pdfbox 获取开始文本部分 (BT ET) 坐标

Question

有人可以帮我获取 pdf begintext 部分的真实像素坐标吗？ 我正在使用 pdfbox 从 pdf 文件中检索文本，但现在我需要获取围绕该文本部分/段落的矩形。

$contents = $page->getContents();
$contentsStream = $page->getContents()->getStream();
$resources=$page->getResources();
$fonts = $resources->getFonts();
$xobjects = $resources->getImages();
$tokens=$contentsStream->getStreamTokens();

• [PDFOperator{q}、COSFloat{690.48}、COSInt{0}、COSInt{0}、COSFloat{633.6}、COSInt{0}、COSInt{0}、PDFOperator{cm}、COSName{im1}、PDFOperator {Do}，PDFOperator{Q}，

• PDFOperator{BT}、COSInt{1}、COSInt{0}、COSInt{0}、COSInt{1}、 COSFloat{25.92}、COSFloat{588.48}、PDFOperator{Tm}、COSInt{99}、PDFOperator{Tz}、COSName{F30}、COSInt{56}、PDFOperator{Tf}、COSInt{3}、PDFOperator{Tr}、 COSFloat{0.334}、PDFOperator{Tc}、 COSString{Pospremanj}、PDFOperator{Tj}、COSInt{0}、PDFOperator{Tc}、COSString{e}、PDFOperator{Tj}、COSFloat{9.533}、PDFOperator{Tw}、COSString{ i}、PDFOperator{Tj}、 COSFloat{6.062}、PDFOperator{Tw}、COSFloat{0.95}、 PDFOperator{Tc}、COSString{ ciscenj}、PDFOperator{Tj}、COSInt{0}、PDFOperator{Tc}、COSString{e }、PDFOperator{Tj}、COSInt{1}、COSInt{0}、COSInt{0}、 COSInt{1}、COSFloat{55.68}、COSFloat{539.76}、PDFOperator{Tm}、 COSInt{0}、PDFOperator{Tw}、COSFloat{0.262}、PDFOperator{Tc}、COSString{uoè}、PDFOperator{Tj}、COSInt{0}、PDFOperator{Tc}、COSString{i}、PDFOperator{Tj}、 COSFloat{5.443}、PDFOperator{Tw}、COSFloat{-2.145}、 PDFOperator{Tc}、COSString{zimslco}、PDFOperator{Tj}、COSInt{0}、PDFOperator{Tc}、COSString{g}、PDFOperator{Tj}、COSFloat{7.202}、PDFOperator{Tw}、COSFloat{-0.148} , PDFOperator{Tc}, COSString{ odmor}, PDFOperator{Tj}, COSInt{0}、PDFOperator{Tc}、COSString{a }、PDFOperator{Tj}、PDFOperator{ET}、

• PDFOperator{BT}、COSInt{1}、COSInt{0}、COSInt{0}、COSInt{1}、COSFloat{6.72}、COSFloat{513.12}、PDFOperator{Tm }、COSInt{0}、PDFOperator{Tw}、COSName{F30}、COSInt{14}、 PDFOperator{Tf}、COSString{}、PDFOperator{Tj}、COSFloat{2.751}、PDFOperator{Tw}、 ...

我想获得类似 PrintTextLocations 函数对每个单词/字符所做的输出。 我可以获取底部和左侧坐标，但如何获取宽度和顶部坐标？

PrintTextLocations：

• 字符串[25.92,45.119995 fs=56.0 xscale=55.440002 height=40.208004 space=15.412322 width=36.978485]p 字符串[63.22914,45.119995 fs=56.0 xscale=55.440002 高度=40.208004 空间=15.412322 宽度=33.87384]o 字符串[97.43364,45.119995 fs=56.0 xscale=55.440002 高度=40.208004 空间=15.412322 宽度=30.824646]s 字符串[128.58894,45.119995 fs=56.0 xscale=55.440002 高度=42.168 空间=15.412322 宽度=33.87384]p 字符串[162.79344,45.119995 fs=56.0 xscale=55.440002 高度=42.168 空间=15.412322 宽度=21.566162]r 字符串[184.69026,45.119995 fs=56.0 xscale=55.440002 高度=42.168 空间=15.412322 宽度=30.824646]e 字符串[215.84557,45.119995 fs=56.0 xscale=55.440002 高度=42.168 空间=15.412322 宽度=49.286148]m ...

Answer 1

...由于 BT 部分为您提供了左下角坐标，因此您需要解析当前 BT 块中包含的所有单词/字母以获取所有其他坐标。
第一个单词高度 + BT 底部 = 顶部，max（左坐标+宽度）= 右侧，最后一个单词底部 = 底部坐标。

我希望这对某人有帮助...

单个字母的示例字符串：

string[32.94,35.099976 fs=8.0 xscale=1.0 height=4.4240003 space=2.2240002 width=3.959999]p

提取、解析和准备行：

32.94,35.099976 fs=8.0 xscale=1.0 height=4.4240003 space=2.2240002 width=3.959999

功能：

/**
 * Parse single word / letter element
 *
 * @param string $str_raw  Extracted word string line.
 * @param string $str_elem Element of interest, word, char.
 * @param int    $pdf_w    Pdf page width.
 * @param int    $pdf_h    Pdf page height.
 * @param int    $pdf_d    Pdf page dpi.
 * @param int    $pdf_r    Pdf page relative dpi.
 *
 * @return array
 */
function createRealCoordinates($str_raw, $str_elem, $pdf_w, $pdf_h, $pdf_d = 400, $pdf_r = 72)
{
    $stringstrip = array('fs=', 'xscale=', 'height=', 'space=', 'width=');
    $string_info = str_replace($stringstrip, '', $str_raw);

    $coord_info = explode(' ', $string_info);
    $coord_xy   = explode(',', $coord_info[0]);

    $coord = array(
        'pdfWidth'  => $pdf_w,
        'pdfHeight' => $pdf_h,
        'pdfDpi'    => $pdf_d,
        'pdfRel'    => $pdf_r,
        'word'      => $str_elem,

        'x1' => null,
        'y1' => null,
        'x2' => null,
        'y2' => null,

        'fontSize'     => null,
        'xScale'       => null,
        'HeightDir'    => null,
        'WidthDir'     => null,
        'WidthOfSpace' => null,
    );

    // Left, Bottom coordinate.
    $coord['x1'] = ($coord_xy[0] / $pdf_r) * $pdf_d;
    $coord['y2'] = ($coord_xy[1] / $pdf_r) * $pdf_d;

    $coord['fontSize']     = $coord_info[1]; // font size.
    $coord['xScale']       = $coord_info[2]; // x size scale.
    $coord['HeightDir']    = $coord_info[3]; // height.
    $coord['WidthDir']     = $coord_info[5]; // word width.
    $coord['WidthOfSpace'] = ($coord_info[4] / $pdf_r) * $pdf_d; // width of space.

    // Right, Top coordinate.
    $coord['x2'] = $coord['x1'] + (($coord['WidthDir'] / $pdf_r) * $pdf_d);
    $coord['y1'] = $coord['y2'] - (($coord['HeightDir'] / $pdf_r) * $pdf_d);

    return $coord;
}

-matija kancijan