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132
133
<style type="text/css">
@media screen {
  img {
    border: 1px solid rgba(255,0,0,.4);
  }
}
140
/* @media print specifies CSS rules that only apply when printing */
@media print {
  /* CSS reset to clear styles for printing */
  html, body, div {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
  }
152
  /* Hide everything on the page */
  body * {
    display: none;
  }
157
  #container, #content, #myImages, #myImages * {
    /* Only display the images we want printed */
    /* all of the image's parent divs
       leading up to the body must be un-hidden (displayed) too
    */
    display: block;
    /* CSS reset to clear the specific visible divs for printing */
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
  }
172
  /* We have line breaks in the DIV
     to separate the images in the browser,
     but do not want those line breaks when printing
  */
  #myImages br {
    display: none;
  }
180
  #manyImgCode {
    display: none;
  }
184
  #mycss {
    display: none;
  }
188
  img {
    /* Only some browsers respect this rule: */
    page-break-inside: avoid;
    /* Almost all browsers respect this rule: */
    page-break-after:always;
  }
}
196
/* The @page rules specify additional printing directives that browsers may respect
   Here we suggest printing in landscape (instead of portrait) with a small margin.
   Browsers, however, are free to ignore or override these suggestions.
   See also:
    https://developer.mozilla.org/en-US/docs/CSS/@page
    https://dev.w3.org/csswg/css3-page/#at-page-rule
*/
@page {
  /* Some browsers respect rules such as size: landscape */
  margin: 1cm;
}
</style>
209
210
211
212
213<h1>Printing</h1>
214<p>
215Printing a Diagram is typically accomplished by making several images of the Diagram and either saving them, inserting them into a PDF or other document, or printing them directly from the browser. On this page we will create several images out of a large Diagram and prepare some CSS so that printing this page prints only those images.
216</p>
217<p>
218This page uses <a>Diagram.makeImage</a>, which has its own introduction page: <a href="makingImages.html">Making Images with GoJS</a>.
219</p>
220
221<p class="box bg-info">
222Depending on your situation, you may want to use SVG to print instead, and there is also a page on <a href="makingSVG.html">Making SVG with GoJS</a>, which is nearly identical to making images. In this page's examples you could substitute <a>Diagram.makeSvg</a> for the same result.
223</p>
224
225<p>
Below is the Diagram we are going to prepare for print.
227</p>
228<!-- Don't bother showing this source -->
229<pre class="lang-js" id="diag" style="display: none;"><code>
window.myDiagram = diagram;
myDiagram.autoScale = go.Diagram.Uniform;
232
// define the Node template
myDiagram.nodeTemplate =
  $(go.Node, "Spot",
    { locationSpot: go.Spot.Center },
    $(go.Shape, "Rectangle",
      { fill: "lightgray",  // the initial value, but data-binding may provide different value
        stroke: "black",
        desiredSize: new go.Size(30, 30) },
      new go.Binding("fill", "fill")),
    $(go.TextBlock,
      new go.Binding("text", "text"))
  );
245
// define the Link template to be minimal
myDiagram.linkTemplate =
  $(go.Link,
    { selectable: false },
    $(go.Shape));
251
myDiagram.layout = new go.LayeredDigraphLayout();
253
var minNodes = 125, maxNodes = 125;
myDiagram.startTransaction("generateDigraph");
// replace the diagram's model's nodeDataArray
var nodeArray = [];
// get the values from the fields and create a random number of nodes within the range
var min = parseInt(minNodes, 10);
var max = parseInt(maxNodes, 10);
if (isNaN(min)) min = 0;
if (isNaN(max) || max &lt; min) max = min;
var numNodes = Math.floor(Math.random() * (max - min + 1)) + min;
var i;
for (i = 0; i &lt; numNodes; i++) {
  nodeArray.push({
    key: i,
    text: i.toString(),
    fill: go.Brush.randomColor()
  });
}
272
// randomize the node data
for (i = 0; i &lt; nodeArray.length; i++) {
  var swap = Math.floor(Math.random() * nodeArray.length);
  var temp = nodeArray[swap];
  nodeArray[swap] = nodeArray[i];
  nodeArray[i] = temp;
}
280
// set the nodeDataArray to this array of objects
myDiagram.model.nodeDataArray = nodeArray;
// replace the diagram's model's linkDataArray
var linkArray = [];
var nit = myDiagram.nodes;
var nodes = new go.List();
nodes.addAll(nit);
for (var i = 0; i &lt; nodes.count - 1; i++) {
  var from = nodes.elt(i);
  var numto = Math.floor(1 + (Math.random() * 3) / 2);
  for (var j = 0; j &lt; numto; j++) {
    var idx = Math.floor(i + 5 + Math.random() * 10);
    if (idx &gt;= nodes.count) idx = i + (Math.random() * (nodes.count - i)) | 0;
    var to = nodes.elt(idx);
    linkArray.push({ from: from.data.key, to: to.data.key });
  }
}
myDiagram.model.linkDataArray = linkArray;
myDiagram.commitTransaction("generateDigraph");
300
301</code></pre>
302<script>goCode("diag", 500, 500)</script>
303<script>
window.extras = [];
window.goCode3 = function(pre) {
  extras.push(pre);
}
308
window.extra = function() {
  for (var i = 0; i < extras.length; i++) {
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    var pre = document.getElementById(ex);
    var f = eval("(function () {" + pre.textContent + "\n})");
    f();
  }
}
317</script>
318<p>
Our code for print preparation contains a <code>generateImages</code> function that cuts the Diagram into several images of a given width and height. On this page it is called by default with (700, 960), but the width and height can be modified dynamically with HTML inputs below.
320</p>
321<pre class="lang-js" id="manyImgCode"><code>
  // if width or height are below 50, they are set to 50
  function generateImages(width, height) {
    // sanitize input
    width = parseInt(width);
    height = parseInt(height);
    if (isNaN(width)) width = 100;
    if (isNaN(height)) height = 100;
    // Give a minimum size of 50x50
    width = Math.max(width, 50);
    height = Math.max(height, 50);
332
    var imgDiv = document.getElementById('myImages');
    imgDiv.innerHTML = ''; // clear out the old images, if any
    var db = myDiagram.documentBounds;
    var boundswidth = db.width;
    var boundsheight = db.height;
    var imgWidth = width;
    var imgHeight = height;
    var p = db.position;
    for (var i = 0; i &lt; boundsheight; i += imgHeight) {
      for (var j = 0; j &lt; boundswidth; j += imgWidth) {
        var img = myDiagram.makeImage({
          scale: 1,
          position: new go.Point(p.x + j, p.y + i),
          size: new go.Size(imgWidth, imgHeight)
        });
        // Append the new HTMLImageElement to the #myImages div
        img.className = 'images';
        imgDiv.appendChild(img);
        imgDiv.appendChild(document.createElement('br'));
      }
    }
  }
355
  var button = document.getElementById('makeImages');
  button.addEventListener('click', function() {
    var width = parseInt(document.getElementById('widthInput').value);
    var height = parseInt(document.getElementById('heightInput').value);
    generateImages(width, height);
  }, false);
362
  // Call it with some default values
  generateImages(700, 960);
365</code></pre>
366
367<p>
We want to show nothing but the images when this HTML page is printed, so we must use CSS rules to hide all page elements except the images themselves and the DOM parents of the images leading up to the body (#content, #myImages).
369</p>
370<p>
With the CSS below, printing this page will give yield nothing but the generated images that have been added to the end of this page. Typically the image or images used for printing may be hidden from the user completely, except when printing, or else added to a separate page in a new window.
372</p>
373<pre class="lang-css" id="mycss"><code>
374/* @media print specifies CSS rules that only apply when printing */
375@media print {
/* CSS reset to clear styles for printing */
html, body, div {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}
385
/* Hide everything on the page */
body * {
  display: none;
}
390
#content, #myImages, #myImages * {
  /* Only display the images we want printed */
  /* all of the image's parent divs
     leading up to the body must be un-hidden (displayed) too
  */
  display: block;
  /* CSS reset to clear the specific visible divs for printing */
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}
405
/* We have line breaks in the DIV
   to separate the images in the browser,
   but do not want those line breaks when printing
*/
#myImages br {
  display: none;
}
413
img {
  /* Only some browsers respect this rule: */
  page-break-inside: avoid;
  /* Almost all browsers respect this rule: */
  page-break-after:always;
}
420}
421
422/* The @page rules specify additional printing directives that browsers may respect
 Here we suggest printing in landscape (instead of portrait) with a small margin.
 Browsers, however, are free to ignore or override these suggestions.
 See also:
  https://developer.mozilla.org/en-US/docs/CSS/@page
  https://dev.w3.org/csswg/css3-page/#at-page-rule
428*/
429@page {
/* Some browsers respect rules such as size: landscape */
margin: 1cm;
432}
433</code></pre>
434<p>
The images at the end of this page are generated by calling <code>generateImages(700, 960)</code>. Using the inputs below the images can be replaced with those of a different size. Different papers, page orientations, and margins will require different sized images if they are to fill the paper, and (700, 960) is a suggested size for 8.5 inch by 11 paper in portrait orientation, with minimal margins.
436</p>
437<div style="border: 1px solid gray; padding: 10px; margin-bottom: 20px;">
438Width: <input id="widthInput" value="700" />
439Height: <input id="heightInput" value="960" />
440<button id="makeImages">Generate images for printing</button>
441</div>
442<div id="myImages">
443</div>
444<script>goCode3('manyImgCode');</script>
445
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6
7	`<link rel="stylesheet" href="../assets/css/style.css"/>`
8	`<!-- Copyright 1998-2021 by Northwoods Software Corporation. --> <title> GoJS Printing -- Northwoods Software </title>`
9	`<link rel="stylesheet" href="../assets/css/prism.css" />`
10	`</head>`
11	`<script>`
12
13	`window.diagrams = [];`
14	`window.goCode = function(pre, w, h, parentid, animation) {`
15	`window.diagrams.push([pre, w, h, parentid, animation]);`
16	`}`
17	`</script>`
18	`<body>`
19	`<nav id="navTop" class="w-full z-30 top-0 text-white bg-nwoods-primary">`
20	`<div class="w-full container max-w-screen-lg mx-auto flex flex-wrap sm:flex-nowrap items-center justify-between mt-0 py-2">`
21	`<div class="md:pl-4">`
22	`<a class="text-white hover:text-white no-underline hover:no-underline`
23	`font-bold text-2xl lg:text-4xl rounded-lg hover:bg-nwoods-secondary " href="../">`
24	`<h1 class="mb-0 p-1 ">GoJS</h1>`
25	`</a>`
26	`</div>`
27	`<button id="topnavButton" class="rounded-lg sm:hidden focus:outline-none focus:ring" aria-label="Navigation">`
28	`<svg fill="currentColor" viewBox="0 0 20 20" class="w-6 h-6">`
29	`<path id="topnavOpen" fill-rule="evenodd" d="M3 5a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zM3 10a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zM9 15a1 1 0 011-1h6a1 1 0 110 2h-6a1 1 0 01-1-1z" clip-rule="evenodd"></path>`
30	`<path id="topnavClosed" class="hidden" fill-rule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clip-rule="evenodd"></path>`
31	`</svg>`
32	`</button>`
33	`<div id="topnavList" class="hidden sm:block items-center w-auto mt-0 text-white p-0 z-20">`
34	`<ul class="list-reset list-none font-semibold flex justify-end flex-wrap sm:flex-nowrap items-center px-0 pb-0">`
35	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../learn/">Learn</a></li>`
36	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../samples/">Samples</a></li>`
37	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../intro/">Intro</a></li>`
38	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../api/">API</a></li>`
39	`<li class="p-1 sm:p-0"><a class="topnav-link" href="https://www.nwoods.com/products/register.html">Register</a></li>`
40	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../download.html">Download</a></li>`