Readme.txt

spc-alert.php

Requirements
----
PHP with GD library
Bootstrap.min.css (optional)


Usage
----
Change $lat and $lon with the pixel coordinates of your location (refer to http://www.spc.noaa.gov/products/outlook/imgs/cities.gif) (currently set to Atlanta, Georgia) 

Load spc-alert.php in your browser

Testing
----
Replace the $im url with http://www.spc.noaa.gov/products/outlook/archive/2011/day1otlk_v_20110426_2000.gif and update $lat/$lon accordingly

TODO
----
- Update $category arithmetic to handle warning polygon borders falling on $lat and $lon
- Set $lat and $lon via GET //Which defaults though?

spc-alert.php

<link href="bootstrap.min.css" rel="stylesheet">

<div class="container">
<?php

date_default_timezone_set('Europe/London');

$curr = date('Hi');

//echo "$curr <br>";

if ($curr > 0600) {
	$time = '0600';
	
	if ($curr > 1300) {
		$time = '1300';
		
		if ($curr > 1630) {
			$time = '1630';

				if ($curr > 2000) {
					$time = '2000';

					if ($curr > 0100) {
						$time = '0100';
					}
				}
			}
		}
	}

//echo $time;

$lat = 621;
$lon = 339;

$im = imagecreatefromgif("http://spc.noaa.gov/products/outlook/day1otlk_$time.gif");
$rgb = imagecolorat($im, $lat, $lon);

$colors = imagecolorsforindex($im, $rgb);

//var_export($colors);

/* echo '<style>body{background: rgb('.$colors['red'].' ,'.$colors['green'].', '.$colors['blue'].');}</style>'; */

$category = $colors['red'] + $colors['green'] + $colors['blue'];

//echo $category;

switch ($category) {
		
	case 484: //Red
		echo '<div class="alert" style="background: #e67f7f; border: 1px solid #cd0000; color: #cd0000;">Moderate risk of severe weather</div>';
		break;

	case 616: //Green
		echo '<div class="alert" style="background: #c0e8c0; border: 1px solid #3c783c; color: #3c783c;">Thunderstorms possible</div>';
		break;
		
	case 619: //Yellow
		echo '<div class="alert" style="background: #f6f67f; border: 1px solid #ff9600; color: #ff9600;">Slight chance of severe weather</div>';
		break;

	case 637: //Pink
		echo '<div class="alert" style="background: #ff7fff; border: 1px solid #a348a3; color: #a348a3;">Extremely high risk of severe weather</div>';
		break;	
	
	case 735: //White
		echo '<div class="alert" style="background: white; border: 1px solid black; color: black;">No severe weather threat at this time </div>';
		break;		
}

?>
</div>