sprites/SpriteFrame.php

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<?php

abstract class SpriteFrame {

    
    private $decoded;
    protected $gdImage;
    private $width;
    private $height;


    

    public function SpriteFrame($width,$height,$decoded=false) {
        if($width == 0) {
            throw new Exception('Zero width');
        } else if($height == 0) {
            throw new Exception('Zero height');
        }
        $this->width = $width;
        $this->height = $height;
        $this->decoded = $decoded;
    }

    protected function HasBeenDecoded() {
        return $this->decoded;  
    }



    public function GetGDImage() {
        $this->EnsureDecoded();
        return $this->gdImage;
    }

    public function GetWidth() {
        return $this->width;
    }
    public function GetHeight() {
        return $this->height;
    }


    public function GetPixel($x,$y) {
        $this->EnsureDecoded();
        $colori = imagecolorat($this->gdImage, $x, $y);
        $color = imagecolorsforindex($this->gdImage, $colori);
        return $color;
    }


    public function SetPixel($x,$y,$r,$g,$b) {
        $this->EnsureDecoded();
        imagesetpixel($this->gdImage, $x, $y, imagecolorallocate($this->gdImage, $r, $g, $b));
    }

    

    protected function EnsureDecoded() {
        if(!$this->decoded)
            $this->Decode();

        $this->decoded = true;
    }



    protected abstract function Decode();

    public abstract function Encode();


    public function ToSpriteFrame($type) {
        $this->EnsureDecoded();
        if(substr(get_class($this),0,3) == $type && substr(get_class($this),3) == 'Frame') {
            return $this;
        }
        switch($type) {
        case 'C16':
            return new C16Frame($this->GetGDImage());
        case 'S16':
            return new S16Frame($this->GetGDImage());
        case 'SPR':
            return new SPRFrame($this->GetGDImage());
        default:
            throw new Exception('Invalid sprite type '.$type.'.');
        }
    }


    public function ToPNG() {
        $this->EnsureDecoded();
        ob_start();
        imagepng($this->GetGDImage());
        $data = ob_get_contents();
        ob_end_clean();
        return $data;
    }
}
?>