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<?php

/*
 * This file is part of the Imagine package.
 *
 * (c) Bulat Shakirzyanov <mallluhuct@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Imagine\Gd;

use Imagine\Draw\DrawerInterface;
use Imagine\Exception\InvalidArgumentException;
use Imagine\Exception\RuntimeException;
use Imagine\Image\AbstractFont;
use Imagine\Image\BoxInterface;
use Imagine\Image\Palette\Color\ColorInterface;
use Imagine\Image\Palette\Color\RGB as RGBColor;
use Imagine\Image\PointInterface;

/**
 * Drawer implementation using the GD library
 */
final class Drawer implements DrawerInterface
{
    /**
     * @var resource
     */
    private $resource;

    /**
     * @var array
     */
    private $info;

    /**
     * Constructs Drawer with a given gd image resource
     *
     * @param resource $resource
     */
    public function __construct($resource)
    {
        $this->loadGdInfo();
        $this->resource = $resource;
    }

    /**
     * {@inheritdoc}
     */
    public function arc(PointInterface $center, BoxInterface $size, $start, $end, ColorInterface $color, $thickness = 1)
    {
        imagesetthickness($this->resource, max(1, (int) $thickness));

        if (false === imagealphablending($this->resource, true)) {
            throw new RuntimeException('Draw arc operation failed');
        }

        if (false === imagearc($this->resource, $center->getX(), $center->getY(), $size->getWidth(), $size->getHeight(), $start, $end, $this->getColor($color))) {
            imagealphablending($this->resource, false);
            throw new RuntimeException('Draw arc operation failed');
        }

        if (false === imagealphablending($this->resource, false)) {
            throw new RuntimeException('Draw arc operation failed');
        }

        return $this;
    }

    /**
     * This function does not work properly because of a bug in GD
     *
     * {@inheritdoc}
     */
    public function chord(PointInterface $center, BoxInterface $size, $start, $end, ColorInterface $color, $fill = false, $thickness = 1)
    {
        imagesetthickness($this->resource, max(1, (int) $thickness));

        if ($fill) {
            $style = IMG_ARC_CHORD;
        } else {
            $style = IMG_ARC_CHORD | IMG_ARC_NOFILL;
        }

        if (false === imagealphablending($this->resource, true)) {
            throw new RuntimeException('Draw chord operation failed');
        }

        if (false === imagefilledarc($this->resource, $center->getX(), $center->getY(), $size->getWidth(), $size->getHeight(), $start, $end, $this->getColor($color), $style)) {
            imagealphablending($this->resource, false);
            throw new RuntimeException('Draw chord operation failed');
        }

        if (false === imagealphablending($this->resource, false)) {
            throw new RuntimeException('Draw chord operation failed');
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function ellipse(PointInterface $center, BoxInterface $size, ColorInterface $color, $fill = false, $thickness = 1)
    {
        imagesetthickness($this->resource, max(1, (int) $thickness));

        if ($fill) {
            $callback = 'imagefilledellipse';
        } else {
            $callback = 'imageellipse';
        }

        if (false === imagealphablending($this->resource, true)) {
            throw new RuntimeException('Draw ellipse operation failed');
        }

        if (false === $callback($this->resource, $center->getX(), $center->getY(), $size->getWidth(), $size->getHeight(), $this->getColor($color))) {
            imagealphablending($this->resource, false);
            throw new RuntimeException('Draw ellipse operation failed');
        }

        if (false === imagealphablending($this->resource, false)) {
            throw new RuntimeException('Draw ellipse operation failed');
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function line(PointInterface $start, PointInterface $end, ColorInterface $color, $thickness = 1)
    {
        imagesetthickness($this->resource, max(1, (int) $thickness));

        if (false === imagealphablending($this->resource, true)) {
            throw new RuntimeException('Draw line operation failed');
        }

        if (false === imageline($this->resource, $start->getX(), $start->getY(), $end->getX(), $end->getY(), $this->getColor($color))) {
            imagealphablending($this->resource, false);
            throw new RuntimeException('Draw line operation failed');
        }

        if (false === imagealphablending($this->resource, false)) {
            throw new RuntimeException('Draw line operation failed');
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function pieSlice(PointInterface $center, BoxInterface $size, $start, $end, ColorInterface $color, $fill = false, $thickness = 1)
    {
        imagesetthickness($this->resource, max(1, (int) $thickness));

        if ($fill) {
            $style = IMG_ARC_EDGED;
        } else {
            $style = IMG_ARC_EDGED | IMG_ARC_NOFILL;
        }

        if (false === imagealphablending($this->resource, true)) {
            throw new RuntimeException('Draw chord operation failed');
        }

        if (false === imagefilledarc($this->resource, $center->getX(), $center->getY(), $size->getWidth(), $size->getHeight(), $start, $end, $this->getColor($color), $style)) {
            imagealphablending($this->resource, false);
            throw new RuntimeException('Draw chord operation failed');
        }

        if (false === imagealphablending($this->resource, false)) {
            throw new RuntimeException('Draw chord operation failed');
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function dot(PointInterface $position, ColorInterface $color)
    {
        if (false === imagealphablending($this->resource, true)) {
            throw new RuntimeException('Draw point operation failed');
        }

        if (false === imagesetpixel($this->resource, $position->getX(), $position->getY(), $this->getColor($color))) {
            imagealphablending($this->resource, false);
            throw new RuntimeException('Draw point operation failed');
        }

        if (false === imagealphablending($this->resource, false)) {
            throw new RuntimeException('Draw point operation failed');
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function polygon(array $coordinates, ColorInterface $color, $fill = false, $thickness = 1)
    {
        imagesetthickness($this->resource, max(1, (int) $thickness));

        if (count($coordinates) < 3) {
            throw new InvalidArgumentException(sprintf('A polygon must consist of at least 3 points, %d given', count($coordinates)));
        }

        $points = call_user_func_array('array_merge', array_map(function (PointInterface $p) {
            return array($p->getX(), $p->getY());
        }, $coordinates));

        if ($fill) {
            $callback = 'imagefilledpolygon';
        } else {
            $callback = 'imagepolygon';
        }

        if (false === imagealphablending($this->resource, true)) {
            throw new RuntimeException('Draw polygon operation failed');
        }

        if (false === $callback($this->resource, $points, count($coordinates), $this->getColor($color))) {
            imagealphablending($this->resource, false);
            throw new RuntimeException('Draw polygon operation failed');
        }

        if (false === imagealphablending($this->resource, false)) {
            throw new RuntimeException('Draw polygon operation failed');
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function text($string, AbstractFont $font, PointInterface $position, $angle = 0, $width = null)
    {
        if (!$this->info['FreeType Support']) {
            throw new RuntimeException('GD is not compiled with FreeType support');
        }

        $angle    = -1 * $angle;
        $fontsize = $font->getSize();
        $fontfile = $font->getFile();
        $x        = $position->getX();
        $y        = $position->getY() + $fontsize;

        if ($width !== null) {
            $string = $this->wrapText($string, $font, $angle, $width);
        }

        if (false === imagealphablending($this->resource, true)) {
            throw new RuntimeException('Font mask operation failed');
        }

        if (false === imagefttext($this->resource, $fontsize, $angle, $x, $y, $this->getColor($font->getColor()), $fontfile, $string)) {
            imagealphablending($this->resource, false);
            throw new RuntimeException('Font mask operation failed');
        }

        if (false === imagealphablending($this->resource, false)) {
            throw new RuntimeException('Font mask operation failed');
        }

        return $this;
    }

    /**
     * Internal
     *
     * Generates a GD color from Color instance
     *
     * @param ColorInterface $color
     *
     * @return resource
     *
     * @throws RuntimeException
     * @throws InvalidArgumentException
     */
    private function getColor(ColorInterface $color)
    {
        if (!$color instanceof RGBColor) {
            throw new InvalidArgumentException('GD driver only supports RGB colors');
        }

        $gdColor = imagecolorallocatealpha($this->resource, $color->getRed(), $color->getGreen(), $color->getBlue(), (100 - $color->getAlpha()) * 127 / 100);
        if (false === $gdColor) {
            throw new RuntimeException(sprintf('Unable to allocate color "RGB(%s, %s, %s)" with transparency of %d percent', $color->getRed(), $color->getGreen(), $color->getBlue(), $color->getAlpha()));
        }

        return $gdColor;
    }

    private function loadGdInfo()
    {
        if (!function_exists('gd_info')) {
            throw new RuntimeException('Gd not installed');
        }

        $this->info = gd_info();
    }

    /**
     * Internal
     *
     * Fits a string into box with given width
     */
    private function wrapText($string, AbstractFont $font, $angle, $width)
    {
        $result = '';
        $words = explode(' ', $string);
        foreach ($words as $word) {
            $teststring = $result . ' ' . $word;
            $testbox = imagettfbbox($font->getSize(), $angle, $font->getFile(), $teststring);
            if ($testbox[2] > $width) {
                $result .= ($result == '' ? '' : "\n") . $word;
            } else {
                $result .= ($result == '' ? '' : ' ') . $word;
            }
        }

        return $result;
    }
}
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