function showUmlImage($json)
{
    $title = "View As UML Image";
    $icon = "png.png";
    ?>
  <html>
  <head>
    <title> <?php 
    echo $title;
    ?>
 </title>
    <link rel="shortcut icon" href=<?php 
    echo $icon;
    ?>
 type="image/x-icon" />
  </head>
  </html>
  <?php 
    header("Content-type: image/png");
    require_once "canvas.php";
    $canvas = new Canvas(950, 350);
    $diagram = $canvas->createDiagram();
    $classIds = array();
    foreach ($json->umpleClasses as $umpleClass) {
        $umplePosition = $umpleClass->position;
        $classEntity = new ClassEntity($umpleClass->name, new Position($umplePosition->x, $umplePosition->y, $umplePosition->width, $umplePosition->height));
        $classIds[$umpleClass->id] = $classEntity;
        $classEntity->draw($diagram);
    }
    foreach ($json->umpleAssociations as $umpleAssociation) {
        $classEntity1 = $classIds[$umpleAssociation->classOneId];
        $classEntity2 = $classIds[$umpleAssociation->classTwoId];
        $mult1 = new MultiplicityEnd($classEntity1);
        $mult2 = new MultiplicityEnd($classEntity2);
        $association = new Association($mult1, $mult2);
        $c1Position = $classEntity1->getPosition();
        $c1Offset = $umpleAssociation->offsetOnePosition;
        $c2Position = $classEntity2->getPosition();
        $c2Offset = $umpleAssociation->offsetTwoPosition;
        $p1 = new Point($c1Position->getX() + $c1Offset->x, $c1Position->getY() + $c1Offset->y);
        $p2 = new Point($c2Position->getX() + $c2Offset->x, $c2Position->getY() + $c2Offset->y);
        $association->addConnector($p1);
        $association->addConnector($p2);
        $association->draw($diagram);
    }
    ImagePng($diagram);
    ImageDestroy($diagram);
}