217 lines
6.1 KiB
HTML
217 lines
6.1 KiB
HTML
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<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=5,IE=9" ><![endif]-->
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<!DOCTYPE html>
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<!--
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Copyright (c) 2006-2013, JGraph Ltd
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Grid example for mxGraph. This example demonstrates drawing
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a grid dynamically using HTML 5 canvas.
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-->
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<html>
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<head>
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<title>Grid 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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mxEvent.disableContextMenu(document.body);
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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.graphHandler.scaleGrid = true;
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graph.setPanning(true);
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// Enables rubberband selection
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new mxRubberband(graph);
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// Create grid dynamically (requires canvas)
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(function()
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{
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try
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{
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var canvas = document.createElement('canvas');
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canvas.style.position = 'absolute';
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canvas.style.top = '0px';
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canvas.style.left = '0px';
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canvas.style.zIndex = -1;
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graph.container.appendChild(canvas);
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var ctx = canvas.getContext('2d');
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// Modify event filtering to accept canvas as container
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var mxGraphViewIsContainerEvent = mxGraphView.prototype.isContainerEvent;
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mxGraphView.prototype.isContainerEvent = function(evt)
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{
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return mxGraphViewIsContainerEvent.apply(this, arguments) ||
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mxEvent.getSource(evt) == canvas;
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};
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var s = 0;
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var gs = 0;
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var tr = new mxPoint();
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var w = 0;
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var h = 0;
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function repaintGrid()
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{
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if (ctx != null)
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{
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var bounds = graph.getGraphBounds();
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var width = Math.max(bounds.x + bounds.width, graph.container.clientWidth);
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var height = Math.max(bounds.y + bounds.height, graph.container.clientHeight);
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var sizeChanged = width != w || height != h;
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if (graph.view.scale != s || graph.view.translate.x != tr.x || graph.view.translate.y != tr.y ||
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gs != graph.gridSize || sizeChanged)
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{
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tr = graph.view.translate.clone();
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s = graph.view.scale;
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gs = graph.gridSize;
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w = width;
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h = height;
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// Clears the background if required
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if (!sizeChanged)
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{
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ctx.clearRect(0, 0, w, h);
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}
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else
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{
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canvas.setAttribute('width', w);
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canvas.setAttribute('height', h);
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}
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var tx = tr.x * s;
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var ty = tr.y * s;
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// Sets the distance of the grid lines in pixels
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var minStepping = graph.gridSize;
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var stepping = minStepping * s;
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if (stepping < minStepping)
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{
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var count = Math.round(Math.ceil(minStepping / stepping) / 2) * 2;
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stepping = count * stepping;
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}
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var xs = Math.floor((0 - tx) / stepping) * stepping + tx;
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var xe = Math.ceil(w / stepping) * stepping;
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var ys = Math.floor((0 - ty) / stepping) * stepping + ty;
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var ye = Math.ceil(h / stepping) * stepping;
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xe += Math.ceil(stepping);
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ye += Math.ceil(stepping);
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var ixs = Math.round(xs);
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var ixe = Math.round(xe);
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var iys = Math.round(ys);
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var iye = Math.round(ye);
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// Draws the actual grid
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ctx.strokeStyle = '#f6f6f6';
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ctx.beginPath();
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for (var x = xs; x <= xe; x += stepping)
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{
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x = Math.round((x - tx) / stepping) * stepping + tx;
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var ix = Math.round(x);
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ctx.moveTo(ix + 0.5, iys + 0.5);
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ctx.lineTo(ix + 0.5, iye + 0.5);
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}
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for (var y = ys; y <= ye; y += stepping)
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{
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y = Math.round((y - ty) / stepping) * stepping + ty;
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var iy = Math.round(y);
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ctx.moveTo(ixs + 0.5, iy + 0.5);
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ctx.lineTo(ixe + 0.5, iy + 0.5);
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}
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ctx.closePath();
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ctx.stroke();
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}
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}
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};
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}
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catch (e)
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{
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mxLog.show();
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mxLog.debug('Using background image');
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container.style.backgroundImage = 'url(\'editors/images/grid.gif\')';
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}
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var mxGraphViewValidateBackground = mxGraphView.prototype.validateBackground;
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mxGraphView.prototype.validateBackground = function()
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{
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mxGraphViewValidateBackground.apply(this, arguments);
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repaintGrid();
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};
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})();
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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, 30);
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var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
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var e1 = graph.insertEdge(parent, null, '', v1, v2);
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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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graph.centerZoom = false;
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document.body.appendChild(mxUtils.button('+', function()
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{
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graph.zoomIn();
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}));
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document.body.appendChild(mxUtils.button('-', function()
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{
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graph.zoomOut();
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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;width:641px;height:481px;cursor:default;">
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</div>
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</body>
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</html>
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