create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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<div class="px-4 pb-16 w-full overflow-hidden prose">
<h1>Printing</h1>
<p>
Printing 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 a separate window holding those images.
That window is what is actually printed.
</p>
<p>
This page uses <a>Diagram.makeSvg</a>, which has its own introduction page: <a href="makingSVG.html">Making Images with GoJS</a>.
Depending on your situation, you may want to use raster images to print by calling <a>Diagram.makeImage</a> instead.
</p>
<p>
Below is the Diagram we are going to prepare for printing, scaled down to fit on this page.
</p>
<!-- Don't bother showing this source -->
<pre class="lang-js" id="diag" style="display: none"><code>
window.myDiagram = diagram;
myDiagram.autoScale = go.AutoScale.Uniform;
// define the Node template
myDiagram.nodeTemplate =
new go.Node("Spot", { locationSpot: go.Spot.Center })
.add(
new go.Shape("Rectangle",
{ fill: "lightgray", // the initial value, but data-binding may provide different value
stroke: "black",
desiredSize: new go.Size(30, 30) })
.bind("fill"),
new go.TextBlock()
.bind("text")
);
// define the Link template to be minimal
myDiagram.linkTemplate =
new go.Link({ selectable: false })
.add(new go.Shape());
myDiagram.layout = new go.LayeredDigraphLayout();
const minNodes = 125, maxNodes = 125;
myDiagram.startTransaction("generateDigraph");
// replace the diagram's model's nodeDataArray
const nodeArray = [];
// get the values from the fields and create a random number of nodes within the range
let min = parseInt(minNodes, 10);
let max = parseInt(maxNodes, 10);
if (isNaN(min)) min = 0;
if (isNaN(max) || max < min) max = min;
const numNodes = Math.floor(Math.random() * (max - min + 1)) + min;
for (let i = 0; i < numNodes; i++) {
nodeArray.push({
key: i,
text: i.toString(),
fill: go.Brush.randomColor()
});
}
// randomize the node data
for (let i = 0; i < nodeArray.length; i++) {
const swap = Math.floor(Math.random() * nodeArray.length);
const temp = nodeArray[swap];
nodeArray[swap] = nodeArray[i];
nodeArray[i] = temp;
}
// set the nodeDataArray to this array of objects
myDiagram.model.nodeDataArray = nodeArray;
// replace the diagram's model's linkDataArray
const linkArray = [];
const nit = myDiagram.nodes;
const nodes = new go.List();
nodes.addAll(nit);
for (let i = 0; i < nodes.count - 1; i++) {
const from = nodes.elt(i);
const numto = Math.floor(1 + (Math.random() * 3) / 2);
for (let j = 0; j < numto; j++) {
let idx = Math.floor(i + 5 + Math.random() * 10);
if (idx >= nodes.count) idx = i + (Math.random() * (nodes.count - i)) | 0;
const to = nodes.elt(idx);
linkArray.push({ from: from.data.key, to: to.data.key });
}
}
myDiagram.model.linkDataArray = linkArray;
myDiagram.commitTransaction("generateDigraph");
// print the diagram by opening a new window holding SVG images of the diagram contents for each page
function printDiagram(width, height) {
if (!width) width = 700;
if (!height) height = 960;
const svgWindow = window.open();
if (!svgWindow) return; // failure to open a new Window
svgWindow.document.title = "GoJS Flowchart";
svgWindow.document.body.style.margin = "0px";
const printSize = new go.Size(width, height);
const bnds = myDiagram.documentBounds;
let x = bnds.x;
let y = bnds.y;
while (y < bnds.bottom) {
while (x < bnds.right) {
const svg = myDiagram.makeSvg({
scale: 1.0,
position: new go.Point(x, y),
size: printSize,
background: myDiagram.div.style.background
});
svgWindow.document.body.appendChild(svg);
x += printSize.width;
}
x = bnds.x;
y += printSize.height;
}
setTimeout(() => { svgWindow.print(); svgWindow.close(); }, 1);
}
window.printDiagram = printDiagram;
</code></pre>
<script>
goCode('diag', 500, 500);
</script>
<p>
Our code for print preparation is in a <code>printDiagram</code> function that cuts the Diagram into several images
of a given width and height and renders each such page individually.
Those images are in a separate window just to make it easier to manage than combining them with the contents of this page.
</p>
<pre class="lang-js" id="manyImgCode"><code>
// print the diagram by opening a new window holding SVG images of the diagram contents for each page
function printDiagram(width, height) {
if (!width) width = 700;
if (!height) height = 960;
const svgWindow = window.open();
if (!svgWindow) return; // failure to open a new Window
svgWindow.document.title = "GoJS Printing";
svgWindow.document.body.style.margin = "0px";
const printSize = new go.Size(width, height);
const bnds = myDiagram.documentBounds;
let x = bnds.x;
let y = bnds.y;
while (y < bnds.bottom) {
while (x < bnds.right) {
const svg = myDiagram.makeSvg({
scale: 1.0,
position: new go.Point(x, y),
size: printSize,
background: myDiagram.themeManager.findValue('div', 'colors'),
});
svgWindow.document.body.appendChild(svg);
x += printSize.width;
}
x = bnds.x;
y += printSize.height;
}
setTimeout(() => { svgWindow.print(); svgWindow.close(); }, 1);
}
</code></pre>
<button onclick="window.printDiagram(700, 960)">Print Diagram (portrait)</button>
<button onclick="window.printDiagram(960, 700)">Print Diagram (landscape)</button>
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