GdThumb::resizePercent PHP Method

    public function resizePercent($percent = 0)
    {
        if (!is_numeric($percent)) {
            throw new InvalidArgumentException('$percent must be numeric');
        }
        $this->percent = intval($percent);
        $this->calcImageSizePercent($this->currentDimensions['width'], $this->currentDimensions['height']);
        if (function_exists('imagecreatetruecolor')) {
            $this->workingImage = imagecreatetruecolor($this->newDimensions['newWidth'], $this->newDimensions['newHeight']);
        } else {
            $this->workingImage = imagecreate($this->newDimensions['newWidth'], $this->newDimensions['newHeight']);
        }
        $this->preserveAlpha();
        ImageCopyResampled($this->workingImage, $this->oldImage, 0, 0, 0, 0, $this->newDimensions['newWidth'], $this->newDimensions['newHeight'], $this->currentDimensions['width'], $this->currentDimensions['height']);
        $this->oldImage = $this->workingImage;
        $this->currentDimensions['width'] = $this->newDimensions['newWidth'];
        $this->currentDimensions['height'] = $this->newDimensions['newHeight'];
        return $this;
    }