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TextModifier.php
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94 lines (80 loc) · 2.5 KB
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<?php
declare(strict_types=1);
namespace Intervention\Image\Modifiers;
use Intervention\Image\Drivers\SpecializableModifier;
use Intervention\Image\Exceptions\ColorException;
use Intervention\Image\Exceptions\RuntimeException;
use Intervention\Image\Geometry\Point;
use Intervention\Image\Interfaces\ColorInterface;
use Intervention\Image\Interfaces\FontInterface;
use Intervention\Image\Interfaces\PointInterface;
class TextModifier extends SpecializableModifier
{
/**
* Create new modifier object
*
* @return void
*/
public function __construct(
public string $text,
public PointInterface $position,
public FontInterface $font
) {
//
}
/**
* Decode text color
*
* The text outline effect is drawn with a trick by plotting additional text
* under the actual text with an offset in the color of the outline effect.
* For this reason, no colors with transparency can be used for the text
* color or the color of the stroke effect, as this would be superimposed.
*
* @throws RuntimeException
* @throws ColorException
*/
protected function textColor(): ColorInterface
{
$color = $this->driver()->handleInput($this->font->color());
if ($this->font->hasStrokeEffect() && $color->isTransparent()) {
throw new ColorException(
'The text color must be fully opaque when using the stroke effect.'
);
}
return $color;
}
/**
* Decode outline stroke color
*
* @throws RuntimeException
* @throws ColorException
*/
protected function strokeColor(): ColorInterface
{
$color = $this->driver()->handleInput($this->font->strokeColor());
if ($color->isTransparent()) {
throw new ColorException(
'The stroke color must be fully opaque.'
);
}
return $color;
}
/**
* Return array of offset points to draw text stroke effect below the actual text
*
* @return array<PointInterface>
*/
protected function strokeOffsets(FontInterface $font): array
{
$offsets = [];
if ($font->strokeWidth() <= 0) {
return $offsets;
}
for ($x = $font->strokeWidth() * -1; $x <= $font->strokeWidth(); $x++) {
for ($y = $font->strokeWidth() * -1; $y <= $font->strokeWidth(); $y++) {
$offsets[] = new Point($x, $y);
}
}
return $offsets;
}
}