lg-p5

Create p5.js instance as a Vue component.

Quick start

Script

<script src="https://unpkg.com/vue@2"></script>
<script src="https://unpkg.com/lg-p5"></script>

<div id="app">
  <lg-p5 v-on="this"></lg-p5>
</div>

<script>
new Vue({
  el: '#app',
  methods: {
    setup(sketch) {
      sketch.background('green');
      sketch.text('Hello p5!', 20, 20);
    }
  }
});
</script>

NPM

npm install --save vue@2 lg-p5

import Vue from 'vue';
import LgP5 from 'lg-p5';

export default {
  methods: {
    setup(sketch) {
      sketch.background('green');
      sketch.text('Hello p5!', 20, 20);
    }
  },
  render(h) {
    return h(LgP5, {on: this});
  }
};

Usage

v-on object syntax

In the examples above v-on="this" and {on: this} are a short (and hacky) way to avoid handling every p5 event explicitly. You might want to use one of the other options:

<lg-p5 v-on="{setup, draw, keypressed}"></lg-p5>
<!-- which is equivalent to: -->
<lg-p5
    @setup="setup"
    @draw="draw"
    @keypressed="keypressed">
</lg-p5>

on: {
  setup: this.setup,
  draw: this.draw,
  keypressed: this.keypressed
}

See also v-on object syntax.

Events - p5 and Vue

Every p5 event is exposed as a Vue event. The first argument is the sketch object used for drawing and everything else:

methods: {
  draw(sk) {
    // draw a line between the previous
    // and the current mouse position
    sk.line(sk.pmouseX, sk.pmouseY, sk.mouseX, sk.mouseY);
  },
  keypressed(sk) {
    // convert the key code to it's string
    // representation and print it
    const key = String.fromCharCode(sk.keyCode);
    sk.print(key);
  }
}

Using methods makes it possible to access the current component:

// green background
data: {
  color: [0, 255, 0]
},
methods: {
  draw(sketch) {
    sketch.background(...this.color);
  }
}

Event names

Each event emitted by lg-p5 has the same name as the corresponding p5 event, but lowercase.

mouseclicked, not ~~mouseClicked~~.

Missing events

Currently all p5 events [are supported], but there is an escape hatch. For example, if windowResized was missing, it's (lowercase) name could be passed to additional-events prop to make lg-p5 aware of it:

<lg-p5
  :additional-events="['windowresized']"
  @windowresized="windowresized"
></lg-p5>

Importing existing sketches

In addition to p5 events, there's a @sketch event for importing an existing p5 sketch written in instance mode.

<lg-p5 @sketch="sketch"></lg-p5>

<script>
new Vue({
  methods: {
    sketch(sk) {
      const clicks = [];

      sk.mouseClicked = () => {
        // save clicks to array
        clicks.push({ x: sk.mouseX, y: sk.mouseY });
      }

      sk.draw = () => {
        // draw a circle around each clicked position
        clicks.forEach(({ x, y }) => {
          sk.ellipse(x, y, 10, 10);
        });
      }
    }
  }
});
</script>

Remember to use arrow functions if you need this.

@sketch can be used in parallel with other events. Functions defined in the @sketch handler will always be called first.