HTML5 canvas provides methods that allow modifications directly to the transformation matrix. The transformation matrix must initially be the identity transform. It may then be adjusted using the transformation methods.
| S No. | Method and Description |
|---|---|
| 1 | transform(m11, m12, m21, m22, dx, dy) This method changes the transformation matrix to apply the matrix given by the arguments. |
| 2 | setTransform(m11, m12, m21, m22, dx, dy) This method changes the transformation matrix to the matrix given by the arguments. |
The transform(m11, m12, m21, m22, dx, dy) method must multiply the current transformation matrix with the matrix described by −
m11 m21 dx m12 m22 dy 0 0 1
To create a transformation matrix, use MathML.
Example
Following is a simple example which makes use of transform() and setTransform() methods:
<!Doctype html> <html> <head> <meta charset = "UTF-8"> <title>Pythagorean theorem</title> </head> <body> <math xmlns = "https://www.w3.org/1998/Math/MathML"> <mrow> <msup> <mi>a</mi> <mn>2</mn> </msup> <mo> + </mo> <msup> <mi>b</mi> <mn>2</mn> </msup> <mo> = </mo> <msup> <mi>c</mi> <mn>2</mn> </msup> </mrow> </math> </body> </html> <!doctype html> <html> <head> <meta charset = "UTF-8"> <title>Pythagorean theorem</title> </head> <body> <math xmlns = "https://www.w3.org/1998/Math/MathML"> <mrow> <msup> <mi>a</mi> <mn>2</mn> </msup> <mo> + </mo> <msup> <mi>b</mi> <mn>2</mn> </msup> <mo> = </mo> <msup> <mi>c</mi> <mn>2</mn> </msup> </mrow> </math> </body> </html>