Added a basic text to PDF renderer.

src/Services/LabelSystem/LabelGenerator.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Services\LabelSystem;
+
+
+use App\Entity\Contracts\NamedElementInterface;
+use App\Entity\LabelSystem\LabelOptions;
+use App\Entity\Parts\Part;
+use App\Services\ElementTypeNameGenerator;
+use Dompdf\Dompdf;
+use Twig\Environment;
+
+class LabelGenerator
+{
+    protected const CLASS_SUPPORT_MAPPING = [
+        'part' => Part::class,
+    ];
+
+    public const MM_TO_POINTS_FACTOR = 2.83465;
+
+    protected $labelHTMLGenerator;
+
+    public function __construct(LabelHTMLGenerator $labelHTMLGenerator)
+    {
+        $this->labelHTMLGenerator = $labelHTMLGenerator;
+    }
+
+    public function generateLabel(LabelOptions $options, object $element): string
+    {
+        if (!$this->supports($options, $element)) {
+            throw new \InvalidArgumentException('The given options are not compatible with the given element!');
+        }
+
+        $dompdf = new Dompdf();
+        $dompdf->loadHtml($this->labelHTMLGenerator->getLabelHTML($options, $element));
+
+        $dompdf->setPaper($this->mmToPointsArray($options->getWidth(), $options->getHeight()));
+
+        $dompdf->render();
+        return $dompdf->output();
+    }
+
+    /**
+     * Check if the given LabelOptions can be used with $element.
+     * @param  LabelOptions  $options
+     * @param  object  $element
+     * @return bool
+     */
+    public function supports(LabelOptions $options, object $element)
+    {
+        $supported_type = $options->getSupportedElement();
+        if (!isset(static::CLASS_SUPPORT_MAPPING[$supported_type])) {
+            throw new \InvalidArgumentException('Supported type name of the Label options not known!');
+        }
+
+        return is_a($element, static::CLASS_SUPPORT_MAPPING[$supported_type]);
+    }
+
+    public function mmToPointsArray(float $width, float $height): array
+    {
+        return [0, 0, $width * self::MM_TO_POINTS_FACTOR, $height * self::MM_TO_POINTS_FACTOR];
+    }
+}