HTML5 Canvas炫酷的线条分形动画特效

Animated Line Fractals，可用来构造高性能的蜂窝/网格背景动画。

h5, canvas, math

《aframe.js 3d拼图代码详解》作品已被踏得网收录！

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CSS
JavaScript
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编译

JavaScript

const PHI = (1 + Math.sqrt(5)) / 2, // 1.618033988749895
    maxGeneration = (navigator.userAgent.toLowerCase().indexOf('firefox') > -1) ? 5 : 6,
    frameDuration = 1000 / 60,
    duration = 3000,
    rotationSpeed = 0.3,
    totalIterations = Math.floor(duration / frameDuration),
    maxBaseSize = 100,
    baseSizeSpeed = 0.02;

var canvas = document.getElementById("canvas"),
    ctx = canvas.getContext("2d"),
    canvasWidth = document.documentElement.clientWidth,
    canvasHeight = document.documentElement.clientHeight,
    shapes = [],
    sizeVariation,
    iteration = 0,
    animationDirection = 1,
    sizeVariationRange = .15,
    baseRotation = 0,
    baseSize = 50,
    c1 = 43,
    c1S = 1,
    c2 = 205,
    c2S = 1,
    c3 = 255,
    c3S = 1;

canvas.setAttribute("width", canvasWidth);
canvas.setAttribute("height", canvasHeight);

function Shape(gen, x, y, size, rotation) {
    this.generation = gen;
    this.size = size;
    this.rotation = -rotation;
    this.start = {
        x: x,
        y: y
    };
    this.end = {
        x_1: this.start.x + Math.cos(degToRad(this.rotation)) * this.size,
        y_1: this.start.y + Math.sin(degToRad(this.rotation)) * this.size,
        x_2: this.start.x + Math.cos(degToRad(this.rotation + 360 / 3)) * this.size,
        y_2: this.start.y + Math.sin(degToRad(this.rotation + 360 / 3)) * this.size,
        x_3: this.start.x +
            Math.cos(degToRad(this.rotation + 360 / 3 * 2)) * this.size,
        y_3: this.start.y + Math.sin(degToRad(this.rotation + 360 / 3 * 2)) * this.size
    };

this.init();
}

Shape.prototype.init = function() {
    if (this.generation < maxGeneration) {
        var gen = this.generation + 1,
            newSize = this.size * sizeVariation,
            newRotation = this.rotation;

shapes.push(
            new Shape(gen, this.end.x_1, this.end.y_1, newSize, newRotation)
        );
        shapes.push(
            new Shape(gen, this.end.x_2, this.end.y_2, newSize, newRotation)
        );
        shapes.push(
            new Shape(gen, this.end.x_3, this.end.y_3, newSize, newRotation)
        );
    }
    this.draw();
};

Shape.prototype.draw = function() {
    ctx.beginPath();
    ctx.moveTo(this.start.x, this.start.y);
    ctx.lineTo(this.end.x_1, this.end.y_1);
    ctx.moveTo(this.start.x, this.start.y);
    ctx.lineTo(this.end.x_2, this.end.y_2);
    ctx.moveTo(this.start.x, this.start.y);
    ctx.lineTo(this.end.x_3, this.end.y_3);
    //ctx.closePath();
    ctx.strokeStyle =
        "rgba(" + c1 + "," + c2 + "," + c3 + "," + 1 / this.generation / 5 + ")";
    ctx.stroke();
    //ctx.fill();
};

function animate() {
    //ctx.clearRect(0, 0, canvasWidth, canvasHeight);
    ctx.globalCompositeOperation = "source-over";
    ctx.fillStyle = "rgba(0,0,0,.1)";
    ctx.fillRect(0, 0, canvasWidth, canvasHeight);
    ctx.globalCompositeOperation = "lighter";
    shapes = [];
    shapes.push(
        new Shape(0, canvasWidth / 2, canvasHeight / 2, baseSize, baseRotation)
    );

changeColor();
    iteration++;
    if (baseSize < maxBaseSize) baseSize += baseSizeSpeed;
    baseRotation += rotationSpeed;
    sizeVariation = easeInOutSine(
        iteration,
        1 - sizeVariationRange * animationDirection,
        sizeVariationRange * 2 * animationDirection,
        totalIterations
    );
    if (iteration >= totalIterations) {
        iteration = 0;
        animationDirection *= -1;
    }
    requestAnimationFrame(animate);
}

function degToRad(deg) {
    return Math.PI / 180 * deg;
}

function easeInOutSine(
    currentIteration,
    startValue,
    changeInValue,
    totalIterations
) {
    return (
        changeInValue /
        2 *
        (1 - Math.cos(Math.PI * currentIteration / totalIterations)) +
        startValue
    );
}

function changeColor() {
    if (c1 == 0 || c1 == 255) c1S *= -1;
    if (c2 == 0 || c2 == 255) c2S *= -1;
    if (c3 == 0 || c3 == 255) c3S *= -1;
    c1 += 1 * c1S;
    c2 += 1 * c2S;
    c3 += 1 * c3S;
}

ctx.globalCompositeOperation = "lighter";
animate();

window.addEventListener("resize", function() {
    canvasWidth = document.documentElement.clientWidth;
    canvasHeight = document.documentElement.clientHeight;

canvas.setAttribute("width", canvasWidth);
    canvas.setAttribute("height", canvasHeight);
    ctx.strokeStyle = "rgba(66,134,240,.3)";
    ctx.globalCompositeOperation = "lighter";
});

编译

CSS

HTML

Animated Line Fractals，可用来构造高性能的蜂窝/网格背景动画。

h5, canvas, math

编辑器支持Emmet

快捷键

Animated Line Fractals，可用来构造高性能的蜂窝/网格背景动画。

h5, canvas, math

HTML5 Canvas滤镜特效示例 - 带模糊光晕背景的五角星粒子动画

HTML5 Canvas可定制的粒子游泳动画特效

编辑器支持Emmet

快捷键

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