[英]how to connect circles with line vertically if clicked on circle it should fill with color
[英]How to fill a circle with color when clicked on a correspong link using html5
我已經嘗試了這么多的代碼。 我旁邊有兩個圓圈,其中一個鏈接,我需要為相應鏈接的onclick圓圈上色。 提出一些解決方案
<body>
<div class="row-fluid">
<div class="span1 offset3">
<canvas id="myCanvas" width="100" height="100"></canvas>
</div>
<div class="span1">
<br/><a href="#" onclick="function();">Hello</a>
</div>
<div class="span1">
<canvas id="myCanvas1" width="100" height="100"></canvas>
</div>
<div class="span1">
<br/><a href="#" onclick="function();">Hi</a>
</div>
</div>
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(55, 30, 20, 0, 2 * Math.PI);
ctx.stroke();
var c = document.getElementById("myCanvas1");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(55, 30, 20, 0, 2 * Math.PI);
ctx.stroke();
function () {
//onclick function which will change the color of the correspondind circle
}
</script>
</body>
單擊html鏈接時如何填充畫布圓
這是一個靈活的函數,可以繪制一個圓並可選地填充該圓:
function drawCircle(context,fill){
context.beginPath();
context.arc(55, 30, 20, 0, 2 * Math.PI);
context.closePath();
context.stroke();
if(fill){
context.fill()
}
}
jQuery可以監聽錨點的點擊。
然后,jQuery使用fill = true調用drawCircle函數(圓被填充)
// fill the circle on click
$("#c1").click(function(){ drawCircle(ctx,true); });
$("#c2").click(function(){ drawCircle(ctx1,true); });
這是代碼和小提琴: http : //jsfiddle.net/m1erickson/8LGPB/
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; padding:20px; }
canvas{border:1px solid red;}
</style>
<script>
$(function(){
var canvas=document.getElementById("myCanvas");
var ctx=canvas.getContext("2d");
var canvas1=document.getElementById("myCanvas1");
var ctx1=canvas1.getContext("2d");
// draw stroked but not filled circles
drawCircle(ctx,false);
drawCircle(ctx1,false);
function drawCircle(context,fill){
context.beginPath();
context.arc(55, 30, 20, 0, 2 * Math.PI);
context.closePath();
context.stroke();
if(fill){
context.fill()
}
}
// fill the circle on click
$("#c1").click(function(){ drawCircle(ctx,true); });
$("#c2").click(function(){ drawCircle(ctx1,true); });
}); // end $(function(){});
</script>
</head>
<body>
<div class="row-fluid">
<div class="span1 offset3">
<canvas id="myCanvas" width="100" height="100"></canvas>
</div>
<div class="span1">
<br/><a id="c1" href="#">Hello</a>
</div>
<div class="span1">
<canvas id="myCanvas1" width="100" height="100"></canvas>
</div>
<div class="span1">
<br/><a id="c2" href="#">Hi</a>
</div>
</div>
</body>
</html>
對每個功能使用此代碼腳本標記
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var centerX = canvas.width / 2;
var centerY = canvas.height / 2;
var radius = 70;
context.beginPath();
context.arc(centerX, centerY, radius, 0, 2 * Math.PI, false);
context.fillStyle = 'blue';
context.fill();
context.lineWidth = 5;
context.strokeStyle = '#003300';
context.stroke();
</script>
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