common Class PixelCoordinate

Object common:Generic common:Transform common:UtilityTransform common:PixelCoordinate

class
UtilityTransform:PixelCoordinate

This is a utility transform which returns a pixel coordinate for a given complex number.

Ultra Fractal Source
class PixelCoordinate(UtilityTransform) {
; This is a utility transform which returns a pixel coordinate
; for a given complex number.

public:
func PixelCoordinate(Generic pparent)
UtilityTransform.UtilityTransform(pparent)

m_ScreenRelative = 0
m_SinAngle = sin(#angle)
m_CosAngle = cos(#angle)

if (#width*3 <= #height*4)
m_Distance = 4 / (#width*#magn)
else
m_Distance = 3 / (#height*#magn)
endif

endfunc

func Init(complex pz)
UtilityTransform.Init(pz)
endfunc

complex func Iterate(complex pz)
UtilityTransform.Iterate(pz)

float sx
float sy
complex cz

; note that in these calculations, we invert the y coordinate
; because Ultra Fractal reports #screenpixel with (0,0) in the
; upper left, not the lower left; complex numbers would place
; (0,0) in the lower left

if (m_Screenrelative == 1)              ; screen-relative coordinates
sx = real(pz) * #width
sy = (1 - imag(pz)) * #height

else                        ; normal coordinates
cz = (pz - #center) / m_Distance
sx = m_CosAngle*real(cz) + m_SinAngle*imag(cz)
sy = m_CosAngle*imag(cz) - m_SinAngle*real(cz)
sx = sx*#stretch + sy * tan(#skew)
sx = sx + #width/2
sy = -sy + #height/2
endif

return sx + flip(sy)
endfunc

; set screen-relative style
; 0 = none, 1 = normal (0,0) .. (1,1), 2 = image (-1,-1) .. (1,1)
func SetScreenRelative(int ptype)
m_ScreenRelative = ptype
endfunc

protected:
int m_ScreenRelative
float m_SinAngle
float m_CosAngle
float m_Distance

default:
title = "Pixel Coordinate utility class"

int param v_pixelcoordinate
caption = "Version (PixelCoordinate)"
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_pixelcoordinate < 100
endparam
}

Constructor Summary
PixelCoordinate()

PixelCoordinate(Generic pparent)

Method Summary
void Init(complex pz)
Set up for a sequence of values
complex Iterate(complex pz)
Transform a single point within a sequence
void SetScreenRelative(int ptype)
set screen-relative style 0 = none, 1 = normal (0,0) ..

Methods inherited from class common:Transform
IsSolid, IterateSilent

Methods inherited from class common:Generic
GetParent

Methods inherited from class Object

Constructor Detail

PixelCoordinate

public PixelCoordinate(Generic pparent)

PixelCoordinate

public PixelCoordinate()
Method Detail

Init

public void Init(complex pz)
Description copied from class: Transform
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). It will be called even if only one value is being transformed (e.g. a normal transformation formula). Use this to perform any setup that is exactly the same for each value in the sequence being transformed.

Overrides:
Init in class Transform
Parameters:
pz - the value representing the sequence; for a normal transformation formula use, this will be #pixel. In some cases this may differ from the first value passed to Iterate() if the calling code applies some other transformations.

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

SetScreenRelative

public void SetScreenRelative(int ptype)
set screen-relative style 0 = none, 1 = normal (0,0) .. (1,1), 2 = image (-1,-1) .. (1,1)