Theme for twister
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$(function(){
var header = $('.bgdl'),
canvas = $('<canvas></canvas>').appendTo(header)[0],
ctx = canvas.getContext('2d'),
color = 'black',
idle = null, mousePosition;
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
canvas.style.display = 'block';
ctx.fillStyle = color;
ctx.lineWidth = .1;
ctx.strokeStyle = color;
var mousePosition = { x: 30 * canvas.width / 100, y: 30 * canvas.height / 100 },
dots = { nb: (canvas.width < 640 ? 35 : 150), distance: 80, d_radius: 150, array: [] };
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();
}
Dot.prototype = {
create: function(){
ctx.beginPath();
ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
ctx.fill();
},
animate: function(){
for(var i = 0, dot=false; i < dots.nb; i++){
dot = dots.array[i];
if(dot.y < 0 || dot.y > canvas.height){
dot.vx = dot.vx;
dot.vy = - dot.vy;
}else if(dot.x < 0 || dot.x > canvas.width){
dot.vx = - dot.vx;
dot.vy = dot.vy;
}
dot.x += dot.vx;
dot.y += dot.vy;
}
},
line: function(){
for(var i = 0; i < dots.nb; i++){
for(var j = 0; j < dots.nb; j++){
i_dot = dots.array[i];
j_dot = dots.array[j];
if((i_dot.x - j_dot.x) < dots.distance && (i_dot.y - j_dot.y) < dots.distance && (i_dot.x - j_dot.x) > - dots.distance && (i_dot.y - j_dot.y) > - dots.distance){
if((i_dot.x - mousePosition.x) < dots.d_radius && (i_dot.y - mousePosition.y) < dots.d_radius && (i_dot.x - mousePosition.x) > - dots.d_radius && (i_dot.y - mousePosition.y) > - dots.d_radius){
ctx.beginPath();
ctx.moveTo(i_dot.x, i_dot.y);
ctx.lineTo(j_dot.x, j_dot.y);
ctx.stroke();
ctx.closePath();
}
}
}
}
}
};
function createDots(){
ctx.clearRect(0, 0, canvas.width, canvas.height);
for(var i = 0; i < dots.nb; i++){
dots.array.push(new Dot());
dot = dots.array[i];
dot.create();
}
dot.line();
dot.animate();
}
idle = setInterval(createDots, 1000/30);
$(canvas).on('mousemove mouseleave', function(e){
if(e.type == 'mousemove'){
mousePosition.x = e.pageX;
mousePosition.y = e.pageY;
}
if(e.type == 'mouseleave'){
mousePosition.x = canvas.width / 2;
mousePosition.y = canvas.height / 2;
}
});
});