canvas模擬eharts首頁動畫效果

antzone發表於2018-07-06
Canvas動畫

分享一段程式碼例項，它利用canvas模擬實現了eharts首頁動畫效果。

程式碼例項如下:

[HTML] 純文字檢視 複製程式碼執行程式碼
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>螞蟻部落</title>
<style>
* {
  margin: 0;
  padding: 0;
}
html, body {
  width: 100%;
  height: 100%;
}
body {
  background: -webkit-linear-gradient(#4f7e9a,#2a3d56);
}
#sin {
  display: block;
}
.wrap {
  width: 0;
  height: 200px;
  position: absolute;
  bottom: 40px;
  left: 0;
  overflow: hidden;
  animation: kk 2.4s linear forwards;
}
@keyframes kk {
  0% {
    width: 0;
    height: 200px;
  }
  100% {
    width: 100%;
    height: 200px;
  }
}
.shadow {
  width: 50%;
  position: absolute;
  top: 380px;
  left: -100%;
  animation: img 1s cubic-bezier(0.665, -0.570, 0.420, 1.650) forwards 1s;
}
@keyframes img {
  0% {
    left: -100%;
    transform: translateX(0);
  }
  100% {
    left: 50%;
    transform: translateX(-56%);
  }
}
#word {
  display: block;
  position: absolute;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  animation: hah 1s cubic-bezier(0.665, -0.570, 0.420, 1.650) forwards;
}
@keyframes hah {
  0% {
    transform: translateX(-50%) scale(.3);
  }
  100% {
    transform: translateX(-50%) scale(1);
  }
}
</style>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
</head>
<body>
<canvas id="word" width="1000" height="200"></canvas>
<div class="wrap">
  <canvas id="sin" height="200"></canvas>
</div>
<script>
var screenWidth = document.documentElement.clientWidth;
$("#sin").attr("width", screenWidth);
var line = document.getElementById("sin");
var myCanvas = line.getContext("2d");
myCanvas.lineWidth = 2;
myCanvas.strokeStyle = "#fff";
 
myCanvas.beginPath();
myCanvas.translate(20, 100);
myCanvas.moveTo(-100, 50);
for (var i = 0; i < 80; i += 0.1) {
  var x = i * 80 - 40;
  var y = Math.cos(i) * 50;
  myCanvas.lineTo(x, y);
}
myCanvas.stroke();
myCanvas.closePath();
 
myCanvas.lineWidth = 1;
myCanvas.strokeStyle = "rgba(255,255,255,.8)";
myCanvas.beginPath();
myCanvas.translate(15, -30);
myCanvas.moveTo(-100, 40);
for (var i = -2; i < 80; i += 0.1) {
  var x = i * 60 - 40;
  var y = Math.cos(i) * 40;
  myCanvas.lineTo(x, y);
}
myCanvas.stroke();
myCanvas.closePath();
 
myCanvas.strokeStyle = "rgba(255,255,255,.5)";
myCanvas.beginPath();
myCanvas.translate(5, -46);
myCanvas.moveTo(-90, 40);
for (var i = 0; i < 80; i += 0.1) {
  var x = i * 46 - 90;
  var y = Math.cos(i) * 16;
  myCanvas.lineTo(x, y);
}
myCanvas.stroke();
myCanvas.closePath();
 
/*  eCharts  */
var line2 = document.getElementById("word");
var myCanvas2 = line2.getContext("2d");
 
var timer = null;
var angle = 0;
var flag = 0;
var $deg = 0;
draw(0);
 
timer = setInterval(function() {
  flag++;
  if (flag >= 120) {
    angle--;
    // console.log(angle);
    if (angle <= -40) {
      clearInterval(timer);
    }
    $deg = angle * Math.PI / 180;
 
    draw($deg);
  }
}, 20);
 
myCanvas2.save();
myCanvas2.font = "150px Arial";
myCanvas2.beginPath();
myCanvas2.translate(210, 120);
myCanvas2.strokeStyle = "white";
myCanvas2.fillStyle = "white";
myCanvas2.fillText("charts 3", 30, 30);
myCanvas2.stroke();
myCanvas2.fill();
myCanvas2.closePath();
myCanvas2.restore();
 
function draw(deg) {
  myCanvas2.save();
 
  myCanvas2.beginPath();
  myCanvas2.translate(190, 150);
  myCanvas2.clearRect(-80, -100, 132, 120);
  myCanvas2.rotate(deg);
  //myCanvas2.strokeStyle = "rgba(170,49,77,.95)";
  myCanvas2.fillStyle = "rgba(170,49,77,.95)";
  myCanvas2.font = "160px Arial";
  myCanvas2.fillText("e", -30, 10);
  //myCanvas2.stroke();
  myCanvas2.fill();
  myCanvas2.rotate(-deg);
  myCanvas.closePath();
  myCanvas2.restore();
}
</script>
</body>
</html>

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