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<?php |
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namespace Graze\CiffRenderer\Renderer\FieldRenderer; |
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use Graze\CiffRenderer\Renderer\FieldRenderer\FieldRendererInterface; |
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use Graze\CiffRenderer\Parser\FieldParser\FieldParserInterface; |
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use Intervention\Image\ImageManager; |
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use Intervention\Image\Gd\Font; |
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class FieldRendererFixedText implements FieldRendererInterface |
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{ |
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/** |
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* @var float |
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*/ |
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const LETTER_SPACING_ADJUSTMENT = 0.97; |
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/** |
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* @var Font |
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*/ |
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private $font; |
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/** |
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* @param Font $font |
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*/ |
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public function __construct(Font $font) |
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{ |
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$this->font = $font; |
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} |
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/** |
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* @param ImageManager $imageManager |
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* @param FieldParserInterface $parser |
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* @param null|callable $fontResolver |
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* @param null|callable $graphicResolver |
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* @return \Intervention\Image\Image |
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*/ |
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public function render( |
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ImageManager $imageManager, |
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FieldParserInterface $parser, |
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callable $fontResolver = null, |
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callable $graphicResolver = null |
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) { |
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$fontPath = $fontResolver($parser->getFontFace()); |
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// split text into lines |
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$lines = explode("\n", $parser->getText()); |
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$texts = []; |
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$width = 0; |
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$height = 0; |
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foreach ($lines as $line) { |
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$text = $this->renderLine($imageManager, $parser, $fontPath, $line); |
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if (is_null($text)) { |
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continue; |
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} |
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// store dimensions ready to create a canvas |
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$width = max($width, $text->getWidth()); |
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$height += $text->getHeight(); |
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$texts[] = $text; |
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} |
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if (empty($texts)) { |
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// nothing to render |
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return null; |
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} |
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// create a canvas to add each line of text to |
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$canvas = $imageManager->canvas($width, $height); |
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$offsetX = 0; |
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$offsetY = 0; |
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foreach ($texts as $text) { |
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// add the text to the canvas |
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$canvas->insert($text, 'top-left', (int) $offsetX, (int) $offsetY); |
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// increase the offset for the next line |
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$offsetY += $text->getHeight(); |
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} |
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$orientation = $parser->getOrientation(); |
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if ($orientation) { |
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$canvas->rotate(360 - $orientation); |
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} |
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return $canvas; |
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} |
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/** |
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* @param ImageManager $imageManager |
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* @param FieldParserInterface $parser |
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* @param string $fontPath |
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* @param string $text |
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* @return \Intervention\Image\Image |
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*/ |
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private function renderLine(ImageManager $imageManager, FieldParserInterface $parser, $fontPath, $text) |
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{ |
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// create the text here so it can be measured |
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$this->font->text($text); |
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$this->font->file($fontPath); |
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$this->font->size($parser->getFontSize()); |
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$this->font->color('#000'); |
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$this->font->valign('top'); |
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$size = $this->font->getBoxSize(); |
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// if text consists of invisible chars, measured size will be zero, nothing to print |
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if ($size['width'] < 1 || $size['height'] < 1) { |
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return null; |
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} |
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$fontCallback = function (&$font) { |
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// override the font created by Canvas::text() |
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$font = $this->font; |
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}; |
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$canvas = $imageManager->canvas($size['width'], $size['height']); |
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// no need to pass the text in here as we override the font in the callback |
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$canvas->text('', null, null, $fontCallback); |
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$width = (int) round($size['width'] * self::LETTER_SPACING_ADJUSTMENT); |
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$canvas->resize($width, $size['height']); |
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return $canvas; |
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} |
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/** |
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* @return FieldRendererInterface |
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*/ |
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public static function factory() |
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{ |
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return new static( |
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new Font() |
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); |
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} |
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} |
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graze /
ciff-renderer
