<!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, substractions, 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>

  <div id="log"></div>

  <div id="target"></div>

  <script>
  function startTesting()
  {

    var targetElement = document.getElementById("target");

    function compareValueCloseTo(property_name, calcValue, epsilon, expectedValue, description)
    {

    test(function()
      {

      targetElement.style.setProperty(property_name, "initial");

      /*
      Since we are running many consecutive tests on the same
      element, then it is necessary to reset its property
      to an initial value before actually re-testing it.
      */

      targetElement.style.setProperty(property_name, calcValue);

      var computedCalcValue = getComputedStyle(targetElement)[property_name];

      /*
      We first strip out the word "matrix" with the
      opening parenthesis "(" and the closing
      parenthesis ")"
      */

      computedCalcValue = computedCalcValue.replace("matrix(", "").replace(")", "");

      /*
      Then, we split the string at each comma ","
      and store the resulting 6 sub-strings into
      tableSplitComputedCalcValue
      */

      var tableSplitCalcValue = computedCalcValue.split(",");

      /*
      We convert the 6 sub-strings into numerical floating values
      so that mathematical operations (substraction, absolute value,
      comparison) can be performed.
      */

      tableSplitCalcValue[0] = parseFloat(tableSplitCalcValue[0]);
      tableSplitCalcValue[1] = parseFloat(tableSplitCalcValue[1]);
      tableSplitCalcValue[2] = parseFloat(tableSplitCalcValue[2]);
      tableSplitCalcValue[3] = parseFloat(tableSplitCalcValue[3]);
      tableSplitCalcValue[4] = parseFloat(tableSplitCalcValue[4]);
      tableSplitCalcValue[5] = parseFloat(tableSplitCalcValue[5]);

      /*
      Now, we execute the same steps with the expectedValue
      */

      targetElement.style.setProperty(property_name, expectedValue);

      var computedExpectedValue = getComputedStyle(targetElement)[property_name];

      /*
      We first strip out the word "matrix" with the
      opening parenthesis "(" and the closing
      parenthesis ")"
      */

      computedExpectedValue = computedExpectedValue.replace("matrix(", "").replace(")", "");

      /*
      Then, we split the string at each comma ","
      and store the resulting 6 sub-strings into
      tableSplitComputedCalcValue
      */

      var tableSplitExpectedValue = computedExpectedValue.split(",");

      /*
      We convert the 6 sub-strings into numerical floating values
      so that mathematical operations (substraction, absolute value,
      comparison) can be performed.
      */

      tableSplitExpectedValue[0] = parseFloat(tableSplitExpectedValue[0]);
      tableSplitExpectedValue[1] = parseFloat(tableSplitExpectedValue[1]);
      tableSplitExpectedValue[2] = parseFloat(tableSplitExpectedValue[2]);
      tableSplitExpectedValue[3] = parseFloat(tableSplitExpectedValue[3]);
      tableSplitExpectedValue[4] = parseFloat(tableSplitExpectedValue[4]);
      tableSplitExpectedValue[5] = parseFloat(tableSplitExpectedValue[5]);

      assert_array_approx_equals(tableSplitCalcValue, tableSplitExpectedValue, epsilon);

      /*
      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).
     */

    } , description);

  }

    /*

    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.

   */


   /* Addition of angle units */


 /* compareValueCloseTo(property_name, calcValue, epsilon, expectedValue, description)  */

    compareValueCloseTo("transform", "rotate(calc(45deg + 45deg))", 0.0001, "rotate(90deg)", "addition of 2 angle units: deg plus deg");

    compareValueCloseTo("transform", "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)
    */

    compareValueCloseTo("transform", "rotate(calc(20deg + 200grad))", 0.0001, "rotate(200deg)", "addition of 2 angle units: deg plus grad");

    compareValueCloseTo("transform", "rotate(calc(200deg + 0.5turn))", 0.0001, "rotate(380deg)", "addition of 2 angle units: deg plus turn");

    compareValueCloseTo("transform", "rotate(calc(45rad + 45rad))", 0.0001, "rotate(90rad)", "addition of 2 angle units: rad plus rad");

    compareValueCloseTo("transform", "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.
    */

    compareValueCloseTo("transform", "rotate(calc(1rad + 0.5turn))", 0.0001, "rotate(237.29578deg)", "addition of 2 angle units: rad plus turn");

    compareValueCloseTo("transform", "rotate(calc(45grad + 45grad))", 0.0001, "rotate(90grad)", "addition of 2 angle units: grad plus grad");

    compareValueCloseTo("transform", "rotate(calc(10grad + 0.5turn))", 0.0001, "rotate(189deg)", "addition of 2 angle units: grad plus turn");

    /*
    10 gradians is 9 degrees.
    */

 /* compareValueCloseTo(property_name, calcValue, epsilon, expectedValue, description)  */


   /* Substraction of angle unit */

 /* compareValueCloseTo(property_name, calcValue, epsilon, expectedValue, description)  */

    compareValueCloseTo("transform", "rotate(calc(45deg - 15deg))", 0.0001, "rotate(30deg)", "substraction of angle unit: deg minus deg");

    compareValueCloseTo("transform", "rotate(calc(90deg - 1rad))", 0.0001, "rotate(32.70422deg)", "substraction of angle unit: deg minus rad");

    /*
    1 radian == 57.295779513 degrees
    */

    compareValueCloseTo("transform", "rotate(calc(38deg - 20grad))", 0.0001, "rotate(20deg)", "substraction of angle unit: deg minus grad");

    compareValueCloseTo("transform", "rotate(calc(360deg - 0.5turn))", 0.0001, "rotate(180deg)", "substraction of angle unit: deg minus turn");

    compareValueCloseTo("transform", "rotate(calc(45rad - 15rad))", 0.0001, "rotate(30rad)", "substraction of angle unit: rad minus rad");

    compareValueCloseTo("transform", "rotate(calc(30rad - 10grad))", 0.0001, "rotate(1709.87339deg)", "substraction of angle unit: rad minus grad");

    /*
    30 radians is 1718.8733854 degrees ; 10 gradians is 9 degrees.
    */

    compareValueCloseTo("transform", "rotate(calc(4rad - 0.1turn))", 0.0001, "rotate(193.18312deg)", "substraction of angle unit: rad minus turn");

    /*
    4 radians is 229.183118052 degrees ; 0.1 turn is 36 degrees.
    */

    compareValueCloseTo("transform", "rotate(calc(45grad - 15grad))", 0.0001, "rotate(30grad)", "substraction of angle unit: grad minus grad");

    compareValueCloseTo("transform", "rotate(calc(100grad - 0.25turn))", 0.0001, "rotate(0deg)", "substraction of angle unit: grad minus turn");


   /* Multiplication of angle unit */

 /* compareValueCloseTo(property_name, calcValue, epsilon, expectedValue, description)  */

    compareValueCloseTo("transform", "rotate(calc(45deg * 2))", 0.0001, "rotate(90deg)", "multiplication of angle unit: deg multiplied by int");

    compareValueCloseTo("transform", "rotate(calc(2 * 45rad))", 0.0001, "rotate(90rad)", "multiplication of angle unit: int multiplied by rad");

    compareValueCloseTo("transform", "rotate(calc(45grad * 2))", 0.0001, "rotate(90grad)", "multiplication of angle unit: grad multiplied by int");

    compareValueCloseTo("transform", "rotate(calc(2 * 45turn))", 0.0001, "rotate(90turn)", "multiplication of angle unit: int multiplied by turn");


   /* Division of angle unit */

 /* compareValueCloseTo(property_name, calcValue, epsilon, expectedValue, description)  */

    compareValueCloseTo("transform", "rotate(calc(90deg / 2))", 0.0001, "rotate(45deg)", "division of angle unit: deg divided by int");

    compareValueCloseTo("transform", "rotate(calc(90rad / 2))", 0.0001, "rotate(45rad)", "division of angle unit: rad divided by int");

    compareValueCloseTo("transform", "rotate(calc(90grad / 2))", 0.0001, "rotate(45grad)", "division of angle unit: grad divided by int");

    compareValueCloseTo("transform", "rotate(calc(90turn / 2))", 0.0001, "rotate(45turn)", "division of angle unit: turn divided by int");

 /* compareValueCloseTo(property_name, calcValue, epsilon, expectedValue, description)  */

    /*

    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  */

 /* compareValueCloseTo(property_name, calcValue, epsilon, expectedValue, description)  */

    compareValueCloseTo("transform", "rotate(calc(50grad)", 0.0001, "rotate(45deg)", "conversion of angle unit: grad into deg");

  }

  startTesting();

  </script>