DXF File in PHP

DXF, or Drawing Exchange Format, is an open sourced CAD data file format. It was developed by Autodesk in 1982 to enable data interoperability of 2D and 3D drawings between AutoCAD and other programs.

A DXF file is composed of several sections - in the following order:

1. Header contains general information about the drawing.

2. Classes contains application-defined information.

3. Tables contains item definitions.

4. Blocks contains descriptions of entities.

5. Entities contains drawing entities.

6. Objects contains data of non-graphical objects and

7. Thumb-Nail-Image contains preview of image.

Each section has a code that is associated with its value. The code begins with a 0 followed by a string, and ends with a 0 followed by ENDSEC.

DXF Class

 
<?php


define("DXF_COLOR_BYLAYER", 0);
define("DXF_COLOR_BLACK", 250);
define("DXF_COLOR_RED", 1);
define("DXF_COLOR_YELLOW", 2);
define("DXF_COLOR_GREEN", 3);
define("DXF_COLOR_CYAN", 4);
define("DXF_COLOR_BLUE", 5);
define("DXF_COLOR_MAGENTA", 6);
define("DXF_COLOR_WHITE", 7);
define("DXF_COLOR_GRAY", 8);
define("DXF_COLOR_lightGRAY", 9);

class DXFLayer {

   
    function DXFLayer() {
        $this->name = "0";
        $this->color = "0";
        $this->linetype = "CONTINUOUS";
    }

}


class DXF {

    
    function DXF() {
        $this->strDXF = "";
        $this->layers = array();
        $this->ShapeString = "";
    }

   
    function addLayer($name = "0", $color = DXF_COLOR_WHITE, $linetype = "CONTINUOUS") {
        $tmp = new DXFLayer();
        $tmp->name = $name;
        $tmp->color = $color;
        $tmp->linetype = $linetype;
        $this->layers[] = $tmp;
    }

    
    function getString() {
        $strDXF = "";
        $strDXF .= $this->getHeaderString();
        $strDXF .= $this->getBodyString();
        return $strDXF;
    }

    
    function getHeaderString() {
        $strDXF = "";
        $strDXF .= "0\nSECTION\n  2\nHEADER\n  9\n\$ACADVER\n  1\nAC1006\n  0\nENDSEC\n  0\n";
        //layers:
        $strDXF .= "SECTION\n  2\nTABLES\n  0\nTABLE\n2\n";
        $strDXF .= $this->getLayersString();
        $strDXF .= "ENDTAB\n 0\nENDSEC\n";
        return $strDXF;
    }

    
    function getBodyString() {
        $strDXF = "";
        $strDXF .= "0\nSECTION\n2\nENTITIES\n0\n";
        $strDXF .= $this->ShapeString;
        $strDXF .= "ENDSEC\n0\nEOF\n";
        return $strDXF;
    }

    
    function getLayersString() {
        $strDXF = "";
        $strDXF .= "LAYER\n  0\n";
        $count = 1;
        foreach ($this->layers as $layer) {
            $strDXF .= "LAYER\n 2\n" . $layer->name . "\n 70\n 64\n 62\n " . $layer->color . "\n 6\n" . $layer->linetype . "\n 0\n";
            $count++;
        }
        return $strDXF;
    }

    
    function addLine($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .
               "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";
        
        $this->ShapeString .= $str;
        return $str;
    }
    
   
    function addLine1($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .
               
                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";
            
        $this->ShapeString .= $str;
        return $str;
    }
    
     function addLine2($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .
               
                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";
               
        $this->ShapeString .= $str;
        return $str;
    }
    
//     function point($x, $y, $layerName = "0") {
//        $str = "POINT\n" .
//                "8" . "\n" .
//                $layerName . "\n" .
//                "10" . "\n" .
//                $x . "\n" .
//                "20" . "\n" .
//                $y . "\n0\n";
//              
                
//               
//        $this->ShapeString .= $str;
//        return $str;
//    }
    function tri1($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n";
        
                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";
                
        $this->ShapeString .= $str;
        return $str;
    }
function tri2($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    function tri3($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
    function rect1($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .
                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
     function rect2($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
     function rect3($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
     
    function rect4($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
    function pent1($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .
                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
    function pent2($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
    function pent3($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
    function pent4($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
    function pent5($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
      function hex1($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
      function hex2($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
      function hex3($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
      function hex4($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
      function hex5($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
      function hex6($x, $y, $x2, $y2, $layerName = "0") {
        $str = "LINE\n" .
                "8" . "\n" .
                $layerName . "\n" .
                "10" . "\n" .
                $x . "\n" .
                "20" . "\n" .
                $y . "\n" .

                "11" . "\n" .
                $x2 . "\n" .
                "21" . "\n" .
                $y2 . "\n0\n";

        $this->ShapeString .= $str;
        return $str;
    }
    
       function SaveFile($filename) {
        while (false !== ob_get_clean()
        );
        header("Content-Type: image/vnd.dxf");
        header("Content-Disposition: inline; filename=$filename");
        echo $this->getString();
        die();
    }

}

 ?>

Drawing Code

 

<?php

ob_start();
require_once 'dxfwriter.php';
?>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>DXF Writer</title>
    </head>
    <body>
        <pre></pre>
<a href="?download">download dxf</a><br />
        <?php
        $shape = new DXF();
        $shape->addLayer("mylayer", DXF_COLOR_RED);

        $shape->addLine(100, 40, 300, 40,  "mylayer");
        $a=(100+300)/2;
        $b=(200+200)/2;
//         $shape->addLayer("text", DXF_COLOR_GREEN);
//        $shape->point($a, $b, "text"); 
$shape->addLine1($a,$b+120,$a,$b-120,  "mylayer");
$shape->addLine2(100, 200, 300, 200,  "mylayer");

$shape->tri1(400, 100, 300, 300,  "mylayer");
$shape->tri2(400, 100, 500, 300,  "mylayer");
$shape->tri3(300, 300, 500, 300,  "mylayer");
$shape->rect1(50, 300, 250, 300,  "mylayer");
$shape->rect2(250, 300, 250, 500,  "mylayer");

$shape->rect3(250, 500, 50, 500,  "mylayer");
$shape->rect4(50, 500, 50, 300,  "mylayer");
$shape->pent1(290, 600, 200, 530,  "mylayer");
$shape->pent2(200, 530, 110, 600,  "mylayer");
$shape->pent3(110, 600, 145, 710,  "mylayer");
$shape->pent4(145, 710, 255, 710,  "mylayer");
$shape->pent5(255, 710, 290, 600,  "mylayer");
$shape->hex1(300, 850, 250, 750,  "mylayer");
$shape->hex2(250, 750, 150, 750,  "mylayer");
$shape->hex3(150, 750, 100, 850,  "mylayer");
$shape->hex4(100, 850, 150, 950,  "mylayer");
$shape->hex5(150, 950, 250, 950,  "mylayer");
$shape->hex6(250, 950, 300, 850,  "mylayer");


        if (isset($_GET['download']))
        {
            $shape->SaveFile("myFile.dxf");  
//            $shape->SaveFile("rak.dxf"); 
        }
        
        $dxfstring = $shape->getString();
        
        echo "<h2>
dxf string:</h2>
<pre>$dxfstring</pre>
";
        ?>
    </body>
</html>

Output

RAKHI'S BLOG

DXF File in PHP

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