http://qs1969.pair.com?node_id=129865

in reply to Fabric calculator - a better way to do it?

This is me just being a monkey and testing the script out:
```F:\dev>perl fabric.pl
How many fabrics are you using?
2
How wide is fabric 1?
1
To be safe, we'll use a width of -1 for fabric 1.
How many different shapes of fabric 1 is a block made of?
1
What is the width of shape 1?
1
What is the height of shape 1?
2
Shape dimensions:
The dimensions of shape 1 are 1x2
You can get 0 piece(s) of shape 1 per
1" strip of fabric 1.
You can get 36 1" strips per yard.
You can get 0 of shape 1 per yard of
-1" of fabric 1.
How many of shape 1 do you need per block?
23
You need 23 per block.
How many blocks are you making?
2
You are making 2 blocks.
You need 46 of shape 1.
Illegal division by zero at fabric.pl line 88, <STDIN> line 7.

F:\dev>
I'll update this node after I've messed with the code.

My monkeying around immediately proves insightful into how you can improve this (at least it appears so to me).

A good strategy might be to turn this into a module, and then, write "interfaces" for it, like commandline, CGI, GUI. All I have to say at this point is, not bad quiltmaker (some of your math may be funny, but useful to real people and immensly perlmonkish -- no prog/perl bg, good practices at the beginning). I see sanity checks, units of measurement conversions, price estimation.... ;D

update:

```#!/usr/bin/perl -w
use strict;

# How many fabrics are you using?

my \$number_of_fabrics;

print "How many fabrics are you using? \n";

chomp(\$number_of_fabrics = <STDIN>);

\$number_of_fabrics =~ s/\D//; # only allow number input

## \$number_of_fabrics ||= 3;  # assume default quietly

unless(\$number_of_fabrics and \$number_of_fabrics >=3 )
{
warn "Ahem!!! You must enter a NUMBER >= 3, but that's ok, default
+ is 3";
\$number_of_fabrics = 3;
}
#... more to come ... ;D

___crazyinsomniac_______________________________________
Disclaimer: Don't blame. It came from inside the void

perl -e "\$q=\$_;map({chr unpack qq;H*;,\$_}split(q;;,q*H*));print;\$q/\$q;"

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Re: (crazyinsomniac:) Re: Fabric calculator - a better way to do it?
by ailie (Friar) on Dec 06, 2001 at 12:19 UTC

Wow. It never even occurred to me to put in widths like that, since quilting fabric is almost always 45" wide, sometimes 60" wide - certainly not 1" wide. Of course, now I'm going "D'oh!"

The math is inelegant, but that's a basic fact of calculating fabric yardages for quilts. Simple math, but annoying.

I like the module idea. Of course, I have no idea how to go about such a thing, but learning is really the whole point.

Price estimation is simple:
print "No, you may not buy more fabric. \n";