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Diffstat (limited to 'library/Icinga/Chart/Unit/LinearUnit.php')
| -rw-r--r-- | library/Icinga/Chart/Unit/LinearUnit.php | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/library/Icinga/Chart/Unit/LinearUnit.php b/library/Icinga/Chart/Unit/LinearUnit.php new file mode 100644 index 0000000..ea4792b --- /dev/null +++ b/library/Icinga/Chart/Unit/LinearUnit.php @@ -0,0 +1,227 @@ +<?php +/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */ + +namespace Icinga\Chart\Unit; + +/** + * Linear tick distribution over the axis + */ +class LinearUnit implements AxisUnit +{ + /** + * The minimum value to display + * + * @var int + */ + protected $min; + + /** + * The maximum value to display + * + * @var int + */ + protected $max; + + /** + * True when the minimum value is static and isn't affected by the dataset + * + * @var bool + */ + protected $staticMin = false; + + /** + * True when the maximum value is static and isn't affected by the dataset + * + * @var bool + */ + protected $staticMax = false; + + /** + * The number of ticks to use + * + * @var int + */ + protected $nrOfTicks = 10; + + /** + * The currently displayed tick + * + * @var int + */ + protected $currentTick = 0; + + /** + * The currently displayed value + * @var int + */ + protected $currentValue = 0; + + /** + * Create and initialize this AxisUnit + * + * @param int $nrOfTicks The number of ticks to use + */ + public function __construct($nrOfTicks = 10) + { + $this->min = PHP_INT_MAX; + $this->max = ~PHP_INT_MAX; + $this->nrOfTicks = $nrOfTicks; + } + + /** + * Add a dataset and calculate the minimum and maximum value for this AxisUnit + * + * @param array $dataset The dataset to add + * @param int $idx The idx (0 for x, 1 for y) + * + * @return $this Fluent interface + */ + public function addValues(array $dataset, $idx = 0) + { + $datapoints = array(); + + foreach ($dataset['data'] as $points) { + $datapoints[] = $points[$idx]; + } + if (empty($datapoints)) { + return $this; + } + sort($datapoints); + if (!$this->staticMax) { + $this->max = max($this->max, $datapoints[count($datapoints) - 1]); + } + if (!$this->staticMin) { + $this->min = min($this->min, $datapoints[0]); + } + $this->currentTick = 0; + $this->currentValue = $this->min; + if ($this->max === $this->min) { + $this->max = $this->min + 10; + } + $this->nrOfTicks = $this->max - $this->min; + return $this; + } + + /** + * Transform the absolute value to an axis relative value + * + * @param int $value The absolute coordinate from the dataset + * @return float|int The axis relative coordinate (between 0 and 100) + */ + public function transform($value) + { + if ($value < $this->min) { + return 0; + } elseif ($value > $this->max) { + return 100; + } else { + return 100 * ($value - $this->min) / $this->nrOfTicks; + } + } + + /** + * Return the position of the current tick + * + * @return int + */ + #[\ReturnTypeWillChange] + public function current() + { + return $this->currentTick; + } + + /** + * Calculate the next tick and tick value + */ + public function next(): void + { + $this->currentTick += (100 / $this->nrOfTicks); + $this->currentValue += (($this->max - $this->min) / $this->nrOfTicks); + } + + /** + * Return the label for the current tick + * + * @return string The label for the current tick + */ + #[\ReturnTypeWillChange] + public function key() + { + return (string) intval($this->currentValue); + } + + /** + * True when we're at a valid tick (iterator interface) + * + * @return bool + */ + public function valid(): bool + { + return $this->currentTick >= 0 && $this->currentTick <= 100; + } + + /** + * Reset the current tick and label value + */ + public function rewind(): void + { + $this->currentTick = 0; + $this->currentValue = $this->min; + } + + /** + * Set the axis maximum value to a fixed value + * + * @param int $max The new maximum value + */ + public function setMax($max) + { + if ($max !== null) { + $this->max = $max; + $this->staticMax = true; + } + } + + /** + * Set the axis minimum value to a fixed value + * + * @param int $min The new minimum value + */ + public function setMin($min) + { + if ($min !== null) { + $this->min = $min; + $this->staticMin = true; + } + } + + /** + * Return the current minimum value of the axis + * + * @return int The minimum set for this axis + */ + public function getMin() + { + return $this->min; + } + + /** + * Return the current maximum value of the axis + * + * @return int The maximum set for this axis + */ + public function getMax() + { + return $this->max; + } + + /** + * Get the amount of ticks necessary to display this AxisUnit + * + * @return int + */ + public function getTicks() + { + return $this->nrOfTicks; + } +} |