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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas test: 2d.text.drawing.style.letterSpacing.measure</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<body class="show_output">
<h1>2d.text.drawing.style.letterSpacing.measure</h1>
<p class="desc">Testing letter spacing with different length units</p>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<ul id="d"></ul>
<script>
var t = async_test("Testing letter spacing with different length units");
_addTest(function(canvas, ctx) {
_assertSame(ctx.letterSpacing, '0px', "ctx.letterSpacing", "'0px'");
_assertSame(ctx.wordSpacing, '0px', "ctx.wordSpacing", "'0px'");
var width_normal = ctx.measureText('Hello World').width;
function test_letter_spacing(value, difference_spacing, epsilon) {
ctx.letterSpacing = value;
_assertSame(ctx.letterSpacing, value, "ctx.letterSpacing", "value");
_assertSame(ctx.wordSpacing, '0px', "ctx.wordSpacing", "'0px'");
width_with_letter_spacing = ctx.measureText('Hello World').width;
assert_approx_equals(width_with_letter_spacing, width_normal + difference_spacing, epsilon, "letter spacing doesn't work.");
}
// The first value is the letter Spacing to be set, the second value the
// change in length of string 'Hello World', note that there are 11 letters
// in 'hello world', so the length difference is always letterSpacing * 11.
// and the third value is the acceptable differencee for the length change,
// note that unit such as 1cm/1mm doesn't map to an exact pixel value.
test_cases = [['3px', 33, 0.1],
['5px', 55, 0.1],
['-2px', -22, 0.1],
['1em', 110, 0.1],
['-0.1em', -11, 0.1],
['1in', 1056, 0.1],
['-0.1cm', -41.65, 0.2],
['-0.6mm', -24,95, 0.2]]
for (const test_case of test_cases) {
test_letter_spacing(test_case[0], test_case[1], test_case[2]);
}
});
</script>
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