Ts-ECS

A naive implementation of the ECS pattern in typescript!

npm package can be found here

quick guide

• Be sure to checkout the wave shooter demo for a practical example
• Make sure to install the package, preferably through npm, but you could use the master branch if you want to, although expect breaking changes.

This is a WIP project and things are bound to change. I strive to make it as user friendly as possible, but there is a lot of work to do before i reach that goal. That being said. This is how you can use 1.4:

// create some types that represent components
interface Circle {
  radius: number;
}

interface Position {
  x: number;
  y: number;
}

interface Colored {
  color: string;
}

// create a manager
const manager = new ECSManager();

// register your types in the manager with default values
registerComponentType<Circle>(manager, { radius: 10 });
registerComponentType<Position>(manager, { x: 0, y: 0 });
registerComponentType<Colored>(manager, { color: '#ff0000' });

// create an entity and attach components to them
const { entityId } = manager.createEntity();
const radius = Math.random() * circleMaxSize;
addComponent<Circle>(manager, entityId, { radius: radius });
addComponent<Position>(manager, entityId, { x: Math.random() * canvas.width, y: Math.random() * canvas.height });
addComponent<Colored>(manager, entityId, { color: '#'+(Math.random()*0xFFFFFF<<0).toString(16) });

// create systems that will run each frame 
// all systems take in delta time as their first argument (the time since last frame)
// all other arguments needs to be wrapped in a Component<T>
const drawCircleSystem = (dt: number, circle: Component<Circle>, pos: Component<Position>, color: Component<Colored>) => {
    ctx.beginPath();
    ctx.strokeStyle = color.data.color;
    ctx.arc(pos.data.x, pos.data.y, circle.data.radius, 0, 2 * Math.PI);
    ctx.stroke();
}

// For simple query requirements ts-ecs can generate the query for you base on your system
// Simple meaning only "AND" so in this case we ask for all entities with circle and position and color
registerSystem(manager, drawCircleSystem);

manager.dispatch();

See the circle demo for a better overview of a simple application.

Using this project

This project utilizes typescript transformers. In order for it to work in your project you will have to enable the transformers. How you do this depends on the project facilities:

In Webpack

const managerEndpointsTransformer = require('naive-ts-ecs/manager-endpoints.transformer').default; // <--

module.exports = ['ts-loader'].map(loader => ({
   // ... omitted
    module: {
        rules: [
            {
                // ... omitted
                options: {
                    // make sure not to set `transpileOnly: true` here, otherwise it will not work
                    getCustomTransformers: program => ({
                        before: [
                            managerEndpointsTransformer(program)
                        ]
                    })
                }
            },
        ],
    },
}));

read more about webpack here

in ttypescript

Remeber to build using ttsc not tsc

{
    ...
    "compilerOptions": {
        ...
        "plugins": [
            { "transform": "naive-ts-ecs/manager-endpoints.transformer" },
        ]
    }
    ...
}

read more about ttypescript here

Documentation

Open index.html from the docs folder in a browser

You can also build the documentation using npm run doc

How to build

Make sure you have node and npm

Install dependencies:

npm install

To build:

npm run build

To run tests:

npm test

Examples

• You can check out my simple wave shooter implementation here
• Circle demo circle demo