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<?php
/**
* Contains abstract class to hold relation preferences/statistics
*/
declare(strict_types=1);
namespace PhpMyAdmin\Plugins\Schema;
use function abs;
use function array_search;
use function min;
/**
* Relations preferences/statistics
*
* This class fetches the table master and foreign fields positions
* and helps in generating the Table references and then connects
* master table's master field to foreign table's foreign key.
*
* @abstract
*/
abstract class RelationStats
{
/** @var object */
protected $diagram;
/** @var mixed */
public $xSrc;
/** @var mixed */
public $ySrc;
/** @var int */
public $srcDir;
/** @var int */
public $destDir;
/** @var mixed */
public $xDest;
/** @var mixed */
public $yDest;
/** @var int */
public $wTick = 0;
/**
* @param object $diagram The diagram
* @param string $master_table The master table name
* @param string $master_field The relation field in the master table
* @param string $foreign_table The foreign table name
* @param string $foreign_field The relation field in the foreign table
*/
public function __construct(
$diagram,
$master_table,
$master_field,
$foreign_table,
$foreign_field
) {
$this->diagram = $diagram;
$src_pos = $this->getXy($master_table, $master_field);
$dest_pos = $this->getXy($foreign_table, $foreign_field);
/*
* [0] is x-left
* [1] is x-right
* [2] is y
*/
$src_left = $src_pos[0] - $this->wTick;
$src_right = $src_pos[1] + $this->wTick;
$dest_left = $dest_pos[0] - $this->wTick;
$dest_right = $dest_pos[1] + $this->wTick;
$d1 = abs($src_left - $dest_left);
$d2 = abs($src_right - $dest_left);
$d3 = abs($src_left - $dest_right);
$d4 = abs($src_right - $dest_right);
$d = min($d1, $d2, $d3, $d4);
if ($d == $d1) {
$this->xSrc = $src_pos[0];
$this->srcDir = -1;
$this->xDest = $dest_pos[0];
$this->destDir = -1;
} elseif ($d == $d2) {
$this->xSrc = $src_pos[1];
$this->srcDir = 1;
$this->xDest = $dest_pos[0];
$this->destDir = -1;
} elseif ($d == $d3) {
$this->xSrc = $src_pos[0];
$this->srcDir = -1;
$this->xDest = $dest_pos[1];
$this->destDir = 1;
} else {
$this->xSrc = $src_pos[1];
$this->srcDir = 1;
$this->xDest = $dest_pos[1];
$this->destDir = 1;
}
$this->ySrc = $src_pos[2];
$this->yDest = $dest_pos[2];
}
/**
* Gets arrows coordinates
*
* @param TableStats $table The table
* @param string $column The relation column name
*
* @return array Arrows coordinates
*/
private function getXy($table, $column)
{
$pos = array_search($column, $table->fields);
// x_left, x_right, y
return [
$table->x,
$table->x + $table->width,
$table->y + ($pos + 1.5) * $table->heightCell,
];
}
}
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