235 lines
11 KiB
HTML
235 lines
11 KiB
HTML
<!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>Snap Link Reshaping</title>
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<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
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<meta charset="UTF-8">
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<script src="../release/go.js"></script>
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<script src="SnapLinkReshapingTool.js"></script>
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<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
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<script id="code">
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function init() {
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if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
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var $ = go.GraphObject.make; // for conciseness in defining templates
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myDiagram =
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$(go.Diagram, "myDiagramDiv", // must name or refer to the DIV HTML element
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{
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// supply a simple narrow grid that manually reshaped link routes will follow
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grid: $(go.Panel, "Grid",
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{ gridCellSize: new go.Size(8, 8) },
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$(go.Shape, "LineH", { stroke: "lightgray", strokeWidth: 0.5 }),
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$(go.Shape, "LineV", { stroke: "lightgray", strokeWidth: 0.5 })
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),
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allowDrop: true, // must be true to accept drops from the Palette
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"draggingTool.isGridSnapEnabled": true,
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linkReshapingTool: $(SnapLinkReshapingTool),
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// when the user reshapes a Link, change its Link.routing from AvoidsNodes to Orthogonal,
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// so that combined with Link.adjusting == End the link will retain its reshaped mid points
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// even after nodes are moved
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"LinkReshaped": function(e) { e.subject.routing = go.Link.Orthogonal; },
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"animationManager.isEnabled": false,
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"undoManager.isEnabled": true
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});
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// when the document is modified, add a "*" to the title and enable the "Save" button
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myDiagram.addDiagramListener("Modified", function(e) {
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var button = document.getElementById("SaveButton");
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if (button) button.disabled = !myDiagram.isModified;
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var idx = document.title.indexOf("*");
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if (myDiagram.isModified) {
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if (idx < 0) document.title += "*";
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} else {
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if (idx >= 0) document.title = document.title.substr(0, idx);
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}
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});
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// Define a function for creating a "port" that is normally transparent.
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// The "name" is used as the GraphObject.portId, the "spot" is used to control how links connect
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// and where the port is positioned on the node, and the boolean "output" and "input" arguments
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// control whether the user can draw links from or to the port.
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function makePort(name, spot, output, input) {
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// the port is basically just a small transparent square
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return $(go.Shape, "Circle",
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{
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fill: null, // not seen, by default; set to a translucent gray by showSmallPorts, defined below
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stroke: null,
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desiredSize: new go.Size(7, 7),
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alignment: spot, // align the port on the main Shape
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alignmentFocus: spot, // just inside the Shape
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portId: name, // declare this object to be a "port"
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fromSpot: spot, toSpot: spot, // declare where links may connect at this port
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fromLinkable: output, toLinkable: input, // declare whether the user may draw links to/from here
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cursor: "pointer" // show a different cursor to indicate potential link point
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});
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}
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myDiagram.nodeTemplate =
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$(go.Node, "Spot",
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{ locationSpot: go.Spot.Center },
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new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
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{ selectable: true },
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{ resizable: true, resizeObjectName: "PANEL" },
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// the main object is a Panel that surrounds a TextBlock with a Shape
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$(go.Panel, "Auto",
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{ name: "PANEL" },
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new go.Binding("desiredSize", "size", go.Size.parse).makeTwoWay(go.Size.stringify),
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$(go.Shape, "Rectangle", // default figure
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{
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portId: "", // the default port: if no spot on link data, use closest side
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fromLinkable: true, toLinkable: true, cursor: "pointer",
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fill: "white" // default color
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},
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new go.Binding("figure"),
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new go.Binding("fill")),
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$(go.TextBlock,
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{
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font: "bold 11pt Helvetica, Arial, sans-serif",
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margin: 8,
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maxSize: new go.Size(160, NaN),
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wrap: go.TextBlock.WrapFit,
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editable: true
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},
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new go.Binding("text").makeTwoWay())
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),
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// four small named ports, one on each side:
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makePort("T", go.Spot.Top, false, true),
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makePort("L", go.Spot.Left, true, true),
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makePort("R", go.Spot.Right, true, true),
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makePort("B", go.Spot.Bottom, true, false),
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{ // handle mouse enter/leave events to show/hide the ports
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mouseEnter: function(e, node) { showSmallPorts(node, true); },
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mouseLeave: function(e, node) { showSmallPorts(node, false); }
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}
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);
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function showSmallPorts(node, show) {
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node.ports.each(function(port) {
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if (port.portId !== "") { // don't change the default port, which is the big shape
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port.fill = show ? "rgba(0,0,0,.3)" : null;
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}
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});
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}
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myDiagram.linkTemplate =
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$(go.Link, // the whole link panel
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{ relinkableFrom: true, relinkableTo: true, reshapable: true, resegmentable: true },
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{
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routing: go.Link.AvoidsNodes, // but this is changed to go.Link.Orthgonal when the Link is reshaped
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adjusting: go.Link.End,
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curve: go.Link.JumpOver,
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corner: 5,
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toShortLength: 4
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},
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new go.Binding("points").makeTwoWay(),
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// remember the Link.routing too
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new go.Binding("routing", "routing", go.Binding.parseEnum(go.Link, go.Link.AvoidsNodes))
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.makeTwoWay(go.Binding.toString),
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$(go.Shape, // the link path shape
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{ isPanelMain: true, strokeWidth: 2 }),
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$(go.Shape, // the arrowhead
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{ toArrow: "Standard", stroke: null })
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);
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load(); // load an initial diagram from some JSON text
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var link = myDiagram.links.first();
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if (link) link.isSelected = true;
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// initialize the Palette that is on the left side of the page
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myPalette =
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$(go.Palette, "myPaletteDiv", // must name or refer to the DIV HTML element
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{
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maxSelectionCount: 1,
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nodeTemplateMap: myDiagram.nodeTemplateMap, // share the templates used by myDiagram
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model: new go.GraphLinksModel([ // specify the contents of the Palette
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{ text: "Start", figure: "Circle", fill: "green" },
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{ text: "Step" },
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{ text: "DB", figure: "Database", fill: "lightgray" },
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{ text: "???", figure: "Diamond", fill: "lightskyblue" },
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{ text: "End", figure: "Circle", fill: "red" },
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{ text: "Comment", figure: "RoundedRectangle", fill: "lightyellow" }
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])
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});
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}
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// Show the diagram's model in JSON format that the user may edit
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function save() {
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saveDiagramProperties(); // do this first, before writing to JSON
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document.getElementById("mySavedModel").value = myDiagram.model.toJson();
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myDiagram.isModified = false;
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}
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function load() {
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myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
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loadDiagramProperties();
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}
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function saveDiagramProperties() {
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myDiagram.model.modelData.position = go.Point.stringify(myDiagram.position);
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}
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// Called by "InitialLayoutCompleted" DiagramEvent listener, NOT directly by load()!
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function loadDiagramProperties(e) {
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// set Diagram.initialPosition, not Diagram.position, to handle initialization side-effects
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var pos = myDiagram.model.modelData.position;
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if (pos) myDiagram.initialPosition = go.Point.parse(pos);
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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 style="width:100%; white-space:nowrap;">
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<span style="display: inline-block; vertical-align: top; width:105px">
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<div id="myPaletteDiv" style="border: solid 1px black; height: 620px"></div>
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</span>
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<span style="display: inline-block; vertical-align: top; width:80%">
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<div id="myDiagramDiv" style="border: solid 1px black; height: 620px"></div>
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</span>
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</div>
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<p>
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This sample is a simplified version of the <a href="../samples/draggableLink.html">Draggable Link</a> sample.
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Links are not draggable, there are no custom <a>Adornment</a>s, nodes are not rotatable, and links
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do not have text labels.
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</p>
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<p>
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Its purpose is to demonstrate the <a href="SnapLinkReshapingTool.js">SnapLinkReshapingTool</a>,
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an extension of <a>LinkReshapingTool</a> that snaps each dragged reshape handle of selected Links to
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the nearest grid point.
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</p>
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<p>
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Note how the "LinkReshaped" DiagramEvent listener changes the <a>Link.routing</a> of the reshaped Link,
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so that it is no longer AvoidsNodes routing but simple Orthogonal routing.
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This combined with <a>Link.adjusting</a> being End permits the middle points of the link route to be
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retained even after the user moves or resizes nodes.
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Furthermore there is a TwoWay <a>Binding</a> on <a>Link.routing</a>, so that the model remembers
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whether the link route had ever been reshaped manually.
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</p>
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<button id="SaveButton" onclick="save()">Save</button>
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<button onclick="load()">Load</button>
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<textarea id="mySavedModel" style="width:100%;height:300px">
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{ "class": "go.GraphLinksModel",
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"linkFromPortIdProperty": "fromPort",
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"linkToPortIdProperty": "toPort",
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"modelData": {"position":"0 0"},
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"nodeDataArray": [
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{"text":"DB", "figure":"Database", "fill":"lightgray", "key":-3, "loc":"184 176"},
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{"text":"DB", "figure":"Database", "fill":"lightgray", "key":-2, "loc":"248 248"},
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{"text":"DB", "figure":"Database", "fill":"lightgray", "key":-4, "loc":"424 192"},
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{"text":"DB", "figure":"Database", "fill":"lightgray", "key":-5, "loc":"320 152"},
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{"text":"DB", "figure":"Database", "fill":"lightgray", "key":-6, "loc":"424 320"},
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{"text":"DB", "figure":"Database", "fill":"lightgray", "key":-7, "loc":"352 256"},
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{"text":"DB", "figure":"Database", "fill":"lightgray", "key":-8, "loc":"176 296"},
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{"text":"DB", "figure":"Database", "fill":"lightgray", "key":-9, "loc":"288 344"},
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{"text":"Step", "key":-10, "loc":"96 240"},
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{"text":"Step", "key":-11, "loc":"536 280"}
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],
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"linkDataArray": [
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{"from":-10, "to":-11, "fromPort":"R", "toPort":"L", "points":[121,240,131,240,132,240,132,240,216,240,216,176,264,176,264,104,392,104,392,240,480,240,480,280,501,280,511,280], "routing":"Orthogonal"}
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]}
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</textarea>
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</div>
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</body>
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</html>
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