227 lines
7.9 KiB
HTML
227 lines
7.9 KiB
HTML
<!--
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Copyright (c) 2006-2013, JGraph Ltd
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Fixed points example for mxGraph. This example demonstrates using
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fixed connection points for connecting edges to vertices.
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-->
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<html>
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<head>
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<title>Fixed points example for mxGraph</title>
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<!-- Sets the basepath for the library if not in same directory -->
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<script type="text/javascript">
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mxBasePath = '../src';
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</script>
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<!-- Loads and initializes the library -->
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<script type="text/javascript" src="../src/js/mxClient.js"></script>
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<!-- Example code -->
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<script type="text/javascript">
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// Program starts here. Creates a sample graph in the
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// DOM node with the specified ID. This function is invoked
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// from the onLoad event handler of the document (see below).
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function main(container)
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{
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// Checks if the browser is supported
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if (!mxClient.isBrowserSupported())
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{
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// Displays an error message if the browser is not supported.
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mxUtils.error('Browser is not supported!', 200, false);
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}
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else
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{
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// Snaps to fixed points
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mxConstraintHandler.prototype.intersects = function(icon, point, source, existingEdge)
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{
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return (!source || existingEdge) || mxUtils.intersects(icon.bounds, point);
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};
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// Special case: Snaps source of new connections to fixed points
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// Without a connect preview in connectionHandler.createEdgeState mouseMove
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// and getSourcePerimeterPoint should be overriden by setting sourceConstraint
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// sourceConstraint to null in mouseMove and updating it and returning the
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// nearest point (cp) in getSourcePerimeterPoint (see below)
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var mxConnectionHandlerUpdateEdgeState = mxConnectionHandler.prototype.updateEdgeState;
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mxConnectionHandler.prototype.updateEdgeState = function(pt, constraint)
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{
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if (pt != null && this.previous != null)
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{
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var constraints = this.graph.getAllConnectionConstraints(this.previous);
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var nearestConstraint = null;
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var dist = null;
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for (var i = 0; i < constraints.length; i++)
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{
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var cp = this.graph.getConnectionPoint(this.previous, constraints[i]);
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if (cp != null)
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{
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var tmp = (cp.x - pt.x) * (cp.x - pt.x) + (cp.y - pt.y) * (cp.y - pt.y);
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if (dist == null || tmp < dist)
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{
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nearestConstraint = constraints[i];
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dist = tmp;
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}
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}
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}
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if (nearestConstraint != null)
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{
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this.sourceConstraint = nearestConstraint;
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}
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// In case the edge style must be changed during the preview:
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// this.edgeState.style['edgeStyle'] = 'orthogonalEdgeStyle';
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// And to use the new edge style in the new edge inserted into the graph,
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// update the cell style as follows:
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//this.edgeState.cell.style = mxUtils.setStyle(this.edgeState.cell.style, 'edgeStyle', this.edgeState.style['edgeStyle']);
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}
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mxConnectionHandlerUpdateEdgeState.apply(this, arguments);
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};
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// Creates the graph inside the given container
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var graph = new mxGraph(container);
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graph.setConnectable(true);
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//graph.connectionHandler.connectImage = new mxImage('images/connector.gif', 16, 16);
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// Disables floating connections (only use with no connect image)
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if (graph.connectionHandler.connectImage == null)
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{
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graph.connectionHandler.isConnectableCell = function(cell)
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{
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return false;
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};
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mxEdgeHandler.prototype.isConnectableCell = function(cell)
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{
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return graph.connectionHandler.isConnectableCell(cell);
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};
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}
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graph.getAllConnectionConstraints = function(terminal)
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{
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if (terminal != null && this.model.isVertex(terminal.cell))
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{
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return [new mxConnectionConstraint(new mxPoint(0, 0), true),
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new mxConnectionConstraint(new mxPoint(0.5, 0), true),
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new mxConnectionConstraint(new mxPoint(1, 0), true),
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new mxConnectionConstraint(new mxPoint(0, 0.5), true),
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new mxConnectionConstraint(new mxPoint(1, 0.5), true),
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new mxConnectionConstraint(new mxPoint(0, 1), true),
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new mxConnectionConstraint(new mxPoint(0.5, 1), true),
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new mxConnectionConstraint(new mxPoint(1, 1), true)];
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}
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return null;
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};
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// Connect preview
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graph.connectionHandler.createEdgeState = function(me)
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{
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var edge = graph.createEdge(null, null, null, null, null, 'edgeStyle=orthogonalEdgeStyle');
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return new mxCellState(this.graph.view, edge, this.graph.getCellStyle(edge));
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};
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// Enables rubberband selection
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new mxRubberband(graph);
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// Gets the default parent for inserting new cells. This
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// is normally the first child of the root (ie. layer 0).
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var parent = graph.getDefaultParent();
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// Adds cells to the model in a single step
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graph.getModel().beginUpdate();
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try
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{
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var v1 = graph.insertVertex(parent, null, 'Hello,', 20, 20, 80, 60,
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'shape=triangle;perimeter=trianglePerimeter');
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var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 60,
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'shape=ellipse;perimeter=ellipsePerimeter');
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var v3 = graph.insertVertex(parent, null, 'Hello,', 200, 20, 80, 30);
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var e1 = graph.insertEdge(parent, null, '', v1, v2,
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'edgeStyle=elbowEdgeStyle;elbow=horizontal;'+
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'exitX=0.5;exitY=1;exitPerimeter=1;entryX=0;entryY=0;entryPerimeter=1;');
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var e2 = graph.insertEdge(parent, null, '', v3, v2,
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'edgeStyle=elbowEdgeStyle;elbow=horizontal;orthogonal=0;'+
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'entryX=0;entryY=0;entryPerimeter=1;');
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}
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finally
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{
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// Updates the display
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graph.getModel().endUpdate();
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}
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}
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// Use this code to snap the source point for new connections without a connect preview,
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// ie. without an overridden graph.connectionHandler.createEdgeState
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/*
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var mxConnectionHandlerMouseMove = mxConnectionHandler.prototype.mouseMove;
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mxConnectionHandler.prototype.mouseMove = function(sender, me)
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{
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this.sourceConstraint = null;
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mxConnectionHandlerMouseMove.apply(this, arguments);
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};
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var mxConnectionHandlerGetSourcePerimeterPoint = mxConnectionHandler.prototype.getSourcePerimeterPoint;
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mxConnectionHandler.prototype.getSourcePerimeterPoint = function(state, pt, me)
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{
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var result = null;
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if (this.previous != null && pt != null)
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{
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var constraints = this.graph.getAllConnectionConstraints(this.previous);
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var nearestConstraint = null;
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var nearest = null;
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var dist = null;
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for (var i = 0; i < constraints.length; i++)
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{
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var cp = this.graph.getConnectionPoint(this.previous, constraints[i]);
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if (cp != null)
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{
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var tmp = (cp.x - pt.x) * (cp.x - pt.x) + (cp.y - pt.y) * (cp.y - pt.y);
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if (dist == null || tmp < dist)
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{
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nearestConstraint = constraints[i];
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nearest = cp;
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dist = tmp;
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}
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}
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}
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if (nearestConstraint != null)
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{
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this.sourceConstraint = nearestConstraint;
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result = nearest;
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}
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}
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if (result == null)
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{
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result = mxConnectionHandlerGetSourcePerimeterPoint.apply(this, arguments);
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}
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return result;
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};
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*/
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};
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</script>
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</head>
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<!-- Page passes the container for the graph to the program -->
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<body onload="main(document.getElementById('graphContainer'))">
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<!-- Creates a container for the graph with a grid wallpaper -->
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<div id="graphContainer"
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style="overflow:hidden;position:relative;width:321px;height:241px;background:url('editors/images/grid.gif');cursor:default;">
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</div>
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</body>
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</html>
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