README.md

HeatMap

Features

This library generates pixel images (png) from 2D-Grid values. You can setup a custom color spectrum for the interpolation.

Installation

Composer is used for installation. Add the following lines to your composer.json file:

"require": {
    "rabbl/heatmap": "^1.1"
}

Or install it on the command line: composer require rabbl/heatmap

Usage

$heatMap = new HeatMap();
$heatMap->setData(array(
    [0,1,2,3,5,6,7,8,9],
    [0,1,2,3,5,6,7,8,9],
    [0,1,2,3,5,6,7,8,9],
    [0,1,2,3,5,6,7,8,9],
    [0,1,2,3,5,6,7,8,9],
    [0,1,2,3,5,6,7,8,9]
));
$heatMap->setSpectrum('blue', 'green', 'yellow', 'red');
$fileName = $heatMap->createWithAbsoluteLimits($data, 0, 9);

Returns the temporary filename of the generated image.