```Object
common:Generic
common:Coloring
mmf:DistanceEstimatorBase
```

`class DistanceEstimatorBase:MMF_NovaDistanceEstimator`

Distance Estimator for the Nova formula.

Ultra Fractal Source
``` class MMF_NovaDistanceEstimator(DistanceEstimatorBase) {
; Distance Estimator for the Nova formula.
public:
import "common.ulb"
; @param pparent the parent, generally "this" for the parent, or zero
DistanceEstimatorBase.DistanceEstimatorBase(pparent)
endfunc
; @param pz
; @param ppixel
func Init(complex pz, complex ppixel)
DistanceEstimatorBase.Init(pz, ppixel)
zold = pz
odz = 1.0
; Note that the running derivative calculation could be optimised
if @julia
complex fz = (@power - @relax)*pz^@power + @relax
complex gz = @power*pz^(@power - 1.0)
complex dfz = @power*(@power - @relax)*pz^(@power - 1.0)
complex dgz = @power*(@power - 1.0)*pz^(@power - 2.0)
dz = (dfz*gz - fz*dgz)/sqr(gz)
else
dz = 1.0
endif
endfunc
; @param pz
func Iterate(complex pz)
;    m_Iterations = m_Iterations + 1
complex fz = (@power - @relax)*pz^@power + @relax
complex gz = @power*pz^(@power - 1.0)
complex dfz = @power*(@power - @relax)*pz^(@power - 1.0)
complex dgz = @power*(@power - 1.0)*pz^(@power - 2.0)
zold = pz
odz = dz
dz = dz*(dfz*gz - fz*dgz)/sqr(gz)
endfunc
; @param pz
float func ResultIndex(complex pz)
float a = 0.0
float d = 0.0
pz = pz - zold
dz = dz - odz
if @modec=="Angle" || @modec=="Combined"
if (a = atan2(pz/dz)*(0.5/#pi))<0.0
a = a + 1.0
endif
if @modec=="Angle"
return a
endif
endif
if @modec=="Distance" || @modec=="Combined"
if @fixit && @julia
d = 0.5*cabs((@power - 1.0)*pz)
d = -d*log(d)/cabs(dz)
else
d = cabs(pz/dz)
endif
if @modec=="Distance"
return d
endif
endif
return a+d
endfunc
; @param pz
; @return the distance
float func ResultDistance(complex pz)
if @fixit && @julia
float v = 0.5*cabs((@power - 1.0)*(pz - zold))
return -v*log(v)/cabs(dz-odz)
endif
return cabs((pz-zold)/(dz-odz))
endfunc
; @param pz
; @return the angle (from 0 to 1)
float func ResultAngle(complex pz)
float r = 0.0
if (r=atan2((pz-zold)/(dz-odz))*(0.5/#pi))<0.0
r = r + 1.0
endif
return r
endfunc

protected:
complex zold
complex odz

default:
title = "MMF Nova Distance Estimator"
caption = "Version (MMF Nova Distance Estimator)"
enum = "1.0"
default = 0
hint = "This field is to absolutely ensure backward compatibility, \
the default will always be set to the latest version, but \
there may be some cases where an older effect that you like \
is lost in an update and you could still use it by selecting \
the older version number."
visible = false
endparam
text = "Note that this colouring is only based on distance estimation, \
it's not really accurate at true distance estimation."
bool param julia
caption = "Julia ?"
default = false
hint = "Enable when the main formula is a Julia."
endparam
bool param fixit
caption = "Fix Julias ?"
default = false
hint = "When enabled the DE is better for some Julia Sets."
visible = @julia
endparam
int param modec
caption = "Mode"
enum = "Distance" "Angle" "Combined"
default = 0
endparam
complex param power
caption = "Nova Power"
default = (3,0)
hint = "This should match the power in the main formula."
endparam
complex param relax
caption = "Relaxation"
default = (1,0)
hint = "This should match the relaxation in the main formula."
endparam
}
```

Constructor Summary
`MMF_NovaDistanceEstimator()`

`MMF_NovaDistanceEstimator(Generic pparent)`

Method Summary
` void` ```Init(complex pz, complex ppixel)```
Set up for a sequence of values
` void` `Iterate(complex pz)`
Process the next value in the sequence
` float` `ResultAngle(complex pz)`

` float` `ResultDistance(complex pz)`

` float` `ResultIndex(complex pz)`
Produce a resulting color index after a sequence is finished

`IsGradient, IsSolid, Result`

Methods inherited from class common:Coloring
`GetPixel`

Methods inherited from class common:Generic
`GetParent`

Methods inherited from class Object

Constructor Detail

`public MMF_NovaDistanceEstimator(Generic pparent)`
Parameters:
`pparent` - the parent, generally "this" for the parent, or zero

`public MMF_NovaDistanceEstimator()`
Method Detail

### Init

```public void Init(complex pz,
complex ppixel)```
Description copied from class: `GradientColoring`
Set up for a sequence of values

This function will be called at the beginning of each sequence of values (e.g. at the beginning of each fractal orbit).

Overrides:
`Init` in class `GradientColoring`
Parameters:
`pz` -
`ppixel` -

### Iterate

`public void Iterate(complex pz)`
Description copied from class: `GradientColoring`
Process the next value in the sequence

As long as the sequence has not bailed out, this function will be continually called to produce sequence values. Note that such processing generally will not know in advance precisely how long the sequence is, and should be prepared to deal with sequences of arbitrary length.

Your coloring may determine at some point that a solid color should be used rather than an index value.

Overrides:
`Iterate` in class `GradientColoring`
Parameters:
`pz` -

### ResultIndex

`public float ResultIndex(complex pz)`
Description copied from class: `GradientColoring`
Produce a resulting color index after a sequence is finished

This corresponds to the final: section in a coloring formula. Once it is called, no further calls to Iterate() should be made without calling Init() first.

Overrides:
`ResultIndex` in class `GradientColoring`
Parameters:
`pz` -
Returns:

### ResultDistance

`public float ResultDistance(complex pz)`
Overrides:
`ResultDistance` in class `DistanceEstimatorBase`
Parameters:
`pz` -
Returns:
the distance

### ResultAngle

`public float ResultAngle(complex pz)`
Overrides:
`ResultAngle` in class `DistanceEstimatorBase`
Parameters:
`pz` -
Returns:
the angle (from 0 to 1)