dmj5
Class DMJ_LogSpiral

Object
  common:Generic
      common:Transform
          common:UserTransform
              dmj5:DMJ_LogSpiral

class 
UserTransform:DMJ_LogSpiral

Distort to follow a logarithmic spiral. (Ported from dmj3.uxf:dmj3-LogSpiral)

Ultra Fractal Source

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 class DMJ_LogSpiral(common.ulb:UserTransform) {
   ; Distort to follow a logarithmic spiral.
   ; (Ported from dmj3.uxf:dmj3-LogSpiral)
   
 public:
   import "common.ulb"
   
   func DMJ_LogSpiral(Generic pparent)
     UserTransform.UserTransform(pparent)
   endfunc
 
   complex func Iterate(complex pz)
     m_Iterations = m_Iterations + 1
 
     float a = atan2(pz - @p_spiralcenter) * 0.5 / #pi
     float d = cabs(pz - @p_spiralcenter)
     float d2 = log(d)*@p_spiraltightness + a
     float d2f = d2 - floor(d2)
     float d2i = d2 - d2f
 
     pz = (d2i-a)*@p_spiralascale + flip(d2f)*@p_spiraldscale + @p_spiraloffset
 
     return pz
   endfunc
 
 protected:
 
 default:
   title = "Log Spiral"
 
   int param v_dmj_logspiral
     caption = "Version (DMJ_LogSpiral)"
     default = 100
     hint = "This version parameter is used to detect when a change has been made to the formula that is incompatible with the previous version. When that happens, this field will reflect the old version number to alert you to the fact that an alternate rendering is being used."
     visible = @v_dmj_logspiral < 100
   endparam
 
   complex param p_spiralcenter
     caption = "Spiral Center"
     default = (0,0)
   endparam
   float param p_spiralascale
     caption = "Rotational scale"
     default = 1.0
   endparam
   float param p_spiraldscale
     caption = "Distance scale"
     default = 1.0
   endparam
   float param p_spiraltightness
     caption = "Tightness"
     default = 1.0
   endparam
   complex param p_spiraloffset
     caption = "Strip Offset"
     default = (0,0)
   endparam
 }
 

Constructor Summary

DMJ_LogSpiral()

DMJ_LogSpiral(Generic pparent)

Method Summary

complex

Iterate(complex pz) Transform a single point within a sequence

Methods inherited from class common:Transform

Init, IsSolid, IterateSilent

Methods inherited from class common:Generic

GetParent

Methods inherited from class Object

Constructor Detail

DMJ_LogSpiral

public DMJ_LogSpiral(Generic pparent)

DMJ_LogSpiral

public DMJ_LogSpiral()

Method Detail

Iterate

public complex Iterate(complex pz)

Description copied from class: Transform

Transform a single point within a sequence

After a sequence has been set up with Init(), this function will be called once for each value in the sequence. Note that all values in the sequence must be processed in order (they cannot be processed out of order). If the sequence contains only one value, Init() will still be called and then Iterate() will be called just once.

Overrides:

Iterate in class Transform

Parameters:

pz - the complex value to be transformed

Returns:

the transformed value