (vx < 0 ? -1.0 : +1.0) * Math.pow(Math.abs(vx), 2.0);
            vy = (vy < 0 ? -1.0 : +1.0) * Math.pow(Math.abs(vy), 2.0);
            
            // stop very slow moving
            if (Math.abs(vx) < 0.01)    vx = 0;
            if (Math.abs(vy) < 0.01)    vy = 0;


            // set move forces
            krpano.set("hlookat_moveforce", vx);
            krpano.set("vlookat_moveforce", vy);
        }
    }
}