MACD Indicator Histogram Border - Amibroker AFL Code

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_SECTION_BEGIN("MACD indicator display");
r1 = Param( "Fast avg", 12, 2, 200, 1 ); 
r2 = Param( "Slow avg", 26, 2, 200, 1 ); 
r3 = Param( "Signal avg", 9, 2, 200, 1 ); 

mm = MACD(r1, r2); 
ms = Signal(r1, r2, r3); 
mh = mm-ms; 
mc = IIf(mh>Ref(mh,-1),IIf(mh > 0,27,41),IIf(mh > 0,43,32)); 

Plot(mm,StrFormat(_SECTION_NAME()+"(%g,%g)", r1 ,r2),12,4); 
Plot(ms," Signal" + _PARAM_VALUES(),11); 
Plot(mh,"MACDHistogram",mc,6|styleNoTitle|32768|4096); 
Plot(mh,"MACDHistogram",mc,5|styleNoTitle|32768|4096); 
_SECTION_END();