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DimensioningLink.js
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/*
* Copyright 1998-2025 by Northwoods Software Corporation. All Rights Reserved.
*/
/*
* This is an extension and not part of the main GoJS library.
* The source code for this is at extensionsJSM/DimensioningLink.ts.
* Note that the API for this class may change with any version, even point releases.
* If you intend to use an extension in production, you should copy the code to your own source directory.
* Extensions can be found in the GoJS kit under the extensions or extensionsJSM folders.
* See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
*/
/**
* A custom routed {@link go.Link} for showing the distances between a point on one node and a point on another node.
*
* Note that because this is a Link, the points being measured must be on {@link go.Node}s, not simple {@link go.Part}s.
* The exact point on each Node is determined by the {@link go.Link.fromSpot} and {@link go.Link.toSpot}.
*
* Several properties of the DimensioningLink customize the appearance of the dimensioning:
* {@link direction}, for orientation of the dimension line and which side it is on,
* {@link extension}, for how far the dimension line is from the measured points,
* {@link inset}, for leaving room for a text label, and
* {@link gap}, for distance that the extension line starts from the measured points.
*
* If you want to experiment with this extension, try the <a href="../../samples/Dimensioning.html">Dimensioning</a> sample.
* @category Part Extension
*/
class DimensioningLink extends go.Link {
/**
* Constructs a DimensioningLink and sets the following properties:
* - {@link Part.isLayoutPositioned} = false
* - {@link Link.isTreeLink} = false
* - {@link Link.routing} = {@link go.Routing.Orthogonal}
*/
constructor(init) {
super();
this.isLayoutPositioned = false;
this.isTreeLink = false;
this.routing = go.Routing.Orthogonal;
this._direction = 0;
this._extension = 30;
this._inset = 10;
this._gap = 10;
if (init)
Object.assign(this, init);
}
/**
* Copies properties to a cloned DimensioningLink.
*/
cloneProtected(copy) {
super.cloneProtected(copy);
copy._direction = this._direction;
copy._extension = this._extension;
copy._inset = this._inset;
copy._gap = this._gap;
}
/**
* The general angle at which the measurement should be made.
*
* The default value is 0, meaning to go measure only along the X axis,
* with the dimension line and label above the two nodes (at lower Y coordinates).
* New values must be one of: 0, 90, 180, 270, or NaN.
* The value NaN indicates that the measurement is point-to-point and not orthogonal.
*/
get direction() {
return this._direction;
}
set direction(val) {
const old = this._direction;
if (isNaN(val) || val === 0 || val === 90 || val === 180 || val === 270) {
this._direction = val;
this.raiseChangedEvent(go.ChangeType.Property, 'direction', this, old, val);
this.invalidateRoute();
}
else {
throw new Error('DimensioningLink: invalid new direction: ' + val);
}
}
/**
* The distance at which the dimension line should be from the points being measured.
*
* The default value is 30.
* Larger values mean further away from the nodes.
* The new value must be greater than or equal to zero.
*/
get extension() {
return this._extension;
}
set extension(val) {
const old = this._extension;
if (old !== val) {
if (typeof val !== 'number')
throw new Error('DimensioningLink.extension must be a number');
this._extension = val;
this.raiseChangedEvent(go.ChangeType.Property, 'extension', this, old, val);
this.invalidateRoute();
}
}
/**
* The distance that the dimension line should be "indented" from the ends of the
* extension lines that are orthogonal to the dimension line.
*
* The default value is 10.
*/
get inset() {
return this._inset;
}
set inset(val) {
const old = this._inset;
if (old !== val) {
if (typeof val !== 'number' || val < 0)
throw new Error('DimensioningLink.inset must be a non-negative number');
this._inset = val;
this.raiseChangedEvent(go.ChangeType.Property, 'inset', this, old, val);
this.invalidateRoute();
}
}
/**
* The distance that the extension lines should come short of the measured points.
*
* The default value is 10.
*/
get gap() {
return this._gap;
}
set gap(val) {
const old = this._gap;
if (old !== val) {
if (typeof val !== 'number' || val < 0)
throw new Error('DimensioningLink.gap must be a non-negative number');
this._gap = val;
this.raiseChangedEvent(go.ChangeType.Property, 'gap', this, old, val);
this.invalidateRoute();
}
}
/**
* Constructs the link's route by modifying {@link points}.
* @returns true if it computed a route of points
*/
computePoints() {
const fromnode = this.fromNode;
if (!fromnode)
return false;
const fromport = this.fromPort;
if (!fromport)
return false;
const fromspot = this.computeSpot(true);
const tonode = this.toNode;
if (!tonode)
return false;
const toport = this.toPort;
if (!toport)
return false;
const tospot = this.computeSpot(false);
const frompoint = this.getLinkPoint(fromnode, fromport, fromspot, true, true, tonode, toport);
if (!frompoint.isReal())
return false;
const topoint = this.getLinkPoint(tonode, toport, tospot, false, true, fromnode, fromport);
if (!topoint.isReal())
return false;
this.clearPoints();
let ang = this.direction;
if (isNaN(ang)) {
ang = frompoint.directionPoint(topoint);
const p = new go.Point(this.extension, 0);
p.rotate(ang + 90);
const q = new go.Point(this.extension - this.inset, 0);
q.rotate(ang + 90);
const g = new go.Point(this.gap, 0);
g.rotate(ang + 90);
this.addPointAt(frompoint.x + g.x, frompoint.y + g.y);
this.addPointAt(frompoint.x + p.x, frompoint.y + p.y);
this.addPointAt(frompoint.x + q.x, frompoint.y + q.y);
this.addPointAt(topoint.x + q.x, topoint.y + q.y);
this.addPointAt(topoint.x + p.x, topoint.y + p.y);
this.addPointAt(topoint.x + g.x, topoint.y + g.y);
}
else {
let r = 0.0;
let s = 0.0;
let t0 = 0.0;
let t1 = 0.0;
if (ang === 0 || ang === 180) {
if (ang === 0) {
r = Math.min(frompoint.y, topoint.y) - this.extension;
s = r + this.inset;
t0 = frompoint.y - this.gap;
t1 = topoint.y - this.gap;
}
else {
r = Math.max(frompoint.y, topoint.y) + this.extension;
s = r - this.inset;
t0 = frompoint.y + this.gap;
t1 = topoint.y + this.gap;
}
this.addPointAt(frompoint.x, t0);
this.addPointAt(frompoint.x + 0.01, r);
this.addPointAt(frompoint.x, s);
this.addPointAt(topoint.x, s);
this.addPointAt(topoint.x - 0.01, r);
this.addPointAt(topoint.x, t1);
}
else if (ang === 90 || ang === 270) {
if (ang === 90) {
r = Math.max(frompoint.x, topoint.x) + this.extension;
s = r - this.inset;
t0 = frompoint.x + this.gap;
t1 = topoint.x + this.gap;
}
else {
r = Math.min(frompoint.x, topoint.x) - this.extension;
s = r + this.inset;
t0 = frompoint.x - this.gap;
t1 = topoint.x - this.gap;
}
this.addPointAt(t0, frompoint.y);
this.addPointAt(r, frompoint.y + 0.01);
this.addPointAt(s, frompoint.y);
this.addPointAt(s, topoint.y);
this.addPointAt(r, topoint.y - 0.01);
this.addPointAt(t1, topoint.y);
}
}
this.updateTargetBindings();
return true;
}
}