src/main/webapp/resources/assets2/js/canvas-bg-web-5.js

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var canvas = document.getElementById('canvas'),
        ctx = canvas.getContext('2d')
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
    ctx.lineWidth = .3;
    ctx.strokeStyle = (new Color(150)).style;

    var mousePosition = {
        x: 30 * canvas.width / 100,
        y: 30 * canvas.height / 100
    };

    var dots = {
        nb: 750,
        distance: 50,
        d_radius: 100,
        array: []
    };

    function colorValue(min) {
        return Math.floor(Math.random() * 255 + min);
    }

    function createColorStyle(r, g, b) {
        return 'rgba(' + r + ',' + g + ',' + b + ', 0.8)';
    }

    function mixComponents(comp1, weight1, comp2, weight2) {
        return (comp1 * weight1 + comp2 * weight2) / (weight1 + weight2);
    }

    function averageColorStyles(dot1, dot2) {
        var color1 = dot1.color,
            color2 = dot2.color;

        var r = mixComponents(color1.r, dot1.radius, color2.r, dot2.radius),
            g = mixComponents(color1.g, dot1.radius, color2.g, dot2.radius),
            b = mixComponents(color1.b, dot1.radius, color2.b, dot2.radius);
        return createColorStyle(Math.floor(r), Math.floor(g), Math.floor(b));
    }

    function Color(min) {
        min = min || 0;
        this.r = colorValue(min);
        this.g = colorValue(min);
        this.b = colorValue(min);
        this.style = createColorStyle(this.r, this.g, this.b);
    }

    function Dot() {
        this.x = Math.random() * canvas.width;
        this.y = Math.random() * canvas.height;

        this.vx = -.5 + Math.random();
        this.vy = -.5 + Math.random();

        this.radius = Math.random() * 2;

        this.color = new Color();
        // console.log(this);