書式
コンテキスト.shadowBlur = 色
説明
影のぼかし幅を指定します。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Sample</title>
<script>
window.onload = function(){
var canvasObj = document.getElementById("imgCanvas");
var context = canvasObj.getContext("2d");
context.strokeStyle = "rgba(255,0,0,1)";
context.lineWidth = 10;
context.shadowColor = "rgba(0,0,255,0.5)";
context.shadowBlur = 30;
context.shadowOffsetX = 30;
context.shadowOffsetY = 0;
context.beginPath();
context.moveTo(20,20);
context.lineTo(250,80);
context.lineTo(100,200);
context.closePath();
context.stroke();
}
</script>
</head>
<body>
<h1>Sample</h1>
<canvas id="imgCanvas" width="320" height="240" style="border:1px black solid"></canvas>
</body>
</html>