number-exponent.html

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This WPT test may be referenced by the following Test IDs:
- /svg/path/parsing/number-exponent.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>SVG Path Data: Number parsing - scientific notation with exponents</title>

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

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

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

</head>

<body>

<svg id="svg" width="400" height="400">

  <!-- Test various exponent formats -->

  <path id="test1" d="M 1e2,1e2 L 2E2,1.5e2" fill="none" stroke="black" stroke-width="2"/>

  <!-- Reference: explicit decimal values -->

  <path id="ref1" d="M 100,100 L 200,150" fill="none" stroke="red" stroke-width="1"/>

</svg>

<script>

test(function() {

  const testPath = document.getElementById('test1');

  const refPath = document.getElementById('ref1');

  const testLength = testPath.getTotalLength();

  const refLength = refPath.getTotalLength();

  assert_approx_equals(testLength, refLength, 0.1,

    "Path with exponents should match explicit decimal version");

}, "Number parsing: 1e2 equals 100, 2E2 equals 200, 1.5e2 equals 150");

test(function() {

  const path = document.getElementById('test1');

  const startPoint = path.getPointAtLength(0);

  assert_approx_equals(startPoint.x, 100, 0.1, "1e2 should equal 100");

  assert_approx_equals(startPoint.y, 100, 0.1, "1e2 should equal 100");

}, "Number parsing: 1e2 = 100");

test(function() {

  const path = document.getElementById('test1');

  const endPoint = path.getPointAtLength(path.getTotalLength());

  assert_approx_equals(endPoint.x, 200, 0.1, "2E2 should equal 200");

  assert_approx_equals(endPoint.y, 150, 0.1, "1.5e2 should equal 150");

}, "Number parsing: 2E2 = 200, 1.5e2 = 150");

test(function() {

  // Test positive exponent

  const svg = document.getElementById('svg');

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

  path.setAttribute('d', 'M 1e+2,2e+1');

  svg.appendChild(path);

  const point = path.getPointAtLength(0);

  assert_approx_equals(point.x, 100, 0.1, "1e+2 should equal 100");

  assert_approx_equals(point.y, 20, 0.1, "2e+1 should equal 20");

}, "Number parsing: Positive exponent (e+2)");

test(function() {

  // Test negative exponent

  const svg = document.getElementById('svg');

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

  path.setAttribute('d', 'M 1e-1,5e-2');

  svg.appendChild(path);

  const point = path.getPointAtLength(0);

  assert_approx_equals(point.x, 0.1, 0.001, "1e-1 should equal 0.1");

  assert_approx_equals(point.y, 0.05, 0.001, "5e-2 should equal 0.05");

}, "Number parsing: Negative exponent (e-1)");

test(function() {

  // Test case insensitivity

  const svg = document.getElementById('svg');

  const path1 = document.createElementNS('http://www.w3.org/2000/svg', 'path');

  path1.setAttribute('d', 'M 1e2,1e2');

  svg.appendChild(path1);

  const path2 = document.createElementNS('http://www.w3.org/2000/svg', 'path');

  path2.setAttribute('d', 'M 1E2,1E2');

  svg.appendChild(path2);

  const point1 = path1.getPointAtLength(0);

  const point2 = path2.getPointAtLength(0);

  assert_approx_equals(point1.x, point2.x, 0.001, "'e' and 'E' should be equivalent");

  assert_approx_equals(point1.y, point2.y, 0.001, "'e' and 'E' should be equivalent");

}, "Number parsing: 'e' and 'E' are case-insensitive");

test(function() {

  // Test fractional base with exponent

  const svg = document.getElementById('svg');

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

  path.setAttribute('d', 'M 1.5e2,2.5e1');

  svg.appendChild(path);

  const point = path.getPointAtLength(0);

  assert_approx_equals(point.x, 150, 0.1, "1.5e2 should equal 150");

  assert_approx_equals(point.y, 25, 0.1, "2.5e1 should equal 25");

}, "Number parsing: Fractional base with exponent (1.5e2)");

test(function() {

  // Test zero exponent

  const svg = document.getElementById('svg');

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

  path.setAttribute('d', 'M 5e0,10e0');

  svg.appendChild(path);

  const point = path.getPointAtLength(0);

  assert_approx_equals(point.x, 5, 0.001, "5e0 should equal 5");

  assert_approx_equals(point.y, 10, 0.001, "10e0 should equal 10");

}, "Number parsing: Zero exponent (5e0 = 5)");

test(function() {

  // Test consecutive exponent numbers

  const svg = document.getElementById('svg');

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

  path.setAttribute('d', 'M 1e2-1e2');

  svg.appendChild(path);

  const point = path.getPointAtLength(0);

  assert_approx_equals(point.x, 100, 0.1, "1e2 should equal 100");

  assert_approx_equals(point.y, -100, 0.1, "-1e2 should equal -100");

}, "Number parsing: Consecutive exponent numbers (1e2-1e2 = 100,-100)");

</script>

</body>

</html>