The Zone Trades v1.0

//The Zone is mention in New Trading Dimensions by Bill Williams,PhD.
//The Zone is used for Entry Signal 
//Green Zone are painting Green Bars when Awesome Oscillator (AO) and Accelerater/Decelerator (AC) are both increasing.
//Red Zone are painting Red Bars when Awesome Oscillator (AO) and Accelerater/Decelerator (AC) are both decreasing.
//Gray Zone are painting Gray Bars AO and AC in difference changing 
//Gray Zone are indicate the indecision between bulls and bears. 
//Bill Williams, PhD. mention that Green Zone or Red Zone usually happen 6-8 bars Continuously. 
//The First Bar that change to be Green or Red color is the Signal Bar. 
//Entry Signal is the second bar in the same color as the Signal bar happen with Volume 
//Price go higher the high of previous Green Bar is Buy Signal. Entry Buy (Long) and place Stop at 1 tick lower the Low of previous bar.
//Price go ;ower the Low of previous Red Bars is Sell Signal. Entry Sell (Short) and place Stop at 1 tick higher the High of previous bar.
//Do not Entry if Green Bars or Red Bars completed 5 bars continuously.
//
// The Zone v.1.0

study(title="TheZone", overlay = true)
//calculate AO, AC
ao = sma(hl2,5) - sma(hl2,34)
ac = ao - sma(ao,5)

//Green Zone , Red Zone and Gray Zone 
zGreen() => ao > ao[1] and ac > ac[1]
zRed() => ao < ao[1] and ac < ac[1]
barcolor(zGreen() ? green : zRed() ? red : gray)

//Entry Signal