Canvas 点焊/火花特效

看起来像是电工在焊接钢管。

Canvas，粒子

《three.js如何实现贴图模糊效果 - 使用canvas》申请公开！

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常用链接

HTML
CSS
JavaScript
Result

编译

JavaScript

// Simmering gold particle test
// Original particle idea from https://github.com/sebleedelisle/live-coding-presentations
var canvas = document.createElement('canvas'),
    ctx = canvas.getContext('2d'),
    screenW = window.innerWidth,
    screenH = window.innerHeight,
    mouseX = screenW / 2,
    mouseY = screenH / 2,
    mouseVelX = 0,
    mouseVelY = 0,
    lastMouseX = mouseX,
    lastMouseY = mouseY,
    mouseDown = false,
    particles = [],
    MAX_PARTICLES = 350,
    particleImage = new Image();

particleImage.src = 'data:image/png;base64,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';

var requestAnimFrame = function() {
    return window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function(callback) {
            window.setTimeout(callback, 1000 / 60);
        };
}();

// Functions
function init() {
    document.body.appendChild(canvas);
    canvas.width = screenW;
    canvas.height = screenH;
    initMouseListeners();
    executeLoop(); // Start
}

function executeLoop() {
    loop();
    requestAnimFrame(executeLoop);
}

function loop() {
    mouseVelX = mouseX - lastMouseX;
    mouseVelY = mouseY - lastMouseY;
    lastMouseX = mouseX;
    lastMouseY = mouseY;
    makeParticle(4);
    ctx.fillStyle = "rgba(0,0,0,0.9)";
    ctx.fillRect(0, 0, screenW, screenH);

for (var i = 0, len = particles.length; i < len; i++) {
        var particle = particles[i];
        // Bottom wall
        if (particle.posY > screenH - 170) {
            particle.velY *= -0.8;
            particle.posY = screenH - 170;
        }
        // Left wall
        if (particle.posX < 0) {
            particle.velX *= -0.8;
            particle.posX = 0;
        }
        // Right wall
        if (particle.posX > screenW) {
            particle.velX *= -0.8;
            particle.posX = screenW;
        }
        particle.update();
        particle.render(ctx);
    }
    while (particles.length > MAX_PARTICLES) {
        particles.shift();
    }
}

function initMouseListeners() {
    document.addEventListener('mousemove', handleMouseMove, false);
    document.addEventListener('touchmove', handleTouchMove, false);
    document.addEventListener('mousedown', handleMouseDown, false);
    document.addEventListener('mouseup', handleMouseUp, false);
}

function handleMouseMove(event) {
    event.preventDefault();
    mouseX = event.clientX;
    mouseY = event.clientY;
}

function handleTouchMove(event) {
    event.preventDefault();
    mouseX = event.changedTouches[0].clientX;
    mouseY = event.changedTouches[0].clientY;
}

function handleMouseDown(event) {
    mouseDown = true;
}

function handleMouseUp(event) {
    mouseDown = false;
}

function randomRange(min, max) {
    return ((Math.random() * (max - min)) + min);
}

// Class ImageParticle
// Copyright (c)2010-2013, Seb Lee-Delisle, seb.ly
// All rights reserved.
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
function ImageParticle(img, posx, posy) {
    this.posX = posx;
    this.posY = posy;
    this.velX = 0;
    this.velY = 0;
    this.shrink = 0.96;
    this.size = 1;
    this.maxSize = -1;
    this.shimmer = true;
    this.drag = 0.98;
    this.gravity = 0.2;
    this.alpha = 1;
    this.fade = 0;
    this.spin = 0;
    this.rotation = 0;
    this.compositeOperation = 'lighter';
    this.img = img;
    this.update = function() {
        this.velX *= this.drag;
        this.velY *= this.drag;
        this.velY += this.gravity;
        this.posX += this.velX;
        this.posY += this.velY;
        this.size *= this.shrink;
        if ((this.maxSize > 0) && (this.size > this.maxSize)) this.size = this.maxSize;
        this.alpha -= this.fade;
        if (this.alpha < 0) this.alpha = 0;
        this.rotation += this.spin;
    };
    this.render = function(c) {
        if (this.alpha === 0) return;
        c.save();
        c.translate(this.posX, this.posY);
        var s = this.shimmer ? this.size * Math.random() : this.size;
        c.scale(s, s);
        c.rotate(this.rotation * Math.PI / 180);
        c.translate(img.width * -0.5, img.width * -0.5);
        c.globalAlpha = this.alpha;
        c.globalCompositeOperation = this.compositeOperation;
        c.drawImage(img, 0, 0);
        c.restore();
    };
}

init();

编译

CSS

html,
body {
    height: 100%;
    background-color: #000;
    overflow: hidden;
}
body,
div {
    margin: 0;
}
.horizon-bg {
    position: relative;
    z-index: 0;
    position: absolute;
    right: 0;
    bottom: 34px;
    left: 0;
    width: 100%;
    height: 130px;
    background-image: -moz-linear-gradient(top, rgba(252, 235, 89, 0.1), #000);
    background-image: -webkit-linear-gradient(top, rgba(252, 235, 89, 0.1), #000);
    background-image: linear-gradient(to bottom, rgba(252, 235, 89, 0.1), #000);
}
.horizon-lines div {
    position: absolute;
    bottom: 164px;
    width: 100%;
    height: 5px;
    background: #fff;
    -moz-animation-duration: 5s;
    -webkit-animation-duration: 5s;
    animation-duration: 5s;
    -moz-animation-name: glow;
    -webkit-animation-name: glow;
    animation-name: glow;
    -moz-animation-timing-function: cubic-bezier(0.06, 0.22, 0.19, 0.99);
    -webkit-animation-timing-function: cubic-bezier(0.06, 0.22, 0.19, 0.99);
    animation-timing-function: cubic-bezier(0.06, 0.22, 0.19, 0.99);
    -moz-animation-iteration-count: infinite;
    -webkit-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    box-shadow: 0 0 3px #fceb59, 0 0 6px #fceb59;
    filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
}
.horizon-lines div:nth-child(1) {
    -moz-animation-delay: 1s;
    -webkit-animation-delay: 1s;
    animation-delay: 1s;
}
.horizon-lines div:nth-child(2) {
    -moz-animation-delay: 2s;
    -webkit-animation-delay: 2s;
    animation-delay: 2s;
}
.horizon-lines div:nth-child(3) {
    -moz-animation-delay: 3s;
    -webkit-animation-delay: 3s;
    animation-delay: 3s;
}
.horizon-lines div:nth-child(4) {
    -moz-animation-delay: 4s;
    -webkit-animation-delay: 4s;
    animation-delay: 4s;
}
.horizon-lines div:nth-child(5) {
    -moz-animation-delay: 5s;
    -webkit-animation-delay: 5s;
    animation-delay: 5s;
}
.horizon-lines div:nth-child(6) {
    -moz-animation-delay: 6s;
    -webkit-animation-delay: 6s;
    animation-delay: 6s;
}
.horizon-lines div:nth-child(7) {
    -moz-animation-delay: 7s;
    -webkit-animation-delay: 7s;
    animation-delay: 7s;
}
.horizon-lines div:nth-child(8) {
    -moz-animation-delay: 8s;
    -webkit-animation-delay: 8s;
    animation-delay: 8s;
}
.horizon-lines div:nth-child(9) {
    -moz-animation-delay: 9s;
    -webkit-animation-delay: 9s;
    animation-delay: 9s;
}
.horizon-lines div:nth-child(10) {
    -moz-animation-delay: 10s;
    -webkit-animation-delay: 10s;
    animation-delay: 10s;
}
.horizon-lines div:nth-child(11) {
    height: 1px;
    -moz-animation-name: none;
    -webkit-animation-name: none;
    animation-name: none;
    filter: progid: DXImageTransform.Microsoft.Alpha(enabled=false);
    opacity: 1;
}
@-moz-keyframes glow {
    0% {
        opacity: 0;
        bottom: 2px;
        height: 4px;
    }
    30% {
        opacity: 1;
    }
    80% {
        bottom: 164px;
    }
    100% {
        bottom: 164px;
        height: 1px;
        opacity: 1;
    }
}
@-webkit-keyframes glow {
    0% {
        opacity: 0;
        bottom: 2px;
        height: 4px;
    }
    30% {
        opacity: 1;
    }
    80% {
        bottom: 164px;
    }
    100% {
        bottom: 164px;
        height: 1px;
        opacity: 1;
    }
}
@keyframes glow {
    0% {
        opacity: 0;
        bottom: 2px;
        height: 4px;
    }
    30% {
        opacity: 1;
    }
    80% {
        bottom: 164px;
    }
    100% {
        bottom: 164px;
        height: 1px;
        opacity: 1;
    }
}

HTML

看起来像是电工在焊接钢管。

Canvas，粒子

编辑器支持Emmet

快捷键

看起来像是电工在焊接钢管。

Canvas，粒子

Canvas 花环波动形状的粒子动画

h5 canvas 水泡状粒子漂浮效果（带光晕和渐变）

编辑器支持Emmet

快捷键

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