css3 html5画心

以下内容不是原创 我是搬运工

1.

<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8"/>
<title>myHeart</title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
.heart{
position:absolute;
left: 50%;
top:50%;
margin-left: -150px;
margin-top: -135px;
width: 300px;
height:270px;
background: transparent;
/*box-shadow: 2px 2px 5px #000;*/
filter:drop-shadow(0px 0px 20px rgb(255,20,20));
animation: test 1s linear infinite;
}
.heart:before,
.heart:after{
content: "";
position: absolute;
left: 150px;
width: 150px;
height: 240px;
background: rgb(255,0,0);
border-radius: 150px 150px 0 0;
transform:rotate(-45deg);
transform-origin: 0 100%;
}
.heart:after{
left: 0;
transform:rotate(45deg);
transform-origin: 100% 100%;
}
@keyframes test{
0%{
transform: scale(0.8,0.8);
opacity: 1;
}
25%{
transform: scale(1,1);
opacity: 0.8;
}
100%{
transform: scale(0.8,0.8);
opacity: 1;
}
}
</style>
</head>
<body>
<div class="heart"></div>
<script>
// alert(window.navigator.userAgent);
</script>
</body>
</html>

2.

<!DOCTYPE html>
<html>
<head>
<title>Draw Heart</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}

html {
height: 100%;
margin: 0;
}

body {
height: 100%;
background-color:white;
}

#canvasZone {
width: 100%;
height: 100%;
text-align: center;
background-color: black;
}

#myCanvas {
height:100%;
display: block;
/*background-color:aqua;*/
}
</style>
<script type="text/javascript">
var arr = [];//保存所有的XY坐标，只为验证。实际程序中可删除。
var r = 4;
var radian;//弧度
var i;
var radianDecrement;//弧度增量
var time = 10;//每个点之间的时间间隔
var intervalId;
var num = 360;//分割为 360 个点
var startRadian = Math.PI;
var ctx;
window.onload = function () {
startAnimation();
}
function startAnimation() {
ctx = document.getElementById("myCanvas").getContext("2d");
//让画布撑满整个屏幕，-20是滚动条的位置，需留出。如滚动条出现则会挤压画布。
WINDOW_HEIGHT=document.documentElement.clientHeight-20;
WINDOW_WIDTH=document.documentElement.clientWidth-20;
ctx.width = WINDOW_WIDTH;
ctx.heigh = WINDOW_HEIGHT;
drawHeart();
}

function drawHeart() {

ctx.strokeStyle = "red";
ctx.lineWidth = 1;//设置线的宽度
radian = startRadian;//弧度设为初始弧度
radianDecrement = Math.PI / num * 2;
ctx.moveTo(getX(radian), getY(radian));//移动到初始点
i = 0;
intervalId = setInterval("printHeart()", time);
}
//x = 16 sin^3 t, y = (13 cos t - 5 cos 2t - 2 cos 3t - cos 4t)
function printHeart() {
radian += radianDecrement;
ctx.lineTo(getX(radian), getY(radian));//在旧点和新点之间连线
//arr.push("X:" + getX(radian) + "<br/>Y:" + getY(radian) + "<br/>");
i++;
ctx.stroke();//画线
if (i >= num) {
clearInterval(intervalId);
//document.getElementById("bs").innerHTML = arr.join("");//打印所有的XY坐标点。
}
}
function getX(t) {//由弧度得到 X 坐标
return 100 + r * (16 * Math.pow(Math.sin(t), 3));
}

function getY(t) {//由弧度得到 Y 坐标
return 50 - r * (13 * Math.cos(t) - 5 * Math.cos(2 * t) - 2 * Math.cos(3 * t) - Math.cos(4 * t));
}
</script>
</head>
<body>
<div id="canvasZone">
<canvas id="myCanvas"></canvas>
</div>
<div id="bs">
</div>
</body>
</html>