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Positioning area plots behind the grid lines

When we want to paint the background with custom colors to indicate certain states or conditions – we can use area plots style for this purpose. The code example presented below shows green background when Close stays above 50-period moving average and red when below MA-50.

PlotClose"Close"colorDefaultstyleThick);
PlotMA50 MA(Close,50), "MA50"colorBluestyleThick);

color IIfClose MA50colorGreencolorRed );
Plot1""colorstyleArea|styleOwnScale,0,);

However – by default both grid lines and the selector line would get covered by the area plot:

area chart

There is an easy fix for that – AmiBroker allows to specify the Z-axis position too, so we can shift the visibility and order of plots (including their position against grids and other elements) by means of Z-order argument of Plot function.

If we specify the Z-order argument to -1 that means we move the particular plot one level behind and this would also be located below the grids.

PlotClose"Close"colorDefaultstyleThick);
PlotMA50 MA(Close,50), "MA50"colorBluestyleThick);

color IIfClose MA50colorGreencolorRed );
Plot1""colorstyleArea|styleOwnScale,0,1,0,-); // the 8th argument specifies z-order

fixed z-order area chart

More information about use of Z-order can be found in the User’s Guide:
http://www.amibroker.com/guide/h_indbuilder2.html