fs9 - FSDS351 - Win XP I am doing the VC of a 4 piston engined aircraft. The Mixture levers control two engines each, left and right pairs. I have the cockpit view XML gauges working properly as I can set both the (K:..._SET ) values in the same line of code with a simple 'd' [duplicate] command.My problem is that I cannot do a similar thing in the 'MakeMDL <part>' gauge, something like this:-

	<mouserect>		<cursor>Hand</cursor>		<help_id>HELPID_GAUGE_THROTTLE_MIXTURE</help_id>		<tooltip_id>TOOLTIPTEXT_THROTTLE_MIXTURE_PERCENT</tooltip_id>		<mouse_flags>LeftSingle+LeftDrag</mouse_flags>		<callback_dragging>			<variable>GENERAL ENG MIXTURE LEVER POSITION:1</variable>			<units>percent</units>			<scale>163.84</scale>			<yscale>163.84</yscale>			<minvalue>4424</minvalue>			<maxvalue>16384</maxvalue>			d			<event_id>MIXTURE1_SET</event_id>			<event_id>MIXTURE2_SET</event_id>		</callback_dragging>	</mouserect>

I have a <callback_code> routine that looked promising but after four days of tweaking I am unable to get an acceptable outputI cannot use an invisible lever since there is another pair of control levers that do a similar thing but for the outboard and inboard engines.Ted.

You cannot use two <EventID>s in a single mouse rectangle. You need to use <callback_code> instead:

		<callback_dragging>			<variable>GENERAL ENG MIXTURE LEVER POSITION:1</variable>			<units>percent</units>			<scale>163.84</scale>			<yscale>163.84</yscale>			<minvalue>4424</minvalue>			<maxvalue>16384</maxvalue>			<callback_code>				  (>K:MIXTURE1_SET)				  (>K:MIXTURE2_SET)			</callback_code>		</callback_dragging>

Why not store the value into s0 before assigning it to the first event_id and re-load it with l0 before the second event? Probably the first event_id kills the stack completely, so your duplication would be gone as well... But Bill is right, callback_code is more powerful for this kind of thing.

Thanks for the fast reply.

You cannot use two <EventID>s in a single mouse rectangle. You need to use <callback_code> instead:

		<callback_dragging>			<variable>GENERAL ENG MIXTURE LEVER POSITION:1</variable>			<units>percent</units>			<scale>163.84</scale>			<yscale>163.84</yscale>			<minvalue>4424</minvalue>			<maxvalue>16384</maxvalue>			<callback_code>				  (>K:MIXTURE1_SET)				  (>K:MIXTURE2_SET)			</callback_code>		</callback_dragging>

Can the <callback_code> tags be wrapped in <callback_dragging> tags ?I have had a look in the default MakeMdl.parts file but there is no part like that to examine.I have tried to get the value that is passed to the <event_id> to be passed into the <callback_code> but nothing happens. The cursor appears with the usual grabbing action but thats all.I am now trying to get a proper dragging action using a simple <callback_code> in the <mouserect> section.

I abandoned the <callback_dragging> route and finally had some success with this cunning code. 'LULU' is my test modelNote that I needed the minimum mixture to be 27% but it was developed using 0% as the minimum. Just change the 0.27 and 4424 values to 0.

<part>	<name>lever_double_mixture</name>	<!-- LULU -->		<animation>		<rotation>Y</rotation>		<parameter>			<code>				(A:GENERAL ENG MIXTURE LEVER POSITION:2,part) 0.27 max 1 min 100 *			</code>		</parameter>	</animation>	<mouserect>		<cursor>Hand</cursor>		<tooltip_text>Port mixtures</tooltip_text>		<mouse_flags>LeftSingle+LeftDrag</mouse_flags>		<callback_code>			(M:Event) 'LeftSingle' scmp 0 != 				if{ (L:Pmixref, position) 0 !=					if{ (L:Pmixref, position) (M:Y) - 400 / /-/ (A:General eng mixture lever position:2,part) + 						16384 * int 16384 min 4424 max d (>K:MIXTURE1_SET) (>K:MIXTURE2_SET) }					   }				(M:Y) (>L:Pmixref, position)		 </callback_code> 	</mouserect></part>