html5 canvas海底水草动画特效

来源：互联网 2023-03-16 19:11:05 388

工具/原料

adobe dreamweaver

方法/步骤

新建html文档。

html5 canvas海底水草动画特效

书写hmtl代码。

canvas>/canvas>

div>html5 canvas海底水草动画特效/div>

div>只兼容高版本浏览器 IE8以下无效/div>

html5 canvas海底水草动画特效

书写css代码。

style>

* {

margin:0;

padding:0;

}

canvas {

display:block;

}

/style>

这里没有做所有html标签的初始化，根据个人项目自己初始化标签默认样式。

html5 canvas海底水草动画特效

书写并添加js代码。

script>

var canvas, ctx, width, height, stems, bubbles;

stems = [];

bubbles = [];

function Bubble(x, y, radius) {

this.x = x;

this.y = y;

this.radius = radius;

this.vy = -Math.random() * 5;

this.opacity = 0.2 Math.random() * 0.5;

this.oldY = y;

}

Bubble.prototype.draw = function() {

var strokeColor, fillColor;

strokeColor = 'rgba(255, 255, 255,' this.opacity ')';

fillColor = 'rgba(255, 255, 255,' (this.opacity / 2) ')';

ctx.save();

ctx.lineWidth = 0.8;

ctx.strokeStyle = strokeColor;

ctx.fillStyle = fillColor;

ctx.beginPath();

ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, true);

ctx.closePath();

ctx.fill();

ctx.stroke();

ctx.restore();

}

function Stem(points, color) {

this.points = points;

this.color = color;

}

Stem.prototype.draw = function(ctx) {

var len, ctrlPoint, point;

len = this.points.length - 1;

ctrlPoint = {x: 0, y: 0};

ctx.save();

ctx.strokeStyle = this.color;

ctx.beginPath();

ctx.moveTo(this.points[this.points.length - 1].x, this.points[this.points.length - 1].y);

for (var i = len; i >= 1; i--) {

point = this.points[i];

ctrlPoint.x = (point.x this.points[i - 1].x) / 2;

ctrlPoint.y = (point.y this.points[i - 1].y) / 2;

ctx.quadraticCurveTo(point.x, point.y, ctrlPoint.x, ctrlPoint.y);

ctx.lineWidth = i * 1.1;

ctx.stroke();

ctx.fillStyle = 'red';

}

ctx.restore();

}

init();

function init(){

canvas = document.querySelector('canvas');

ctx = canvas.getContext('2d');

width = canvas.width = window.innerWidth;

height = canvas.height = window.innerHeight;

populateStems(height / 3, width, 25);

generateBubbles(50);

drawFrame();

};

function generateBubbles(bubblesLimit) {

for (var i = 0; i = bubblesLimit; i ) {

bubbles.push(new Bubble(Math.random() * width, height Math.random() * height / 2, 2 Math.random() * 2));

}

function populateStems(offset, limit, step) {

for (var x = 0; x = limit; x = step) {

generateStem(x, height / 2 - offset / 2 Math.random() * offset, 50)

}

function generateStem(x, pointsLen, step) {

var positions, y, offset, colorsArr, color;

colorsArr = ['#6e881b', '#5d7314', '#54690f', '#657f0f', '#6f8f06'];

color = Math.floor(1 Math.random() * colorsArr.length - 1);

positions = [];

if (height 600) {

offset = -40 Math.random() * 80;

for (y = height - pointsLen; y = height 100; y = step / 2) {

positions.push({x: x offset / (y / 2000), y: y, angle: Math.random() * 360, speed: 0.1 Math.random() * 0.3});

}

} else {

offset = -100 Math.random() * 200;

for (y = height - pointsLen; y = height 100; y = step) {

positions.push({x: x offset / (y / 2000), y: y, angle: Math.random() * 360, speed: 0.1 Math.random() * 0.3});

}

stems.push(new Stem(positions, colorsArr[color]));

}

function drawFrame() {

window.requestAnimationFrame(drawFrame, canvas);

ctx.fillStyle = '#17293a';

ctx.fillRect(0, 0, width, height);

bubbles.forEach(moveBubble);

stems.forEach(function(stem) {

stem.points.forEach(movePoint);

stem.draw(ctx);

});

}

function moveBubble(bubble) {

if (bubble.y bubble.radius = 0) bubble.y = bubble.oldY;

bubble.y = bubble.vy;

bubble.draw(ctx);

}

function movePoint(point, index) {

point.x = Math.sin(point.angle) / (index / 2.2);

point.angle = point.speed;

}

/script>

html5 canvas海底水草动画特效

代码整体结构。

html5 canvas海底水草动画特效

查看效果。

html5 canvas海底水草动画特效

6本页面未经授权抓取自百度经验

以上方法由办公区教程网编辑摘抄自百度经验可供大家参考！

标签： HTML

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