SVGGeometryElement: isPointInFill() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

The SVGGeometryElement.isPointInFill() method determines whether a given point is within the fill shape of an element. Normal hit testing rules apply; the value of the pointer-events property on the element determines whether a point is considered to be within the fill. The point argument is interpreted as a point in the local coordinate system of the element.

Syntax

js
isPointInFill(point)

Parameters

point

A DOMPointInit object interpreted as a point in the local coordinate system of the element.

Return value

A boolean indicating whether the given point is within the fill or not.

Examples

SVG

html
<svg
  viewBox="0 0 100 100"
  width="150"
  height="150"
  xmlns="http://www.w3.org/2000/svg">
  <circle
    id="circle"
    cx="50"
    cy="50"
    r="45"
    fill="white"
    stroke="black"
    stroke-width="10" />
</svg>

JavaScript

js
const svg = document.getElementsByTagName("svg")[0];
const circle = document.getElementById("circle");
const points = [
  ["10", "10"],
  ["40", "30"],
  ["70", "40"],
  ["15", "75"],
  ["83", "83"],
];

for (const point of points) {
  let isPointInFill;

  try {
    const pointObj = new DOMPoint(point[0], point[1]);
    isPointInFill = circle.isPointInFill(pointObj);
  } catch (e) {
    // Fallback for browsers that don't support DOMPoint as an argument
    const pointObj = svg.createSVGPoint();
    pointObj.x = point[0];
    pointObj.y = point[1];
    isPointInFill = circle.isPointInFill(pointObj);
  }

  console.log(`Point at ${point[0]},${point[1]}: ${isPointInFill}`);

  const pointEl = document.createElementNS(
    "http://www.w3.org/2000/svg",
    "circle",
  );
  pointEl.style.cx = point[0];
  pointEl.style.cy = point[1];
  pointEl.style.r = 5;
  pointEl.style.fill = isPointInFill ? "seagreen" : "rgb(255 0 0 / 50%)";
  svg.appendChild(pointEl);
}

Result

Specifications

Specification
Scalable Vector Graphics (SVG) 2
# __svg__SVGGeometryElement__isPointInFill

Browser compatibility

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