This commit is contained in:
Timm Szigat 2014-10-26 14:56:51 +01:00
parent b4415b675e
commit b51339fb98

View File

@ -1,17 +1,16 @@
(function() { (function() {
var width, height, largeHeader, canvas, ctx, lines, target, size, animateHeader = true; var width, height, largeHeader, canvas, ctx, points, target, animateHeader = true;
// Main // Main
initHeader(); initHeader();
addListeners();
initAnimation(); initAnimation();
addListeners();
function initHeader() { function initHeader() {
width = window.innerWidth; width = window.innerWidth;
height = window.innerHeight; height = 500;
size = width > height ? height : width; target = {x: width/2, y: height/2};
target = {x: 0, y: height};
largeHeader = document.getElementById('large-header'); largeHeader = document.getElementById('large-header');
largeHeader.style.height = height+'px'; largeHeader.style.height = height+'px';
@ -21,24 +20,77 @@
canvas.height = height; canvas.height = height;
ctx = canvas.getContext('2d'); ctx = canvas.getContext('2d');
// create particles // create points
lines = []; points = [];
for(var i = 0; i < 90; i++) { for(var x = 0; x < width; x = x + width/20) {
var l = new Line(Math.random()*360); for(var y = 0; y < height; y = y + height/20) {
lines.push(l); var px = x + Math.random()*width/20;
var py = y + Math.random()*height/20;
var p = {x: px, originX: px, y: py, originY: py };
points.push(p);
} }
} }
function initAnimation() { // for each point find the 5 closest points
animate(); for(var i = 0; i < points.length; i++) {
var closest = [];
var p1 = points[i];
for(var j = 0; j < points.length; j++) {
var p2 = points[j]
if(!(p1 == p2)) {
var placed = false;
for(var k = 0; k < 5; k++) {
if(!placed) {
if(closest[k] == undefined) {
closest[k] = p2;
placed = true;
}
}
}
for(var k = 0; k < 5; k++) {
if(!placed) {
if(getDistance(p1, p2) < getDistance(p1, closest[k])) {
closest[k] = p2;
placed = true;
}
}
}
}
}
p1.closest = closest;
}
// assign a circle to each point
for(var i in points) {
var c = new Circle(points[i], 2+Math.random()*2, 'rgba(255,255,255,0.3)');
points[i].circle = c;
}
} }
// Event handling // Event handling
function addListeners() { function addListeners() {
if(!('ontouchstart' in window)) {
window.addEventListener('mousemove', mouseMove);
}
window.addEventListener('scroll', scrollCheck); window.addEventListener('scroll', scrollCheck);
window.addEventListener('resize', resize); window.addEventListener('resize', resize);
} }
function mouseMove(e) {
var posx = posy = 0;
if (e.pageX || e.pageY) {
posx = e.pageX;
posy = e.pageY;
}
else if (e.clientX || e.clientY) {
posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
}
target.x = posx;
target.y = posy;
}
function scrollCheck() { function scrollCheck() {
if(document.body.scrollTop > height) animateHeader = false; if(document.body.scrollTop > height) animateHeader = false;
else animateHeader = true; else animateHeader = true;
@ -46,55 +98,88 @@
function resize() { function resize() {
width = window.innerWidth; width = window.innerWidth;
height = window.innerHeight; height = 500;
size = width > height ? height : width;
largeHeader.style.height = height+'px'; largeHeader.style.height = height+'px';
canvas.width = width; canvas.width = width;
canvas.height = height; canvas.height = height;
} }
// animation
function initAnimation() {
animate();
for(var i in points) {
shiftPoint(points[i]);
}
}
function animate() { function animate() {
if(animateHeader) { if(animateHeader) {
ctx.clearRect(0,0,width,height); ctx.clearRect(0,0,width,height);
for(var i in lines) { for(var i in points) {
lines[i].draw(); // detect points in range
if(Math.abs(getDistance(target, points[i])) < 4000) {
points[i].active = 0.3;
points[i].circle.active = 0.6;
} else if(Math.abs(getDistance(target, points[i])) < 20000) {
points[i].active = 0.1;
points[i].circle.active = 0.3;
} else if(Math.abs(getDistance(target, points[i])) < 40000) {
points[i].active = 0.02;
points[i].circle.active = 0.1;
} else {
points[i].active = 0;
points[i].circle.active = 0;
}
drawLines(points[i]);
points[i].circle.draw();
} }
} }
requestAnimationFrame(animate); requestAnimationFrame(animate);
} }
function shiftPoint(p) {
TweenLite.to(p, 1+1*Math.random(), {x:p.originX-50+Math.random()*100,
y: p.originY-50+Math.random()*100, ease:Circ.easeInOut,
onComplete: function() {
shiftPoint(p);
}});
}
// Canvas manipulation // Canvas manipulation
function Line(angle) { function drawLines(p) {
if(!p.active) return;
for(var i in p.closest) {
ctx.beginPath();
ctx.moveTo(p.x, p.y);
ctx.lineTo(p.closest[i].x, p.closest[i].y);
ctx.strokeStyle = 'rgba(156,217,249,'+ p.active+')';
ctx.stroke();
}
}
function Circle(pos,rad,color) {
var _this = this; var _this = this;
// constructor // constructor
(function() { (function() {
_this.angle = angle; _this.pos = pos || null;
_this.radius = rad || null;
_this.color = color || null;
})(); })();
this.draw = function() { this.draw = function() {
if(!_this.active) return;
var r1 = Math.random()*(size < 400 ? 400 : size)*0.4;
var r2 = Math.random()*(size < 400 ? 400 : size)*0.4;
var x1 = r1*Math.cos(_this.angle*(Math.PI/180)) + width*0.5;
var y1 = r1*Math.sin(_this.angle*(Math.PI/180)) + height*0.48;
var x2 = r2*Math.cos(_this.angle*(Math.PI/180)) + width*0.5;
var y2 = r2*Math.sin(_this.angle*(Math.PI/180)) + height*0.48;
ctx.beginPath(); ctx.beginPath();
ctx.moveTo(x1, y1); ctx.arc(_this.pos.x, _this.pos.y, _this.radius, 0, 2 * Math.PI, false);
ctx.lineTo(x2, y2); ctx.fillStyle = 'rgba(156,217,249,'+ _this.active+')';
ctx.strokeStyle = 'rgba(255,193,127,'+(0.5+Math.random()*0.5)+')';
ctx.stroke();
ctx.beginPath();
ctx.arc(x1, y1, 2, 0, 2 * Math.PI, false);
ctx.fillStyle = 'rgba(255,165,70,'+(0.5+Math.random()*0.5)+')';
ctx.fill(); ctx.fill();
_this.angle += Math.random();
}; };
} }
// Util
function getDistance(p1, p2) {
return Math.pow(p1.x - p2.x, 2) + Math.pow(p1.y - p2.y, 2);
}
})(); })();