鼠标移动烟花

时间：2017-01-05 11:47:32 阅读：289 评论：0 收藏：0 [点我收藏+]

标签：前端 app arc [] index screen rect fill over

<!DOCTYPE html><html class=‘‘>

background: #333;

padding: 0;

margin: 0;

width: 100%;

height: 100%;

overflow: hidden;

}

.datgui {

position: absolute;

top: 0;

z-index: 100;

right: 0;

opacity: 0.3;

transition: opacity 700ms ease-out;

}

.datgui:hover {

opacity: 1;

}

</style></head><body>

var _class2, _temp, _initialiseProps;

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

// Blob Class

// Generic Particle class for both grow and explode

var Blob = function Blob(config) {

var _this = this;

_classCallCheck(this, Blob);

this.update = function () {

_this.x += _this.vx;

_this.y += _this.vy;

if (_this.diretion === ‘up‘ && _this.size.start > _this.size.end - 1 || _this.diretion === ‘down‘ && _this.size.start < _this.size.end + 1) {

_this.died = true;

}

_this.size.start = _this.size.start - (_this.size.start - _this.size.end) * 0.1;

};

this.x = config.x;

this.y = config.y;

this.vx = config.vx;

this.vy = config.vy;

this.origin = {

x: config.origin.x,

y: config.origin.y

};

this.size = {

start: config.size.start,

end: config.size.end

};

this.diretion = this.size.start < this.size.end ? ‘up‘ : ‘down‘;

this.operation = config.operation;

this.died = config.died;

this.color = config.color;

};

// Render Class //

var Render = (_temp = _class2 = function () {

function Render(element) {

_classCallCheck(this, Render);

_initialiseProps.call(this);

this.element = element;

this.operation = ‘xor‘;

this.canvas = this.createCanvas(‘canvas‘);

this.points = [];

this.tick = 0;

this.ops = ~ ~(Math.random() * (this.operation.length - 1));

window.addEventListener(‘resize‘, this.resetCanvas);

window.addEventListener(‘mousemove‘, this.createPoint);

this.renderLoop();

}

// Set Options from GUI

Render.prototype.drawLine = function drawLine(point1, point2) {

this.surface.beginPath();

this.surface.strokeStyle = point1.color;

this.surface.lineWidth = 0.1;

this.surface.moveTo(point1.x, point1.y);

this.surface.lineTo(point2.x, point2.y);

this.surface.stroke();

};

return Render;

}(), _initialiseProps = function _initialiseProps() {

var _this2 = this;

this.setOptions = function (options) {

_this2.operation = options.operation;

_this2.baseHue = options.baseHue;

_this2.baseSize = options.baseSize;

_this2.baseSpeed = options.baseSpeed;

_this2.drawBlobs = options.drawBlobs;

_this2.drawLines = options.drawLines;

_this2.motion = options.motion;

_this2.speed = options.speed;

};

this.setViewport = function (element) {

var canvasElement = element;

var width = ~ ~(document.documentElement.clientWidth, window.innerWidth || 0);

var height = ~ ~(document.documentElement.clientHeight, window.innerHeight || 0);

_this2.width = width;

_this2.height = height;

canvasElement.width = _this2.width;

canvasElement.height = _this2.height;

};

this.createCanvas = function (name) {

var canvasElement = document.createElement(‘canvas‘);

canvasElement.id = name;

_this2.setViewport(canvasElement);

_this2.element.appendChild(canvasElement);

_this2.surface = canvasElement.getContext(‘2d‘);

_this2.surface.scale(1, 1);

return canvasElement;

};

this.resetCanvas = function () {

window.cancelAnimationFrame(_this2.animation);

_this2.setViewport(_this2.canvas);

_this2.renderLoop();

};

this.createPoint = function (event, demo) {

_this2.tick++;

if (_this2.tick > 2) {

_this2.tick = 0;

var x = event ? event.pageX : _this2.width / 2;

var y = event ? event.pageY : _this2.height / 2;

var end = _this2.baseSize + ~ ~(Math.random() * 30);

var start = demo ? end / 1.1 : 0;

var origin = {

x: x,

y: y

};

var point = new Blob({

x: x,

y: y,

vx: Math.random() * _this2.baseSpeed - _this2.baseSpeed / 2,

vy: Math.random() * _this2.baseSpeed - _this2.baseSpeed / 2,

origin: origin,

size: {

start: start,

end: end

died: false,

color: ‘hsl(‘ + (_this2.baseHue + ~ ~(Math.random() * 60)) + ‘, 100%, 50%)‘

});

_this2.points.push(point);

}

};

this.createPop = function (config) {

var angle = Math.random() * 2 * Math.PI;

var radius = Math.random() * config.size.start * config.size.start;

var pointX = config.x + Math.sqrt(radius) * Math.cos(angle);

var pointY = config.y + Math.sqrt(radius) * Math.sin(angle);

var point = new Blob({

x: pointX,

y: pointY,

vx: (pointX - config.x) * 0.1 + config.vx,

vy: (pointY - config.y) * 0.1 + config.vy,

origin: {

x: config.x,

y: config.y

size: {

start: config.size.start / 2,

end: 0

died: false,

color: config.color

});

_this2.points.push(point);

};

this.draw = function (point) {

_this2.surface.beginPath();

_this2.surface.fillStyle = point.color;

_this2.surface.arc(point.x, point.y, point.size.start, 0, 2 * Math.PI, false);

_this2.surface.fill();

};

this.renderLoop = function () {

_this2.surface.globalCompositeOperation = _this2.operation;

if (_this2.motion) {

_this2.surface.drawImage(_this2.canvas, 0, -_this2.speed);

}

_this2.surface.fillStyle = ‘rgba(0,0,0,0.08)‘;

_this2.surface.fillRect(0, 0, _this2.width, _this2.height);

for (var x = 0; x < _this2.points.length; x++) {

var point = _this2.points[x];

if (_this2.drawBlobs) {

_this2.draw(point);

}

point.update();

if (x < _this2.points.length - 1 && _this2.drawLines) {

_this2.drawLine(point, point.origin);

}

if (point.died) {

if (point.diretion === ‘up‘) {

_this2.points.splice(x, 1);

var amt = ~ ~(Math.random() * 10) + 10;

for (var i = 0; i < amt; i++) {

_this2.createPop(point);

}

} else {

_this2.points.splice(x, 1);

}

_this2.animation = window.requestAnimationFrame(_this2.renderLoop);

};

}, _temp);

// GUI Functions and Options

var assignOptions = function assignOptions() {

demo.setOptions(options);

};

var options = {

baseHue: 40,

baseSize: 10,

baseSpeed: 5,

operation: ‘source-over‘,

drawBlobs: true,

drawLines: false,

motion: false,

speed: 3

};

var demo = new Render(document.body);

assignOptions();

var event = {

pageX: ~ ~(document.documentElement.clientWidth, window.innerWidth || 0) / 2,

pageY: ~ ~(document.documentElement.clientHeight, window.innerHeight || 0) / 2

};

for (var i = 0; i < 10; i++) {

demo.createPoint(event, {

start: true

});

}

// GUI Folders

var gui = new dat.GUI();

var folderParticle = gui.addFolder(‘Particle Options‘);

var folderRender = gui.addFolder(‘Render Options‘);

var folderMotion = gui.addFolder(‘Add Motion‘);

folderParticle.add(options, ‘baseSize‘, 1, 50).step(1).onFinishChange(assignOptions);

folderRender.add(options, ‘baseHue‘, 1, 360).step(1).onFinishChange(assignOptions);

folderParticle.add(options, ‘baseSpeed‘, 1, 20).step(1).onFinishChange(assignOptions);

folderRender.add(options, ‘drawBlobs‘).onFinishChange(assignOptions);

folderRender.add(options, ‘drawLines‘).onFinishChange(assignOptions);

folderRender.add(options, ‘operation‘, [‘xor‘, ‘lighter‘, ‘screen‘, ‘overlay‘, ‘difference‘, ‘exclusion‘, ‘source-over‘, ‘none‘]).onFinishChange(assignOptions);

folderMotion.add(options, ‘motion‘).onFinishChange(assignOptions);

folderMotion.add(options, ‘speed‘, 1, 10).step(1).onFinishChange(assignOptions);

folderParticle.open();

document.querySelector(‘.datgui‘).appendChild(gui.domElement);

//# sourceURL=pen.js

</script>

</body></html>

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鼠标移动烟花

标签：前端 app arc [] index screen rect fill over

原文地址：http://www.cnblogs.com/ZZZAB/p/6251603.html

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