js实现动感线条曲线动画效果代码
代码语言：html
所属分类：动画
代码描述：js实现动感线条曲线动画效果代码
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
canvas.drawer {
position:fixed;
top:0px;
left:0px;
width:100vw;
height:100vh;
}
</style>
</head>
<body>
<div></div>
<script>
'use strict';
var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
var initialise = function initialise() {
var application = new Application();
// application.scaleFactor = 2;
application.clearOnRedraw = Application.FADE;
application.fadeColour = 'rgba(0,0,0,.03)';
application.fillColour = 'rgba(30,30,30,1)';
application.onResize();
var vfield = new VectorField();
vfield.scale = 300;
vfield.amplitude = 40;
// vfield.debug = true;
application.addActor(vfield);
var maxNum = 1000;
var num = 0;
var addTracer = function addTracer(position, colour) {
if (num > maxNum) return;
num++;
var tracer = new BranchTracer(position.x, position.y);
tracer.field = vfield;
var momentum = new Vector(Math.random(), Math.random());
momentum.length = Math.random() * 2;
tracer.momentum = momentum;
tracer.friction = 0.97;
if (colour) {
tracer.colour = colour;
} else {
tracer.colour = 'RGBA(' + Math.round(Math.random() * 255) + ',' + 100 + Math.round(Math.random() * 155) + ',255,0.2)';
}
application.addActor(tracer);
return tracer;
};
var seed = addTracer(new Vector(window.innerWidth / 2, window.innerHeight / 2), 'RGBA(255, 100, 100, 0.8)');
seed.branchChance = 5;
seed.friction = 0.985;
seed.onBranch = addTracer;
setInterval(function () {
vfield.z = Math.random() * 10000;
}, 10000);
var stage = application.stage;
document.body.appendChild(stage);
application.onPointerMove({ clientX: window.innerWidth / 2, clientY: window.innerHeight / 2 });
application.render();
application.animating = true;
// application.runFor(60 * 120);
return;
};
var Application = function () {
function Application() {
_classCallCheck(this, Application);
this.stage = document.createElement('canvas');
this.animate = this.animate.bind(this);
this.onResize = this.onResize.bind(this);
this.onPointerDown = this.onPointerDown.bind(this);
this.onPointerup = this.onPointerup.bind(this);
this.onPointerMove = this.onPointerMove.bind(this);
this.initialiseEvents();
}
Application.prototype.initialiseEvents = function initialiseEvents() {
window.addEventListener('resize', this.onResize, false);
document.addEventListener('pointerdown', this.onPointerDown, false);
document.addEventListener('pointerup', this.onPointerup, false);
document.addEventListener('pointermove', this.onPointerMove, false);
};
Application.prototype.deInitialiseEvents = function deInitialiseEvents() {
window.removeEventListener('resize', this.onResize, false);
document.removeEventListener('pointerdown', this.onPointerDown, false);
document.removeEventListener('pointerup', this.onPointerup, false);
document.removeEventListener('pointermove', this.onPointerMove, false);
};
Application.prototype.addActor = function addActor(actor) {
if (actor instanceof Actor) {
this.actors.push(actor);
}
};
Application.prototype.runFor = function runFor(ticks) {
var interval = 1 / 60;
var i = 0;
for (i; i < ticks; i++) {
this.triggerEvent('application-animate', { now: this.now, then: this.then, interval: interval, application: this });
this.render();
}
};
Application.prototype.animate = function animate() {
this.now = Date.now();
var interval = this.now - this.then;
this.triggerEvent('application-animate', { now: this.now, then: this.then, interval: interval, application: this });
this.render();
this.then = this.now;
if (this.animating) {
requestAnimationFrame(this.animate);
}
};
Application.prototype.render = function render() {
var _this = this;
var dims = this.dimensions;
if (this.clearOnRedraw == Application.CLEAR) {
this.context.clearRect(0, 0, dims.width, dims.height);
} else if (this.clearOnRedraw == Application.FADE) {
this.context.fillStyle = this.fadeColour;
this.context.fillRect(0, 0, dims.width, dims.height);
}
this.actors.forEach(function (actor) {
actor.render(_this);
});
};
Application.prototype.onResize = function onResize(e) {
console.log('resize');
this.dimensions = new Vector(window.innerWidth, window.innerHeight);
};
Application.prototype.onPointerDown = function onPointerDown(e) {};
Application.prototype.onPointerup = function onPointerup(e) {};
Application.prototype.onPointerMove = function onPointerMove(e) {
var pointer = new Vector(e.clientX, e.clientY);
this.triggerEvent('application-pointermove', { pointer: pointer });
};
Application.prototype.triggerEvent = function triggerEvent(event, data) {
if (window.CustomEvent) {
var event = new CustomEvent(event, { detail: data });
} else {
var event = document.createEvent('CustomEvent');
event.initCustomEvent(event, true, true, data);
}
document.dispatchEvent(event);
};
_createClass(Application, [{
key: 'actors',
get: function get() {
if (!this._actors) this._actors = [];
return this._actors;
}
}, {
key: 'scaleFactor',
set: function set(value) {
if (value >= 1) {
this._scaleFactor = value;
this.onResize();
}
},
get: function get() {
return this._scaleFactor || 1;
}
}, {
key: 'dimensions',
set: function set(value) {
if (value instanceof Vector) {
value.scale(this.scaleFactor);
this.stage.width = value.width;
this.stage.height = value.height;
this.context.fillStyle = this.fillColour;
this.context.fillRect(0, 0, this.dimensions.width, this.dimensions.height);
this._dimensions = value;
}
},
get: function get() {
return this._dimensions || new Vector(0, 0);
}
}, {
key: 'stage',
set: function set(value) {
if (value instanceof HTMLCanvasElement) {
value.className = this.className;
this._stage = value;
this.context = this.stage.getContext('2d');
this.context.fillStyle = this.fillColour;
this.context.fillRect(0, 0, this.dimensions.width, this.dimensions.height);
this.onResize();
}
},
get: function get() {
return this._stage || null;
}
}, {
key: 'now',
set: function set(value) {
if (!isNaN(value)) this._now = value;
},
get: function get() {
return this._now || 0;
}
}, {
key: 'then',
set: function set(value) {
if (!isNaN(value)) this._then = value;
},
get: function get() {
return this._then || 0;
}
}, {
key: 'animating',
set: function set(value) {
if (value === true && this.animating !== true) {
this._animating = true;
this.now = Date.now();
this.then = this.now;
requestAnimationFrame(this.animate);
}
},
get: function get() {
return this._animating === true;
}
}, {
key: 'fadeColour',
set: function set(value) {
this._fadeColour = value;
},
get: function get() {
return this._fadeColour || 'rgba(255,255,255,.5)';
}
}, {
key: 'fillColour',
set: function set(value) {
this._fillColour = value;
},
get: function get() {
return this._fillColour || 'rgba(255,255,255,1)';
}
}, {
key: 'clearOnRedraw',
set: function set(value) {
if ([Application.NOCLEAR, Application.CLEAR, Application.FADE].indexOf(value) > -1) {
this._clearOnRedraw = value;
}
},
get: function get() {
return this._clearOnRedraw || Application.NOCLEAR;
}
}, {
key: 'className',
get: function get() {
return 'drawer';
}
}]);
return Application;
}();
Application.NOCLEAR = 0;
Application.CLEAR = 1;
Application.FADE = 2;
var Actor = function () {
function Actor(x, y, w, h) {
_classCallCheck(this, Actor);
this.dimensions = new Vector(w, h);
this.position = new Vector(x, y);
}
Actor.prototype.render = function render() {};
_createClass(Actor, [{
key: 'dimensions',
set: function set(value) {
if (value instanceof Vector) this._dimensions = value;
},
get: function get() {
return this._dimensions || new Vector(0, 0);
}
}, {
key: 'position',
set: function set(value) {
if (value instanceof Vector) this._position = value;
},
get: function get() {
return this._position || new Vector(0, 0);
}
}]);
return Actor;
}();
var VectorField = function (_Actor) {
_inherits(VectorField, _Actor);
function VectorField() {
var x = arguments.length <= 0 || arguments[0] === undefined ? 0 : arguments[0];
var y = arguments.length <= 1 || arguments[1] === undefined ? 0 : arguments[1];
var w = arguments.length <= 2 || arguments[2] === undefined ? 0 : arguments[2];
var h = arguments.length <= 3 || arguments[3] === undefined ? 0 : arguments[3];
_classCallCheck(this, VectorField);
var _this2 = _possibleConstructorReturn(this, _Actor.call(this, x, y, w, h));
_this2.noise = new Noise();
_this2.helpers = [];
_this2.mousepos = new Vector(0, 0);
_this2.onResize = _this2.onResize.bind(_this2);
_this2.onPointerMove = _this2.onPointerMove.bind(_this2);
// document.addEventListener('application-pointermove', this.onPointerMove, false);
window.addEventListener('resize', _this2.onResize);
_this2.onResize();
return _this2;
}
VectorField.prototype.render = function render(application) {
this.helpers.forEach(function (helper) {
helper.render(application);
});
};
VectorField.prototype.preDraw = function preDraw() {};
VectorField.prototype.postDraw = function postDraw() {};
VectorField.prototype.solveForPosition = function solveForPosition(v) {
if (!v instanceof Vector) return;
v = v.clone();
v.x -= window.innerWidth / 2;
v.y -= window.innerHeight / 2;
var scale = this.scale;
var amp = this.amplitude;
// let waveform = new Vector(Math.cos(v.x / scale) * amp, Math.sin(v.y / scale) * amp);
// return new Vector(waveform.y - waveform.x, -waveform.x - waveform.y);
var envelope = this.amplitude;
var noise = this.noise.noise(v.x / scale, v.y / scale, this.z) * scale;
if (noise > envelope) noise = envelope;
if (noise < -envelope) noise = -envelope;
var noise1 = this.noise.noise(v.y / scale, v.x / scale, this.z / scale);
var transV = new Vector(1, 0);
transV.length = noise;
transV.angle = noise1 * 10;
return transV;
var transv = v.subtractNew(this.mousepos);
transv = new Vector(transv.y - transv.x, -transv.x - transv.y);
transv.length *= 0.03;
if (transv.length > 50) {
transv.length = 50;
}
transv.length -= 50;
transv.length *= -1;
return transv;
};
VectorField.prototype.onPointerMove = function onPointerMove(e) {
var _this3 = this;
this.mousepos = e.detail.pointer;
this.helpers.forEach(function (helper) {
helper.vector = _this3.solveForPosition(helper.position);
});
};
VectorField.prototype.onResize = function onResize(e) {
if (!this.debug) return;
this.helpers.forEach(function (helper) {
helper.destroy();
});
this.helpers = [];
var w = this.sampleWidth;
var curpos = new Vector(0, 0);
while (curpos.y < window.innerHeight + w) {
curpos.x = 0;
while (curpos.x < window.innerWidth + w) {
this.helpers.push(new Arrow(curpos.x, curpos.y, 10, 10, this.solveForPosition(curpos)));
curpos.x += w;
}
curpos.y += w;
}
};
_createClass(VectorField, [{
key: 'scale',
set: function set(value) {
if (value > 0) {
this._scale = value;
}
},
get: function get() {
return this._scale || 500;
}
}, {
key: 'amplitude',
set: function set(value) {
if (value > 0) {
this._amplitude = value;
}
},
get: function get() {
return this._amplitude || 10;
}
}, {
key: 'sampleWidth',
set: function set(value) {
if (value > 0) this._sampleWidth = value;
},
get: function get() {
return this._sampleWidth || 30;
}
}, {
key: 'z',
set: function set(value) {
if (value > 0) this._z = value;
},
get: function get() {
return this._z || 30;
}
}, {
key: 'mousepos',
set: function set(value) {
if (value instanceof Vector) this._mousepos = value;
},
get: function get() {
return this._mousepos || new Vector(0, 0);
}
}, {
key: 'debug',
set: function set(value) {
this._debug = value === true;
},
get: function get() {
return this._debug === true;
}
}, {
key: 'strokeStyle',
get: function get() {
return 'black';
}
}, {
key: 'strokeWidth',
get: function get() {
return 0;
}
}]);
return VectorField;
}(Actor);
var Tracer = function (_Actor2) {
_inherits(Tracer, _Actor2);
function Tracer() {
var x = arguments.length <= 0 || arguments[0] === undefined ? 200 : arguments[0];
var y = arguments.length <= 1 || arguments[1] === undefined ? 200 : arguments[1];
var w = arguments.length <= 2 || arguments[2] === undefined ? 40 : arguments[2];
var h = arguments.length <= 3 || arguments[3] === undefined ? 20 : arguments[3];
_classCallCheck(this, Tracer);
var _this4 = _possibleConstructorReturn(this, _Actor2.call(this, x, y, w, h));
_this4.onAnimate = _this4.onAnimate.bind(_this4);
document.addEventListener('application-animate', _this4.onAnimate, false);
_this4.friction = 0.99;
_this4.momentum = new Vector(1, 0);
return _this4;
}
Tracer.prototype.onAnimate = function onAnimate(e) {
var force = this.field.solveForPosition(this.position).multiplyScalar(0.01);
var app = e.detail.application;
var oldPosition = this.position.clone();
var draw = true;
this.momentum.add(force);
this.momentum.multiplyScalar(this.friction);
if (this.momentum.length < 1) this.momentum.length = 1;
if (this.momentum.length > 20) this.momentum.length = 20;
this.position.add(this.momentum);
if (this.position.x < -this.dimensions.width) {
this.position.x = app.dimensions.width + this.dimensions.width;
draw = false;
} else if (this.position.x > app.dimensions.width + this.dimensions.width) {
this.position.x = -this.dimensions.width;
draw = false;
}
if (this.position.y < -this.dimensions.height) {
this.position.y = app.dimensions.height + this.dimensions.height;
draw = false;
} else if (this.position.y > app.dimensions.height + this.dimensions.height) {
this.position.y = -this.dimensions.height;
draw = false;
}
if (draw) {
var context = app.context;
var opacity = Math.abs((this.momentum.length - 10) / 20);
// console.log(opacity, this.momentum.length);
// console.log(oldPosition, this.position);
context.beginPath();
context.lineWidth = this.momentum.length / 2;
context.strokeStyle = this.colour;
context.moveTo(oldPosition.x, oldPosition.y);
context.lineTo(this.position.x, this.position.y);
context.stroke();
}
};
_createClass(Tracer, [{
key: 'colour',
set: function set(value) {
this._colour = value;
},
get: function get() {
return this._colour || 'RGBA(255,255,255,0.1)';
}
}]);
return Tracer;
}(Actor);
var BranchTracer = function (_Tracer) {
_inherits(BranchTracer, _Tracer);
function BranchTracer() {
_classCallCheck(this, BranchTracer);
return _possibleConstructorReturn(this, _Tracer.apply(this, arguments));
}
BranchTracer.prototype.onAnimate = function onAnimate(e) {
_Tracer.prototype.onAnimate.call(this, e);
if (Math.random() * 100 < this.branchChance) {
this.onBranch(this.position);
}
};
_createClass(BranchTracer, [{
key: 'onBranch',
set: function set(value) {
if (typeof value == 'function') this._onBranch = value.bind(this);
},
get: function get() {
return this._onBranch || function () {};
}
}, {
key: 'branchChance',
set: function set(value) {
if (value > 0 && value <= 100) this._branchChance = value;
},
get: function get() {
return this._branchChance || 0.2;
}
}]);
return BranchTracer;
}(Tracer);
var Noise = function () {
function Noise(r) {
_classCallCheck(this, Noise);
if (r == undefined) r = Math;
this.grad3 = [[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]];
this.p = [];
for (var i = 0; i < 256; i++) {
this.p[i] = Math.floor(r.random() * 256);
}
// To remove the need for index wrapping, double the permutation table length
this.perm = [];
for (var i = 0; i < 512; i++) {
this.perm[i] = this.p[i & 255];
}
}
Noise.prototype.dot = function dot(g, x, y, z) {
return g[0] * x + g[1] * y + g[2] * z;
};
Noise.prototype.mix = function mix(a, b, t) {
return (1.0 - t) * a + t * b;
};
Noise.prototype.fade = function fade(t) {
return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);
};
Noise.prototype.noise = function noise(x, y, z) {
// Find unit grid cell containing point
var X = Math.floor(x);
var Y = Math.floor(y);
var Z = Math.floor(z);
// Get relative xyz coordinates of point within that cell
x = x - X;
y = y - Y;
z = z - Z;
// Wrap the integer cells at 255 (smaller integer period can be introduced here)
X = X & 255;
Y = Y & 255;
Z = Z & 255;
// Calculate a set of eight hashed gradient indices
var gi000 = this.perm[X + this.perm[Y + this.perm[Z]]] % 12;
.........完整代码请登录后点击上方下载按钮下载查看
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