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<h1>Link Connection Points on Nodes</h1>
<p>
There is flexibility in controlling exactly how and where a link connects to a node.
In the previous examples the link has always ended at the edge of the node.
But you can specify the <a>Spot</a> on a node at which a link terminates.
</p>
<h2 id="NonRectangularNodes">Non-rectangular Nodes</h2>
<p>
When a <a>Node</a> does not have a rectangular shape, by default links will end
where the line toward the center of the node intersects with the edge of the node.
</p>
<p>
Here is a demonstration of that -- drag one of the nodes around and watch how the link always
connects to the nearest intersection or to the center of the node.
This example includes arrowheads at both ends of the link, to make it clear that the link route
really ends right at the edge of the node.
</p>
<pre class="lang-js" id="nonRectangular"><code>
diagram.nodeTemplate =
$(go.Node, "Auto",
{ width: 90, height: 90,
selectionAdorned: false },
new go.Binding("location", "loc", go.Point.parse),
$(go.Shape, "FivePointedStar", { fill: "lightgray" }),
$(go.TextBlock,
new go.Binding("text", "key"))
);
diagram.linkTemplate =
$(go.Link,
$(go.Shape),
$(go.Shape, // the "from" end arrowhead
{ fromArrow: "Chevron" }),
$(go.Shape, // the "to" end arrowhead
{ toArrow: "StretchedDiamond", fill: "red" })
);
var nodeDataArray = [
{ key: "Alpha", loc: "0 0" },
{ key: "Beta", loc: "100 50" }
];
var linkDataArray = [
{ from: "Alpha", to: "Beta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
</code></pre>
<script>goCode("nonRectangular", 600, 150)</script>
<h2 id="ToSpotAndFromSpot">ToSpot and FromSpot</h2>
<p>
You can easily require links to end at a particular point within the bounds of the node,
rather than at the nearest edge intersection.
Set the <a>GraphObject.toSpot</a> to a <a>Spot</a> value other than <a>Spot,None</a>
to cause links coming into the node to end at that spot within the node, with a direction
that is appropriate for the side that the spot is at.
Similarly, set the <a>GraphObject.fromSpot</a> for the ends of links coming out of the node.
</p>
<p>
The following examples all display the same graph but use different templates
to demonstrate how links can connect to nodes.
They all call this common function to define some nodes and links.
</p>
<pre class="lang-js" id="makeGraph"><code>
function makeGraph(diagram) {
var $ = go.GraphObject.make;
diagram.layout =
$(go.LayeredDigraphLayout, // this will be discussed in a later section
{
columnSpacing: 5,
setsPortSpots: false,
alignOption: go.LayeredDigraphLayout.AlignAll
});
var nodeDataArray = [
{ key: "Alpha" }, { key: "Beta" }, { key: "Gamma" }, { key: "Delta" },
{ key: "Epsilon" }, { key: "Zeta" }, { key: "Eta" }, { key: "Theta" }
];
var linkDataArray = [
{ from: "Beta", to: "Alpha" },
{ from: "Gamma", to: "Alpha" },
{ from: "Delta", to: "Alpha" },
{ from: "Alpha", to: "Epsilon" },
{ from: "Alpha", to: "Zeta" },
{ from: "Alpha", to: "Eta" },
{ from: "Alpha", to: "Theta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
}
</code></pre>
<script>eval(document.getElementById("makeGraph").textContent)</script>
<p>
Let us specify that links coming into a node connect at the middle of the left side, and that links going out
of a node connect at the middle of the right side. Such a convention is appropriate for diagrams that have
a general sense of direction to them, such as the following one which goes from left to right.
</p>
<pre class="lang-js" id="leftright"><code>
diagram.nodeTemplate =
$(go.Node, "Auto",
{ fromSpot: go.Spot.Right, // coming out from middle-right
toSpot: go.Spot.Left }, // going into middle-left
$(go.Shape, "Rectangle", { fill: "lightgray" }),
$(go.TextBlock,
{ margin: 5},
new go.Binding("text", "key"))
);
diagram.linkTemplate =
$(go.Link,
$(go.Shape),
$(go.Shape, { toArrow: "Standard" })
);
makeGraph(diagram);
</code></pre>
<script>goCode("leftright", 600, 150)</script>
<p>
You can also specify that the links go into a node not at a single spot but spread out along one side.
Instead of <a>Spot,Right</a> use <a>Spot,RightSide</a>, and similarly for the left side.
</p>
<pre class="lang-js" id="leftrightSides"><code>
diagram.nodeTemplate =
$(go.Node, "Auto",
{ fromSpot: go.Spot.RightSide, // coming out from right side
toSpot: go.Spot.LeftSide }, // going into left side
$(go.Shape, "Rectangle", { fill: "lightgray" }),
$(go.TextBlock,
{ margin: 5},
new go.Binding("text", "key"))
);
diagram.linkTemplate =
$(go.Link,
$(go.Shape),
$(go.Shape, { toArrow: "Standard" })
);
makeGraph(diagram);
</code></pre>
<script>goCode("leftrightSides", 600, 150)</script>
<p>
Of course this only looks good when the nodes are basically rectangular.
</p>
<p>
You can use a different kind of <a>Link.routing</a>:
</p>
<pre class="lang-js" id="leftrightSidesOrthogonal"><code>
diagram.nodeTemplate =
$(go.Node, "Auto",
{ fromSpot: go.Spot.RightSide, // coming out from right side
toSpot: go.Spot.LeftSide }, // going into left side
$(go.Shape, "Rectangle", { fill: "lightgray" }),
$(go.TextBlock,
{ margin: 5},
new go.Binding("text", "key"))
);
diagram.linkTemplate =
$(go.Link,
{ routing: go.Link.Orthogonal, // Orthogonal routing
corner: 10 }, // with rounded corners
$(go.Shape),
$(go.Shape, { toArrow: "Standard" })
);
makeGraph(diagram);
</code></pre>
<script>goCode("leftrightSidesOrthogonal", 600, 150)</script>
<p>
Or you can use a different kind of <a>Link.curve</a>:
</p>
<pre class="lang-js" id="leftrightSidesBezier"><code>
diagram.nodeTemplate =
$(go.Node, "Auto",
{ fromSpot: go.Spot.RightSide, // coming out from right side
toSpot: go.Spot.LeftSide }, // going into left side
$(go.Shape, "Rectangle", { fill: "lightgray" }),
$(go.TextBlock,
{ margin: 5},
new go.Binding("text", "key"))
);
diagram.linkTemplate =
$(go.Link,
{ curve: go.Link.Bezier }, // Bezier curve
$(go.Shape),
$(go.Shape, { toArrow: "Standard" })
);
makeGraph(diagram);
</code></pre>
<script> goCode("leftrightSidesBezier", 600, 150)</script>
<p>
But you need to be careful to specify sensible spots for how the graph is arranged.
</p>
<pre class="lang-js" id="leftrightSidesBad"><code>
diagram.nodeTemplate =
$(go.Node, "Auto",
{ fromSpot: go.Spot.TopSide, // coming out from top side -- BAD!
toSpot: go.Spot.RightSide }, // going into right side -- BAD!
$(go.Shape, "Rectangle", { fill: "lightgray" }),
$(go.TextBlock,
{ margin: 5},
new go.Binding("text", "key"))
);
diagram.linkTemplate =
$(go.Link,
$(go.Shape),
$(go.Shape, { toArrow: "Standard" })
);
makeGraph(diagram);
diagram.add($(go.Part, // this is just a comment
{ location: new go.Point(300, 50) },
$(go.TextBlock, "Bad Spots",
{ font: "16pt bold", stroke: "red" })
));
</code></pre>
<script>goCode("leftrightSidesBad", 600, 150)</script>
<h3 id="UndirectedSpots">Undirected Spots</h3>
<p>
When no spot is specified for the <a>GraphObject.fromSpot</a> or <a>GraphObject.toSpot</a>,
the route computation will compute the furthest point on the route of the link from the center of the port to the other port
that is an intersection of an edge of the port.
This was demonstrated above in <a href="#NonRectangularNodes">Non-rectangular Nodes</a> and is again demonstrated here.
</p>
<pre class="lang-js" id="noSpotFocus0"><code>
diagram.nodeTemplate =
$(go.Node, "Vertical",
new go.Binding("location", "loc", go.Point.parse),
$(go.Shape, "YinYang",
{
fill: "white", portId: ""
},
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 8 },
new go.Binding("text"))
);
diagram.model = new go.GraphLinksModel(
[
{ key: 1, text: "Alpha", color: "lightblue", loc: "0 50" },
{ key: 2, text: "Beta", color: "orange", loc: "150 0" },
{ key: 3, text: "Gamma", color: "lightgreen", loc: "300 50" }
],
[
{ from: 1, to: 2 },
{ from: 2, to: 3 }
]);
</code></pre>
<script>goCode("noSpotFocus0", 600, 250)</script>
<p>
However it is possible to specify a focus point that is different from the center of the port.
Use a <a>Spot</a> value that has <a>Spot.x</a> and <a>Spot.y</a> equal to 0.5 but with <a>Spot.offsetX</a> and <a>Spot.offsetY</a>
values that specify where you want links to focus towards, relative to the center of the port.
</p>
<pre class="lang-js" id="noSpotFocus1"><code>
diagram.nodeTemplate =
$(go.Node, "Vertical",
new go.Binding("location", "loc", go.Point.parse),
$(go.Shape, "YinYang",
{
fill: "white", portId: "",
fromSpot: new go.Spot(0.5, 0.5, 0, -25), toSpot: new go.Spot(0.5, 0.5, 0, 25)
},
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 8 },
new go.Binding("text"))
);
diagram.model = new go.GraphLinksModel(
[
{ key: 1, text: "Alpha", color: "lightblue", loc: "0 50" },
{ key: 2, text: "Beta", color: "orange", loc: "150 0" },
{ key: 3, text: "Gamma", color: "lightgreen", loc: "300 50" }
],
[
{ from: 1, to: 2 },
{ from: 2, to: 3 }
]);
</code></pre>
<script>goCode("noSpotFocus1", 600, 250)</script>
<p>
In this example, links always appear to be coming from the hole near the top of the "YinYang" figure
towards the dot near the bottom of the figure.
Try moving the nodes to see this behavior.
Note that the <a>Spot.x</a> and <a>Spot.y</a> values are both 0.5, with fixed offsets from the center of the port.
</p>
<p>
It is also possible to have links go directly to particular spots within a port.
Use regular <a>Spot</a> values, but set the Link's end segment length to zero,
<a>Link.fromEndSegmentLength</a> or <a>Link.toEndSegmentLength</a>.
</p>
<pre class="lang-js" id="noSpotFocus2"><code>
diagram.nodeTemplate =
$(go.Node, "Vertical",
new go.Binding("location", "loc", go.Point.parse),
$(go.Shape, "YinYang",
{
fill: "white", portId: "",
fromSpot: new go.Spot(0.5, 0.25), toSpot: new go.Spot(0.5, 0.75),
fromEndSegmentLength: 0, toEndSegmentLength: 0
},
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 8 },
new go.Binding("text"))
);
diagram.model = new go.GraphLinksModel(
[
{ key: 1, text: "Alpha", color: "lightblue", loc: "0 50" },
{ key: 2, text: "Beta", color: "orange", loc: "150 0" },
{ key: 3, text: "Gamma", color: "lightgreen", loc: "300 50" }
],
[
{ from: 1, to: 2 },
{ from: 2, to: 3 }
]);
</code></pre>
<script>goCode("noSpotFocus2", 600, 250)</script>
<p>
Again, links always appear to be coming from the hole near the top of the "YinYang" figure
towards the dot near the bottom of the figure, but now they go all the way rather than stop at the edge.
Note that the <a>Spot.x</a> and <a>Spot.y</a> values are <i>not</i> both 0.5,
and that the Link end segment lengths are zero.
</p>
<h2 id="SpotsForIndividualLinks">Spots for Individual Links</h2>
<p>
Setting the <a>GraphObject.fromSpot</a> and <a>GraphObject.toSpot</a> properties specifies
the default link connection point for all links connected to the node.
What if you want some links to go to the middle-top spot but some other links to go to the middle-left spot of the same node?
You can achieve this by setting the <a>Link.fromSpot</a> and <a>Link.toSpot</a> properties,
which take precedence over the correspondingly named properties of what the link connects with.
</p>
<pre class="lang-js" id="customSpots"><code>
diagram.nodeTemplate =
$(go.Node, "Auto",
$(go.Shape, "Rectangle", { fill: "lightgray" }),
$(go.TextBlock,
{ margin: 5},
new go.Binding("text", "key"))
);
diagram.linkTemplate =
$(go.Link,
// get the link spots from the link data
new go.Binding("fromSpot", "fromSpot", go.Spot.parse),
new go.Binding("toSpot", "toSpot", go.Spot.parse),
$(go.Shape),
$(go.Shape, { toArrow: "Standard" })
);
var nodeDataArray = [
{ key: "Alpha" }, { key: "Beta" }, { key: "Gamma" }, { key: "Delta" }
];
var linkDataArray = [
{ from: "Alpha", to: "Beta", fromSpot: "TopRight", toSpot: "Left" },
{ from: "Alpha", to: "Gamma", fromSpot: "Left", toSpot: "Left" },
{ from: "Alpha", to: "Delta", fromSpot: "None", toSpot: "Top" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
</code></pre>
<script>goCode("customSpots", 600, 150)</script>
<h3 id="SomeLayoutsSetLinkSpots">Some Layouts set Link Spots</h3>
<p>
Some of the predefined <a>Layout</a>s automatically set <a>Link.fromSpot</a> and <a>Link.toSpot</a>
when the nature of the layout implies a natural direction.
So, for example, a <a>TreeLayout</a> with a <a>TreeLayout.angle</a> <code>== 90</code> will set each Link's
fromSpot to be <a>Spot,Bottom</a> and each Link's toSpot to be <a>Spot,Top</a>.
</p>
<p>
You can disable the setting of Link spots for TreeLayout by setting <a>TreeLayout.setsPortSpot</a> and/or <a>TreeLayout.setsChildPortSpot</a> to false.
For LayeredDigraphLayout, set <a>LayeredDigraphLayout.setsPortSpots</a> to false.
For ForceDirectedLayout, set <a>ForceDirectedLayout.setsPortSpots</a> to false, although this is rarely needed.
</p>
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