bug - dynamic plane is inverted

[Adam Majewski]

Hi,

I think that dynamic plane ( for julia sets ) is inverted  = upside down 

See :

;Position file automatically generated by XaoS 3.5

;  - a realtime interactive fractal zoomer

;Use xaos -load <filename> to display it

(initstate)

(palette 1 1191063399 0)

(formula 'mandel)

(juliaseed -0.11 0.6557)

(maxiter 1388)

(julia #t)

(view -0.1986 0.01201 2.757 2.757)

and compare to 

https://commons.wikimedia.org/wiki/File:Julia_set_for_fc(z)_%3D_z%5E2_-_0.110_%2B_0.6557i.png

It can be checked by coloring right upper quadrant  

  {  z : re(z)>0 and im(z)> 0  }

In my c programs I use : 

// Check Orientation of image : mark first quadrant 

// it should be in the upper right position

// uses global var :  ...

int CheckOrientation(unsigned char A[] )

{

  unsigned int ix, iy; // pixel coordinate 

  double Zx, Zy; //  Z= Zx+ZY*i;

  unsigned i; /* index of 1D array */

  for(iy=iyMin;iy<=iyMax;++iy) 

    {

      Zy = GiveZy(iy);

      for(ix=ixMin;ix<=ixMax;++ix) 

{

 // from screen to world coordinate 

 Zx = GiveZx(ix);

 i = Give_i(ix, iy); /* compute index of 1D array from indices of 2D array */

 if (Zx>0 && Zy>0) A[i]=255-A[i];   // check the orientation of Z-plane by marking first quadrant */

}

    }

   

  return 0;

}

 

Am I right ?

Adam

[Adam Majewski]

I'm lookin for the code when I can change it .