<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Values and Units Test: calc() function with angle values</title>
<!--
Original test is:
https://chromium.googlesource.com/chromium/src/+/c825d655f6aaf73484f9d56e9012793f5b9668cc/third_party/WebKit/LayoutTests/css3/calc/calc-with-time-angle-and-frequency-values.html
Issue 917718: [css-values] calc-with-time-angle-and-frequency-values
test is highly unreliable, transition-delay testing causes side effects
https://bugs.chromium.org/p/chromium/issues/detail?id=917718
-->
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
<link rel="help" href="https://www.w3.org/TR/css-values-3/#calc-computed-value">
<link rel="help" href="https://www.w3.org/TR/css-values-3/#angles">
<meta content="This test checks that additions, subtractions, multiplications and divisions in calc() function when applied to angle units." name="assert">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
<div id="log"></div>
<div id="target"></div>
<script>
function startTesting()
{
/*
In this mega-test of 27 sub-tests, we intentionally
set the tolerance precision (epsilon) to a rather big
value (0.0001 === 100 millionths). The reason for this
is we want to verify if browsers and CSS-capable
applications do the right calculations. We do not want
to penalize browsers and CSS-capable applications that
have modest precision (not capable of a 1 millionth
level precision).
*/
// testTransformValuesCloseTo(property_name, calcValue, epsilon, expectedValue, description)
testTransformValuesCloseTo("rotate(calc(45deg + 45deg))", 0.0001, "rotate(90deg)", "addition of 2 angle units: deg plus deg");
testTransformValuesCloseTo("rotate(calc(45deg + 1rad))", 0.0001, "rotate(102.29578deg)", "addition of 2 angle units: deg plus rad");
/*
1 radian == 57.295779513 degrees
The original test was using the slightly imprecise rotate(102.3deg)
*/
testTransformValuesCloseTo("rotate(calc(20deg + 200grad))", 0.0001, "rotate(200deg)", "addition of 2 angle units: deg plus grad");
testTransformValuesCloseTo("rotate(calc(200deg + 0.5turn))", 0.0001, "rotate(380deg)", "addition of 2 angle units: deg plus turn");
testTransformValuesCloseTo("rotate(calc(45rad + 45rad))", 0.0001, "rotate(90rad)", "addition of 2 angle units: rad plus rad");
testTransformValuesCloseTo("rotate(calc(1rad + 40grad))", 0.0001, "rotate(93.29578deg)", "addition of 2 angle units: rad plus grad");
// 1 radian == 57.295779513 degrees; 40 gradians is 36 degrees.
testTransformValuesCloseTo("rotate(calc(1rad + 0.5turn))", 0.0001, "rotate(237.29578deg)", "addition of 2 angle units: rad plus turn");
testTransformValuesCloseTo("rotate(calc(45grad + 45grad))", 0.0001, "rotate(90grad)", "addition of 2 angle units: grad plus grad");
testTransformValuesCloseTo("rotate(calc(10grad + 0.5turn))", 0.0001, "rotate(189deg)", "addition of 2 angle units: grad plus turn");
// 10 gradians is 9 degrees.
// subtraction of angle unit
testTransformValuesCloseTo("rotate(calc(45deg - 15deg))", 0.0001, "rotate(30deg)", "subtraction of angle unit: deg minus deg");
testTransformValuesCloseTo("rotate(calc(90deg - 1rad))", 0.0001, "rotate(32.70422deg)", "subtraction of angle unit: deg minus rad");
// 1 radian == 57.295779513 degrees
testTransformValuesCloseTo("rotate(calc(38deg - 20grad))", 0.0001, "rotate(20deg)", "subtraction of angle unit: deg minus grad");
testTransformValuesCloseTo("rotate(calc(360deg - 0.5turn))", 0.0001, "rotate(180deg)", "subtraction of angle unit: deg minus turn");
testTransformValuesCloseTo("rotate(calc(45rad - 15rad))", 0.0001, "rotate(30rad)", "subtraction of angle unit: rad minus rad");
testTransformValuesCloseTo("rotate(calc(30rad - 10grad))", 0.0001, "rotate(1709.87339deg)", "subtraction of angle unit: rad minus grad");
// 30 radians is 1718.8733854 degrees ; 10 gradians is 9 degrees.
testTransformValuesCloseTo("rotate(calc(4rad - 0.1turn))", 0.0001, "rotate(193.18312deg)", "subtraction of angle unit: rad minus turn");
// 4 radians is 229.183118052 degrees ; 0.1 turn is 36 degrees.
testTransformValuesCloseTo("rotate(calc(45grad - 15grad))", 0.0001, "rotate(30grad)", "subtraction of angle unit: grad minus grad");
testTransformValuesCloseTo("rotate(calc(100grad - 0.25turn))", 0.0001, "rotate(0deg)", "subtraction of angle unit: grad minus turn");
// Multiplication of angle unit
testTransformValuesCloseTo("rotate(calc(45deg * 2))", 0.0001, "rotate(90deg)", "multiplication of angle unit: deg multiplied by int");
testTransformValuesCloseTo("rotate(calc(2 * 45rad))", 0.0001, "rotate(90rad)", "multiplication of angle unit: int multiplied by rad");
testTransformValuesCloseTo("rotate(calc(45grad * 2))", 0.0001, "rotate(90grad)", "multiplication of angle unit: grad multiplied by int");
testTransformValuesCloseTo("rotate(calc(2 * 45turn))", 0.0001, "rotate(90turn)", "multiplication of angle unit: int multiplied by turn");
// Division of angle unit
testTransformValuesCloseTo( "rotate(calc(90deg / 2))", 0.0001, "rotate(45deg)", "division of angle unit: deg divided by int");
testTransformValuesCloseTo("rotate(calc(90rad / 2))", 0.0001, "rotate(45rad)", "division of angle unit: rad divided by int");
testTransformValuesCloseTo("rotate(calc(90grad / 2))", 0.0001, "rotate(45grad)", "division of angle unit: grad divided by int");
testTransformValuesCloseTo("rotate(calc(90turn / 2))", 0.0001, "rotate(45turn)", "division of angle unit: turn divided by int");
/*
deg
Degrees. There are 360 degrees in a full circle.
grad
Gradians, also known as "gons" or "grades". There are 400 gradians in a full circle.
rad
Radians. There are 2π radians in a full circle.
1rad == 57.295779513°
https://www.rapidtables.com/convert/number/radians-to-degrees.html
π == Math.PI == 3.141592653589793
turn
Turns. There is 1 turn in a full circle.
*/
// Testing conversion of angle unit
testTransformValuesCloseTo("rotate(calc(50grad)", 0.0001, "rotate(45deg)", "conversion of angle unit: grad into deg");
}
startTesting();
</script>
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