test_2d.fillText.gradient.html

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<!DOCTYPE HTML>

<title>Canvas test: 2d.composite.canvas.xor</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

<body>

<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>

<script>

function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {

    var pixel = ctx.getImageData(x, y, 1, 1);

    var pr = pixel.data[0],

        pg = pixel.data[1],

        pb = pixel.data[2],

        pa = pixel.data[3];

    ok(r-d <= pr && pr <= r+d &&

       g-d <= pg && pg <= g+d &&

       b-d <= pb && pb <= b+d &&

       a-d <= pa && pa <= a+d,

       "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);

SimpleTest.waitForExplicitFinish();

addLoadEvent(function () {

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

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

                                var text                = "I";

                                var colorTop    = 'rgba(255,0,0,1)';

                                var colorBottom = 'rgba(0,255,0,1)';

                                var inset               = 10;

                                var grad                = ctx.createLinearGradient(inset, inset, inset, inset + 30);

                                // add color stops

                                grad.addColorStop(0, colorTop);

                                grad.addColorStop(1, colorBottom);

                                ctx.fillStyle               = grad;

                                ctx.textBaseline    = 'top';

                                ctx.font                    = '110px sans-serif'

                                ctx.fillText(text, -10, -20);

                                ctx.fillText(text, -8, -20);

                                ctx.fillText(text, -6, -20);

                                ctx.fillText(text, -4, -20);

                                ctx.fillText(text, -2, -20);

                                ctx.fillText(text, 0, -20);

                                ctx.fillText(text, 2, -20);

                                ctx.fillText(text, 4, -20);

                                ctx.fillText(text, 6, -20);

                                isPixel(ctx, 15,0, 255,0,0,255, "15,0", "255,0,0,255", 5);

                                isPixel(ctx, 15,49, 0,255,0,255, "15,49", "0,255,0,255", 5);

SimpleTest.finish();

});

</script>