1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
<?php
/*******************************************************************************
Bicicleta
Copyright 2008 Joseba García Etxebarria
Licensed under The MIT License
Redistributions of files must retain the above copyright notice.
Gets in charge of displaying a bar graphic with the information passed as
a GET argument. Also, the arithmetic mean of all the values is computed
and displayed in the background.
Graphs are cached.
Several parameters can be changed in the includes/config.php file.
Be advised that I'll change to a better system than base64_encoding sooner
than latter.
*******************************************************************************/
require_once("includes/config.php");
# Define values
$height = 100 * $pixelheight + $border;
# Get the values passed in the data array
$data = unserialize(base64_decode($_GET["data"]));
if(! is_array($data)) {
return FALSE;
}
$n = count($data, 0);
# Check if the image is cached
# We md5sum it so we don't get a too long filename
$graph_id = md5($_GET['data']);
$location = $graph_cache.$graph_id;
if(! file_exists($location)) {
$values = array(); $legend = array();
for($i = 0; $i < $n; $i++) {
$values[] = $data[$i]["value"];
$legends[] = $data[$i]["text"];
}
$max = max($values);
if($n <= 0 || $max <= 0) { # UPS!
return FALSE;
}
$mean = array_sum($values) * 100. * $pixelheight / ($n * $max) ;
$width = ($n+1)*$border + $n*$barwidth;
$img = imagecreatetruecolor($width, $height);
$bordercolor = imagecolorallocate($img, 150, 150, 150);
$meancolor = imagecolorallocate($img, 225, 237, 255);
$bgcolor = imagecolorallocate($img, 255, 255, 255);
$barcolor = imagecolorallocate($img, 150, 192, 255);
$textcolor = imagecolorallocate($img, 155, 155, 155);
# Draw the white background and the outer frame
imagefilledrectangle($img, 0, 0, $width-1, $height-1,
$bgcolor); # White background
imagefilledrectangle($img, 0, $height-$mean, $width-1,
$height-1, $meancolor); # Display mean
imagerectangle($img, 0, 0, $width-1, $height-1, $bordercolor); # Frame
# Draw the bars
$x = $border;
for($i=0; $i<$n; $i++) {
imagefilledrectangle($img, $x, $height-($values[$i]*100.*$pixelheight/$max),
$x + $barwidth, $height - 2, $barcolor);
imagefttext($img, $bargraph_fontsize, 90., $x+$barwidth/2+$bargraph_fontsize/2, $height-$border, $textcolor,
"/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf", $values[$i]."Km. on ".$legends[$i]);
$x += $barwidth + $border;
}
# Cache image and display it
imagepng($img, $location);
imagedestroy($img);
}
header("Content-type: image/png");
readfile($location);
?>
|