markgojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Drawing Commands</title>
<meta name="description" content="A demonstration of the DrawCommandHandler extension." />
<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script src="DrawCommandHandler.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; // for conciseness in defining templates
myDiagram = $(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
{
initialContentAlignment: go.Spot.Center, // center the content
commandHandler: new DrawCommandHandler(), // defined in DrawCommandHandler.js
"undoManager.isEnabled": true // enable undo & redo
});
// define a simple Node template
myDiagram.nodeTemplate =
$(go.Node, "Auto", // the Shape will go around the TextBlock
{ locationSpot: go.Spot.Center },
$(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"))
);
// but use the default Link template, by not setting Diagram.linkTemplate
// 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 askSpace() {
var space = prompt("Desired space between nodes (in pixels):", "0");
return space;
}
// update arrowkey function
function arrowMode() {
// no transaction needed, because we are modifying the CommandHandler for future use
var move = document.getElementById("move");
var select = document.getElementById("select");
var scroll = document.getElementById("scroll");
if (move.checked === true) {
myDiagram.commandHandler.arrowKeyBehavior = "move";
} else if (select.checked === true) {
myDiagram.commandHandler.arrowKeyBehavior = "select";
} else if (scroll.checked === true) {
myDiagram.commandHandler.arrowKeyBehavior = "scroll";
}
}
</script>
</head>
<body onload="init()">
<div id="sample">
<!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
Also add a border to help see the edges. -->
<div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
<p>
Align:
<button onclick="myDiagram.commandHandler.alignLeft()">Left Sides</button>
<button onclick="myDiagram.commandHandler.alignRight()">Right Sides</button>
<button onclick="myDiagram.commandHandler.alignTop()">Tops</button>
<button onclick="myDiagram.commandHandler.alignBottom()">Bottoms</button>
<button onclick="myDiagram.commandHandler.alignCenterX()">Center X</button>
<button onclick="myDiagram.commandHandler.alignCenterY()">Center Y</button>
<button onclick="myDiagram.commandHandler.alignRow(askSpace())">Row</button>
<button onclick="myDiagram.commandHandler.alignColumn(askSpace())">Column</button>
</br>
Rotate:
<button onclick="myDiagram.commandHandler.rotate(45)">45°</button>
<button onclick="myDiagram.commandHandler.rotate(-45)">-45°</button>
<button onclick="myDiagram.commandHandler.rotate(90)">90°</button>
<button onclick="myDiagram.commandHandler.rotate(-90)">-90°</button>
<button onclick="myDiagram.commandHandler.rotate(180)">180°</button>
</br>
Arrow Mode:
<input type="radio" name="arrow" id="move" onclick="arrowMode()" checked="checked">Move</input>
<input type="radio" name="arrow" id="select" onclick="arrowMode()">Select</input>
<input type="radio" name="arrow" id="scroll" onclick="arrowMode()">Scroll</input>
</p>
<p>
This example demonstrates a custom <a>CommandHandler</a>.
It allows the user to position selected Parts in a diagram relative to each other,
overrides <a>CommandHandler.doKeyDown</a> to allow handling the arrow keys in additional manners,
and uses a "paste offset" so that pasting objects will cascade them rather than place them on top of one another.
It is defined in its own file, as <a href="DrawCommandHandler.js">DrawCommandHandler.js</a>.
</p>
<p>
The above buttons can be used to align Parts, rotate Parts, or change the behavior of the arrow keys.
</p>
<p>
Usage can also be seen in the <a href="BPMN.html">BPMN Editor</a> sample.
</p>
</div>
</body>
</html>