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New pages: DOMMatrix multiply(), multiplySelf(), and preMultiplySelf() (
#37185) * New files: DOMMatrix.multiply() * typo * typo * forgot to save * new page: premultiplyself() * change examples * return values * return * Update index.md * Apply suggestions from code review Co-authored-by: wbamberg <[email protected]> * edits per review * Update files/en-us/web/api/dommatrix/multiplyself/index.md --------- Co-authored-by: wbamberg <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: "DOMMatrix: multiplySelf() method" | ||
| short-title: multiplySelf() | ||
| slug: Web/API/DOMMatrix/multiplySelf | ||
| page-type: web-api-instance-method | ||
| browser-compat: api.DOMMatrix.multiplySelf | ||
| --- | ||
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| {{APIRef("Geometry Interfaces")}}{{AvailableInWorkers}} | ||
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| The **`multiplySelf()`** method of the {{domxref("DOMMatrix")}} interface multiplies a matrix by the `otherMatrix` parameter, computing the dot product of the original matrix and the specified matrix: `A⋅B`. If no matrix is specified as the multiplier, the matrix is multiplied by a matrix in which every element is `0` _except_ the bottom-right corner and the element immediately above and to its left: `m33` and `m34`. These have the default value of `1`. | ||
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| To multiply a matrix without mutating it, see {{domxref("DOMMatrixReadOnly.multiply()")}}. | ||
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| ## Syntax | ||
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| ```js-nolint | ||
| DOMMatrix.multiplySelf() | ||
| DOMMatrix.multiplySelf(otherMatrix) | ||
| ``` | ||
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| ### Parameters | ||
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| - `otherMatrix` {{optional_inline}} | ||
| - : The [`DOMMatrix`](/en-US/docs/Web/API/DOMMatrix) multiplier. | ||
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| ### Return value | ||
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| Returns itself; the [`DOMMatrix`](/en-US/docs/Web/API/DOMMatrix) updated to the results of the applied multiplications. | ||
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| ## Examples | ||
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| ```js | ||
| const matrix = new DOMMatrix().rotate(30); | ||
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| console.log(matrix.toString()); | ||
| // output: matrix(0.866, 0.5, -0.5, 0.866, 0, 0) | ||
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| matrix.multiplySelf(matrix); | ||
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| console.log(matrix.toString()); | ||
| // output: matrix(0.5, 0.866, -0.866, 0.5, 0, 0) (a 60deg rotation) | ||
| ``` | ||
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| ## Specifications | ||
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| {{Specifications}} | ||
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| ## Browser compatibility | ||
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| {{Compat}} | ||
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| ## See also | ||
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| - {{domxref("DOMMatrixReadOnly.multiply()")}} | ||
| - {{domxref("DOMMatrix.preMultiplySelf()")}} | ||
| - CSS {{CSSxRef("transform-function/matrix", "matrix()")}} function | ||
| - CSS {{CSSxRef("transform-function/matrix3d", "matrix3d()")}} function |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,57 @@ | ||
| --- | ||
| title: "DOMMatrix: preMultiplySelf() method" | ||
| short-title: preMultiplySelf() | ||
| slug: Web/API/DOMMatrix/preMultiplySelf | ||
| page-type: web-api-instance-method | ||
| browser-compat: api.DOMMatrix.preMultiplySelf | ||
| --- | ||
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| {{APIRef("Geometry Interfaces")}}{{AvailableInWorkers}} | ||
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| The **`preMultiplySelf()`** method of the {{domxref("DOMMatrix")}} interface modifies the matrix by pre-multiplying it with the specified `DOMMatrix`. This is equivalent to the dot product `B⋅A`, where matrix `A` is the source matrix and `B` is the matrix given as an input to the method. If no matrix is specified as the multiplier, the matrix is multiplied by a matrix in which every element is `0` _except_ the bottom-right corner and the element immediately above and to its left: `m33` and `m34`. These have the default value of `1`. | ||
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| ## Syntax | ||
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| ```js-nolint | ||
| DOMMatrix.preMultiplySelf() | ||
| DOMMatrix.preMultiplySelf(otherMatrix) | ||
| ``` | ||
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| ### Parameters | ||
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| - `otherMatrix` {{optional_inline}} | ||
| - : The [`DOMMatrix`](/en-US/docs/Web/API/DOMMatrix) multiplier. | ||
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| ### Return value | ||
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| Returns itself; a [`DOMMatrix`](/en-US/docs/Web/API/DOMMatrix) updated to results of the applied multiplications. | ||
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| ## Examples | ||
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| ```js | ||
| const matrix = new DOMMatrix().translate(3, 22); | ||
| const otherMatrix = new DOMMatrix().translateSelf(15, 45); | ||
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| console.log(matrix.toString()); // output: matrix(1, 0, 0, 1, 3, 22) | ||
| console.log(otherMatrix.toString()); // output: matrix(1, 0, 0, 1, 15, 45) | ||
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| matrix.preMultiplySelf(otherMatrix); | ||
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| console.log(matrix.toString()); // output: matrix(1, 0, 0, 1, 18, 67) | ||
| console.log(otherMatrix.toString()); // output: matrix(1, 0, 0, 1, 15, 45) | ||
| ``` | ||
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| ## Specifications | ||
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| {{Specifications}} | ||
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| ## Browser compatibility | ||
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| {{Compat}} | ||
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| ## See also | ||
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| - {{domxref("DOMMatrix.multiplySelf()")}} | ||
| - {{domxref("DOMMatrixReadOnly.multiply()")}} | ||
| - CSS {{CSSxRef("transform-function/matrix", "matrix()")}} function | ||
| - CSS {{CSSxRef("transform-function/matrix3d", "matrix3d()")}} function |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| --- | ||
| title: "DOMMatrixReadOnly: multiply() method" | ||
| short-title: multiply() | ||
| slug: Web/API/DOMMatrixReadOnly/multiply | ||
| page-type: web-api-instance-method | ||
| browser-compat: api.DOMMatrixReadOnly.multiply | ||
| --- | ||
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| {{APIRef("Geometry Interfaces")}}{{AvailableInWorkers}} | ||
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| The **`multiply()`** method of the {{domxref("DOMMatrixReadOnly")}} interface creates and returns a new matrix which is the dot product of the matrix and the `otherMatrix` parameter. If `otherMatrix` is omitted, the matrix is multiplied by a matrix in which every element is `0` _except_ the bottom-right corner and the element immediately above and to its left: `m33` and `m34`. These have the default value of `1`. The original matrix is not modified. | ||
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| To mutate the matrix as you multiply it, see {{domxref("DOMMatrix.multiplySelf()")}}. | ||
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| ## Syntax | ||
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| ```js-nolint | ||
| DOMMatrixReadOnly.multiply() | ||
| DOMMatrixReadOnly.multiply(otherMatrix) | ||
| ``` | ||
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| ### Parameters | ||
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| - `otherMatrix` {{optional_inline}} | ||
| - : The [`DOMMatrix`](/en-US/docs/Web/API/DOMMatrix) multiplier. | ||
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| ### Return value | ||
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| A {{domxref("DOMMatrix")}}. | ||
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| ## Examples | ||
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| ```js | ||
| const matrix = new DOMMatrixReadOnly().translate(13, 21); | ||
| const multipliedMatrix = matrix.multiply(matrix); | ||
| console.log(matrix.toString()); // output: matrix(1, 0, 0, 1, 13, 21) | ||
| console.log(multipliedMatrix.toString()); // output: matrix(1, 0, 0, 1, 26, 42) | ||
| ``` | ||
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| ## Specifications | ||
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| {{Specifications}} | ||
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| ## Browser compatibility | ||
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| {{Compat}} | ||
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| ## See also | ||
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| - {{domxref("DOMMatrix.multiplySelf()")}} | ||
| - {{domxref("DOMMatrixReadOnly.preMultiply()")}} | ||
| - CSS {{CSSxRef("transform-function/matrix", "matrix()")}} function | ||
| - CSS {{CSSxRef("transform-function/matrix3d", "matrix3d()")}} function |