Transform and Rotate
Rotates an image by any angle.
🖼️ Image options and parameters of transformRotate method
transformRotate method rotates image anti-clockwise at any angle that user sets. It applies the same principle as transform method, but user only needs to pass a rotation angle as a parameter instead of the whole matrix.
Kinds of images compatible with algorithm
| Image property | What it means | Possible values |
|---|---|---|
bitDepth | number of bits per channel | [8,16] |
components | number of components | any |
alpha | is alpha channel allowed | true |
Parameters and its default values
-
angle -
options
Options
| Property | Required | Default value |
|---|---|---|
borderType | no | constant |
borderValue | no | 0 |
center | no | center |
fullImage | no | - |
height | no | - |
interpolationType | no | bilinear |
inverse | no | - |
scale | no | 1 |
width | no | - |
info
Technically, transform method can still be applied to rotate an image. However it is harder.
This means that ,to rotate an image by 90 degrees anti-clockwise, you can use transform method like this:
const center = image.getCoordinates('center');
return image.transform([
[0, 1, center.column - center.row],
[-1, 0, center.column + center.row],
]);
Or use transformRotate method like this:
return image.transformRotate(90);
transformRotate just facilitates this process.