graze / ciff-renderer

src/Renderer/FieldRenderer/FieldRendererFixedText.php

<?php

namespace Graze\CiffRenderer\Renderer\FieldRenderer;

use Graze\CiffRenderer\Renderer\FieldRenderer\FieldRendererInterface;
use Graze\CiffRenderer\Parser\FieldParser\FieldParserInterface;
use Graze\CiffRenderer\Parser\FieldParser\FieldParserFixedText;
use Intervention\Image\ImageManager;
use Intervention\Image\Gd\Font;

class FieldRendererFixedText implements FieldRendererInterface
{
    /**
     * @var float
     */
    const LETTER_SPACING_ADJUSTMENT = 0.97;

    /**
     * @var Font
     */
    private $font;

    /**
     * @param Font $font
     */
    public function __construct(Font $font)
    {
        $this->font = $font;
    }

    /**
     * @param ImageManager $imageManager
     * @param FieldParserInterface $parser
     * @param null|callable $fontResolver
     * @param null|callable $graphicResolver
     * @return \Intervention\Image\Image
     */
    public function render(
        ImageManager $imageManager,
        FieldParserInterface $parser,
        callable $fontResolver = null,
        callable $graphicResolver = null
    ) {
        $fontPath = $fontResolver($parser->getFontFace());

        // split text into lines
        $lines = explode("\n", $parser->getText());
        $texts = [];
        $width = 0;
        $height = 0;
        foreach ($lines as $line) {
            $text = $this->renderLine($imageManager, $parser, $fontPath, $line);
            if (is_null($text)) {
                continue;
            }

            // store dimensions ready to create a canvas
            $width = max($width, $text->getWidth());
            $height += $text->getHeight();

            $texts[] = $text;
        }

        if (empty($texts)) {
            // nothing to render
            return null;
        }

        // create a canvas to add each line of text to
        $canvas = $imageManager->canvas($width, $height);

        $offsetX = 0;
        $offsetY = 0;
        foreach ($texts as $text) {
            // add the text to the canvas
            $canvas->insert($text, 'top-left', (int) $offsetX, (int) $offsetY);

            // increase the offset for the next line
            $offsetY += $text->getHeight();
        }

        $orientation = $parser->getOrientation();
        if ($orientation) {
            $canvas->rotate(360 - $orientation);
        }

        return $canvas;
    }

    /**
     * @param ImageManager $imageManager
     * @param FieldParserInterface $parser
     * @param string $fontPath
     * @param string $text
     * @return \Intervention\Image\Image
     */
    private function renderLine(ImageManager $imageManager, FieldParserInterface $parser, $fontPath, $text)
    {
        // create the text here so it can be measured
        $this->font->text($text);

        $this->font->file($fontPath);
        $this->font->size($parser->getFontSize());
        $this->font->color('#000');
        $this->font->align($parser->getTextAlignment());
        $this->font->valign('top');

        $size = $this->font->getBoxSize();

        // if text consists of invisible chars, measured size will be zero, nothing to print
        if ($size['width'] < 1 || $size['height'] < 1) {
            return null;
        }

        $fontCallback = function (&$font) {
            // override the font created by Canvas::text()
            $font = $this->font;
        };

        $canvas = $imageManager->canvas($size['width'], $size['height']);

        // figure out the correct reference point for this alignment
        switch ($parser->getTextAlignment()) {
            case FieldParserFixedText::ALIGN_CENTRE:
                $posX = round($parser->getWidth()/2);
                break;

            case FieldParserFixedText::ALIGN_RIGHT:
                $posX = $parser->getWidth();
                break;

            default:
                $posX = 0;
                break;
        }

        // no need to pass the text in here as we override the font in the callback
        $canvas->text('', $posX, 0, $fontCallback);

It seems like $posX can also be of type double; however, parameter $x of Intervention\Image\Image::text() does only seem to accept integer, maybe add an additional type check?

        // attempt to correct differences between this and Clarisoft
        $width = (int) round($size['width'] * self::LETTER_SPACING_ADJUSTMENT);
        $canvas->resize($width, $size['height']);

        return $canvas;
    }

    /**
     * @return FieldRendererInterface
     */
    public static function factory()
    {
        return new static(
            new Font()
        );
    }
}