## Standard Class Standard_PhoenixJulia

```Object
common:Generic
common:Formula
common:DivergentFormula
Standard:Standard_PhoenixJulia
```

`class DivergentFormula:Standard_PhoenixJulia`

Object version of PhoenixJulia in Standard.ufm. Phoenix fractal type discovered by Shigehiro Ushiki. The general equation is of the form z(n+1) = z(n)^a + c*z(n)^b + p*z(n-1) If a=2 and b=0 (classic Phoenix) then this type will work with the Smooth and Triangle Inequality coloring algorithms. Originally written by Damien M. Jones.

Ultra Fractal Source
``` class Standard_PhoenixJulia(common.ulb:DivergentFormula) {
;
; Object version of PhoenixJulia in Standard.ufm.
;
; Phoenix fractal type discovered by Shigehiro Ushiki. The
; general equation is of the form
;
;     z(n+1) = z(n)^a + c*z(n)^b + p*z(n-1)
;
; If a=2 and b=0 (classic Phoenix) then this type will
; work with the Smooth and Triangle Inequality coloring
; algorithms.
;
; Originally written by Damien M. Jones.
;
public:
complex func Init(complex pz)
fY = (0, 0)
return pz
endfunc

complex func Iterate(complex pz)
complex newz = pz^@p_power + pz^@power2 * @seed + @induct * fY
fY = pz
return newz
endfunc

private:
complex fY

default:
title = "Phoenix (Julia)"
helpfile = "Uf*.chm"
helptopic = "Html/formulas/standard/phoenix.html"
rating = recommended
param seed
caption = "Julia Seed"
default = (0.56667,0)
hint = "This is the Julia seed, a constant parameter which \
defines the shape of the fractal. Use the Explore or Eyedropper \
features to find interesting values for this parameter."
endparam
param p_power ; Overrides p_power from Formula
caption = "Exponent 1"
default = (2,0)
hint = "Defines the primary exponent for the fractal.  The classic \
Phoenix curve uses exponent (2, 0)."
endparam
param power2
caption = "Exponent 2"
default = (0,0)
hint = "Defines the secondary exponent for the fractal.  The classic \
Phoenix curve uses exponent (0, 0)."
endparam
param induct
caption = "Distortion"
default = (-0.5,0)
hint = "Sets how 'strong' the previous iteration's effect should be \
on the fractal."
endparam
param p_bailout ; Overrides p_bailout from DivergentFormula
caption = "Bailout"
default = 1.0e20
exponential = true
hint = "This parameter defines how soon an orbit bails out while \
iterating. Larger values will give smoother outlines."
endparam
}
```

Constructor Summary
`Standard_PhoenixJulia()`

Method Summary
` complex` `Init(complex pz)`
Set up for a sequence of values
` complex` `Iterate(complex pz)`
Produce the next value in the sequence

Methods inherited from class common:DivergentFormula
`GetUpperBailout, IsBailedOut`

Methods inherited from class common:Formula
`GetLowerBailout, GetPrimaryExponent`

Methods inherited from class common:Generic
`GetParent`

Methods inherited from class Object

Constructor Detail

### Standard_PhoenixJulia

`public Standard_PhoenixJulia()`
Method Detail

### Init

`public complex Init(complex pz)`
Description copied from class: `DivergentFormula`
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 `DivergentFormula`
Parameters:
`pz` - seed value for the sequence; for a normal fractal formula, this will be #pixel
Returns:
first value in the sequence; this corresponds to #z in a fractal formula

### Iterate

`public complex Iterate(complex pz)`
Description copied from class: `Formula`
Produce 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.

Overrides:
`Iterate` in class `Formula`
Parameters:
`pz` - previous value in the sequence; corresponds to #z in a fractal formula. Note that you should always use this value for computing the next iteration, rather than a saved value, as the calling code may modify the returned value before passing it back to the next Iterate() call.
Returns:
the next value in the sequence