gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta charset="UTF-8">
<title>Scroll Modes GoJS Sample</title>
<meta name="description" content="Infinite scrolling and custom limits on Diagram position and scale." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram = $(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
{
minScale: 0.25, // so that the contents and the grid cannot appear too small
grid: $(go.Panel, "Grid",
$(go.Shape, "LineH", { stroke: "gray", strokeWidth: .5 }),
$(go.Shape, "LineH", { stroke: "darkslategray", strokeWidth: 1.5, interval: 10 }),
$(go.Shape, "LineV", { stroke: "gray", strokeWidth: .5 }),
$(go.Shape, "LineV", { stroke: "darkslategray", strokeWidth: 1.5, interval: 10 })
),
"draggingTool.isGridSnapEnabled": true,
"undoManager.isEnabled": true // enable undo & redo
});
myDiagram.nodeTemplate =
$(go.Node, "Auto", // the Shape will go around the TextBlock
$(go.Shape, "RoundedRectangle", { strokeWidth: 0 },
// Shape.fill is bound to Node.data.color
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 8 }, // some room around the text
// TextBlock.text is bound to Node.data.key
new go.Binding("text", "key"))
);
// create the model data that will be represented by Nodes and Links
myDiagram.model = new go.GraphLinksModel(
[
{ key: "Alpha", color: "lightblue" },
{ key: "Beta", color: "orange" },
{ key: "Gamma", color: "lightgreen" },
{ key: "Delta", color: "pink" }
],
[
{ from: "Alpha", to: "Beta" },
{ from: "Alpha", to: "Gamma" },
{ from: "Beta", to: "Beta" },
{ from: "Gamma", to: "Delta" },
{ from: "Delta", to: "Alpha" }
]);
function positionfunc(diagram, pos) {
var size = diagram.grid.gridCellSize;
return new go.Point(
Math.round(pos.x / size.width) * size.width,
Math.round(pos.y / size.height) * size.height);
}
function scalefunc(diagram, scale) {
var oldscale = diagram.scale;
if (scale > oldscale) {
return oldscale + 0.25;
} else if (scale < oldscale) {
return oldscale - 0.25;
}
return oldscale;
}
var infscroll = document.getElementById('infscroll');
infscroll.addEventListener('change', function(e) {
myDiagram.startTransaction('change scroll mode');
myDiagram.scrollMode = infscroll.checked ? go.Diagram.InfiniteScroll : go.Diagram.DocumentScroll;
myDiagram.commitTransaction('change scroll mode');
});
var poscomp = document.getElementById('poscomp');
poscomp.addEventListener('change', function(e) {
myDiagram.startTransaction('change position computation');
myDiagram.positionComputation = poscomp.checked ? positionfunc : null;
myDiagram.commitTransaction('change position computation');
});
var scalecomp = document.getElementById('scalecomp');
scalecomp.addEventListener('change', function(e) {
myDiagram.startTransaction('change scale computation');
myDiagram.scaleComputation = scalecomp.checked ? scalefunc : null;
myDiagram.commitTransaction('change scale computation');
});
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
<p>
<label><input id="infscroll" type="checkbox" />Enable Infinite Scrolling, setting <a>Diagram.scrollMode</a></label>
<pre>
myDiagram.scrollMode = checked ? go.Diagram.InfiniteScroll : go.Diagram.DocumentScroll;
</pre>
</p>
<p>
<label><input id="poscomp" type="checkbox" />Enable <a>Diagram.positionComputation</a> function</label>
<pre>
function positionfunc(diagram, pos) {
var size = diagram.grid.gridCellSize;
return new go.Point(
Math.round(pos.x / size.width) * size.width,
Math.round(pos.y / size.height) * size.height);
}
</pre>
</p>
<p>
<label><input id="scalecomp" type="checkbox" />Enable <a>Diagram.scaleComputation</a> function</label>
<pre>
function scalefunc(diagram, scale) {
var oldscale = diagram.scale;
if (scale > oldscale) {
return oldscale + 0.25;
} else if (scale < oldscale) {
return oldscale - 0.25;
}
return oldscale;
}
</pre>
</p>
<p>This demonstrates new scrolling and scaling options available in <strong>GoJS 1.5</strong>.</p>
</div>
</body>
</html>