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>Polygon Drawing Tool</title>
<meta name="description" content="The user can draw a new polygon by clicking where its points should go." />
<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 src="PolygonDrawingTool.js"></script>
<script src="GeometryReshapingTool.js"></script>
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make;
myDiagram =
$(go.Diagram, "myDiagramDiv");
myDiagram.toolManager.mouseDownTools.insertAt(3, new GeometryReshapingTool());
myDiagram.nodeTemplateMap.add("PolygonDrawing",
$(go.Node,
{ locationSpot: go.Spot.Center }, // to support rotation about the center
new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
{
selectionAdorned: true, selectionObjectName: "SHAPE",
selectionAdornmentTemplate: // custom selection adornment: a blue rectangle
$(go.Adornment, "Auto",
$(go.Shape, { stroke: "dodgerblue", fill: null }),
$(go.Placeholder, { margin: -1 }))
},
{ resizable: true, resizeObjectName: "SHAPE" },
{ rotatable: true, rotateObjectName: "SHAPE" },
{ reshapable: true }, // GeometryReshapingTool assumes nonexistent Part.reshapeObjectName would be "SHAPE"
$(go.Shape,
{ name: "SHAPE", fill: "lightgray", strokeWidth: 1.5 },
new go.Binding("desiredSize", "size", go.Size.parse).makeTwoWay(go.Size.stringify),
new go.Binding("angle").makeTwoWay(),
new go.Binding("geometryString", "geo").makeTwoWay(),
new go.Binding("fill"),
new go.Binding("stroke"),
new go.Binding("strokeWidth"))
));
// create polygon drawing tool for myDiagram, defined in PolygonDrawingTool.js
var tool = new PolygonDrawingTool();
// provide the default JavaScript object for a new polygon in the model
tool.archetypePartData =
{ fill: "yellow", stroke: "blue", strokeWidth: 3, category: "PolygonDrawing" };
tool.isPolygon = true; // for a polyline drawing tool set this property to false
// install as first mouse-down-tool
myDiagram.toolManager.mouseDownTools.insertAt(0, tool);
load(); // load a simple diagram from the textarea
}
function mode(draw, polygon) {
// assume PolygonDrawingTool is the first tool in the mouse-down-tools list
var tool = myDiagram.toolManager.mouseDownTools.elt(0);
tool.isEnabled = draw;
tool.isPolygon = polygon;
tool.archetypePartData.fill = (polygon ? "yellow" : null);
tool.temporaryShape.fill = (polygon ? "yellow" : null);
}
// this command ends the PolygonDrawingTool
function finish(commit) {
var tool = myDiagram.currentTool;
if (commit && tool instanceof PolygonDrawingTool) {
var lastInput = myDiagram.lastInput;
if (lastInput.event instanceof window.MouseEvent) tool.removeLastPoint(); // remove point from last mouse-down
tool.finishShape();
} else {
tool.doCancel();
}
}
// this command removes the last clicked point from the temporary Shape
function undo() {
var tool = myDiagram.currentTool;
if (tool instanceof PolygonDrawingTool) {
var lastInput = myDiagram.lastInput;
if (lastInput.event instanceof window.MouseEvent) tool.removeLastPoint(); // remove point from last mouse-down
tool.undo();
}
}
function updateAllAdornments() { // called after checkboxes change Diagram.allow...
myDiagram.selection.each(function(p) { p.updateAdornments(); });
}
// save a model to and load a model from Json text, displayed below the Diagram
function save() {
var str = '{ "position": "' + go.Point.stringify(myDiagram.position) + '",\n "model": ' + myDiagram.model.toJson() + ' }';
document.getElementById("mySavedDiagram").value = str;
}
function load() {
var str = document.getElementById("mySavedDiagram").value;
try {
var json = JSON.parse(str);
myDiagram.initialPosition = go.Point.parse(json.position || "0 0");
myDiagram.model = go.Model.fromJson(json.model);
myDiagram.model.undoManager.isEnabled = true;
} catch (ex) {
alert(ex);
}
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width: 100%; height: 350px"></div>
<div id="buttons">
<button onclick="mode(false)">Select</button>
<button onclick="mode(true, true)">Draw Polygon</button>
<button onclick="mode(true, false)">Draw Polyline</button>
<button onclick="finish(true)">Finish Drawing</button>
<button onclick="finish(false)">Cancel Drawing</button>
<button onclick="undo()">Undo Last Point</button>
<br/>
<label><input type="checkbox" onclick="myDiagram.allowResize = !myDiagram.allowResize; updateAllAdornments()" checked="checked" />Allow Resizing</label>
<label><input type="checkbox" onclick="myDiagram.allowReshape = !myDiagram.allowReshape; updateAllAdornments()" checked="checked" />Allow Reshaping</label>
<label><input type="checkbox" onclick="myDiagram.allowRotate = !myDiagram.allowRotate; updateAllAdornments()" checked="checked" />Allow Rotating</label>
</div>
<p>
This sample demonstrates the PolygonDrawingTool, a custom <a>Tool</a> added to the Diagram's mouseDownTools.
It is defined in its own file, as <a href="PolygonDrawingTool.js">PolygonDrawingTool.js</a>.
It also demonstrates the GeometryReshapingTool, another custom tool,
defined in <a href="GeometryReshapingTool.js">GeometryReshapingTool.js</a>.
</p>
<p>
These extensions serve as examples of features that can be added to GoJS by writing new classes.
With the PolygonDrawingTool, a new mode is supported that allows the user to draw custom shapes.
With the GeometryReshapingTool, users can change the geometry (i.e. the "shape") of a <a>Shape</a>s in a selected <a>Node</a>.
<br/>
Click a "Draw" button and then click in the diagram to place a new point in a polygon or polyline shape.
Right-click, double-click, or Enter to finish. Press <b>Escape</b> to cancel, or <b>Z</b> to remove the last point.
Click the "Select" button to switch back to the normal selection behavior, so that you can select, resize, and rotate the shapes.
The checkboxes control whether you can resize, reshape, and/or rotate selected shapes.
</p>
<div>
<button onclick="save()">Save</button>
<button onclick="load()">Load</button>
</div>
<textarea id="mySavedDiagram" style="width:100%;height:300px">
{ "position": "0 0",
"model": { "class": "go.GraphLinksModel",
"nodeDataArray": [ {"loc":"183 148", "category": "PolygonDrawing", "geo":"F M0 145 L75 2 L131 87 L195 0 L249 143z", "key":-1} ],
"linkDataArray": [ ]
} }
</textarea>
</div>
</body>
</html>