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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/CanvasPattern/setTransform below:

CanvasPattern: setTransform() method - Web APIs

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The CanvasPattern.setTransform() method uses a DOMMatrix object as the pattern's transformation matrix and invokes it on the pattern.

matrix

A DOMMatrix to use as the pattern's transformation matrix.

None (undefined).

This is a code snippet which uses the setTransform method to create a CanvasPattern with the specified pattern transformation from a DOMMatrix. The pattern gets applied if you set it as the current fillStyle and gets drawn onto the canvas when using the fillRect() method, for example.

<canvas id="canvas"></canvas>

const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");

const matrix = new DOMMatrix([1, 0.2, 0.8, 1, 0, 0]);

const img = new Image();
img.src = "canvas_create_pattern.png";

img.onload = () => {
  const pattern = ctx.createPattern(img, "repeat");
  pattern.setTransform(matrix.rotate(-45).scale(1.5));
  ctx.fillStyle = pattern;
  ctx.fillRect(0, 0, 400, 400);
};

• The interface defining this method: CanvasPattern
• DOMMatrix

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