### looking for a linear programming library

Hi,
I'm working on a gui layout manager, I've read some articles about implementing gui layout using linear constraint, seems interesting, for example

eg1:
for a component has a fixed width and height,
 ``12`` `````` w = 30; h = 30;``````

eg2:
a window(width 300) contains two rect, the width of rect1 is twice than rect2
 ``12`` `````` w1 = 2 * w2; w1 + w2 = 300;``````

eg3:
a movie player keeps its width/height ratio as 16:9, and has a minimal width of 200
 ``12`` `````` w/h = 16/9; w >= 200;``````

Then the layout problem is transformed to solving these mathematical equation.
anyone has experience dealing with this problem? I'm looking for a library or some article about implementing one.

Thanks.

Its not exactly the answer to your question, but depending on your GUI framework you're using there exists some powerful layout manager:

Apple: Xcode has a very powerful and intuitive layout manager.
Qt: Qt Creator is also very powerful.

Hi, actually I'm implementing my own GUI framework and layout manager, the Xcode and Qt doesn't help.
The layout problem is equivalent to this problem:
 ``12345`` ``````x + y + z = 26 x - y = 1 2x + z - y = 18 how to get the result => x = 10, y = 9, z = 7``````
And there you may look for `int gsl_linalg_HH_solve (gsl_matrix * A, const gsl_vector * b, gsl_vector * x)`
Thanks, it doesn't support win32, I spent the last 10 minutes modifying #include path in every .h file, trying to get the hello world compile, but failed.. I'm giving up on this one..
From the INSTALL file:

 Hints for Microsoft Windows =========================== GSL should compile with GCC under Cygwin on Microsoft Windows. There is a gsl package in the standard Cygwin distribution which contains any patches needed. With Mingw/MSYS some floating point issues have been reported which cause failures in the monte/ test directory.

Maybe you want to install Cygwin or Mingw? It contains the most commonly used compiler suite with gcc. gcc is available on/for nearly all operating systems currently available.
Thanks but that's too complex to me, I'm looking for a win32 library.
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