SVGPointList.initialize()

The initialize() method of the SVGPointList interface clears the list then adds a single new SVGPoint object to the list.

obj

An SVGPoint object containing the coordinates of the point to be added when the list is initialized.

The added SVGPoint object.

DOMException NoModificationAllowedError

Thrown if the list is read-only.

The following example shows an SVG which contains a <polyline> with five coordinate pairs. Returning SVGPointList.length gives the value 5. After calling initialize(), returning SVGPointList.length gives the value 1.

<svg id="svg" viewBox="-10 -10 120 120" xmlns="http://www.w3.org/2000/svg">
  <polyline id="example" stroke="black" fill="none"
   points="50,0 21,90 98,35 2,35 79,90"/>

let example = document.getElementById("example");
console.log(example.points.length) //5;
let svgpoint = document.getElementById("svg").createSVGPoint();
example.points.initialize(svgpoint);
console.log(example.points.length); //1