@fboes/horizontal-situation-indicator

Horizontal Situation Indicator

A Vanilla JavaScript web component which displays a self-contained Horizontal Situation Indicator, an airplane cockpit instrument used for instrument navigation.

For a demo see https://3960.org/webcomponent-hsi/.

Installation

Either download the horizontal-situation-indicator.js to a sensible location in your web project, or do a NPM installation:

npm install @fboes/horizontal-situation-indicator --save

Instead of a local installation you may also load the library from https://unpkg.com/. Beware: This makes https://unpkg.com/ a dependency of your project and may pose data protection issues.

<script type="module" src="https://unpkg.com/@fboes/horizontal-situation-indicator@latest/horizontal-situation-indicator.js"></script>

Everything required for the frontend functionality of this web component is contained in horizontal-situation-indicator.js.

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Usage

Loading the library prior to use:

<!-- load element library -->
<script type="module" src="horizontal-situation-indicator.js"></script>

Invoke a new instance by placing this into your HTML source code:

<!-- use element -->
<horizontal-situation-indicator heading="45.0" heading-select="0.0"></horizontal-situation-indicator>

Simple compass

<horizontal-situation-indicator heading="45.0" heading-select="0.0"></horizontal-situation-indicator>

HSI with NAV1 tuned to ADF

<horizontal-situation-indicator heading="45.0" heading-select="0.0"
  nav1-bearing="10.0"></horizontal-situation-indicator>

HSI with NAV2 tuned to VOR

<horizontal-situation-indicator heading="45.0" heading-select="0.0"
  nav2-course="0.0" nav2-deviation="0.0" nav2-to="-1"></horizontal-situation-indicator>

Properties

Properties can be set on initialization via HTML attributes, or selecting the DOM node via JavaScript and setting the properties of the DOM node.

If a property is not set or unset, the corresponding HSI component will be hidden.

Name	Type	Default	Description
heading	?degree	null
heading-select	?degree	null
nav1-label	?string	null
nav1-course	?degree	null
nav1-deviation	?deviation	null	Only visible when nav1-course is set.
nav1-bearing	?degree	null	This will also set nav1-to and nav1-deviation accordingly.
nav1-to	?switch	null	If set to 1 will show the TO-flag, if set to -1 will show the FROM-flag.
nav2-label	?string	null
nav2-course	?degree	null
nav2-deviation	?deviation	null	Only visible when nav2-course is set.
nav2-bearing	?degree	null	This will also set nav2-to and nav2-deviation accordingly.
nav2-to	?switch	null	If set to 1 will show the TO-flag, if set to -1 will show the FROM-flag.
fix-north	?switch	null	If set to 1 the compass card will be locked to north, while the plane and lubber line rotate.

Types prefixed with ? allow setting value to null as well.

Special types:

Type	Description
degree	A float number with 0 ≤ degree < 360. degree out of this range will be converted to a corresponding value in this range, e.g. -1.0 will be 359.0.
deviation	A float number with -180 ≤ deviation < 180. deviation out of this range will be converted to a corresponding value in this range. deviation > 0 showing the the chosen course to be right / above, deviation < 0 showing the the chosen course to be left / below. A value of ±5.0 (±175) will move the marker to the first dot, a value of ±10.0 (±170) will move the marker to the second dot.

Methods

There are no public methods.

Events

There are no events.

Styling

To change the layout of the HSI component use CSS variables. There is a set of defined CSS variables which you may use:

horizontal-situation-indicator {
  --background-outer-color: black;
  --background-color: black;
  --foreground-color: white;
  --lubber-color: darkorange;
  --heading-select-color: cyan;
  --nav1-color: magenta;
  --nav1-bearing-color: var(--nav1-color);
  --nav2-color: cyan;
  --nav2-bearing-color: var(--nav2-color);
  --stroke-width: 0.5;
}

Browser compatibility

See compatibility chart:

• Google Chrome 67+
• Mozilla Firefox 63+
• Microsoft Edge 79+
• Opera 64+

If you need extended compatibility, search for Web Components Polyfills.

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Development

• Run npm run build to copy files from src directory into main JavaScript file.
• Run npm run serve to launch a development web server.
• The property debug="1" will activate additional output to console.

Status

Legal stuff

Author: Frank Boës

Copyright & license: See LICENSE.txt