OSL shader for spiral rotating an image

UV_rotate.osl

/*

Open shading Language shader that will take an image on a quad (eg blender) and rotate the image in a spiral that
is centered on the quad.

INPUT: in_UVs In Blender the script tag receives a UV input from a texture coordinate node 
       angle: the angle to rotate, can be animated in blender
OUTPUT: out_UVs modified UVs

*/




shader UV_rotate(
        
    point in_UVs = point(u, v, 0) 
    [[string label = "UVs In"]]  ,
    
    float angle =   359.0
    [[string label = "Angle"]]  ,
    
    output point out_UVs = 0
    [[string label = "UVs out"]]
    
    )
{

   
    
   
    // adjust the uvs to center
      out_UVs = point(in_UVs[0]-0.5,in_UVs[1]-0.5 ,0.0);  
     
      vector axis0 = point(-0.0,-0.0,0);
      vector axis1 = point(-0.0,-0.0,1);
      
    // compute the distance from the center
    
      float d = distance(out_UVs ,point(0,0,0));
    // further out more rotation     
      float Angrmp = (angle*(d));
      float rads = radians(Angrmp);
      point UVoffset = rotate(out_UVs, rads, axis0, axis1);
    // return the uvs to the corner
      UVoffset = point(UVoffset[0]+0.5,UVoffset[1]+0.5 ,0.0);
      out_UVs = UVoffset;
     
     
}