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132
133<h1>Nodes</h1>
134<p>
135You can customize your nodes to have exactly the appearance and behavior that you want.
136So far you have only seen very simple nodes.
137But if you have seen the <a href="../samples/index.html">Sample Applications</a>,
138you have seen many other kinds of nodes.
139</p>
140<p>
141In this page we demonstrate some of the choices you can make when designing your nodes.
142</p>
143
144<h2 id="SurroundingContent">Surrounding Content</h2>
145<p>
146It is common to surround interesting information with a border or other background.
147</p>
148<h3 id="SimpleBorders">Simple borders</h3>
149<p>
150Many of the simplest nodes just consist of a <a>Panel</a> of type <a>Panel,Auto</a> with a <a>Shape</a>
151surrounding a <a>TextBlock</a>.
152</p>
153<pre class="lang-js" id="border"><code>
diagram.nodeTemplate =
  $(go.Node, "Auto",
    $(go.Shape, "Rectangle",
      new go.Binding("fill", "color")),
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key"))
  );
162
diagram.model.nodeDataArray = [
  { key: "Alpha", color: "lightblue" }
];
166</code></pre>
167<script>goCode("border", 300, 150)</script>
168
169<h3 id="ShapedNodes">Shaped nodes</h3>
170<p>
171The Shape surrounding the content need not be rectangular.
172This example demonstrates a number of shapes.
173</p>
174<pre class="lang-js" id="shapes"><code>
diagram.nodeTemplate =
  $(go.Node, "Auto",
    $(go.Shape,
      new go.Binding("figure", "fig"),
      new go.Binding("fill", "color")),
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key"))
  );
184
diagram.model.nodeDataArray = [
  { key: "Alpha", color: "lightblue", fig: "RoundedRectangle" },
  { key: "Beta", color: "lightblue", fig: "Ellipse" },
  { key: "Gamma", color: "lightblue", fig: "Hexagon" },
  { key: "Delta", color: "lightblue", fig: "FramedRectangle" },
  { key: "Epsilon", color: "lightblue", fig: "Cloud" },
  { key: "Zeta", color: "lightblue", fig: "Procedure" }
];
193</code></pre>
194<script>goCode("shapes", 300, 150)</script>
195<p>
196The surrounding/background object need not be a <a>Shape</a>.
197You could use a <a>Picture</a> or even a more complex object such as a <a>Panel</a>.
198</p>
199
200<h3 id="ComplexContents">Complex contents</h3>
201<p>
202The content of an Auto <a>Panel</a> need not be limited to a single <a>TextBlock</a> --
203you can have arbitrarily complex panels of objects.
204In this example the content is a Table Panel with three rows of TextBlocks.
205</p>
206<pre class="lang-js" id="borderedtable"><code>
diagram.nodeTemplate =
  $(go.Node, "Auto",
    $(go.Shape,
      { fill: $(go.Brush, "Linear", { 0: "white", 1: "lightblue" }),
        stroke: "darkblue", strokeWidth: 2 }),
    $(go.Panel, "Table",
      { defaultAlignment: go.Spot.Left, margin: 4 },
      $(go.RowColumnDefinition, { column: 1, width: 4 }),
      $(go.TextBlock,
        { row: 0, column: 0, columnSpan: 3, alignment: go.Spot.Center },
        { font: "bold 12pt sans-serif" },
        new go.Binding("text", "key")),
      $(go.TextBlock, "First: ",
        { row: 1, column: 0 }),
      $(go.TextBlock,
        { row: 1, column: 2 },
        new go.Binding("text", "prop1")),
      $(go.TextBlock, "Second: ",
        { row: 2, column: 0 }),
      $(go.TextBlock,
        { row: 2, column: 2 },
        new go.Binding("text", "prop2"))
    )
  );
231
diagram.model.nodeDataArray = [
  { key: "Alpha", prop1: "value of 'prop1'", prop2: "the other property" }
];
235</code></pre>
236<script>goCode("borderedtable", 300, 150)</script>
237
238<h3 id="FixedSizeNodes">Fixed-size nodes</h3>
<p>
  The above examples have the "Auto" Panel surround some content, where the content might be of different sizes.
  That results in the Nodes having different sizes.
</p>
<p>
  If you want a <a>Panel</a> (and thus a Node, because <a>Node</a> inherits from <a>Part</a> which inherits from <a>Panel</a>)
  to be of fixed size, set <a>GraphObject.desiredSize</a> on that panel.
  (Equivalently, you can set <a>GraphObject.width</a> and <a>GraphObject.height</a>.)
  That may result in the clipping of content that is too large,
  or it may result in extra space if the content is smaller than the available area provided by the "Auto" Panel.
</p>
250<pre class="lang-js" id="fixedsize"><code>
diagram.nodeTemplate =
  $(go.Node, "Auto",
    { desiredSize: new go.Size(100, 50) },  // on Panel
    $(go.Shape,
      new go.Binding("figure", "fig"),
      new go.Binding("fill", "color")),
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key"))
  );
diagram.model.nodeDataArray = [
  { key: "Alpha", color: "lightblue", fig: "RoundedRectangle" },
  { key: "Beta", color: "lightblue", fig: "Ellipse" },
  { key: "Gamma", color: "lightblue", fig: "Hexagon" },
  { key: "Delta", color: "lightblue", fig: "FramedRectangle" },
  { key: "Epsilon,Epsilon,Epsilon", color: "lightblue", fig: "Cloud" },
  { key: "Z", color: "lightblue", fig: "Procedure" }
];
269</code></pre>
270<script>goCode("fixedsize", 500, 200)</script>
<p>
  Note how the "Epsilon..." TextBlock is measured with the constraint of having a limited width,
  as imposed by the Panel's width.  That results in the text being wrapped before (maybe) being clipped.
</p>
<p>
  You probably do not want to set the desiredSize of the main element, the Shape in this case above.
  If you did, that would not constrain how the content elements are sized within the Panel.
</p>
279<pre class="lang-js" id="fixedsize2"><code>
diagram.nodeTemplate =
  $(go.Node, "Auto",
    $(go.Shape,
      { desiredSize: new go.Size(100, 50) },  // on main element, not on Panel
      new go.Binding("figure", "fig"),
      new go.Binding("fill", "color")),
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key"))
  );
diagram.model.nodeDataArray = [
  { key: "Alpha", color: "lightblue", fig: "RoundedRectangle" },
  { key: "Beta", color: "lightblue", fig: "Ellipse" },
  { key: "Gamma", color: "lightblue", fig: "Hexagon" },
  { key: "Delta", color: "lightblue", fig: "FramedRectangle" },
  { key: "Epsilon,Epsilon,Epsilon", color: "lightblue", fig: "Cloud" },
  { key: "Z", color: "lightblue", fig: "Procedure" }
];
298</code></pre>
299<script>goCode("fixedsize2", 500, 200)</script>
<p>
  Note how the TextBlock is measured without the constraint of having a limited width from the Panel.
  That results in the text being treated as a single long line, which is then clipped by the Panel.
</p>
304
305<h2 id="StackedContent">Stacked Content</h2>
306<p>
307Many simple nodes consist of a few objects positioned above each other or next to each other.
308</p>
309
310<h3 id="Icons">Icons</h3>
311<p>
312Perhaps the most commonly seen kind of node can be implemented using a Vertical <a>Panel</a>.
313</p>
314<pre class="lang-js" id="icons"><code>
diagram.nodeTemplate =
  $(go.Node, "Vertical",
    $(go.Picture,
      { maxSize: new go.Size(50, 50) },
      new go.Binding("source", "img")),
    $(go.TextBlock,
      { margin: new go.Margin(3, 0, 0, 0),
        maxSize: new go.Size(100, 30),
        isMultiline: false },
      new go.Binding("text", "text"))
  );
326
diagram.model.nodeDataArray = [
  { text: "Jellylorum", img: "images/50x40.png" }
];
330</code></pre>
331<script>goCode("icons", 300, 150)</script>
332<p>
Of course you are not limited to just two objects in a panel.
In fact you can have as many GraphObjects in a "Vertical" or a "Horizontal" Panel as you like.
335</p>
336<pre class="lang-js" id="icons2"><code>
diagram.nodeTemplate =
  $(go.Node, "Vertical",
    $(go.TextBlock,
      { margin: new go.Margin(3, 0, 0, 0),
        maxSize: new go.Size(100, 30),
        isMultiline: false,
        font: "bold 10pt sans-serif" },
      new go.Binding("text", "head")),
    $(go.Picture,
      { maxSize: new go.Size(50, 50) },
      new go.Binding("source", "img")),
    $(go.TextBlock,
      { margin: new go.Margin(3, 0, 0, 0),
        maxSize: new go.Size(100, 30),
        isMultiline: false },
      new go.Binding("text", "foot"))
  );
diagram.model.nodeDataArray = [
  { head: "Kitten", foot: "Tantomile", img: "images/50x40.png" }
];
357</code></pre>
358<script>goCode("icons2", 300, 150)</script>
359
360<h3 id="SmallIcons">Small icons</h3>
361<p>
362Another commonly seen kind of node can be implemented using a Horizontal <a>Panel</a>.
363</p>
364<pre class="lang-js" id="smallicons"><code>
diagram.nodeTemplate =
  $(go.Node, "Horizontal",
    $(go.Picture,
      { maxSize: new go.Size(16, 16) },
      new go.Binding("source", "img")),
    $(go.TextBlock,
      { margin: new go.Margin(0, 0, 0, 2) },
      new go.Binding("text", "text"))
  );
374
diagram.model.nodeDataArray = [
  { text: "Alonzo", img: "images/50x40.png" }
];
378</code></pre>
379<script>goCode("smallicons", 300, 150)</script>
380
381<h2 id="NestedPanels">Nested Panels</h2>
382<p>
383Panels can be nested.
384For example, here is a node consisting of an "Vertical" Panel consisting of an "Auto" Panel surrounding a "Vertical" Panel including a "Horizontal" Panel.
385The outer "Vertical" Panel arranges the main stuff on top and a TextBlock on the bottom.
386The "Auto" Panel supplies a border around everything but the bottom text.
387The inner "Vertical" Panel places three objects vertically in a stack.
388The "Horizontal" Panel which is the first element of the "Vertical" Panel places three objects horizontally in a row.
389</p>
390<pre class="lang-js" id="nestedpanel1"><code>
// common styling for each indicator
function makeIndicator(propName) {  // the data property name
  return $(go.Shape,
      "Circle",
      { width: 8, height: 8, fill: "white", strokeWidth: 0, margin: 5 },
      new go.Binding("fill", propName));
}
398
function makeImagePath(icon) { return "../samples/images/" + icon; }
400
diagram.nodeTemplate =
  $(go.Node, "Vertical",
    $(go.Panel, "Auto",
      { background: "white" },
      { portId: "" },  // this whole panel acts as the only port for the node
      $(go.Shape,  // the border
        { fill: "transparent", stroke: "lightgray" }),
      $(go.Panel, "Vertical",  // everything within the border
        $(go.Panel, "Horizontal",  // the row of status indicators
          makeIndicator("ind0"),
          makeIndicator("ind1"),
          makeIndicator("ind2")
        ),  // end Horizontal Panel
        $(go.Picture,
          { width: 32, height: 32, margin: 4 },
          new go.Binding("source", "icon", makeImagePath)),
        $(go.TextBlock,
          { stretch: go.GraphObject.Horizontal, textAlign: "center" },
          new go.Binding("text", "number"),
          new go.Binding("background", "color"))
      )  // end Vertical Panel
    ),  // end Auto Panel
    $(go.TextBlock,
      { margin: 4 },
      new go.Binding("text"))
  );
427
diagram.model.nodeDataArray = [
  { key: 1, text: "Device Type A", number: 17, icon: "server switch.jpg", color: "moccasin",
    ind0: "red", ind1: "orange", ind2: "mediumspringgreen" },
  { key: 2, text: "Device Type B", number: 97, icon: "voice atm switch.jpg", color: "mistyrose",
    ind0: "lightgray", ind1: "orange", ind2: "green" }
];
diagram.model.linkDataArray = [
  { from: 1, to: 2 }
];
437</code></pre>
438<script>goCode("nestedpanel1", 300, 150)</script>
439
440<h2 id="DecoratedContent">Decorated Content</h2>
441<p>
442Sometimes you want to have a simple node that may display additional visuals
443to indicate what state it is in.
444</p>
445
446<p>
447One way to implement this is to use a Spot <a>Panel</a>, where the main element is itself a Panel
448containing the elements that you always want to display, and there are additional objects located at spots around the main element.
449The basic outline would be:
450</p>
451<pre  class="lang-js"><code>
452Node, "Spot"
  Panel, "Auto"  // the contents with border
      Shape        // the border
      Panel, ...   // the contents
         . . .
  Shape  // the decoration
458</code></pre>
459<p>
460So the basic body of the node is in a "Vertical" or any kind of Panel,
461which is surrounded by a border using an "Auto" Panel,
462which gets decorations using the "Spot" Panel that is also the Node.
463</p>
464<p>
465The same design of having the Node be a "Spot" Panel can also used for placing ports relative to the body of a node.
466</p>
467<pre class="lang-js" id="spotdecorations"><code>
diagram.nodeTemplate =
  $(go.Node, "Spot",
    // the main content:
    $(go.Panel, "Vertical",
      $(go.Picture,
        { maxSize: new go.Size(50, 50) },
        new go.Binding("source", "img")),
      $(go.TextBlock,
        { margin: new go.Margin(3, 0, 0, 0) },
        new go.Binding("text", "text"),
        new go.Binding("stroke", "error", function(err) { return err ? "red" : "black" }))
    ),
    // decorations:
    $(go.Shape, "TriangleUp",
      { alignment: go.Spot.TopLeft,
        fill: "yellow", width: 14, height: 14,
        visible: false },
      new go.Binding("visible", "info", function(i) { return i ? true : false; })),
    $(go.Shape, "StopSign",
      { alignment: go.Spot.TopRight,
        fill: "red", width: 14, height: 14,
        visible: false },
      new go.Binding("visible", "error")),
    {
      toolTip:
        $(go.Adornment, "Auto",
          $(go.Shape, { fill: "#FFFFCC" },
            new go.Binding("visible", "info", function(i) { return i ? true : false; })),
          $(go.TextBlock, { margin: 4 },
            new go.Binding("text", "info"))
        )
    }
  );
501
diagram.model.nodeDataArray = [
  { text: "Demeter", img: "images/50x40.png", info: "" },
  { text: "Copricat", img: "images/50x40.png", error: true, info: "shredded curtains" }
];
506</code></pre>
507<script>goCode("spotdecorations", 300, 150)</script>
508
509<p>
510As another example of a node decoration, this implements a "ribbon" at the top right corner of the node.
511The ribbon is implemented by a <a>Panel</a> that contains both a <a>Shape</a> and a <a>TextBlock</a>,
512and the panel is positioned by its <a>GraphObject.alignment</a> and <a>GraphObject.alignmentFocus</a> in
513the Spot Panel that also is the <a>Node</a>.
514The appearance of the ribbon is achieved by using a custom <a>Geometry</a> and binding <a>GraphObject.opacity</a>.
515</p>
516<pre class="lang-js" id="ribbondecorations"><code>
diagram.nodeTemplate =
  $(go.Node, "Spot",
    { locationSpot: go.Spot.Center, locationObjectName: "BODY" },
    { selectionObjectName: "BODY" },
    $(go.Panel, "Auto",
      { name: "BODY", width: 150, height: 100 },
      { portId: "" },
      $(go.Shape,
        { fill: "lightgray", stroke: null, strokeWidth: 0 }),
      $(go.TextBlock,
        new go.Binding("text"))
    ),
    $(go.Panel, "Spot",
      new go.Binding("opacity", "ribbon", function(t) { return t ? 1 : 0; }),
      // note that the opacity defaults to zero (not visible),
      // in case there is no "ribbon" property
      { opacity: 0,
        alignment: new go.Spot(1, 0, 5, -5),
        alignmentFocus: go.Spot.TopRight },
      $(go.Shape,  // the ribbon itself
        { geometryString: "F1 M0 0 L30 0 70 40 70 70z",
          fill: "red", stroke: null, strokeWidth: 0 }),
      $(go.TextBlock,
        new go.Binding("text", "ribbon"),
        { alignment: new go.Spot(1, 0, -29, 29),
          angle: 45, maxSize: new go.Size(100, NaN),
          stroke: "white", font: "bold 13px sans-serif", textAlign: "center" })
    )
  );
546
diagram.model = new go.GraphLinksModel([
  { key: 1, text: "Alpha" },
  { key: 2, text: "Beta", ribbon: "NEWEST" }
],[
]);
552</code></pre>
553<script>goCode("ribbondecorations", 500, 150)</script>
554
555<h2 id="PositionAndLocation">Position and Location</h2>
556<p>
557Nodes are positioned in document coordinates.
558(For more information, read <a href="viewport.html">Coordinate Systems</a>.)
559The point at which a Node resides, in document coordinates, is normally the top-left corner of the Node's <a>GraphObject.actualBounds</a>.
560If you set the <a>GraphObject.position</a> of a Node, you will be modifying the <code>x</code> and <code>y</code> values of the node's <a>GraphObject.actualBounds</a>.
561</p>
562<p>
563However there are times when it is more natural to think that the "point" of a Node is not at the top-left corner but at some other spot within.
564This is especially true when you want any variably-sized text labels or occasional decorations to be ignored regarding the node's location.
565That is why Nodes also have a "location" which refers to a point inside the Node.
566If you set the <a>Part.location</a> of a Node, you will be lining up the location point of the node to be at that point in document coordinates.
567When you move a Node you are actually changing its <a>Part.location</a>.
568</p>
569<p>
570By default the location of a Node is the same as its position.
571However you can set the <a>Part.locationSpot</a> to cause the location point to be at some spot in the node's actualBounds.
572Furthermore you can set the <a>Part.locationObjectName</a> to cause the location point to be at some spot in some element within the node.
573The position will always be at the top-left corner of the whole node,
574but the location may be some point at some spot in some object within the node.
575</p>
576<pre class="lang-js" id="positionlocation"><code>
diagram.grid.visible = true;
578
diagram.add(
  $(go.Node, "Vertical",
    { position: new go.Point(0, 0) },  // set the Node.position
    $(go.TextBlock, "position", { editable: true }),
    $(go.Shape, { name: "SHAPE", width: 30, height: 30, fill: "lightgreen" })
  ));
585
diagram.add(
  $(go.Node, "Vertical",
    {
      location: new go.Point(100, 0),  // set the Node.location
      locationObjectName: "SHAPE"  // the location point is on the element named "SHAPE"
    },
    $(go.TextBlock, "location", { editable: true }),
    $(go.Shape, { name: "SHAPE", width: 30, height: 30, fill: "lightgreen" })
  ));
595</code></pre>
596<script>goCode("positionlocation", 500, 200)</script>
597<p>
598In this example both nodes have the same Y-coordinate value of zero.
599Note how in the above example the "position" Node has the top-left corner of the node at the grid point.
600Yet the "location" Node has the top-left corner of the green square at the grid point.
601If you edit the text of each node after double-clicking on the text,
602note how the green square moves relative to the diagram grid for the "position" node,
603but that it does not move for the "location" node.
604</p>
605<p>
606It is common to specify the <a>Part.locationSpot</a> to be <code>go.Spot.Center</code> so that the location point
607is at the center of some element in the node, rather than at the top-left corner of that element.
608</p>
609<pre class="lang-js" id="positionlocation2"><code>
610diagram.grid.visible = true;
611
612diagram.add(
$(go.Node, "Vertical",
  { position: new go.Point(0, 0) },  // set the Node.position
  $(go.TextBlock, "position", { editable: true }),
  $(go.Panel, "Auto",
    $(go.Shape, "Circle", { name: "SHAPE", width: 16, height: 16, fill: "lightgreen" }),
    $(go.Shape, "Circle", { width: 6, height: 6, strokeWidth: 0 })
  )
));
621
622diagram.add(
$(go.Node, "Vertical",
  {
    location: new go.Point(100, 0),  // set the Node.location
    locationObjectName: "SHAPE",  // the location point is at the center of "SHAPE"
    locationSpot: go.Spot.Center
  },
  $(go.TextBlock, "location", { editable: true }),
  $(go.Panel, "Auto",
    $(go.Shape, "Circle", { name: "SHAPE", width: 16, height: 16, fill: "lightgreen" }),
    $(go.Shape, "Circle", { width: 6, height: 6, strokeWidth: 0 })
  )
));
635</code></pre>
636<script>goCode("positionlocation2", 500, 200)</script>
637<p>
638If the position or location of a Node is not <a>Point.isReal</a>, it will not be seen, because GoJS will not know where to draw the node.
639In fact the default value for a node's position or location is <code>NaN, NaN</code> and it is the responsibility of either the <a>Diagram.layout</a>
640or data bindings to assign real point values for each node.
641</p>
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