[HTML/HTML5] canvas 엘리먼트 : 복합 변환을 사용해 사각형 그리기

■ canvas 엘리먼트에서 복합 변환을 사용해 사각형을 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.fillRect(0, 0, 100, 100);

                var angle = Math.PI * 45 / 180;

                context.transform(1, 0, 0, 1, 200, 10);
                context.transform(Math.cos(angle), Math.sin(angle), -Math.sin(angle), Math.cos(angle), 0, 0);
                context.transform(2, 0, 0, 2, 0, 0);

                context.fillRect(0, 0, 100, 100);
            }
        </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.fillRect(0, 0, 100, 100);

var angle = Math.PI * 45 / 180;

context.transform(1, 0, 0, 1, 200, 10);

context.transform(Math.cos(angle), Math.sin(angle), -Math.sin(angle), Math.cos(angle), 0, 0);

context.transform(2, 0, 0, 2, 0, 0);

context.fillRect(0, 0, 100, 100);

}

</script>

</head>

</body>

</html>