**vector-js** =========

vector.js is a small module to facilitate limited 3D vector arithmetics based on unsigned 8 bit integers (UInt8). The module emulates operator overloading in JavaScript and show its limitations in the context of an included tutorial and well documented sources.

See the documentation to learn more about using and extending vector-js.

Demo

There are several demonstrations of how to use vector.js in the tutorial section of vector-js.
You can find these demos here

Authors

vector-js was written by @sauerlo

Building

No building steps are required. You can either download the repository from github, or use the npm packager:

sudo npm install -g vector-js

If you run a windows command line with administrator priviledges no sudo prefix is required. You can check if the package installed properly

npm list -g

To get started include vector-op.js in your web-site as follows, and exchange res/js/ with the respective path of your file.

<script type="text/javascript" src="res/js/vector-op.js"></script>

If you use node.js and require you can include the file via:

var vectorop = require('./vector-js')

Examples

• determine the maximum value for the left bitshift operation:

   vectorop.d2b(1 << 31)
   //> "-10000000000000000000000000000000"



   vectorop.d2b(1 << 32)
   //> "1"
   vectorop.d2b(1 << 33%32)
   //> "10"
   vectorop.d2b(1 << 33%32) === vectorop.d2b(1 << 33)
   //> true

• creating a new vector

   a=new vectorop.Vector(4, 10, 100)
   +a   //invoke a.toString();
   //> [x: 4, y: 10, z: 100]
   //> 6556164


- performing basic vector arithmetics

```javascript
   var a = vectorop.Vector(0, 3, 0);
   var b = vectorop.Vector(2, 0, 1);
   var c = vectorop.Vector(1, 0, 1);
   var d = vectorop.Vector(a + b - c);
   +d
   //> [x: 1, y: 3, z: 0]
   
   var scalarf = 1.3;
   var e = vectorop.Vector(d * scalarf);
   delete e; // delete the vector instance 'e'
   
   var a = new vectorop.Vector(10, 20, 30);
   var b = new vectorop.Vector(a/10);
   +b
   //> [x: 1, y: 2, z: 3]
   

• cross and dot product

   var a = new vectorop.Vector(3, 55, 12);
   var b = new vectorop.Vector(1, 2, 3);
   +a.dot(b)
   //> 149
   +a.cross(a)
   //> 0        //fails due to UInt8-type constraints
   +b.cross(a)
   //> [x: 115, y: 2, z: 49]
   //> 3211891

License

vector.js is released under the MIT license.

See also

• MDN valueOf
• JS Binary to Int, Hex, Decimal
• Vector to Matrix conversion