CODEWITHSUNDEEP
phpscale
Krimson
Krimson

Reputation: 7664

scaling a set of numbers down within boundaries

i dont know if this is the right place to ask this question but here it goes I am primarily working in php but an ans in any language will do.

i am making a tag cloud for a website. Something like this

lets say i have an array of numbers

array(54, 67, 68, 72, 98, 103, 112, 136, 169, 200, 201)

this numbers represent how many times a word has been searched for in the website.

in the tag cloud i want to display popular keywords in a bigger font size. So i want to use this numbers as a link to the font size

So my question is, how can i reduce these numbers relatively to each other so that all of them occur with the rage on 10 to 20. Where 10 and 20 will be the font size of the tags

I hope i was clear enough.

Upvotes: 0

Views: 402

Answers (2)

hafichuk
hafichuk

Reputation: 10781

Here is the fiddle.

<?php

$values = array(54, 67, 68, 72, 98, 103, 112, 136, 169, 200, 201);

$max = max($values);
$min = min($values);

$fontMin = 10;
$fontMax = 20;

$valueDiff = $max - $min;
$fontDiff = $fontMax - $fontMin;
$incrementEvery = round($valueDiff / $fontDiff);

foreach ($values as $value) {
    $actualFont = round(($value - $min) / $incrementEvery) + $fontMin;
    echo "$value: $actualFont \n";
}

Results in:

54: 10 
67: 11 
68: 11 
72: 11 
98: 13 
103: 13 
112: 14 
136: 15 
169: 18 
200: 20 
201: 20

The one-liner is:

round(($value - $min) / round(($max - $min) / ($fontMax - $fontMin))) + $fontMin;

Upvotes: 3

Jack
Jack

Reputation: 1376

You can sort the array using the php function sort() [http://php.net/manual/en/function.sort.php] to get the difference between the highest and lowest numbers. For example, in your list 201 is the highest and 54 is the lowest giving you a difference of 147. Since you want between 10 and 20 inclusively, you have 10 different font sizes to use (or more if you use decimals) so you can divide 147 by 10 to determine how many items over the minimum you will need to increase the font-size by 1 point.

So, 54 would be 10 point font and 68 would be 11 point font (54 + 14.7 = 68.7). If you want to use whole numbers, simply use PHP floor().

Hope this gives you a good idea of how to solve the problem.

Upvotes: 1

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