algorithm - Packing rectangles for compact representation -

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i looking pointers solution of following problem: have set of rectangles, height known , x-positions , want pack them in more compact form. little drawing (where rectangles of same width, width may vary in real life), like, instead of. 

-r1-   -r2--      -r3--        -r4-         -r5--

something like.

-r1-  -r3--    -r2-- -r4-          -r5--

all hints appreciated. not looking "the" best solution.

your problem simpler variant, might tips reading heuristics developed "binpacking" problem. there has been lot written this, this page start.


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