Viewing file:  SvgImageBackEnd.php (12.33 KB) -rwxr-x---
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<?php
declare(strict_types = 1);
namespace BaconQrCode\Renderer\Image;
use BaconQrCode\Exception\RuntimeException;
use BaconQrCode\Renderer\Color\Alpha;
use BaconQrCode\Renderer\Color\ColorInterface;
use BaconQrCode\Renderer\Path\Close;
use BaconQrCode\Renderer\Path\Curve;
use BaconQrCode\Renderer\Path\EllipticArc;
use BaconQrCode\Renderer\Path\Line;
use BaconQrCode\Renderer\Path\Move;
use BaconQrCode\Renderer\Path\Path;
use BaconQrCode\Renderer\RendererStyle\Gradient;
use BaconQrCode\Renderer\RendererStyle\GradientType;
use XMLWriter;
final class SvgImageBackEnd implements ImageBackEndInterface
{
private const PRECISION = 3;
/**
* @var XMLWriter|null
*/
private $xmlWriter;
/**
* @var int[]|null
*/
private $stack;
/**
* @var int|null
*/
private $currentStack;
/**
* @var int|null
*/
private $gradientCount;
public function __construct()
{
if (! class_exists(XMLWriter::class)) {
throw new RuntimeException('You need to install the libxml extension to use this back end');
}
}
public function new(int $size, ColorInterface $backgroundColor) : void
{
$this->xmlWriter = new XMLWriter();
$this->xmlWriter->openMemory();
$this->xmlWriter->startDocument('1.0', 'UTF-8');
$this->xmlWriter->startElement('svg');
$this->xmlWriter->writeAttribute('xmlns', 'http://www.w3.org/2000/svg');
$this->xmlWriter->writeAttribute('version', '1.1');
$this->xmlWriter->writeAttribute('width', (string) $size);
$this->xmlWriter->writeAttribute('height', (string) $size);
$this->xmlWriter->writeAttribute('viewBox', '0 0 '. $size . ' ' . $size);
$this->gradientCount = 0;
$this->currentStack = 0;
$this->stack[0] = 0;
$alpha = 1;
if ($backgroundColor instanceof Alpha) {
$alpha = $backgroundColor->getAlpha() / 100;
}
if (0 === $alpha) {
return;
}
$this->xmlWriter->startElement('rect');
$this->xmlWriter->writeAttribute('x', '0');
$this->xmlWriter->writeAttribute('y', '0');
$this->xmlWriter->writeAttribute('width', (string) $size);
$this->xmlWriter->writeAttribute('height', (string) $size);
$this->xmlWriter->writeAttribute('fill', $this->getColorString($backgroundColor));
if ($alpha < 1) {
$this->xmlWriter->writeAttribute('fill-opacity', (string) $alpha);
}
$this->xmlWriter->endElement();
}
public function scale(float $size) : void
{
if (null === $this->xmlWriter) {
throw new RuntimeException('No image has been started');
}
$this->xmlWriter->startElement('g');
$this->xmlWriter->writeAttribute(
'transform',
sprintf('scale(%s)', round($size, self::PRECISION))
);
++$this->stack[$this->currentStack];
}
public function translate(float $x, float $y) : void
{
if (null === $this->xmlWriter) {
throw new RuntimeException('No image has been started');
}
$this->xmlWriter->startElement('g');
$this->xmlWriter->writeAttribute(
'transform',
sprintf('translate(%s,%s)', round($x, self::PRECISION), round($y, self::PRECISION))
);
++$this->stack[$this->currentStack];
}
public function rotate(int $degrees) : void
{
if (null === $this->xmlWriter) {
throw new RuntimeException('No image has been started');
}
$this->xmlWriter->startElement('g');
$this->xmlWriter->writeAttribute('transform', sprintf('rotate(%d)', $degrees));
++$this->stack[$this->currentStack];
}
public function push() : void
{
if (null === $this->xmlWriter) {
throw new RuntimeException('No image has been started');
}
$this->xmlWriter->startElement('g');
$this->stack[] = 1;
++$this->currentStack;
}
public function pop() : void
{
if (null === $this->xmlWriter) {
throw new RuntimeException('No image has been started');
}
for ($i = 0; $i < $this->stack[$this->currentStack]; ++$i) {
$this->xmlWriter->endElement();
}
array_pop($this->stack);
--$this->currentStack;
}
public function drawPathWithColor(Path $path, ColorInterface $color) : void
{
if (null === $this->xmlWriter) {
throw new RuntimeException('No image has been started');
}
$alpha = 1;
if ($color instanceof Alpha) {
$alpha = $color->getAlpha() / 100;
}
$this->startPathElement($path);
$this->xmlWriter->writeAttribute('fill', $this->getColorString($color));
if ($alpha < 1) {
$this->xmlWriter->writeAttribute('fill-opacity', (string) $alpha);
}
$this->xmlWriter->endElement();
}
public function drawPathWithGradient(
Path $path,
Gradient $gradient,
float $x,
float $y,
float $width,
float $height
) : void {
if (null === $this->xmlWriter) {
throw new RuntimeException('No image has been started');
}
$gradientId = $this->createGradientFill($gradient, $x, $y, $width, $height);
$this->startPathElement($path);
$this->xmlWriter->writeAttribute('fill', 'url(#' . $gradientId . ')');
$this->xmlWriter->endElement();
}
public function done() : string
{
if (null === $this->xmlWriter) {
throw new RuntimeException('No image has been started');
}
foreach ($this->stack as $openElements) {
for ($i = $openElements; $i > 0; --$i) {
$this->xmlWriter->endElement();
}
}
$this->xmlWriter->endDocument();
$blob = $this->xmlWriter->outputMemory(true);
$this->xmlWriter = null;
$this->stack = null;
$this->currentStack = null;
$this->gradientCount = null;
return $blob;
}
private function startPathElement(Path $path) : void
{
$pathData = [];
foreach ($path as $op) {
switch (true) {
case $op instanceof Move:
$pathData[] = sprintf(
'M%s %s',
round($op->getX(), self::PRECISION),
round($op->getY(), self::PRECISION)
);
break;
case $op instanceof Line:
$pathData[] = sprintf(
'L%s %s',
round($op->getX(), self::PRECISION),
round($op->getY(), self::PRECISION)
);
break;
case $op instanceof EllipticArc:
$pathData[] = sprintf(
'A%s %s %s %u %u %s %s',
round($op->getXRadius(), self::PRECISION),
round($op->getYRadius(), self::PRECISION),
round($op->getXAxisAngle(), self::PRECISION),
$op->isLargeArc(),
$op->isSweep(),
round($op->getX(), self::PRECISION),
round($op->getY(), self::PRECISION)
);
break;
case $op instanceof Curve:
$pathData[] = sprintf(
'C%s %s %s %s %s %s',
round($op->getX1(), self::PRECISION),
round($op->getY1(), self::PRECISION),
round($op->getX2(), self::PRECISION),
round($op->getY2(), self::PRECISION),
round($op->getX3(), self::PRECISION),
round($op->getY3(), self::PRECISION)
);
break;
case $op instanceof Close:
$pathData[] = 'Z';
break;
default:
throw new RuntimeException('Unexpected draw operation: ' . get_class($op));
}
}
$this->xmlWriter->startElement('path');
$this->xmlWriter->writeAttribute('fill-rule', 'evenodd');
$this->xmlWriter->writeAttribute('d', implode('', $pathData));
}
private function createGradientFill(Gradient $gradient, float $x, float $y, float $width, float $height) : string
{
$this->xmlWriter->startElement('defs');
$startColor = $gradient->getStartColor();
$endColor = $gradient->getEndColor();
if ($gradient->getType() === GradientType::RADIAL()) {
$this->xmlWriter->startElement('radialGradient');
} else {
$this->xmlWriter->startElement('linearGradient');
}
$this->xmlWriter->writeAttribute('gradientUnits', 'userSpaceOnUse');
switch ($gradient->getType()) {
case GradientType::HORIZONTAL():
$this->xmlWriter->writeAttribute('x1', (string) round($x, self::PRECISION));
$this->xmlWriter->writeAttribute('y1', (string) round($y, self::PRECISION));
$this->xmlWriter->writeAttribute('x2', (string) round($x + $width, self::PRECISION));
$this->xmlWriter->writeAttribute('y2', (string) round($y, self::PRECISION));
break;
case GradientType::VERTICAL():
$this->xmlWriter->writeAttribute('x1', (string) round($x, self::PRECISION));
$this->xmlWriter->writeAttribute('y1', (string) round($y, self::PRECISION));
$this->xmlWriter->writeAttribute('x2', (string) round($x, self::PRECISION));
$this->xmlWriter->writeAttribute('y2', (string) round($y + $height, self::PRECISION));
break;
case GradientType::DIAGONAL():
$this->xmlWriter->writeAttribute('x1', (string) round($x, self::PRECISION));
$this->xmlWriter->writeAttribute('y1', (string) round($y, self::PRECISION));
$this->xmlWriter->writeAttribute('x2', (string) round($x + $width, self::PRECISION));
$this->xmlWriter->writeAttribute('y2', (string) round($y + $height, self::PRECISION));
break;
case GradientType::INVERSE_DIAGONAL():
$this->xmlWriter->writeAttribute('x1', (string) round($x, self::PRECISION));
$this->xmlWriter->writeAttribute('y1', (string) round($y + $height, self::PRECISION));
$this->xmlWriter->writeAttribute('x2', (string) round($x + $width, self::PRECISION));
$this->xmlWriter->writeAttribute('y2', (string) round($y, self::PRECISION));
break;
case GradientType::RADIAL():
$this->xmlWriter->writeAttribute('cx', (string) round(($x + $width) / 2, self::PRECISION));
$this->xmlWriter->writeAttribute('cy', (string) round(($y + $height) / 2, self::PRECISION));
$this->xmlWriter->writeAttribute('r', (string) round(max($width, $height) / 2, self::PRECISION));
break;
}
$id = sprintf('g%d', ++$this->gradientCount);
$this->xmlWriter->writeAttribute('id', $id);
$this->xmlWriter->startElement('stop');
$this->xmlWriter->writeAttribute('offset', '0%');
$this->xmlWriter->writeAttribute('stop-color', $this->getColorString($startColor));
if ($startColor instanceof Alpha) {
$this->xmlWriter->writeAttribute('stop-opacity', (string) $startColor->getAlpha());
}
$this->xmlWriter->endElement();
$this->xmlWriter->startElement('stop');
$this->xmlWriter->writeAttribute('offset', '100%');
$this->xmlWriter->writeAttribute('stop-color', $this->getColorString($endColor));
if ($endColor instanceof Alpha) {
$this->xmlWriter->writeAttribute('stop-opacity', (string) $endColor->getAlpha());
}
$this->xmlWriter->endElement();
$this->xmlWriter->endElement();
$this->xmlWriter->endElement();
return $id;
}
private function getColorString(ColorInterface $color) : string
{
$color = $color->toRgb();
return sprintf(
'#%02x%02x%02x',
$color->getRed(),
$color->getGreen(),
$color->getBlue()
);
}
}
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