pukiwiki/数式プラグイン のバックアップ(No.1)

更新


公開メモ

LANG:php
<?php
//
// pukiwiki用 数式プラグイン (math.inc.php)
//   Copywrite 2011 Osamu Takeuchi <osamu@big.jp>
//
// [インストール]
//   ソースファイルを (pukiwiki)/plugin/ ディレクトリにコピーする
//
// [設定]
//   MATHIMG_DIR に画像ファイルが作成される
//   標準では (pukiwiki)/mathimg に画像ファイルが作成される
//
// [使い方]
//   &math(y=ax^2+bx+c); のように、&math(); 中に TeX ソース形式で
//   数式を記述する
//   TeX ソースとしては amsmath, amssymb, bm パッケージを利用し、
//   equation + split 環境で評価される
//

//math mode image repository
define("MATHIMG_DIR", "./mathimg");

function use_svg()
{
    return strstr( getenv("HTTP_USER_AGENT"), "Mozilla/5" ) != false;
}

function user_macros()
{
    return 
       '\newcommand{\MARU}[1]
        {{\ooalign{\hfil#1\/\hfil\crcr\raise.167ex\hbox{\mathhexbox20D}}}}
        \newcommand{\D}[0]{{\rm d}}
        \newcommand{\PD}[0]{\partial}
        \newcommand{\ROT}[0]{{\rm rot}\,}
        \newcommand{\DIV}[0]{{\rm div}\,}
        \newcommand{\GRAD}[0]{{\rm grad}\,}
        ';

}

function math2tex($math){
    return 
       '\documentclass[12pt,fleqn]{jarticle}
        \pagestyle{empty}
        \usepackage{amsmath,amssymb,bm}
        \begin{document}
        \setlength{\hoffset}{-1in}
        \setlength{\voffset}{-1in}
        \setlength{\topmargin}{0mm}
        \setlength{\headheight}{0mm}
        \setlength{\headsep}{0mm}
        \setlength{\oddsidemargin}{0mm}
        \setlength{\mathindent}{0mm}
        ' . user_macros() .
       '\begin{equation*}
        \begin{split}
        ' . $math .
       '\end{split}
        \end{equation*}
        \end{document}';
}

class MinMax {
    var $min = null;
    var $max = null;
    function update($x){
        if (is_null($this->min)) {
            $this->min = $x;
            $this->max = $x;
        } else
        if ($x<$this->min) {
            $this->min = $x;
        } else
        if ($this->max<$x) {
            $this->max = $x;
        }
    }
    function min()
    { return $this->min; }
    function max()
    { return $this->max; }
}

function calc_bounding_box($math, $srch)
{
    $xmm = new MinMax();
    $ymm = new MinMax();
	$converted = array();
	while(!feof($srch)) {
        $line = fgets($srch);
        if (preg_match("/<g transform=\"[^\"]+\" (.*)/", $line, $matches)) {
            $converted[] = "<g {$matches[1]}>";
        } else
        if (preg_match("/<line (.*)/", $line, $matches)) {
            $params = $matches[1];
            if (preg_match("/x1=\"([^\"]+)\"/", $params, $matches))
                $xmm->update($matches[1]);
            if (preg_match("/y1=\"([^\"]+)\"/", $params, $matches))
                $ymm->update($matches[1]);
            if (preg_match("/x2=\"([^\"]+)\"/", $params, $matches))
                $xmm->update($matches[1]);
            if (preg_match("/y2=\"([^\"]+)\"/", $params, $matches))
                $ymm->update($matches[1]);
            $converted[] = $line;
        } else
        if (preg_match("/<polygon points=\"([^\"]+)\"/", $line, $matches)) {
            foreach (explode(" ", $matches[1]) as $p) {
                foreach (explode(",", $p) as $i => $v) {
                    if ($i % 2 == 0) {
                        $xmm->update($v);
                    } else {
                        $ymm->update($v);
                    }
                }
            }
            $converted[] = $line;
        } else
        if (preg_match("/<path d=\"([^\"]+)\"/", $line, $matches)) {
            foreach (explode(" ", $matches[1]) as $c) {
                if (preg_match("/^(M|L|C|S|Q|T)([0-9\\.,]+)/", $c, $matches)) {
                    foreach (explode(",", $matches[2]) as $i => $v) {
                        if ($i % 2 == 0) {
                            $xmm->update($v);
                        } else {
                            $ymm->update($v);
                        }
                    }
                } else
                if (preg_match("/^H([0-9\\.]+)/", $c, $matches)) {
                    $xmm->update($matches[1]);
                } else
                if (preg_match("/^V([0-9\\.]+)/", $c, $matches)) {
                    $ymm->update($matches[1]);
                }
            }
            $converted[] = $line;
        }
    }
	return array( $xmm, $ymm, implode($converted) );
}

function format_svg($math, $srch)
{
    list( $xmm, $ymm, $converted ) = calc_bounding_box($math, $srch);

	$margin= 0.02;
	$scale= 1.35;

    $math_encoded = htmlspecialchars($math);
    $width  = ( $xmm->max() - $xmm->min() + $margin*2 ) * $scale;
    $height = ( $ymm->max() - $ymm->min() + $margin*2 ) * $scale;
    $transx = - ( $xmm->min() - $margin );
    $transy = - ( $ymm->max() + $margin );
    return
    	"<svg width=\"{$width}\" height=\"{$height}\" " .
    	"xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" " .
    	"style=\"vertical-align:middle;\" >\n" .
        "<title>{$math_encoded}</title>\n" .
    	"<g transform=\"scale({$scale},-{$scale}) translate({$transx}, " .
    	"{$transy})\" stroke=\"black\" stroke-linecap=\"butt\" " .
    	"stroke-linejoin=\"miter\" stroke-miterlimit=\"10.433\" " .
    	"stroke-dasharray=\"none\" stroke-dashoffset=\"0\" stroke-opacity=\"1\" " .
    	"fill=\"none\" fill-rule=\"even-odd\" fill-opacity=\"1\" font-style=\"normal\" " .
    	"font-variant=\"normal\" font-weight=\"normal\" font-stretch=\"normal\" " .
    	"font-size-adjust=\"none\" letter-spacing=\"normal\" word-spacing=\"normal\" " .
    	"text-anchor=\"start\">\n" .
    	"{$converted}\n" .
    	"</g></svg>\n";
}

function create_image_files($math, $image_dir, $image_png, $image_svg)
{
    if(!file_exists($image_dir))
        mkdir($image_dir, 0770, true);

    $tmp_dir = sys_get_temp_dir();
    $tmp_base = $tmp_dir . "/pukiwiki_math_plugin" . getmypid();
    $tmp_tex =  $tmp_base . ".tex";
    $tmp_dvi =  $tmp_base . ".dvi";
    $tmp_any =  $tmp_base . ".*";
    try {
        # create tex src
        $texh = fopen($tmp_tex, 'w');
        fwrite($texh, math2tex($math));
        fclose($texh);

        # convert tex to dvi
        system("jlatex -interaction=nonstopmode -output-directory={$tmp_dir} {$tmp_tex} > /dev/null");
        # create png
        system("dvipng -q -bdpi 1440 -o {$image_png} {$tmp_dvi} > /dev/null");
        # create svg
        $pp = popen("dvips -q -Ppdf -E {$tmp_dvi} -o - " .
                    "|pstoedit -q -f plot-svg -dt -sclip -ssp - -", 'r');
        $svg = format_svg($math, $pp);
        pclose($pp);
        # output formatted svg
        $svgh = fopen($image_svg, "w");
        fwrite($svgh, $svg);
        fclose($svgh);
	} catch(Exception $e) {
	    # cleanup temporary files
#        system("rm " . $tmp_any);
        throw $e;
	}
}

function math2html($math)
{
#    if(strlen(encode($math))<40){
#        $image_base = encode($math);
#    }else{
        $image_base = sha1($math);
#    }
    $image_dir = MATHIMG_DIR . "/{$image_base[0]}/{$image_base[1]}";
    $image_png = "{$image_dir}/{$image_base}.png";
    $image_svg = "{$image_dir}/{$image_base}.svg";

    if(!file_exists($image_svg))
        create_image_files($math, $image_dir, $image_png, $image_svg);

    if(use_svg()) {
        $fh = fopen($image_svg, "r");
        $svg = fread($fh, filesize($image_svg));
        fclose($fh);
        return $svg;
    } else {
        list($w, $h) = getimagesize( $image_png );
        $math_encoded = htmlspecialchars($math);
        if($w > 0 && $h > 0){
              return "<img src=\"{$image_png}\" alt=\"{$math_encoded}\" " .
                     "width=\"{$w}\" height=\"{$h}\">";
        }else{
              return "<img src=\"{$image_png}\" alt=\"{$math_encoded}\">";
        }
    }
}

function plugin_math_convert()
{
    return plugin_math_inline();
}

function plugin_math_inline()
{
    $aryargs = func_get_args();
    $math = join(",", $aryargs);
    $math = rtrim($math, ",");  //remove extra comma at the end.
    $html = math2html($math);
    return $html;
}

?>

Counter: 12782 (from 2010/06/03), today: 2, yesterday: 0