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<?php |
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/* |
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* This file is part of the 2amigos/qrcode-library project. |
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* |
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* (c) 2amigOS! <http://2amigos.us/> |
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* |
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* For the full copyright and license information, please view |
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* the LICENSE file that was distributed with this source code. |
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*/ |
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namespace Da\QrCode\Traits; |
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use BaconQrCode\Renderer\Image\Png; |
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use BaconQrCode\Writer; |
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use Da\QrCode\Contracts\LabelInterface; |
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use Da\QrCode\Contracts\QrCodeInterface; |
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use Da\QrCode\Exception\BadMethodCallException; |
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use Da\QrCode\Exception\ValidationException; |
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use Da\QrCode\Renderer\Jpg; |
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use Zxing\QrReader; |
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trait ImageTrait |
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{ |
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protected $validate = false; |
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/** |
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* Whether to validate result or not. |
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* |
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* @param bool $validate |
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* |
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* @return $this |
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*/ |
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public function validateResult(bool $validate): self |
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{ |
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$this->validate = $validate; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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* @throws ValidationException |
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* @throws BadMethodCallException |
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*/ |
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public function writeString(QrCodeInterface $qrCode): string |
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{ |
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/** @var Png|Jpg $renderer */ |
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$renderer = $this->renderer; |
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$renderer->setWidth($qrCode->getSize()); |
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$renderer->setHeight($qrCode->getSize()); |
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$renderer->setMargin(0); |
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$renderer->setForegroundColor($this->convertColor($qrCode->getForegroundColor())); |
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$renderer->setBackgroundColor($this->convertColor($qrCode->getBackgroundColor())); |
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$writer = new Writer($renderer); |
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$string = $writer->writeString( |
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$qrCode->getText(), |
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$qrCode->getEncoding(), |
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$this->convertErrorCorrectionLevel($qrCode->getErrorCorrectionLevel()) |
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); |
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$image = imagecreatefromstring($string); |
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$image = $this->addMargin( |
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$image, |
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$qrCode->getMargin(), |
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$qrCode->getSize(), |
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$qrCode->getForegroundColor(), |
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$qrCode->getBackgroundColor() |
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); |
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if ($qrCode->getLogoPath()) { |
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$image = $this->addLogo($image, $qrCode->getLogoPath(), $qrCode->getLogoWidth()); |
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} |
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if ($qrCode->getLabel()) { |
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$image = $this->addLabel( |
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$image, |
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$qrCode->getLabel(), |
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$qrCode->getForegroundColor(), |
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$qrCode->getBackgroundColor() |
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); |
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} |
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$string = $this->imageToString($image); |
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if ($this->validate) { |
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$reader = new QrReader($string, QrReader::SOURCE_TYPE_BLOB); |
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if ($reader->text() !== $qrCode->getText()) { |
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throw new ValidationException( |
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sprintf( |
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'Built-in validation reader read "%s" instead of "%s"' . |
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'Adjust your parameters to increase readability or disable built-in validation.', |
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$reader->text(), |
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$qrCode->getText() |
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) |
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); |
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} |
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} |
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return $string; |
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} |
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/** |
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* @param resource $sourceImage |
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* @param int $margin |
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* @param int $size |
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* @param int[] $foregroundColor |
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* @param int[] $backgroundColor |
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* |
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* @return resource |
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*/ |
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protected function addMargin($sourceImage, $margin, $size, array $foregroundColor, array $backgroundColor) |
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{ |
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$additionalWhitespace = $this->calculateAdditionalWhiteSpace($sourceImage, $foregroundColor); |
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if ($additionalWhitespace === 0 && $margin === 0) { |
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return $sourceImage; |
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} |
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$targetImage = imagecreatetruecolor($size + $margin * 2, $size + $margin * 2); |
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$backgroundColor = imagecolorallocate( |
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$targetImage, |
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$backgroundColor['r'], |
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$backgroundColor['g'], |
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$backgroundColor['b'] |
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); |
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imagefill($targetImage, 0, 0, $backgroundColor); |
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imagecopyresampled( |
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$targetImage, |
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$sourceImage, |
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$margin, |
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$margin, |
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$additionalWhitespace, |
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$additionalWhitespace, |
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$size, |
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$size, |
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$size - 2 * $additionalWhitespace, |
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$size - 2 * $additionalWhitespace |
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); |
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return $targetImage; |
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} |
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/** |
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* @param resource $image |
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* @param int[] $foregroundColor |
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* |
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* @return int |
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*/ |
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protected function calculateAdditionalWhiteSpace($image, array $foregroundColor): int |
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{ |
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$width = imagesx($image); |
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$height = imagesy($image); |
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$foregroundColor = imagecolorallocate( |
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$image, |
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$foregroundColor['r'], |
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$foregroundColor['g'], |
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$foregroundColor['b'] |
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); |
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$whitespace = $width; |
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for ($y = 0; $y < $height; $y++) { |
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for ($x = 0; $x < $width; $x++) { |
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$color = imagecolorat($image, $x, $y); |
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if ($color == $foregroundColor || $x == $whitespace) { |
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$whitespace = min($whitespace, $x); |
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break; |
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} |
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} |
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} |
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return $whitespace; |
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} |
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/** |
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* @param resource $sourceImage |
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* @param string $logoPath |
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* @param int $logoWidth |
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* |
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* @return resource |
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*/ |
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protected function addLogo($sourceImage, $logoPath, $logoWidth = null) |
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{ |
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$logoImage = imagecreatefromstring(file_get_contents($logoPath)); |
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$logoSourceWidth = imagesx($logoImage); |
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$logoSourceHeight = imagesy($logoImage); |
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$logoTargetWidth = $logoWidth; |
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if ($logoTargetWidth === null) { |
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$logoTargetWidth = $logoSourceWidth; |
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$logoTargetHeight = $logoSourceHeight; |
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} else { |
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$scale = $logoTargetWidth / $logoSourceWidth; |
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$logoTargetHeight = intval($scale * imagesy($logoImage)); |
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} |
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$logoX = imagesx($sourceImage) / 2 - $logoTargetWidth / 2; |
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$logoY = imagesy($sourceImage) / 2 - $logoTargetHeight / 2; |
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imagecopyresampled( |
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$sourceImage, |
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$logoImage, |
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$logoX, |
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$logoY, |
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0, |
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0, |
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$logoTargetWidth, |
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$logoTargetHeight, |
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$logoSourceWidth, |
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$logoSourceHeight |
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); |
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return $sourceImage; |
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} |
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/** |
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* @param resource $sourceImage |
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* @param LabelInterface $label |
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* @param int[] $foregroundColor |
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* @param int[] $backgroundColor |
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* |
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* @throws BadMethodCallException |
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* @return resource |
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*/ |
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protected function addLabel( |
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$sourceImage, |
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LabelInterface $label, |
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array $foregroundColor, |
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array $backgroundColor |
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) { |
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if (!function_exists('imagettfbbox')) { |
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throw new BadMethodCallException('Missing function "imagettfbbox". Did you install the FreeType library?'); |
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} |
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$labelText = $label->getText(); |
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$labelFontSize = $label->getFontSize(); |
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$labelFontPath = $label->getFont(); |
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$labelMargin = $label->getMargins(); |
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$labelAlignment = $label->getAlignment(); |
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$labelBox = imagettfbbox($labelFontSize, 0, $labelFontPath, $labelText); |
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$labelBoxWidth = ($labelBox[2] - $labelBox[0]); |
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$labelBoxHeight = ($labelBox[0] - $labelBox[7]); |
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$sourceWidth = imagesx($sourceImage); |
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$sourceHeight = imagesy($sourceImage); |
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$targetWidth = $sourceWidth; |
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$targetHeight = $sourceHeight + $labelBoxHeight + $labelMargin['t'] + $labelMargin['b']; |
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// Create empty target image |
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$targetImage = imagecreatetruecolor($targetWidth, $targetHeight); |
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$foregroundColor = imagecolorallocate( |
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$targetImage, |
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$foregroundColor['r'], |
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$foregroundColor['g'], |
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$foregroundColor['b'] |
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); |
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$backgroundColor = imagecolorallocate( |
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$targetImage, |
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$backgroundColor['r'], |
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$backgroundColor['g'], |
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$backgroundColor['b'] |
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); |
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imagefill($targetImage, 0, 0, $backgroundColor); |
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// Copy source image to target image |
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imagecopyresampled( |
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$targetImage, |
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$sourceImage, |
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0, |
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0, |
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0, |
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0, |
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$sourceWidth, |
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$sourceHeight, |
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$sourceWidth, |
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$sourceHeight |
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); |
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switch ($labelAlignment) { |
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case LabelInterface::ALIGN_LEFT: |
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$labelX = $labelMargin['l']; |
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break; |
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case LabelInterface::ALIGN_RIGHT: |
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$labelX = $targetWidth - $labelBoxWidth - $labelMargin['r']; |
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break; |
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default: |
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$labelX = (int)($targetWidth / 2 - $labelBoxWidth / 2); |
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break; |
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} |
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$labelY = $targetHeight - $labelMargin['b']; |
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imagettftext($targetImage, $labelFontSize, 0, $labelX, $labelY, $foregroundColor, $labelFontPath, $labelText); |
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return $targetImage; |
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} |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: