Added some colour. Update: Added colour shift for sun-rise/set.
Created
November 22, 2016 01:08
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Lightrays v2
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var canvas, c, w, h, | |
twoPI = Math.PI * 2, | |
mX, mY, | |
resize = true, | |
mousemove = true, | |
per = { x: 0, y: 0 }, | |
mtn, trackmouse = false; | |
window.onload = function(){ | |
canvas = document.createElement('canvas') | |
w = canvas.width = window.innerWidth - 40; | |
h = canvas.height = window.innerHeight - 40; | |
c = canvas.getContext('2d'); | |
document.body.appendChild(canvas); | |
!resize || window.addEventListener('resize', function(e){ w = canvas.width = window.innerWidth - 40; h = canvas.height = window.innerHeight - 40; }); | |
!mousemove || canvas.addEventListener('mousemove', function(e){ | |
trackmouse = true; | |
mX = e.pageX-20; mY = e.pageY-20; | |
per = { x: mX, y: mY }; | |
}); | |
mX = w/2; | |
mY = w/2; | |
per = { x: w/2, y: h/2, step: 1 } | |
mtn = new Mountains(300,"10"); | |
window.setInterval(animate,17); | |
} | |
function newGradient(gradient){ | |
var grad; | |
switch(gradient.type){ | |
case "radial": | |
grad = c.createRadialGradient(gradient.x1, gradient.y1, gradient.r1, gradient.x1, gradient.y1, gradient.r2); | |
break; | |
case "linear": | |
grad = c.createLinearGradient(gradient.x1, gradient.y1, gradient.x2, gradient.y2); | |
break; | |
} | |
for(var i = 0; i < gradient.stops.length; i++){ | |
grad.addColorStop(gradient.stops[i].s, gradient.stops[i].c); | |
} | |
return grad; | |
} | |
function animate(){ | |
if(!trackmouse){ | |
per.x = mX = w/2 + Math.round(Math.cos(per.step)*w/2); | |
per.y = mY = h/2 + Math.round(Math.sin(per.step)*h/2); | |
per.step += 0.03; | |
if(per.step > twoPI) | |
per.step = 0; | |
} | |
c.save(); | |
c.globalCompositeOperation = "source-over"; | |
c.fillStyle = newGradient( | |
{ | |
type: "radial", | |
x1: mX, | |
y1: mY, | |
r1: 0, | |
r2: w, | |
stops: [ | |
{ s: 0, c: "rgba("+ (h-mY) +","+ (h-mY) +","+ (h-mY) +",0.5)" }, | |
{ s: 0.05, c: "rgba("+ (h-mY) +","+ (h-mY-128) +",128,0.5)" }, | |
{ s: 1, c: "rgba(0,"+ (h-mY-128) +","+ (h-mY) +",0.5)" } | |
] | |
} | |
); | |
c.fillRect(0,0,w,h); | |
mtn.draw(); | |
} | |
function Mountains(peaks,seed){ | |
var points = []; | |
this.init = function(){ | |
var step = w / peaks, | |
y = 0; | |
points.push({x: 0, y: y}); | |
for(var i = 1; i <= peaks; i++){ | |
y = y + (Math.random() * 20)-10; | |
points.push({x: i * step, y: y}); | |
} | |
}; | |
this.draw = function(){ | |
c.save(); | |
//c.fillStyle = "rgba(20,20,20,1)"; | |
c.fillStyle = newGradient({type:"linear", x1: 0, y1: 0, x2: 0, y2: h, stops: [{s:1, c:"rgba(0,0,0,1)"},{s:0, c:"rgba(80,80,80,1)"}]}); | |
c.beginPath(); | |
c.moveTo(points[0].x, h/2-points[0].y); | |
for(var p = 1; p < points.length; p++){ | |
c.lineTo(points[p].x, h/2 - points[p].y); | |
} | |
c.lineTo(w,h); | |
c.lineTo(0,h); | |
c.closePath(); | |
c.fill(); | |
c.restore(); | |
c.globalCompositeOperation = "lighter"; | |
c.fillStyle = "rgba("+(h-mY)+","+(h-mY)+","+(h-mY)+",0.03)"; | |
for(var p = 0; p < points.length-1; p++){ | |
var va1 = Math.atan2(h/2-points[p].y - per.y, points[p].x - per.x), | |
va2 = Math.atan2(h/2-points[p+1].y - per.y, points[p+1].x - per.x); | |
c.beginPath(); | |
c.moveTo(points[p ].x, h/2-points[p].y); | |
c.lineTo(points[p+1].x, h/2-points[p+1].y); | |
c.lineTo(points[p+1].x + Math.cos(va2)*w, h/2-points[p+1].y + Math.sin(va2)*w); | |
c.lineTo(points[p ].x + Math.cos(va1)*w, h/2-points[p].y + Math.sin(va1)*w); | |
c.closePath(); | |
c.fill(); | |
} | |
}; | |
this.init(); | |
} |
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<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> |
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*{margin:0;padding:0;-moz-box-sizing:border-box;-webkit-box-sizing:border-box} | |
body{font-size:75%;background:#222;font-family:arial;padding:20px 0 0 20px} | |
canvas{border:1px solid #181818;display:block;box-shadow:0 0 10px #111;background:rgba(20,20,20,1)} |
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