Xjyuk

I need to shift some scope environment according to polar variables not xshift and yshift. Assuming that this feature is not already implemented (is it?!) and I am not reinventing a wheel, I thought that would be a good opportunity to wrestle with pgf stuffs to do it myself.

Here is what I've tried:

documentclass[tikz]standalone
usepackagegraphicx
usepackagepgf

newcommandobject
 draw[fill=red] (0,0) rectangle ++(2,2);


newcommandpolarshift[2]
 xshift = pgfmathparsemultiply(#1,cos(#2))
 yshift = pgfmathparsemultiply(#1,sin(#2))


begindocument
 begintikzpicture
 object;
 beginscope[polarshift6030]
 object;
 endscope
 endtikzpicture
enddocument

But LaTeX compalains like: Incomplete iffalse.

What is the problem with this snippet?

This is an attempt to convince you to make things more TikZy. Instead of a macro object it is arguably better to define a pic object. Then the shift is just the (relative) coordinate of the pic:

documentclass[tikz]standalone

begindocument
begintikzpicture[pics/object/.style=
 code=draw[fill=red] (0,0) rectangle ++(2,2);]
 path picobject (30:60pt) picobject ;
endtikzpicture
enddocument

As you see, the code becomes much shorter. And it is easier to customize things:

documentclass[tikz]standalone

begindocument
begintikzpicture[pics/object/.style=
 code=draw[fill=red,pic actions] (0,0) rectangle ++(2,2);]
 path picobject (30:60pt) pic[rotate=30,scale=1.2,dashed,draw=blue]object ;
endtikzpicture
enddocument

ADDENDUM: as for your comment: of course, your approach can be made work, too. First of all, TikZ automatically parses these expressions, so there is no need to say pgfmathparse. Other than that you are missing a comma, and you need to expand the macro.

documentclass[tikz]standalone
%usepackagegraphicx %<-loaded by tikz
%usepackagepgf% <- loaded by tikz

newcommandobject
 draw[fill=red] (0,0) rectangle ++(2,2);


newcommandpolarshift[2]
 xshift =#1*cos(#2),
 yshift =#1*sin(#2)


begindocument
 begintikzpicture
 object;
 beginscope[style/.expanded=polarshift6030]
 object;
 endscope
 endtikzpicture
enddocument

It seems that commands can't be used as option of scope. Try the following:

documentclass[tikz, margin=3mm]standalone
usepackagegraphicx
usepackagepgf

newcommandobject
 draw[fill=red] (0,0) rectangle ++(2,2);

tikzsetpolarshift/.style args=#1/#2xshift=#1*cos(#2),yshift=#1*sin(#2)

begindocument
 begintikzpicture
 object;
 beginscope[polarshift=60/30]
 object;
 endscope
 endtikzpicture
enddocument

If I understood your problem correctly, just shift it to a polar coordinate:

beginscope[shift=(30:2)]

documentclass[tikz]standalone
usepackagegraphicx
usepackagepgf

newcommandobject
 draw[fill=red] (0,0) rectangle ++(2,2);


%newcommandpolarshift[2]
% xshift = pgfmathparsemultiply(#1,cos(#2))
% yshift = pgfmathparsemultiply(#1,sin(#2))
%

begindocument
 begintikzpicture
 object;
 beginscope[shift=(30:2)]
 object;
 endscope
 endtikzpicture
enddocument