Particles

You can show particles in your game, useful for representing rain, snow, fire, explosions etc!

You must first declare your particles:

var particles = {
    "Snow": {
        "particles": {
            "number": {
                "value": 400,
                "density": {
                    "enable": true,
                    "value_area": 800
                }
            },
            "color": {
                "value": "#fff"
            },
            "shape": {
                "type": "circle",
                "stroke": {
                    "width": 0,
                    "color": "#000000"
                },
                "polygon": {
                    "nb_sides": 5
                },
                "image": {
                    "src": "img\/github.svg",
                    "width": 100,
                    "height": 100
                }
            },
            "opacity": {
                "value": 0.5,
                "random": true,
                "anim": {
                    "enable": false,
                    "speed": 1,
                    "opacity_min": 0.1,
                    "sync": false
                }
            },
            "size": {
                "value": 10,
                "random": true,
                "anim": {
                    "enable": false,
                    "speed": 40,
                    "size_min": 0.1,
                    "sync": false
                }
            },
            "line_linked": {
                "enable": false,
                "distance": 500,
                "color": "#ffffff",
                "opacity": 0.4,
                "width": 2
            },
            "move": {
                "enable": true,
                "speed": 6,
                "direction": "bottom",
                "random": false,
                "straight": false,
                "out_mode": "out",
                "bounce": false,
                "attract": {
                    "enable": false,
                    "rotateX": 600,
                    "rotateY": 1200
                }
            }
        },
        "interactivity": {
            "detect_on": "canvas",
            "events": {
                "onhover": {
                "enable": true,
                "mode": "bubble"
            },
            "onclick": {
                "enable": true,
                "mode": "repulse"
            },
            "resize": true
        },
        "modes": {
            "grab": {
                "distance": 400,
                "line_linked": {
                    "opacity": 0.5
                }
            },
            "bubble": {
                "distance": 400,
                "size": 4,
                "duration": 0.3,
                "opacity": 1,
                "speed": 3
            },
            "repulse": {
                "distance": 200,
                "duration": 0.4
            },
            "push": {
                "particles_nb": 4
            },
            "remove": {
                "particles_nb": 2
            }
        }
    },
        "retina_detect": true
    }
}

Then, whenever you want to show them, just use the particles command:

"particles Snow"

And to stop them:

"stop particles"

If you want more examples, you can find them in the GitHub page of the library