[HTML/HTML5] canvas 엘리먼트 : 원 그리기

■ canvas 엘리먼트에서 원을 그리는 방법을 보여준다.

▶ test.html


<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <script language="javascript">
            function onLoad()
            {
                var canvas  = document.getElementById('canvas');
                var context = canvas.getContext('2d');

                context.beginPath();
                context.arc(canvas.width / 2, canvas.height / 2, canvas.width / 2, 0, Math.PI * 2, false);
                context.fillStyle = 'rgb(255, 0, 0)';
                context.fill();

                context.beginPath();
                context.arc(canvas.width / 2, canvas.height / 2, canvas.width / 4, 0, Math.PI, false);
                context.fillStyle = 'rgb(0, 0, 255)';
                context.fill();

                context.beginPath();
                context.arc(canvas.width / 2, canvas.height / 2, canvas.width / 4, 0, Math.PI, true);
                context.fillStyle = 'rgb(0, 255, 0)';
                context.fill();
            }
        </script>
    </head>
    <body onload="onLoad();">
        <canvas id="canvas" width="400" height="400" />
    </body>
</html>

<!DOCTYPE html>

<html>

<head>

function onLoad()

{

var canvas = document.getElementById('canvas');

var context = canvas.getContext('2d');

context.beginPath();

context.arc(canvas.width / 2, canvas.height / 2, canvas.width / 2, 0, Math.PI * 2, false);

context.fillStyle = 'rgb(255, 0, 0)';

context.fill();

context.beginPath();

context.arc(canvas.width / 2, canvas.height / 2, canvas.width / 4, 0, Math.PI, false);

context.fillStyle = 'rgb(0, 0, 255)';

context.fill();

context.beginPath();

context.arc(canvas.width / 2, canvas.height / 2, canvas.width / 4, 0, Math.PI, true);

context.fillStyle = 'rgb(0, 255, 0)';

context.fill();

}

</script>

</head>

</body>

</html>