I've been tinkering with the Plot function for a while in order to be able and Plot oscilators like this : https://i.imgur.com/YUPFJu0.png
Here is the commented formula (you can also view it here, it might be easier to read) : http://pastebin.com/Xqb4cu7H
You can use this formula "as is", just change the first 5 lines :
oscillator = ... // put your oscillator function here
lowBound = ... // low horizontal line under which we color the oscillator
highBound = ... // high horizontal line over which we color the oscillator
oscilMin = ... // default = 0 : forces the Plot to draw at least to that (low) level
oscilMax = ... // default = 100 : forces the Plot to draw at least to that (low) level
/*
-------------------------------------------------------------------
HIGH BOUNDARY of PLOT
PLOT `oscillator`, fill to zero with color/hatch, then plot
`highBound` line and fill to zero with Green
-------------------------------------------------------------------
*/
// first plot the oscillator
// if you want color filled zone, use :
plot(oscillator, "Choppiness Index", colorRed|50, ChartLine, StyleDotted|StyleNoScale|StyleWidth0);
// if you dont want a color filled zone, use :
//plot(oscillator, "Choppiness Index", colorLightGray);
// hatch underneath it
SetHatchBrush("BackwardDiagonal", colorRed); // hatch zone under index curve
Plot(highBound, "", colorWhite|255, ChartLine, StyleDotted|StyleNoScale|StyleWidth0); // erase all under `highBound` horiz line
/*
-------------------------------------------------------------------
LOW BOUNDARY of PLOT
PLOT segments of `lowBound` line where `choppiness` < `lowBound`
and fill to zero with Green
(we have to segment so as not to erase the previous plot of
highbound color fill/hatch)
-------------------------------------------------------------------
*/
// determine segments
a = iff(oscillator <= lowBound, lowBound, 0);
// if you wish to fill the zone with a single color instead of hatching it,
// replace following line with : Plot(a, "", colorGreen|55, ChartLine, StyleDotted|StyleNoScale|StyleWidth0);
// otherwise, use Plot(a, "", colorGreen, ChartLine, StyleDotted|StyleNoScale|StyleWidth0);
// hatch the zone (comment out if you do not want to hatch)
SetHatchBrush("BackwardDiagonal", colorGreen); // hatch zone under index curve
// erase all under `oscillator` in the zone where `oscillator` < `lowBound`
b = iff(oscillator <= lowBound, oscillator, 0);
Plot(b, "", colorWhite|255, ChartLine, StyleDotted|StyleNoScale|StyleWidth0);
/*
-------------------------------------------------------------------
MAIN CURVE
Finally, plot the whole curve again, and adapt colors of its
sections.
-------------------------------------------------------------------
*/
// refresh the oscillator line
plot(oscillator, "Choppiness Index", colorDarkGray);
// optionally : overwrite lowBound portion with custom color
testLow = oscillator < lowBound and oscillator[-1] < lowBound; // in order to have fastcross segments colored
updatecolor(testLow, colorDarkGreen);
testHigh = oscillator > highBound and oscillator[-1] > highBound; // in order to have fastcross segments colored
updatecolor(testHigh, colorDarkRed);
// finally plot the `highBound` and `lowBound` lines
Plot(highBound, 'high', colorLightGray, ChartLine,StyleDashed); // `highBound` horiz line
Plot(lowBound, 'low', colorLightGray, ChartLine,StyleDashed);
// and the oscilMax & oscilMin so as to frame the region
Plot(oscilMax, "", colorTransparent);
Plot(oscilMin, "", colorTransparent);
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