/***********************************************************************************************
Title:      TradeFlow Pressure Indicator for eSignal
By:         Divergence Software, Inc.
Web:        http://www.sr-analyst.com

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Dislaimer: For educational purposes only! Obviously, no guarantees whatsoever and use at your 
own risk.
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Project Description:   
===================

The TradeFlow-Pressure indicator provides a filtered view of either trade volume (i.e., total number of 
shares/contracts) or trades (i.e., total number of individual trades) using a rolling window based on 
bars. Specifically, the TradeFlow-Pressure indicator calculates the ratio of buy volume to sell volume 
(or trades if "Number of Trades" is selected) over the number of bars specified and plots this value in 
an indicator pane. Because of the rolling window feature (which reduces noise) this indicator is very 
useful for identifying divergences (i.e., price forms a higher-high while the TradeFlow-Pressure 
indicator forms a lower-high and vice-versa. The 'filtering' aspect allows you to focus your attention on 
only those trades that fall between a minimum and maximum trade size, which you specify using the 
indicator menu. Using this tool you can, for example, filter out the noise of the smaller traders and 
focus on what the larger traders are doing.

The default min/max trade sizes are set up with the S&P eMini in mind but, again, you can customize the 
values to work with most futures contracts and all stocks. This indicator will NOT work with currencies.

The plot is implemented as a histogram. A value above the zero-line indicates a prepoderance of buying/
covering while a value below the zero-line indicates a preponderance of selling/shorting. Note that the 
indicator will not begin plotting until the number of bars specified in the window size parameter have
completed.

Usage Notes:
===========

The TradeFlow-Pressure indicator uses data that is available in realtime only and, as such, it provides 
no historical plot (i.e., it begins operating from the current price bar when it is loaded). 

IMPORTANT!!!: 

1. If the indicator is refreshed or reloaded during the trading day, the plot will be cleared and will 
begin again from the current price bar. There is no way to restore the plot once the indicator has been 
refreshed or reloaded. Probably best to load the indicator into its own chart that you won't fiddle with 
during the trading day. If you are going to experiment with settings (which is a good idea) then do so 
after-hours using the eSignal Tick Replay feature, which allows you to walk through an entire trading day 
(tick-by-tick) at up to 200-times faster than 'realtime'.

2. Read #1 again.

Recommended usage would be to load it into a lower-interval chart (perhaps a 1-min or 30-second chart or
 even a tick chart) before the market opens and then let it run. If possible, load the indicator before 
9:00am EST and watch the pre-market activity.


Indicator Parameters:
====================

Define Trade Size to Monitor:

    Minimum Trade Size:     The smallest trade size (in shares/contracts) for a trade to be
                            considered for purposes of accumulating data. Default is 1.

    Maximum Trade Size:     The largest trade size (in shares/contracts) for a trade to be
                            considered for purposes of accumulating data. Default is 10000.

    Window Size:            The number of bars over which to calculate the ratio of buying 
                            to selling. The default is 10. You can input a value between
                            1 and 500.

    Buy Pressure Color:     The color to use for plotting the histogram bars that represent
                            buying. Default is green.

    Sell Pressure Color:    The color to use for plotting the histogram bars that represent
                            selling. Default is red.

        Thickness:          The plot thickness to use for the histogram. Default is 2. Range is 1-10.

        Line Type:          Select from Solid, Dot, Dash, DashDot, DashDotDot. Default is
                            Solid.

Reference Line Color:       The color to use for plotting the reference line (zero-line). Default
                            is black.

    Thickness:              The plot thickness to use. Default is 1. Range is 1-10.

    Line Type:              Select from Solid, Dot, Dash, DashDot, DashDotDot. Default is
                            Solid.

Logic:                      Select between "Analyze Volume" and "Analyze Trades". When "Analyze Volume"
                            is selected (the default) the indicator will calculate the ratio of
                            buy volume to sell volume over the window size specified. When
                            "Analyze Trades" is selected then each trade will be evaluated as
                            a unit for purposes of the calculation of the ratio (i.e., each trade
                            carries equal weight, regardless of the size of the trade).
                     

Disclaimer: For educational purposes only! Obviously, no guarantees whatsoever and use at your own risk.
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