<html>
<head>
<script type="text/javascript">
function assert(cond, msg) { if (!cond) { throw msg; } }
function isSameTM(m1, m2) {
// XXX this is probably the ugliest possible way to write this function,
// but it's intended to be lowest-common-denominator
if (!(m1.length === 6 && m1.length === m2.length)) {
return false;
}
for (var i = 0; i < m1.length; ++i) {
if (m1[i] !== m2[i]) {
return false;
}
}
return true;
}
window.onload = function() {
var IM = [ 1, 0, 0, 1, 0, 0 ];
try {
var ctx = document.getElementById("c1").getContext("2d");
assert(isSameTM(IM, ctx.mozCurrentTransform),
"currentTransform is identity by default");
assert(isSameTM(IM, ctx.mozCurrentTransformInverse),
"currentTransformInverse is identity by default");
var m = [ 1, 2, 3, 4, 5, 6 ];
ctx.mozCurrentTransform = m;
assert(isSameTM(m, ctx.mozCurrentTransform),
"currentTransform successfully set");
var badVals = [ -1,
"string",
{ obj: true },
[ "array of string" ],
[ -1 ],
[ "string", 1, 2, 3, 4, 5 ],
[ { obj: true }, 1, 2, 3, 4, 5 ],
];
for (var i = 0; i < badVals.length; ++i) {
var error = false;
try { ctx.mozCurrentTransform = badVals[i]; }
catch(e) { error = true; }
assert(error && isSameTM(m, ctx.mozCurrentTransform),
"Expected |currentTransform = "+ badVals[i] +"| to throw exception and not change .currentTransform");
error = false;
try { ctx.mozCurrentTransformInverse = badVals[i]; }
catch(e) { error = true; }
assert(error && isSameTM(m, ctx.mozCurrentTransform),
"Expected |currentTransformInverse = "+ badVals[i] +"| to throw exception and not change .currentTransform");
}
ctx.mozCurrentTransform = IM;
var noopVals = [ [ Number.NaN, 1, 2, 3, 4, 5 ],
[ Infinity, 1, 2, 3, 4, 5 ],
];
for (var i = 0; i < noopVals.length; ++i) {
ctx.mozCurrentTransform = noopVals[i];
assert(isSameTM(ctx.mozCurrentTransform, IM),
"Illegal float values result in no-ops (sigh)");
}
ctx.mozCurrentTransform = IM;
ctx.setTransform(m[0], m[1], m[2], m[3], m[4], m[5]);
assert(isSameTM(ctx.mozCurrentTransform, m),
"setTransform() updates currentTransform");
} catch (e) {
document.body.innerHTML = "FAIL: "+ e.toString();
return;
}
document.body.innerHTML = "Pass";
}
</script>
</head>
<body>
<div><canvas id="c1" width="300" height="300"></canvas></div>
</body>
</html>