#  SDF-2D library
A graphics library to enable the rendering of 2D signed distance fields (SDF-s) on web.
[View it in action!](https://sdf2d.schmelczer.dev)
> Further documentation will be provided by the end of September 2020.
- [Minimal example using Webpack](#minimal-example-using-webpack)
- [Instructions](#instructions)
- [End result](#end-result)
- [More complex example](#more-complex-example)
- [Instructions](#instructions-1)
- [End result](#end-result-1)
- [Real life example](#real-life-example)
## Minimal example using Webpack
> Certainly, other build tools can be used as well.
### Instructions
> A tutorial for installing Webpack is also included below, for more information about Webpack visit [their getting started page](https://webpack.js.org/guides/getting-started/).
- Install [Node.js](https://nodejs.org/en/)
- Create a directory called `sdf-2d-example` and open a terminal inside it
- Run the following commands
```sh
npm init -y
npm install webpack webpack-cli sdf-2d --save-dev
```
- Create a directory called `src`, and a new file inside of it named `index.html`
- Copy the following code into `sdf-2d-example/dist/index.html`
```html
```
- Create a directory called `src`, and a new file inside of it named `index.js`
- Copy the following code into `sdf-2d-example/src/index.js`
```js
import { compile, Circle, CircleLight } from 'sdf-2d';
const main = async () => {
const canvas = document.querySelector('canvas');
const renderer = await compile(canvas, [Circle.descriptor, CircleLight.descriptor]);
renderer.addDrawable(new Circle([200, 200], 50));
renderer.addDrawable(new CircleLight([500, 300], [1, 0.5, 0], 0.5));
renderer.renderDrawables();
};
main();
```
- Inside `sdf-2d-example`, execute the command `npx webpack`, this will generate a new file in your `dist` folder.
- You're finished, open `sdf-2d-example/dist/index.html`
### End result
The result of the above instructions can also be found [in this repository](https://github.com/schmelczerandras/sdf-2d-minimal-example) and the finished website is [available here](https://schmelczerandras.github.io/sdf-2d-minimal-example/dist/index.html).
## More complex example
### Instructions
We'll be using the files and directory structure created in the [minimal example](#minimal-example-using-webpack).
- Paste the following `HTML` into the `` of `index.html`
```html
```
- Install [gl-matrix](http://glmatrix.net/docs/) by running `npm install gl-matrix --save-dev`
- Copy the following code into `index.js`
```js
import { vec2, vec3 } from 'gl-matrix';
import { compile, Circle, CircleLight } from 'sdf-2d';
const main = async () => {
const canvas = document.querySelector('canvas');
const renderer = await compile(canvas, [Circle.descriptor, CircleLight.descriptor]);
renderer.setRuntimeSettings({
colorPalette: [
vec3.create(),
vec3.create(),
vec3.fromValues(0.5, 0.2, 1), // By default, Circle has a colorIndex of 2
],
});
let aspectRatio;
const setViewArea = () => {
const canvasSize = renderer.canvasSize;
aspectRatio = canvasSize.x / canvasSize.y;
// The view area is given in a coordinate system
// originated from the bottom (!) left edge of the canvas
renderer.setViewArea(vec2.fromValues(0, 1), vec2.fromValues(aspectRatio, 1));
};
setViewArea();
onresize = setViewArea;
const circle = new Circle(vec2.fromValues(0.5, 0.5), 0.1);
const light = new CircleLight(vec2.create(), vec3.fromValues(1, 0.5, 0.1), 0.0005);
const animate = (currentTime) => {
vec2.set(circle.center, aspectRatio / 2, 0.5);
vec2.set(light.center, ((Math.sin(currentTime / 1000) + 1) / 2) * aspectRatio, 1);
renderer.addDrawable(circle);
renderer.addDrawable(light);
renderer.renderDrawables();
console.log(renderer.insights);
requestAnimationFrame(animate);
};
requestAnimationFrame(animate);
};
main();
```
- Run `npx webpack`
- You're finished, open `index.html`
### End result
The result of the above instructions can also be found [in this repository](https://github.com/schmelczerandras/sdf-2d-more-complex-example) and the finished website is [available here](https://schmelczerandras.github.io/sdf-2d-more-complex-example/dist/index.html).
## Real life example
The source code for the [demo page](https://sdf2d.schmelczer.dev) of this library is available [here, on GitHub](https://github.com/schmelczerandras/sdf-2d-demo).