Increasing Decreasing Volume Meter - Amibroker AFL Code

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_SECTION_BEGIN("Market Thermometer");

H1 = Ref(H, -1);
L1 = Ref(L, -1);

T = IIf(H<H1 AND L>L1, 0, IIf(H-H1>L1-L, H-H1, L1-L));

Val1 = H-H1;
Val2 = L1-L;
Val = IIf(Val1>Val2, Val1, Val2) ;
 

Avgval = Median(Val, 22);

color= IIf (Val < Avgval, colorBlue, IIf(Val >= Avgval AND Val < Avgval * 3, colorViolet, IIf(Val > Avgval * 3, colorOrange, colorViolet)));


Plot(T, _DEFAULT_NAME(), color, styleHistogram | styleThick);
P = ParamField("Price field",-1);
Periods = Param("Periods", 22, 2, 200, 1, 10 );

Plot( EMA( P, Periods ), "EMA 22", colorGreen, styleThick); 

_SECTION_END();