MACD MTF Lines

The indicator shows the MACD histogram sign (positive or negative) for several timeframes at once. You can see at a glance how the price is trending across higher and lower timeframes.

The code uses recursive calculations for the SMA and EMA to avoid lookahead errors and repainting on higher timeframes.

Note that, for lower timeframes, the line becomes yellow to the left because history is limited and there are not enough bars to calculate.

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The indicator was updated to show the maximum number of lines supported.

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Each line can be enabled or disabled individually, so that unused ones can be hidden.

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Added simple trend detection based on the number of bullish and bearish timeframes; threshold can be changed in Settings.

Added data outputs:
* "Score": counting the net number of bullish and bearish timeframes
* "Trend": changes to bullish or bearish as the score goes over or under the threshold

Added background color (green or red according to trend); can be enabled in Settings.

Added alert for trend change.

Fix: named individual timeframe outputs.

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Added another alert with a separate threshold score for flexibility.

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Fix: minimum values set to 1.

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Added score weights for further customization of trend detection and alerts. Input parameters are now set in terms of score values instead of number of lines.

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Release notes:
Added input options to choose alert modes for trend and extra alerts. The options are:
* once per bar close (default)
* once per bar
* every time