getrotationofchar.html

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This WPT test may be referenced by the following Test IDs:
- /svg/text/scripted/getrotationofchar.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>SVGTextContentElement.getRotationOfChar</title>

<link rel="help" href="https://svgwg.org/svg2-draft/text.html#__svg__SVGTextContentElement__getRotationOfChar">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<svg id="container" width="800" height="300"></svg>

<script>

function createSVGElement(localPart, attributes, textOrElement) {

  const element = document.createElementNS('http://www.w3.org/2000/svg', localPart);

  for (let name in attributes) {

    element.setAttribute(name, attributes[name]);

  if (typeof(textOrElement) == 'string')

    element.textContent = textOrElement;

  else if (textOrElement instanceof Element)

    element.appendChild(textOrElement);

  else if (textOrElement !== undefined)

    throw new TypeError('The third argument should be a string or an Element');

  return element;

function normalize(rotation) {

  return rotation - 360 * Math.floor(rotation / 360);

function normalizedRotation(element, index) {

  return normalize(element.getRotationOfChar(index));

const container = document.querySelector('#container');

['horizontal-tb', 'vertical-rl', 'vertical-lr', 'sideways-rl', 'sideways-lr'].forEach(mode => {

  const isHorizontal = mode == 'horizontal-tb';

  const isVertical = mode == 'vertical-rl' || mode == 'vertical-lr';

  const sidewaysDelta = 90 * ((mode == 'sideways-rl') - (mode == 'sideways-lr'));

  container.style.writingMode = mode;

  test(() => {

    container.style.textOrientation = 'mixed';

    const element = container.appendChild(createSVGElement('text', {}, '  M月X'));

    assert_equals(element.getRotationOfChar(0), isVertical ? 90 : sidewaysDelta, 'M');

    assert_equals(element.getRotationOfChar(1), sidewaysDelta, '月');

    assert_equals(element.getRotationOfChar(2), isVertical ? 90 : sidewaysDelta, 'X');

  }, `'text-orientation: mixed' - ${mode}`);

  test(() => {

    container.style.textOrientation = 'upright';

    const element = container.appendChild(createSVGElement('text', {}, 'T火'));

    assert_equals(element.getRotationOfChar(0), sidewaysDelta, 'T');

    assert_equals(element.getRotationOfChar(1), sidewaysDelta, '火');

  }, `'text-orientation: upright' - ${mode}`);

  test(() => {

    container.style.textOrientation = 'sideways';

    const element = container.appendChild(createSVGElement('text', {}, 'W水'));

    assert_equals(element.getRotationOfChar(0), isVertical ? 90 : sidewaysDelta, 'W');

    assert_equals(element.getRotationOfChar(1), isVertical ? 90 : sidewaysDelta, '水');

  }, `'text-orientation: sideways' - ${mode}`);

  test(() => {

    container.style.textOrientation = 'mixed';

    const element = container.appendChild(

        createSVGElement('text', {rotate: '0 180.5 360 365 -10'}, 't木cde'));

    const shift = isHorizontal ? 0 : 90 * (mode == 'sideways-rl' || isVertical) + 270 * (mode == 'sideways-lr');

    assert_equals(normalizedRotation(element, 0), 0 + shift, 't');

    assert_equals(normalizedRotation(element, 1), 180.5 + sidewaysDelta, '木');

    assert_equals(normalizedRotation(element, 2), 0 + shift, 'c');

    assert_equals(normalizedRotation(element, 3), 5 + shift, 'd');

    assert_equals(normalizedRotation(element, 4), normalize(350 + shift), 'e');

  }, `Rotation attribute - ${mode}`);

  test(() => {

    container.style.textOrientation = 'mixed';

    container.appendChild(createSVGElement('path', {id: 'path1', d: 'M 40 40 L 200 200'}));

    const element = container.appendChild(

        createSVGElement('text', {rotate: '0 0 25'},

            createSVGElement('textPath', {href: '#path1'}, 'F金r')));

    const shift = (mode == 'sideways-lr') ? 180 : 0;

    assert_equals(normalizedRotation(element, 0), 45 + shift, 'F');

    assert_equals(normalizedRotation(element, 1), isVertical ? 315 : 45 + shift, '金');

    assert_equals(normalizedRotation(element, 2), 45 + 25 + shift, 'r');

  }, `<textPath> - ${mode}`);

});

</script>