Lollipop MR1  |  5.1.0_r3
Html程序  |  42行  |  1.2 KB 

<html>
<body>
This is a test of our ability to convert a canvas to a data url and use it as a cursor. We pass if the cursor animates smoothly and without flickering.<br>
See https://bugs.webkit.org/show_bug.cgi?id=64321.
<canvas id="c" width="40" height="40"></canvas>
<script type="text/javascript">
var icon = new Image;
icon.src = 'resources/drag-image.png'

function drawArrow(angle) {
    var canvas = document.getElementById('c');
    canvas.width = canvas.width // reset canvas
    var ctx = canvas.getContext('2d');

    ctx.translate(ctx.canvas.width / 2, ctx.canvas.height / 2);
    ctx.rotate(angle);
    ctx.drawImage(icon, -icon.width / 2, -icon.height / 2);

    var x = 20;//Math.floor(Math.cos(angle) * icon.width / 2) + icon.width / 2;
    var y = 20;//Math.floor(Math.sin(angle) * icon.width / 2) + icon.width / 2;

    var data = canvas.toDataURL();
    if (data)
        document.body.style.cursor = 'url('+data+') ' + x + ' ' + y + ', pointer';
    else
        console.log('failure');
}

(function() {
    var angle = 0;
    var run = function() {
        angle += Math.PI / 16;
        drawArrow(angle);
        setTimeout(run, 100);
    };
    run();
})();
    drawArrow();
</script>
</body>
</html>