下面是HTML代碼，JS代碼過多，所以我就以文件的形式給大家放上面了，大家登陸賬號下載就可以學習代碼了。
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>編程特趣</title>
<script type="text/javascript" src="js/jquery.min.js"></script>
<style>
body, html {
margin: 0px;
padding: 0px;
overflow: hidden;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
$(function() {
//Indention is a bit f*d up
//Set animation frame
window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
var canvas = $('#canvas')[0],
ctx = canvas.getContext('2d'),
canvasW = $(document).width(),
canvasH = $(document).height();
ctx.fillStyle = 'black';
canvas.width = canvasW;
canvas.height = canvasH;
var mouse = {
x: canvasW/2,
y: canvasH/2,
dx: 0,
dy: 0
};
var emitter = {
h: 50,
x: canvasW/2-250,
y: canvasH/2,
vx: 5,
vy: 5,
v: 0.05,
dx: 0,
dy: 0
};
var stops = [50, 150, 160, 300, 500],
stopIndex = 0,
delay = 0,
prog = 0;
var circle = {
radius: 125,
angle: 0
};
var particles = new Array();
var rate = 2,
time = 0,
frameIndex = rate;
var simplex = new SimplexNoise(),
simplexVal = 0,
simplexStart = 20;
//Start loop
draw();
//Draw
function draw() {
ctx.globalCompositeOperation = 'source-over';
ctx.fillStyle = 'rgba(0,0,0,0.5)';
ctx.fillRect(0, 0, canvasW, canvasH);
ctx.globalCompositeOperation = 'lighter';
//Draw loading
ctx.fillStyle = '#000';
ctx.fillRect(canvasW/2-250, emitter.y-emitter.h/2, 500, emitter.h);
ctx.strokeStyle = 'rgba(0,255,0,0.5)';
ctx.strokeRect(canvasW/2-250, emitter.y-emitter.h/2, 500, emitter.h);
ctx.font = '20pt Arial';
ctx.fillStyle = 'rgba(0,255,0,0.5)';
ctx.fillText(Math.floor(prog/5)+'%', canvasW/2-20, canvasH/2+10);
//Move emitter
//console.log(stops[stopIndex]+' '+prog+' '+delay);
if(stops[stopIndex] == prog) {
stopIndex ++;
delay = 50;
} else {
if(delay == 0 && prog < stops[stopIndex]) {
emitter.dx = -1;
emitter.x += 2;
prog += 2;
} else {
emitter.dx = 0;
delay --;
}
}
//Draw emitter
ctx.fillStyle = '#0f0';
ctx.fillRect(emitter.x, emitter.y-emitter.h/2, 1, emitter.h);
//Draw particles
var i = 0;
for(i in particles) {
var p = particles[i];
//Check if die
if(time > p.die) {
p.o -= 0.01;
if(p.o < 0) {
particles.splice(i, 1);
}
}
//Add v
p.x += p.vx;
p.y += p.vy;
//Add source move
p.x += p.sourcedx / 10;
p.y += p.sourcedy / 10;
//Simplex noise
if(p.simplexIndex > simplexStart) {
p.simplexVal = simplex.noise3D(p.x/100, p.y/100, time/100);
}
p.simplexIndex ++;
p.x += p.simplexVal;
p.y += p.simplexVal;
//If (almost) outside canvas
if(p.x < 0+20 || p.x > canvasW-20) {
p.vx *= -1.015;
}
if(p.y < 0+20 || p.y > canvasH-20) {
p.vy *= -1.015;
}
ctx.beginPath();
ctx.fillStyle = 'rgba(0, '+p.green+', 0, '+p.o+')';
ctx.arc(p.x, p.y, p.r, 0, 2 * Math.PI, true);
ctx.fill();
ctx.save();
}
//if emitter is moving
if(emitter.dx !== 0) {
for(var i=0; i<rate; i++) {
//Create particle
var particle = {
x: emitter.x,
y: emitter.y+(Math.random()*emitter.h-emitter.h/2),
r: Math.random()+0.5,
vx: (Math.random()*-2),
vy: (Math.random()-0.5),
o: 1,
birth: time,
die: time+(Math.random()*50+50),//1+1),
sourcedx: emitter.dx,
sourcedy: emitter.dy,
red: Math.round(Math.random()*255),
green: Math.round(Math.random()*255),
blue: Math.round(Math.random()*255),
simplexVal: 0,
simplexIndex: 0
};
particles.push(particle);
}
}
time++;
window.requestAnimationFrame(draw);
}
$(window).mousemove(function(e) {
mouse.dx = e.pageX - mouse.x;
mouse.dy = e.pageY - mouse.y;
mouse.x = e.pageX;
mouse.y = e.pageY;
});
});
/*
* A fast javascript implementation of simplex noise by Jonas Wagner
*
* Based on a speed-improved simplex noise algorithm for 2D, 3D and 4D in Java.
* Which is based on example code by Stefan Gustavson ([email protected]).
* With Optimisations by Peter Eastman ([email protected]).
* Better rank ordering method by Stefan Gustavson in 2012.
*
*
* Copyright (C) 2012 Jonas Wagner
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
(function () {
var F2 = 0.5 * (Math.sqrt(3.0) - 1.0),
G2 = (3.0 - Math.sqrt(3.0)) / 6.0,
F3 = 1.0 / 3.0,
G3 = 1.0 / 6.0,
F4 = (Math.sqrt(5.0) - 1.0) / 4.0,
G4 = (5.0 - Math.sqrt(5.0)) / 20.0;
function SimplexNoise(random) {
if (!random) random = Math.random;
this.p = new Uint8Array(256);
this.perm = new Uint8Array(512);
this.permMod12 = new Uint8Array(512);
for (var i = 0; i < 256; i++) {
this.p[i] = random() * 256;
}
for (i = 0; i < 512; i++) {
this.perm[i] = this.p[i & 255];
this.permMod12[i] = this.perm[i] % 12;
}
}
SimplexNoise.prototype = {
grad3: new Float32Array([1, 1, 0,
- 1, 1, 0,
1, - 1, 0,
- 1, - 1, 0,
1, 0, 1,
- 1, 0, 1,
1, 0, - 1,
- 1, 0, - 1,
0, 1, 1,
0, - 1, 1,
0, 1, - 1,
0, - 1, - 1]),
grad4: new Float32Array([0, 1, 1, 1, 0, 1, 1, - 1, 0, 1, - 1, 1, 0, 1, - 1, - 1,
0, - 1, 1, 1, 0, - 1, 1, - 1, 0, - 1, - 1, 1, 0, - 1, - 1, - 1,
1, 0, 1, 1, 1, 0, 1, - 1, 1, 0, - 1, 1, 1, 0, - 1, - 1,
- 1, 0, 1, 1, - 1, 0, 1, - 1, - 1, 0, - 1, 1, - 1, 0, - 1, - 1,
1, 1, 0, 1, 1, 1, 0, - 1, 1, - 1, 0, 1, 1, - 1, 0, - 1,
- 1, 1, 0, 1, - 1, 1, 0, - 1, - 1, - 1, 0, 1, - 1, - 1, 0, - 1,
1, 1, 1, 0, 1, 1, - 1, 0, 1, - 1, 1, 0, 1, - 1, - 1, 0,
- 1, 1, 1, 0, - 1, 1, - 1, 0, - 1, - 1, 1, 0, - 1, - 1, - 1, 0]),
noise2D: function (xin, yin) {
var permMod12 = this.permMod12,
perm = this.perm,
grad3 = this.grad3;
var n0=0, n1=0, n2=0; // Noise contributions from the three corners
// Skew the input space to determine which simplex cell we're in
var s = (xin + yin) * F2; // Hairy factor for 2D
var i = Math.floor(xin + s);
var j = Math.floor(yin + s);
var t = (i + j) * G2;
var X0 = i - t; // Unskew the cell origin back to (x,y) space
var Y0 = j - t;
var x0 = xin - X0; // The x,y distances from the cell origin
var y0 = yin - Y0;
// For the 2D case, the simplex shape is an equilateral triangle.
// Determine which simplex we are in.
var i1, j1; // Offsets for second (middle) corner of simplex in (i,j) coords
if (x0 > y0) {
i1 = 1;
j1 = 0;
} // lower triangle, XY order: (0,0)->(1,0)->(1,1)
else {
i1 = 0;
j1 = 1;
} // upper triangle, YX order: (0,0)->(0,1)->(1,1)
// A step of (1,0) in (i,j) means a step of (1-c,-c) in (x,y), and
// a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where
// c = (3-sqrt(3))/6
var x1 = x0 - i1 + G2; // Offsets for middle corner in (x,y) unskewed coords
var y1 = y0 - j1 + G2;
var x2 = x0 - 1.0 + 2.0 * G2; // Offsets for last corner in (x,y) unskewed coords
var y2 = y0 - 1.0 + 2.0 * G2;
// Work out the hashed gradient indices of the three simplex corners
var ii = i & 255;
var jj = j & 255;
// Calculate the contribution from the three corners
var t0 = 0.5 - x0 * x0 - y0 * y0;
if (t0 >= 0) {
var gi0 = permMod12[ii + perm[jj]] * 3;
t0 *= t0;
n0 = t0 * t0 * (grad3[gi0] * x0 + grad3[gi0 + 1] * y0); // (x,y) of grad3 used for 2D gradient
}
var t1 = 0.5 - x1 * x1 - y1 * y1;
if (t1 >= 0) {
var gi1 = permMod12[ii + i1 + perm[jj + j1]] * 3;
t1 *= t1;
n1 = t1 * t1 * (grad3[gi1] * x1 + grad3[gi1 + 1] * y1);
}
var t2 = 0.5 - x2 * x2 - y2 * y2;
if (t2 >= 0) {
var gi2 = permMod12[ii + 1 + perm[jj + 1]] * 3;
t2 *= t2;
n2 = t2 * t2 * (grad3[gi2] * x2 + grad3[gi2 + 1] * y2);
}
// Add contributions from each corner to get the final noise value.
// The result is scaled to return values in the interval [-1,1].
return 70.0 * (n0 + n1 + n2);
},
// 3D simplex noise
noise3D: function (xin, yin, zin) {
var permMod12 = this.permMod12,
perm = this.perm,
grad3 = this.grad3;
var n0, n1, n2, n3; // Noise contributions from the four corners
// Skew the input space to determine which simplex cell we're in
var s = (xin + yin + zin) * F3; // Very nice and simple skew factor for 3D
var i = Math.floor(xin + s);
var j = Math.floor(yin + s);
var k = Math.floor(zin + s);
var t = (i + j + k) * G3;
var X0 = i - t; // Unskew the cell origin back to (x,y,z) space
var Y0 = j - t;
var Z0 = k - t;
var x0 = xin - X0; // The x,y,z distances from the cell origin
var y0 = yin - Y0;
var z0 = zin - Z0;
// For the 3D case, the simplex shape is a slightly irregular tetrahedron.
// Determine which simplex we are in.
var i1, j1, k1; // Offsets for second corner of simplex in (i,j,k) coords
var i2, j2, k2; // Offsets for third corner of simplex in (i,j,k) coords
if (x0 >= y0) {
if (y0 >= z0) {
i1 = 1;
j1 = 0;
k1 = 0;
i2 = 1;
j2 = 1;
k2 = 0;
} // X Y Z order
else if (x0 >= z0) {
i1 = 1;
j1 = 0;
k1 = 0;
i2 = 1;
j2 = 0;
k2 = 1;
} // X Z Y order
else {
i1 = 0;
j1 = 0;
k1 = 1;
i2 = 1;
j2 = 0;
k2 = 1;
} // Z X Y order
}
else { // x0<y0
if (y0 < z0) {
i1 = 0;
j1 = 0;
k1 = 1;
i2 = 0;
j2 = 1;
k2 = 1;
} // Z Y X order
else if (x0 < z0) {
i1 = 0;
j1 = 1;
k1 = 0;
i2 = 0;
j2 = 1;
k2 = 1;
} // Y Z X order
else {
i1 = 0;
j1 = 1;
k1 = 0;
i2 = 1;
j2 = 1;
k2 = 0;
} // Y X Z order
}
// A step of (1,0,0) in (i,j,k) means a step of (1-c,-c,-c) in (x,y,z),
// a step of (0,1,0) in (i,j,k) means a step of (-c,1-c,-c) in (x,y,z), and
// a step of (0,0,1) in (i,j,k) means a step of (-c,-c,1-c) in (x,y,z), where
// c = 1/6.
var x1 = x0 - i1 + G3; // Offsets for second corner in (x,y,z) coords
var y1 = y0 - j1 + G3;
var z1 = z0 - k1 + G3;
var x2 = x0 - i2 + 2.0 * G3; // Offsets for third corner in (x,y,z) coords
var y2 = y0 - j2 + 2.0 * G3;
var z2 = z0 - k2 + 2.0 * G3;
var x3 = x0 - 1.0 + 3.0 * G3; // Offsets for last corner in (x,y,z) coords
var y3 = y0 - 1.0 + 3.0 * G3;
var z3 = z0 - 1.0 + 3.0 * G3;
// Work out the hashed gradient indices of the four simplex corners
var ii = i & 255;
var jj = j & 255;
var kk = k & 255;
// Calculate the contribution from the four corners
var t0 = 0.6 - x0 * x0 - y0 * y0 - z0 * z0;
if (t0 < 0) n0 = 0.0;
else {
var gi0 = permMod12[ii + perm[jj + perm[kk]]] * 3;
t0 *= t0;
n0 = t0 * t0 * (grad3[gi0] * x0 + grad3[gi0 + 1] * y0 + grad3[gi0 + 2] * z0);
}
var t1 = 0.6 - x1 * x1 - y1 * y1 - z1 * z1;
if (t1 < 0) n1 = 0.0;
else {
var gi1 = permMod12[ii + i1 + perm[jj + j1 + perm[kk + k1]]] * 3;
t1 *= t1;
n1 = t1 * t1 * (grad3[gi1] * x1 + grad3[gi1 + 1] * y1 + grad3[gi1 + 2] * z1);
}
var t2 = 0.6 - x2 * x2 - y2 * y2 - z2 * z2;
if (t2 < 0) n2 = 0.0;
else {
var gi2 = permMod12[ii + i2 + perm[jj + j2 + perm[kk + k2]]] * 3;
t2 *= t2;
n2 = t2 * t2 * (grad3[gi2] * x2 + grad3[gi2 + 1] * y2 + grad3[gi2 + 2] * z2);
}
var t3 = 0.6 - x3 * x3 - y3 * y3 - z3 * z3;
if (t3 < 0) n3 = 0.0;
else {
var gi3 = permMod12[ii + 1 + perm[jj + 1 + perm[kk + 1]]] * 3;
t3 *= t3;
n3 = t3 * t3 * (grad3[gi3] * x3 + grad3[gi3 + 1] * y3 + grad3[gi3 + 2] * z3);
}
// Add contributions from each corner to get the final noise value.
// The result is scaled to stay just inside [-1,1]
return 32.0 * (n0 + n1 + n2 + n3);
},
// 4D simplex noise, better simplex rank ordering method 2012-03-09
noise4D: function (x, y, z, w) {
var permMod12 = this.permMod12,
perm = this.perm,
grad4 = this.grad4;
var n0, n1, n2, n3, n4; // Noise contributions from the five corners
// Skew the (x,y,z,w) space to determine which cell of 24 simplices we're in
var s = (x + y + z + w) * F4; // Factor for 4D skewing
var i = Math.floor(x + s);
var j = Math.floor(y + s);
var k = Math.floor(z + s);
var l = Math.floor(w + s);
var t = (i + j + k + l) * G4; // Factor for 4D unskewing
var X0 = i - t; // Unskew the cell origin back to (x,y,z,w) space
var Y0 = j - t;
var Z0 = k - t;
var W0 = l - t;
var x0 = x - X0; // The x,y,z,w distances from the cell origin
var y0 = y - Y0;
var z0 = z - Z0;
var w0 = w - W0;
// For the 4D case, the simplex is a 4D shape I won't even try to describe.
// To find out which of the 24 possible simplices we're in, we need to
// determine the magnitude ordering of x0, y0, z0 and w0.
// Six pair-wise comparisons are performed between each possible pair
// of the four coordinates, and the results are used to rank the numbers.
var rankx = 0;
var ranky = 0;
var rankz = 0;
var rankw = 0;
if (x0 > y0) rankx++;
else ranky++;
if (x0 > z0) rankx++;
else rankz++;
if (x0 > w0) rankx++;
else rankw++;
if (y0 > z0) ranky++;
else rankz++;
if (y0 > w0) ranky++;
else rankw++;
if (z0 > w0) rankz++;
else rankw++;
var i1, j1, k1, l1; // The integer offsets for the second simplex corner
var i2, j2, k2, l2; // The integer offsets for the third simplex corner
var i3, j3, k3, l3; // The integer offsets for the fourth simplex corner
// simplex[c] is a 4-vector with the numbers 0, 1, 2 and 3 in some order.
// Many values of c will never occur, since e.g. x>y>z>w makes x<z, y<w and x<w
// impossible. Only the 24 indices which have non-zero entries make any sense.
// We use a thresholding to set the coordinates in turn from the largest magnitude.
// Rank 3 denotes the largest coordinate.
i1 = rankx >= 3 ? 1 : 0;
j1 = ranky >= 3 ? 1 : 0;
k1 = rankz >= 3 ? 1 : 0;
l1 = rankw >= 3 ? 1 : 0;
// Rank 2 denotes the second largest coordinate.
i2 = rankx >= 2 ? 1 : 0;
j2 = ranky >= 2 ? 1 : 0;
k2 = rankz >= 2 ? 1 : 0;
l2 = rankw >= 2 ? 1 : 0;
// Rank 1 denotes the second smallest coordinate.
i3 = rankx >= 1 ? 1 : 0;
j3 = ranky >= 1 ? 1 : 0;
k3 = rankz >= 1 ? 1 : 0;
l3 = rankw >= 1 ? 1 : 0;
// The fifth corner has all coordinate offsets = 1, so no need to compute that.
var x1 = x0 - i1 + G4; // Offsets for second corner in (x,y,z,w) coords
var y1 = y0 - j1 + G4;
var z1 = z0 - k1 + G4;
var w1 = w0 - l1 + G4;
var x2 = x0 - i2 + 2.0 * G4; // Offsets for third corner in (x,y,z,w) coords
var y2 = y0 - j2 + 2.0 * G4;
var z2 = z0 - k2 + 2.0 * G4;
var w2 = w0 - l2 + 2.0 * G4;
var x3 = x0 - i3 + 3.0 * G4; // Offsets for fourth corner in (x,y,z,w) coords
var y3 = y0 - j3 + 3.0 * G4;
var z3 = z0 - k3 + 3.0 * G4;
var w3 = w0 - l3 + 3.0 * G4;
var x4 = x0 - 1.0 + 4.0 * G4; // Offsets for last corner in (x,y,z,w) coords
var y4 = y0 - 1.0 + 4.0 * G4;
var z4 = z0 - 1.0 + 4.0 * G4;
var w4 = w0 - 1.0 + 4.0 * G4;
// Work out the hashed gradient indices of the five simplex corners
var ii = i & 255;
var jj = j & 255;
var kk = k & 255;
var ll = l & 255;
// Calculate the contribution from the five corners
var t0 = 0.6 - x0 * x0 - y0 * y0 - z0 * z0 - w0 * w0;
if (t0 < 0) n0 = 0.0;
else {
var gi0 = (perm[ii + perm[jj + perm[kk + perm[ll]]]] % 32) * 4;
t0 *= t0;
n0 = t0 * t0 * (grad4[gi0] * x0 + grad4[gi0 + 1] * y0 + grad4[gi0 + 2] * z0 + grad4[gi0 + 3] * w0);
}
var t1 = 0.6 - x1 * x1 - y1 * y1 - z1 * z1 - w1 * w1;
if (t1 < 0) n1 = 0.0;
else {
var gi1 = (perm[ii + i1 + perm[jj + j1 + perm[kk + k1 + perm[ll + l1]]]] % 32) * 4;
t1 *= t1;
n1 = t1 * t1 * (grad4[gi1] * x1 + grad4[gi1 + 1] * y1 + grad4[gi1 + 2] * z1 + grad4[gi1 + 3] * w1);
}
var t2 = 0.6 - x2 * x2 - y2 * y2 - z2 * z2 - w2 * w2;
if (t2 < 0) n2 = 0.0;
else {
var gi2 = (perm[ii + i2 + perm[jj + j2 + perm[kk + k2 + perm[ll + l2]]]] % 32) * 4;
t2 *= t2;
n2 = t2 * t2 * (grad4[gi2] * x2 + grad4[gi2 + 1] * y2 + grad4[gi2 + 2] * z2 + grad4[gi2 + 3] * w2);
}
var t3 = 0.6 - x3 * x3 - y3 * y3 - z3 * z3 - w3 * w3;
if (t3 < 0) n3 = 0.0;
else {
var gi3 = (perm[ii + i3 + perm[jj + j3 + perm[kk + k3 + perm[ll + l3]]]] % 32) * 4;
t3 *= t3;
n3 = t3 * t3 * (grad4[gi3] * x3 + grad4[gi3 + 1] * y3 + grad4[gi3 + 2] * z3 + grad4[gi3 + 3] * w3);
}
var t4 = 0.6 - x4 * x4 - y4 * y4 - z4 * z4 - w4 * w4;
if (t4 < 0) n4 = 0.0;
else {
var gi4 = (perm[ii + 1 + perm[jj + 1 + perm[kk + 1 + perm[ll + 1]]]] % 32) * 4;
t4 *= t4;
n4 = t4 * t4 * (grad4[gi4] * x4 + grad4[gi4 + 1] * y4 + grad4[gi4 + 2] * z4 + grad4[gi4 + 3] * w4);
}
// Sum up and scale the result to cover the range [-1,1]
return 27.0 * (n0 + n1 + n2 + n3 + n4);
}
};
// amd
if (typeof define !== 'undefined' && define.amd) define(function(){return SimplexNoise;});
//common js
if (typeof exports !== 'undefined') exports.SimplexNoise = SimplexNoise;
// browser
else if (typeof navigator !== 'undefined') this.SimplexNoise = SimplexNoise;
// nodejs
if (typeof module !== 'undefined') {
module.exports = SimplexNoise;
}
})();
</script>
</body>
</html>
一起來看效果！！！
