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<?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;
}
}
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