I need to define function (in pstricks mode) for drawing lines. Function should work like this:
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\def\newhline(#1,#2){#3}{\psline(#1,#2)(#1+#3,#2)
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Of course this function doesn't work.
How can I define this function? If I needed only integer values of #1 and #3, I would do it by counters, for example:
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\newcounter{nhlc}
\def\newhline(#1,#2){#3}{\setcounter{nhlc}{#1}\stepcounter{nhlc}{#3}
\psline(#1,#2)(\thenhlc,#2)}
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But the problem is, that I need #1 and #3 in real (e.g. #1=1.2 and #3=4.3).
The second definition doesn't work for it.

Is some way to define function for calculation #1+#3?