summaryrefslogtreecommitdiffstats
path: root/library/Icinga/Chart/Unit/CalendarUnit.php
blob: 7ce6a994d19156776c06686d3b0face050483e51 (plain)
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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
<?php
/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */


namespace Icinga\Chart\Unit;

use DateTime;

/**
 * Calendar Axis Unit that transforms timestamps into user-readable values
 *
 */
class CalendarUnit extends LinearUnit
{
    /**
     * Constant for a minute
     */
    const MINUTE    = 60;

    /**
     * Constant for an hour
     */
    const HOUR      = 3600;

    /**
     * Constant for a day
     */
    const DAY       = 864000;

    /**
     * Constant for ~a month
     * 30 Days, this is sufficient for our needs
     */
    const MONTH     = 2592000; // x

    /**
     * An array containing all labels that will be displayed
     *
     * @var array
     */
    private $labels = array();

    /**
     * The date format to use
     *
     * @var string
     */
    private $dateFormat = 'd-m';

    /**
     * The time format to use
     *
     * @var string
     */
    private $timeFormat = 'g:i:s';

    /**
     * Create the labels for the given dataset
     */
    private function createLabels()
    {
        $this->labels = array();
        $duration = $this->getMax() - $this->getMin();

        if ($duration <= self::HOUR) {
            $unit = self::MINUTE;
        } elseif ($duration <= self::DAY) {
            $unit = self::HOUR;
        } elseif ($duration <= self::MONTH) {
            $unit = self::DAY;
        } else {
            $unit = self::MONTH;
        }
        $this->calculateLabels($unit);
    }

    /**
     * Calculate the labels for this dataset
     *
     * @param integer $unit The unit to use as the basis for calculation
     */
    private function calculateLabels($unit)
    {
        $fac = new DateTime();

        $duration = $this->getMax() - $this->getMin();

        // Calculate number of ticks, but not more than 30
        $tickCount = ($duration/$unit * 10);
        if ($tickCount > 30) {
            $tickCount = 30;
        }

        $step = $duration / $tickCount;
        $format = $this->timeFormat;
        if ($unit === self::DAY) {
            $format = $this->dateFormat;
        } elseif ($unit === self::MONTH) {
            $format = $this->dateFormat;
        }

        for ($i = 0; $i <= $duration; $i += $step) {
            $this->labels[] = $fac->setTimestamp($this->getMin() + $i)->format($format);
        }
    }

    /**
     * Add a dataset to this CalendarUnit and update labels
     *
     * @param   array   $dataset    The dataset to update
     * @param   int     $idx        The index to use for determining the data
     *
     * @return  $this                Fluid interface
     */
    public function addValues(array $dataset, $idx = 0)
    {
        parent::addValues($dataset, $idx);
        $this->createLabels();
        return $this;
    }

    /**
     * Return the current axis relative position
     *
     * @return int The position of the next tick (between 0 and 100)
     */
    public function current()
    {
        return 100 * (key($this->labels) / count($this->labels));
    }

    /**
     * Move to next tick
     */
    public function next()
    {
        next($this->labels);
    }

    /**
     * Return the current tick caption
     *
     * @return string
     */
    public function key()
    {
        return current($this->labels);
    }

    /**
     * Return true when the iterator is in a valid range
     *
     * @return bool
     */
    public function valid()
    {
        return current($this->labels) !== false;
    }

    /**
     * Rewind the internal array
     */
    public function rewind()
    {
        reset($this->labels);
    }
}