[ Mousemove / TouchSwipe || Click/Tap to Add ]
Interactive 3D system inspired by the Boötes constellation:
A Pen by Tiffany Rayside on CodePen.
[ Mousemove / TouchSwipe || Click/Tap to Add ]
Interactive 3D system inspired by the Boötes constellation:
A Pen by Tiffany Rayside on CodePen.
<!-- | |
Mousemove / TouchSwipe | |
Click / Tap to add stars / density | |
Boötes /boʊˈoʊtiːz/ | |
One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars. | |
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<canvas id="canv"></canvas> | |
var num = 200; | |
var w = window.innerWidth; | |
var h = window.innerHeight; | |
var max = 100; | |
var _x = 0; | |
var _y = 0; | |
var _z = 150; | |
var dtr = function(d) { | |
return d * Math.PI / 180; | |
}; | |
var rnd = function() { | |
return Math.sin(Math.floor(Math.random() * 360) * Math.PI / 180); | |
}; | |
var dist = function(p1, p2, p3) { | |
return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) + Math.pow(p2.z - p1.z, 2)); | |
}; | |
var cam = { | |
obj: { x: _x,y: _y, z: _z}, | |
dest: {x: 0, y: 0,z: 1}, | |
dist: {x: 0,y: 0,z: 200}, | |
ang: {cplane: 0,splane: 0,ctheta: 0,stheta: 0}, | |
zoom: 1, | |
disp: {x: w / 2,y: h / 2,z: 0}, | |
upd: function() { | |
cam.dist.x = cam.dest.x - cam.obj.x; | |
cam.dist.y = cam.dest.y - cam.obj.y; | |
cam.dist.z = cam.dest.z - cam.obj.z; | |
cam.ang.cplane = -cam.dist.z / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z); | |
cam.ang.splane = cam.dist.x / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z); | |
cam.ang.ctheta = Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z); | |
cam.ang.stheta = -cam.dist.y / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z); | |
} | |
}; | |
var trans = { | |
parts: { | |
sz: function(p, sz) { | |
return { | |
x: p.x * sz.x, | |
y: p.y * sz.y, | |
z: p.z * sz.z | |
}; | |
}, | |
rot: { | |
x: function(p, rot) { | |
return { | |
x: p.x, | |
y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)), | |
z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x)) | |
}; | |
}, | |
y: function(p, rot) { | |
return { | |
x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)), | |
y: p.y, | |
z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y)) | |
}; | |
}, | |
z: function(p, rot) { | |
return { | |
x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)), | |
y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)), | |
z: p.z | |
}; | |
} | |
}, | |
pos: function(p, pos) { | |
return { | |
x: p.x + pos.x, | |
y: p.y + pos.y, | |
z: p.z + pos.z | |
}; | |
} | |
}, | |
pov: { | |
plane: function(p) { | |
return { | |
x: p.x * cam.ang.cplane + p.z * cam.ang.splane, | |
y: p.y, | |
z: p.x * -cam.ang.splane + p.z * cam.ang.cplane | |
}; | |
}, | |
theta: function(p) { | |
return { | |
x: p.x, | |
y: p.y * cam.ang.ctheta - p.z * cam.ang.stheta, | |
z: p.y * cam.ang.stheta + p.z * cam.ang.ctheta | |
}; | |
}, | |
set: function(p) { | |
return { | |
x: p.x - cam.obj.x, | |
y: p.y - cam.obj.y, | |
z: p.z - cam.obj.z | |
}; | |
} | |
}, | |
persp: function(p) { | |
return { | |
x: p.x * cam.dist.z / p.z * cam.zoom, | |
y: p.y * cam.dist.z / p.z * cam.zoom, | |
z: p.z * cam.zoom, | |
p: cam.dist.z / p.z | |
}; | |
}, | |
disp: function(p, disp) { | |
return { | |
x: p.x + disp.x, | |
y: -p.y + disp.y, | |
z: p.z + disp.z, | |
p: p.p | |
}; | |
}, | |
steps: function(_obj_, sz, rot, pos, disp) { | |
var _args = trans.parts.sz(_obj_, sz); | |
_args = trans.parts.rot.x(_args, rot); | |
_args = trans.parts.rot.y(_args, rot); | |
_args = trans.parts.rot.z(_args, rot); | |
_args = trans.parts.pos(_args, pos); | |
_args = trans.pov.plane(_args); | |
_args = trans.pov.theta(_args); | |
_args = trans.pov.set(_args); | |
_args = trans.persp(_args); | |
_args = trans.disp(_args, disp); | |
return _args; | |
} | |
}; | |
(function() { | |
"use strict"; | |
var threeD = function(param) { | |
this.transIn = {}; | |
this.transOut = {}; | |
this.transIn.vtx = (param.vtx); | |
this.transIn.sz = (param.sz); | |
this.transIn.rot = (param.rot); | |
this.transIn.pos = (param.pos); | |
}; | |
threeD.prototype.vupd = function() { | |
this.transOut = trans.steps( | |
this.transIn.vtx, | |
this.transIn.sz, | |
this.transIn.rot, | |
this.transIn.pos, | |
cam.disp | |
); | |
}; | |
var Build = function() { | |
this.vel = 0.04; | |
this.lim = 360; | |
this.diff = 200; | |
this.initPos = 100; | |
this.toX = _x; | |
this.toY = _y; | |
this.go(); | |
}; | |
Build.prototype.go = function() { | |
this.canvas = document.getElementById("canv"); | |
this.canvas.width = window.innerWidth; | |
this.canvas.height = window.innerHeight; | |
this.$ = canv.getContext("2d"); | |
this.$.globalCompositeOperation = 'source-over'; | |
this.varr = []; | |
this.dist = []; | |
this.calc = []; | |
for (var i = 0, len = num; i < len; i++) { | |
this.add(); | |
} | |
this.rotObj = {x: 0,y: 0,z: 0}; | |
this.objSz = {x: w / 5,y: h / 5,z: w / 5}; | |
}; | |
Build.prototype.add = function() { | |
this.varr.push(new threeD({ | |
vtx: {x: rnd(),y: rnd(),z: rnd()}, | |
sz: {x: 0,y: 0,z: 0}, | |
rot: {x: 20,y: -20,z: 0}, | |
pos: { | |
x: this.diff * Math.sin(360 * Math.random() * Math.PI / 180), | |
y: this.diff * Math.sin(360 * Math.random() * Math.PI / 180), | |
z: this.diff * Math.sin(360 * Math.random() * Math.PI / 180) | |
} | |
})); | |
this.calc.push({ | |
x: 360 * Math.random(), | |
y: 360 * Math.random(), | |
z: 360 * Math.random() | |
}); | |
}; | |
Build.prototype.upd = function() { | |
cam.obj.x += (this.toX - cam.obj.x) * 0.05; | |
cam.obj.y += (this.toY - cam.obj.y) * 0.05; | |
}; | |
Build.prototype.draw = function() { | |
this.$.clearRect(0, 0, this.canvas.width, this.canvas.height); | |
cam.upd(); | |
this.rotObj.x += 0.1; | |
this.rotObj.y += 0.1; | |
this.rotObj.z += 0.1; | |
for (var i = 0; i < this.varr.length; i++) { | |
for (var val in this.calc[i]) { | |
if (this.calc[i].hasOwnProperty(val)) { | |
this.calc[i][val] += this.vel; | |
if (this.calc[i][val] > this.lim) this.calc[i][val] = 0; | |
} | |
} | |
this.varr[i].transIn.pos = { | |
x: this.diff * Math.cos(this.calc[i].x * Math.PI / 180), | |
y: this.diff * Math.sin(this.calc[i].y * Math.PI / 180), | |
z: this.diff * Math.sin(this.calc[i].z * Math.PI / 180) | |
}; | |
this.varr[i].transIn.rot = this.rotObj; | |
this.varr[i].transIn.sz = this.objSz; | |
this.varr[i].vupd(); | |
if (this.varr[i].transOut.p < 0) continue; | |
var g = this.$.createRadialGradient(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p, this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p*2); | |
this.$.globalCompositeOperation = 'lighter'; | |
g.addColorStop(0, 'hsla(255, 255%, 255%, 1)'); | |
g.addColorStop(.5, 'hsla('+(i+2)+',85%, 40%,1)'); | |
g.addColorStop(1,'hsla('+(i)+',85%, 40%,.5)'); | |
this.$.fillStyle = g; | |
this.$.beginPath(); | |
this.$.arc(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2, 0, Math.PI * 2, false); | |
this.$.fill(); | |
this.$.closePath(); | |
} | |
}; | |
Build.prototype.anim = function() { | |
window.requestAnimationFrame = (function() { | |
return window.requestAnimationFrame || | |
function(callback, element) { | |
window.setTimeout(callback, 1000 / 60); | |
}; | |
})(); | |
var anim = function() { | |
this.upd(); | |
this.draw(); | |
window.requestAnimationFrame(anim); | |
}.bind(this); | |
window.requestAnimationFrame(anim); | |
}; | |
Build.prototype.run = function() { | |
this.anim(); | |
window.addEventListener('mousemove', function(e) { | |
this.toX = (e.clientX - this.canvas.width / 2) * -0.8; | |
this.toY = (e.clientY - this.canvas.height / 2) * 0.8; | |
}.bind(this)); | |
window.addEventListener('touchmove',function(e){ | |
e.preventDefault(); | |
this.toX = (e.touches[0].clientX - this.canvas.width / 2) * -0.8; | |
this.toY = (e.touches[0].clientY - this.canvas.height / 2) * 0.8; | |
}.bind(this)); | |
window.addEventListener('mousedown', function(e) { | |
for (var i = 0; i < 100; i++) { | |
this.add(); | |
} | |
}.bind(this)); | |
window.addEventListener('touchstart', function(e) { | |
e.preventDefault(); | |
for (var i = 0; i < 100; i++) { | |
this.add(); | |
} | |
}.bind(this)); | |
}; | |
var app = new Build(); | |
app.run(); | |
})(); | |
window.addEventListener('resize',function(){ | |
canvas.width = w = window.innerWidth; | |
canvas.height = h = window.innerHeight; | |
}, false); |
html { | |
height: 100%; | |
background-image: radial-gradient(ellipse farthest-corner at center top, hsla(230, 100%, 15%, 1) 0%, hsla(231, 90%, 1%, 1) 100%); | |
cursor: move; | |
} | |
body { | |
width: 100%; | |
margin: 0; | |
overflow: hidden; | |
} |