FPDF 和电视/电影剧本格式

Question

我想创建一个 PHP 脚本，将 XML 格式化为电视/电影剧本，事实证明这比预期的要困难一些。我已经创建了一些代码，但是，在某些特定的地方我会卡住。

一点背景

在剧本中存在多个标签，如角色、对话、场景标题、过渡等。它们具有不同的宽度和左右边距，确定页面上的位置。

有两个主要领域受到关注，即我无法弄清楚：

• 父/子 XML 标签，不能分开。
• 如果子标签很长并且必须继续到另一个页面，则必须创建后续标签以显示它仍然是父标签。例如，如果显示一个字符标签，并且该标签的对话框（通过宽度、字符长度和行高）计算（通过宽度、字符长度和行高）以继续到下一页，那么父标签“字符”必须再次显示在下一页的顶部。
  • 这样的父/孤标签包括：
  • "sceneheadng" -> 任何标签。
  • “字符”-> 对话框或括号
  • “括号”-> 对话框

然而，理想情况下，父/子标签应该存储在这样的地方，这样可以在没有大量代码的情况下添加更多。

经过多次 FPDF 配置和尝试，这是我目前所拥有的：

// Parse the XML string which has been requested from the database.
$xml                        = new SimpleXmlIterator($file, null);
$namespaces                 = $xml->getNamespaces(true);
/*
 * An external function which converts the XML into an ORDERED array.
 * This returns all the attributes of the xml and the following:
 *  "@type"     Refers to the type, i.e. character/dialog etc,
 *  "@content"  What was actually within the tags of the XML.
 */
$source                     = $parseXML($xml, $namespaces);
$saved                      = array ();
// For every line of the XML.
foreach ($source as $index => $line) {
    /*
     * We are going to save the current line of the XML so that we
     * can check the size of the saved cells against the size of the 
     * page. If there is not enough space for specific tags which are
     * required such as character and dialog, then we create a new page.
     * 
     */
    $saved[]                = $line;
    $forward                = false;
    /*
     * Here is where I get somewhat confused - I have attempted to create
     * a mechanism that determines the "@types" which are needed as parents
     * and children of one another. 
     *
     * The $forward variable refers to the possibilty of writing the tag to
     * the PDF. If the parent/orphan is possible or there are non, then it
     * should be able to write.
     */
    if ($forward) {
        $width              = 0;
        foreach ($saved as $index => $value) {
            /*
             * Everything is measured in inches, therefore, I have created a 
             * point() function which turns inches into mm so that FPDF understands
             * everything.
             * 
             * The $format variable is an array which has margins, either top,
             * left or right. We use this to position the Cell of a specific @type
             * so that it appears in the correct format for a TV/Film script.
             *
             * The width variable is deduced via finding the full width of the page,
             * then subtracting the subsequent left and right margin of the said
             * @type.
             */     
            $width          = (point ($setting["width"])
                            - (point ($format[$value["@type"]]["margin-left"])
                            +  point ($format[$value["@type"]]["margin-right"])));
            /*
             * The $pdf variable is that of the FPDF Class.
             */
            $pdf->SetLeftMargin (point($format[$value["@type"]]["margin-left"]));
            $pdf->SetRightMargin (point($format[$value["@type"]]["margin-right"]));
            // Formatting purposes.
            $pdf->Ln (0);   
            $pdf->MultiCell (
                $width,
                point ($setting["line-height"]), //Line height? Still needs fixing.
                $value["@content"], // Physical text
                1); // A temporary border to see what's going on.
        }
        // Reset the $saved, after no more parent/children?
        $saved              = array ();
    }
}

另外，我写了一个函数来计算组合“$saved”行的高度：

function calculate_page_breaks ($saved_lines, $act_upon = true) {
    $num_lines          = 0;
    foreach ($saved_lines as $value) {
        $column_width   = (point ($setting["width"])
                        - (point ($format[$type][$value["@type"]]["margin-left"])
                        +  point ($format[$type][$value["@type"]]["margin-right"])));
        $num_lines      += ceil($pdf->GetStringWidth($value["@content"]) / ($column_width - 1));
    }
    $cell_height        = 5 + 1; // have cells at a height of five so set to six for a padding
    $height_of_cell     = ceil($num_lines * $cell_height); 
    $space_left         = point($setting["height"]) - $pdf->GetY();
    $space_left         -= point($format[$type]["margin-bottom"]);
    // test if height of cell is greater than space left
    if ($height_of_cell >= $space_left) {
        // If this is not just a check, then we can physically "break" the page.
        if ($act_upon) {
            $pdf->Ln ();                        
            $pdf->AddPage (); // page break
            $pdf->SetTopMargin ($point($format[$type]["margin-top"]));
            $pdf->SetLeftMargin ($point($format[$type]["margin-left"]));
            $pdf->SetRightMargin ($point($format[$type]["margin-right"]));
            $pdf->MultiCell (100,5,'','B',2); // this creates a blank row for formatting reasons
        }
        return false;
    } else {
        return true;
    }
}

编辑

我发现 LaTeX 提供了一个剧本类（http://www.tug.org/texlive/Contents/live/texmf-dist/doc/latex/screenplay/screenplay.pdf），但是，我已经搜索过了并广泛寻找基于PHP的工具将LaTeX转换为PDF，但没有成功。我知道 LaTeX 在服务器端运行，但是我仍然需要基于 PHP 的命令进程才能使用 LaTeX 生成所述 PDF 文件。

此外，在服务器上安装二进制文件、库或工具是不允许的。我可以使用的工具是 PHP 及其内置的功能。任何可以将 LaTex 转换为 PDF 的类或 PHP 工具都非常有用。

Answer 1

鉴于您的要求，我建议使用在线网络服务来推送您的 LateX 文件并获得编译后的 PDF 作为回报。

这意味着您可以获得完整的 PDF 文件，无需任何编译、无需安装，只是纯基于 PHP 的网络服务和 API。

有许多在线解决方案，有些是免费的，所以请查看适合您需要的解决方案：Compiling documents online

祝你好运！