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<?php declare(strict_types = 1); namespace BaconQrCode\Renderer\Image; use BaconQrCode\Exception\RuntimeException; use BaconQrCode\Renderer\Color\ColorInterface; use BaconQrCode\Renderer\Path\Path; use BaconQrCode\Renderer\RendererStyle\Gradient; /** * Interface for back ends able to to produce path based images. */ interface ImageBackEndInterface { /** * Starts a new image. * * If a previous image was already started, previous data get erased. */ public function new(int $size, ColorInterface $backgroundColor) : void; /** * Transforms all following drawing operation coordinates by scaling them by a given factor. * * @throws RuntimeException if no image was started yet. */ public function scale(float $size) : void; /** * Transforms all following drawing operation coordinates by translating them by a given amount. * * @throws RuntimeException if no image was started yet. */ public function translate(float $x, float $y) : void; /** * Transforms all following drawing operation coordinates by rotating them by a given amount. * * @throws RuntimeException if no image was started yet. */ public function rotate(int $degrees) : void; /** * Pushes the current coordinate transformation onto a stack. * * @throws RuntimeException if no image was started yet. */ public function push() : void; /** * Pops the last coordinate transformation from a stack. * * @throws RuntimeException if no image was started yet. */ public function pop() : void; /** * Draws a path with a given color. * * @throws RuntimeException if no image was started yet. */ public function drawPathWithColor(Path $path, ColorInterface $color) : void; /** * Draws a path with a given gradient which spans the box described by the position and size. * * @throws RuntimeException if no image was started yet. */ public function drawPathWithGradient( Path $path, Gradient $gradient, float $x, float $y, float $width, float $height ) : void; /** * Ends the image drawing operation and returns the resulting blob. * * This should reset the state of the back end and thus this method should only be callable once per image. * * @throws RuntimeException if no image was started yet. */ public function done() : string; }