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Full Discussion: How to get data only inside polygon created by points which is part of whole data from file?
Top Forums UNIX for Dummies Questions & Answers How to get data only inside polygon created by points which is part of whole data from file? Post 302411786 by Corona688 on Friday 9th of April 2010 12:41:36 PM
Old 04-09-2010
Quote:
Originally Posted by reva
Ya i agree with you..Its not simple problem...
consider it as just X & Y cooridnates & tel me..
Just did I thought... what do you want to know?
Quote:
Thats what i am asking you how to loop through the list of my edges...I am not getting it..
Okay. You have a list of points:
Code:
29.45, 89.43
32.47, 90.98
27.25, 95.63
27.29, 98.27
36.74, 96.32
31.90, 87.67
29.45, 89.43

Convert it to a list of lines, where line A is [ point 1 ] , [ point 2] and line B is [ point 2 ], [ point 3 ] and the last is [ point n ], [ point 1 ]

Code:
[ 29.45, 89.43 ], [ 32.47, 90.98 ]
[ 32.47, 90.98 ], [ 27.25, 95.63 ]
[ 27.25, 95.63 ], [ 27.29, 98.27 ]
[ 27.29, 98.27 ], [ 36.74, 96.32 ]
[ 36.74, 96.32 ], [ 31.90, 87.67 ]
[ 31.90, 87.67 ], [ 29.45, 89.43 ]
[ 29.45, 89.43 ], [ 29.45, 89.43 ]

Quote:
at least can you tel me that part of code..Smilie
I don't know of an off-the-shelf solution offhand, and you can google as well as I can, so I figured you wanted to know how to build one. There's some interesting looking perl modules that may help you, particularly this one's polygon_contains_point function.

---------- Post updated at 10:41 AM ---------- Previous update was at 09:53 AM ----------

Code:
#!/usr/bin/perl

use Math::Polygon::Calc;

my @poly = (    [       0,      0       ],
                [       10,     0       ],
                [       10,     10      ],
                [       0,      0       ]       );

if(polygon_contains_point([9, 1], @poly))
{
        print "Point is inside\n";
}
else
{
        print "Point is not inside\n";
}

exit 0;

you'll of course need to install the Math::Polycon::Calc CPAN module. You can do that by running the interactive 'cpan' program as root. Once it's done configuring itself, tell it 'install Math::Polygon::Calc' and it'll do so. Then 'quit' and it'll do so.
 

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LEARN ABOUT SUSE

math::bigint::fastcalc

Math::BigInt::FastCalc(3pm)				 Perl Programmers Reference Guide			       Math::BigInt::FastCalc(3pm)

NAME

       Math::BigInt::FastCalc - Math::BigInt::Calc with some XS for more speed

SYNOPSIS

       Provides support for big integer calculations. Not intended to be used by other modules. Other modules which sport the same functions can
       also be used to support Math::BigInt, like Math::BigInt::GMP or Math::BigInt::Pari.

DESCRIPTION

       In order to allow for multiple big integer libraries, Math::BigInt was rewritten to use library modules for core math routines. Any module
       which follows the same API as this can be used instead by using the following:

	       use Math::BigInt lib => 'libname';

       'libname' is either the long name ('Math::BigInt::Pari'), or only the short version like 'Pari'. To use this library:

	       use Math::BigInt lib => 'FastCalc';

       Note that from Math::BigInt v1.76 onwards, FastCalc will be loaded automatically, if possible.

STORAGE

       FastCalc works exactly like Calc, in stores the numbers in decimal form, chopped into parts.

METHODS

       The following functions are now implemented in FastCalc.xs:

	       _is_odd	       _is_even        _is_one	       _is_zero
	       _is_two	       _is_ten
	       _zero	       _one	       _two	       _ten
	       _acmp	       _len	       _num
	       _inc	       _dec
	       __strip_zeros   _copy

LICENSE

       This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

AUTHORS

       Original math code by Mark Biggar, rewritten by Tels <http://bloodgate.com/> in late 2000.  Seperated from BigInt and shaped API with the
       help of John Peacock.  Fixed, sped-up and enhanced by Tels http://bloodgate.com 2001-2003.  Further streamlining (api_version 1 etc.) by
       Tels 2004-2007.

SEE ALSO

       Math::BigInt, Math::BigFloat, Math::BigInt::GMP, Math::BigInt::FastCalc and Math::BigInt::Pari.

perl v5.12.1							    2010-04-26					       Math::BigInt::FastCalc(3pm)
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