cairoMatrixRotate: cairoMatrixRotate
In RGtk2: R Bindings for Gtk 2.8.0 and Above

Applies rotation by radians to the transformation in matrix. The effect of the new transformation is to first rotate the coordinates by radians, then apply the original transformation to the coordinates.

1	cairoMatrixRotate(matrix, radians)

`matrix`	[`CairoMatrix`] a `CairoMatrix`
`radians`	[numeric] angle of rotation, in radians. The direction of rotation is defined such that positive angles rotate in the direction from the positive X axis toward the positive Y axis. With the default axis orientation of cairo, positive angles rotate in a clockwise direction.