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189 lines
7.7 KiB
HTML
Executable File
189 lines
7.7 KiB
HTML
Executable File
<!DOCTYPE html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Minimal GoJS Sample Generating PDF</title>
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<meta name="description" content="A simple demonstration of generating a PDF file in the browser, showing it in the page, and downloading it as a file." />
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<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
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<meta charset="UTF-8">
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<script src="https://unpkg.com/gojs"></script>
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<script src="../../samples/assets/require.js"></script>
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<script id="code">
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// This just creates and initializes a Diagram.\
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// The details do not really matter for this demo.
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function init() {
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var $ = go.GraphObject.make;
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myDiagram = $(go.Diagram, "myDiagramDiv",
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{
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"undoManager.isEnabled": true,
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"grid.visible": true
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});
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myDiagram.nodeTemplate =
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$(go.Node, "Auto",
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$(go.Shape, "RoundedRectangle",
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{ strokeWidth: 0, fill: "white" },
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new go.Binding("fill", "color")),
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$(go.TextBlock,
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{ margin: 8 },
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new go.Binding("text", "key"))
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);
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myDiagram.model = new go.GraphLinksModel(
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[
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{ key: "Alpha", color: "lightblue" },
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{ key: "Beta", color: "orange" },
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{ key: "Gamma", color: "lightgreen" },
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{ key: "Delta", color: "pink" }
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],
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[
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{ from: "Alpha", to: "Beta" },
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{ from: "Alpha", to: "Gamma" },
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{ from: "Beta", to: "Beta" },
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{ from: "Gamma", to: "Delta" },
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{ from: "Delta", to: "Alpha" }
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]);
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}
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// This common function is called both when showing the PDF in an iframe and when downloading a PDF file.
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// The options include:
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// "pageSize", either "A4" or "LETTER" (the default)
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// "layout", either "portrait" (the default) or "landscape"
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// "margin" for the uniform page margin on each page (default is 36 pt)
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// "padding" instead of the Diagram.padding when adjusting the Diagram.documentBounds for the area to render
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// "imgWidth", size of diagram image for one page; defaults to the page width minus margins
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// "imgHeight", size of diagram image for one page; defaults to the page height minus margins
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// "imgResolutionFactor" for how large the image should be scaled when rendered for each page;
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// larger is better but significantly increases memory usage (default is 3)
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// "parts", "background", "showTemporary", "showGrid", all are passed to Diagram.makeImageData
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function generatePdf(action, diagram, options) {
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if (!(diagram instanceof go.Diagram)) throw new Error("no Diagram provided when calling generatePdf");
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if (!options) options = {};
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var pageSize = options.pageSize || "LETTER";
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pageSize = pageSize.toUpperCase();
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if (pageSize !== "LETTER" && pageSize !== "A4") throw new Error("unknown page size: " + pageSize);
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// LETTER: 612x792 pt == 816x1056 CSS units
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// A4: 595.28x841.89 pt == 793.71x1122.52 CSS units
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var pageWidth = (pageSize === "LETTER" ? 612 : 595.28) * 96 / 72; // convert from pt to CSS units
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var pageHeight = (pageSize === "LETTER" ? 792 : 841.89) * 96 / 72;
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var layout = options.layout || "portrait";
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layout = layout.toLowerCase();
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if (layout !== "portrait" && layout !== "landscape") throw new Error("unknown layout: " + layout);
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if (layout === "landscape") {
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var temp = pageWidth;
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pageWidth = pageHeight;
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pageHeight = temp;
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}
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var margin = options.margin !== undefined ? options.margin : 36; // pt: 0.5 inch margin on each side
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var padding = options.padding !== undefined ? options.padding : diagram.padding; // CSS units
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var imgWidth = options.imgWidth !== undefined ? options.imgWidth : (pageWidth-margin/72*96*2); // CSS units
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var imgHeight = options.imgHeight !== undefined ? options.imgHeight : (pageHeight-margin/72*96*2); // CSS units
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var imgResolutionFactor = options.imgResolutionFactor !== undefined ? options.imgResolutionFactor : 3;
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var pageOptions = {
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size: pageSize,
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margin: margin, // pt
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layout: layout
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};
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require(["blob-stream", "pdfkit"], function(blobStream, PDFDocument) {
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var doc = new PDFDocument(pageOptions);
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var stream = doc.pipe(blobStream());
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var bnds = diagram.documentBounds;
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// add some descriptive text
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//doc.text(diagram.nodes.count + " nodes, " + diagram.links.count + " links Diagram size: " + bnds.width.toFixed(2) + " x " + bnds.height.toFixed(2));
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var db = diagram.documentBounds.copy().subtractMargin(diagram.padding).addMargin(padding);
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var p = db.position;
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// iterate over page areas of document bounds
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for (var j = 0; j < db.height; j += imgHeight) {
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for (var i = 0; i < db.width; i += imgWidth) {
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// if any page has no Parts partially or fully in it, skip rendering that page
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var r = new go.Rect(p.x + i, p.y + j, imgWidth, imgHeight);
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if (diagram.findPartsIn(r, true, false).count === 0) continue;
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if (i > 0 || j > 0) doc.addPage(pageOptions);
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var makeOptions = {};
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if (options.parts !== undefined) makeOptions.parts = options.parts;
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if (options.background !== undefined) makeOptions.background = options.background;
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if (options.showTemporary !== undefined) makeOptions.showTemporary = options.showTemporary;
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if (options.showGrid !== undefined) makeOptions.showGrid = options.showGrid;
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makeOptions.scale = imgResolutionFactor;
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makeOptions.position = new go.Point(p.x + i, p.y + j);
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makeOptions.size = new go.Size(imgWidth*imgResolutionFactor, imgHeight*imgResolutionFactor);
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makeOptions.maxSize = new go.Size(Infinity, Infinity);
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var imgdata = diagram.makeImageData(makeOptions);
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doc.image(imgdata, { scale: 1/(imgResolutionFactor*96/72) });
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}
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}
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doc.end();
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stream.on('finish', function() { action(stream.toBlob('application/pdf')); });
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});
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}
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// Two different uses of generatePdf: one shows the PDF document in the page,
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// the other downloads it as a file and the user specifies where to save it.
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var pdfOptions = // shared by both ways of generating PDF
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{
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showTemporary: true, // default is false
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// layout: "landscape", // instead of "portrait"
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// pageSize: "A4" // instead of "LETTER"
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};
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function showPdf() {
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generatePdf(function(blob) {
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var datauri = window.URL.createObjectURL(blob);
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var frame = document.getElementById("myFrame");
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if (frame) {
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frame.style.display = "block";
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frame.src = datauri; // doesn't work in IE 11, but works everywhere else
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setTimeout(function() { window.URL.revokeObjectURL(datauri); }, 1);
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}
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}, myDiagram, pdfOptions);
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}
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function downloadPdf() {
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generatePdf(function(blob) {
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var datauri = window.URL.createObjectURL(blob);
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var a = document.createElement("a");
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a.style = "display: none";
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a.href = datauri;
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a.download = "myDiagram.pdf";
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if (window.navigator.msSaveBlob !== undefined) { // IE 11 & Edge
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window.navigator.msSaveBlob(blob, a.download);
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window.URL.revokeObjectURL(datauri);
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return;
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}
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document.body.appendChild(a);
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requestAnimationFrame(function() {
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a.click();
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window.URL.revokeObjectURL(datauri);
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document.body.removeChild(a);
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});
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}, myDiagram, pdfOptions);
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}
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</script>
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</head>
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<body onload="init()">
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<div id="sample">
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<div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
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<div><button onclick="showPdf()">Show PDF</button> <button onclick="downloadPdf()">Download PDF</button></div>
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<iframe id="myFrame" style="display:none; width:1000px; height:1000px"></iframe>
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</div>
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</body>
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</html> |