在scene外面

<action name="do_crop_animation">
	<!-- 为热点注册属性 -->
	registerattribute(xframes, calc((imagewidth / %1) BOR 0));
	registerattribute(yframes, calc((imageheight / %2) BOR 0));
	registerattribute(frames, calc(xframes * yframes));
	registerattribute(frame, 0);

	set(crop, '0|0|%1|%2');

	setinterval(calc('crop_anim_' + name), calc(1.0 / %3),
		if(loaded,
			inc(frame);
			if(frame GE frames, if(onlastframe !== null, onlastframe() ); set(frame,0); );
			mod(xpos, frame, xframes);
			div(ypos, frame, xframes);
			Math.floor(ypos);
			mul(xpos, %1);
			mul(ypos, %2);
			calc(crop, xpos + '|' + ypos + '|%1|%2');
		  ,
			clearinterval(calc('crop_anim_' + name));
		  );
	  );
</action>

<hotspot name="spot1" url="animatedhotspot_white.png" onloaded="do_crop_animation(64,64, 60);"   ath="-15" atv="-12" onclick="looktohotspot(get(name),65)" />

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