<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css" rel="stylesheet">
<style>@charset "utf-8";
/*========= レイアウトのためのCSS ===============*/
#wrapper p {
padding: 100px 0;
text-align: center;
}
/*========= waveを描画するエリア設定 ===============*/
.wave {
position: relative;
}
.wave canvas {
position: absolute;
bottom: 0;
left: 0;
width: 100%;
}</style>
</head>
<body>
<body>
<div id="wrapper">
<div class="wave">
<p>コンテンツが入ります。</p>
<canvas id="waveCanvas">
</canvas>
</div>
<p>※参照 <a href="https://jsfiddle.net/39we73t1/" target="_blank">https://jsfiddle.net/39we73t1/</a>
</p>
<!--/wrapper-->
</div>
<script>var unit = 100,
canvasList, // キャンバスの配列
info = {}, // 全キャンバス共通の描画情報
colorList; // 各キャンバスの色情報
/**
* Init function.
*
* Initialize variables and begin the animation.
*/
function init() {
info.seconds = 0;
info.t = 0;
canvasList = [];
colorList = [];
// canvas1個めの色指定
canvasList.push(document.getElementById("waveCanvas"));
colorList.push(["#0ff", "#ff0", "#f00", "#00f", "#f0f"]); //重ねる波線の色設定
// 各キャンバスの初期化
for (var canvasIndex in canvasList) {
var canvas = canvasList[canvasIndex];
canvas.width = document.documentElement.clientWidth; //Canvasのwidthをウィンドウの幅に合わせる
canvas.height = 200; //波の高さ
canvas.contextCache = canvas.getContext("2d");
}
// 共通の更新処理呼び出し
update();
}
function update() {
for (var canvasIndex in canvasList) {
var canvas = canvasList[canvasIndex];
// 各キャンバスの描画
draw(canvas, colorList[canvasIndex]);
}
// 共通の描画情報の更新
info.seconds = info.seconds + 0.014;
info.t = info.seconds * Math.PI;
// 自身の再起呼び出し
setTimeout(update, 35);
}
/**
* Draw animation function.
*
* This function draws one frame of the animation, waits 20ms, and then calls
* itself again.
*/
function draw(canvas, color) {
// 対象のcanvasのコンテキストを取得
var context = canvas.contextCache;
// キャンバスの描画をクリア
context.clearRect(0, 0, canvas.width, canvas.height);
//波線を描画 drawWave(canvas, color[数字（波の数を0から数えて指定）], 透過, 波の幅のzoom,波の開始位置の遅れ )
drawWave(canvas, color[0], 0.8, 3, 0);
drawWave(canvas, color[1], 0.5, 4, 0);
drawWave(canvas, color[2], 0.3, 1.6, 0);
drawWave(canvas, color[3], 0.2, 3, 100);
drawWave(canvas, color[4], 0.5, 1.6, 250);
}
/**
* 波を描画
* drawWave(色, 不透明度, 波の幅のzoom, 波の開始位置の遅れ)
*/
function drawWave(canvas, color, alpha, zoom, delay) {
var context = canvas.contextCache;
context.strokeStyle = color; //線の色
context.lineWidth = 1; //線の幅
context.globalAlpha = alpha;
context.beginPath(); //パスの開始
drawSine(canvas, info.t / 0.5, zoom, delay);
context.stroke(); //線
}
/**
* Function to draw sine
*
* The sine curve is drawn in 10px segments starting at the origin.
* drawSine(時間, 波の幅のzoom, 波の開始位置の遅れ)
*/
function drawSine(canvas, t, zoom, delay) {
var xAxis = Math.floor(canvas.height / 2);
var yAxis = 0;
var context = canvas.contextCache;
// Set the initial x and y, starting at 0,0 and translating to the origin on
// the canvas.
var x = t; //時間を横の位置とする
var y = Math.sin(x) / zoom;
context.moveTo(yAxis, unit * y + xAxis); //スタート位置にパスを置く
// Loop to draw segments (横幅の分、波を描画)
for (i = yAxis; i <= canvas.width + 10; i += 10) {if (window.CP.shouldStopExecution(0)) break;
x = t + (-yAxis + i) / unit / zoom;
y = Math.sin(x - delay) / 3;
context.lineTo(i, unit * y + xAxis);
}window.CP.exitedLoop(0);
}
init();
//# sourceURL=pen.js</script>
</body>
</html>/*
外部依存 CSS:
- https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css
*/
@charset "utf-8";
/*========= レイアウトのためのCSS ===============*/
#wrapper p {
padding: 100px 0;
text-align: center;
}
/*========= waveを描画するエリア設定 ===============*/
.wave {
position: relative;
}
.wave canvas {
position: absolute;
bottom: 0;
left: 0;
width: 100%;
}/*
外部依存 CSS (このデモは下記の CSS にも依存します):
- https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css
*/
var unit = 100,
canvasList, // キャンバスの配列
info = {}, // 全キャンバス共通の描画情報
colorList; // 各キャンバスの色情報
/**
* Init function.
*
* Initialize variables and begin the animation.
*/
function init() {
info.seconds = 0;
info.t = 0;
canvasList = [];
colorList = [];
// canvas1個めの色指定
canvasList.push(document.getElementById("waveCanvas"));
colorList.push(["#0ff", "#ff0", "#f00", "#00f", "#f0f"]); //重ねる波線の色設定
// 各キャンバスの初期化
for (var canvasIndex in canvasList) {
var canvas = canvasList[canvasIndex];
canvas.width = document.documentElement.clientWidth; //Canvasのwidthをウィンドウの幅に合わせる
canvas.height = 200; //波の高さ
canvas.contextCache = canvas.getContext("2d");
}
// 共通の更新処理呼び出し
update();
}
function update() {
for (var canvasIndex in canvasList) {
var canvas = canvasList[canvasIndex];
// 各キャンバスの描画
draw(canvas, colorList[canvasIndex]);
}
// 共通の描画情報の更新
info.seconds = info.seconds + 0.014;
info.t = info.seconds * Math.PI;
// 自身の再起呼び出し
setTimeout(update, 35);
}
/**
* Draw animation function.
*
* This function draws one frame of the animation, waits 20ms, and then calls
* itself again.
*/
function draw(canvas, color) {
// 対象のcanvasのコンテキストを取得
var context = canvas.contextCache;
// キャンバスの描画をクリア
context.clearRect(0, 0, canvas.width, canvas.height);
//波線を描画 drawWave(canvas, color[数字（波の数を0から数えて指定）], 透過, 波の幅のzoom,波の開始位置の遅れ )
drawWave(canvas, color[0], 0.8, 3, 0);
drawWave(canvas, color[1], 0.5, 4, 0);
drawWave(canvas, color[2], 0.3, 1.6, 0);
drawWave(canvas, color[3], 0.2, 3, 100);
drawWave(canvas, color[4], 0.5, 1.6, 250);
}
/**
* 波を描画
* drawWave(色, 不透明度, 波の幅のzoom, 波の開始位置の遅れ)
*/
function drawWave(canvas, color, alpha, zoom, delay) {
var context = canvas.contextCache;
context.strokeStyle = color; //線の色
context.lineWidth = 1; //線の幅
context.globalAlpha = alpha;
context.beginPath(); //パスの開始
drawSine(canvas, info.t / 0.5, zoom, delay);
context.stroke(); //線
}
/**
* Function to draw sine
*
* The sine curve is drawn in 10px segments starting at the origin.
* drawSine(時間, 波の幅のzoom, 波の開始位置の遅れ)
*/
function drawSine(canvas, t, zoom, delay) {
var xAxis = Math.floor(canvas.height / 2);
var yAxis = 0;
var context = canvas.contextCache;
// Set the initial x and y, starting at 0,0 and translating to the origin on
// the canvas.
var x = t; //時間を横の位置とする
var y = Math.sin(x) / zoom;
context.moveTo(yAxis, unit * y + xAxis); //スタート位置にパスを置く
// Loop to draw segments (横幅の分、波を描画)
for (i = yAxis; i <= canvas.width + 10; i += 10) {if (window.CP.shouldStopExecution(0)) break;
x = t + (-yAxis + i) / unit / zoom;
y = Math.sin(x - delay) / 3;
context.lineTo(i, unit * y + xAxis);
}window.CP.exitedLoop(0);
}
init();
//# sourceURL=pen.js