RGtk2: pangoMatrixTransformDistance – R documentation

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pangoMatrixTransformDistance

Description

Transforms the distance vector (dx,dy) by matrix. This is similar to pangoMatrixTransformPoint except that the translation components of the transformation are ignored. The calculation of the returned vector is as follows:

Usage

pangoMatrixTransformDistance(object, dx, dy)

Arguments

`object`	[`PangoMatrix`] a `PangoMatrix`, or `NULL`
`dx`	[numeric] in/out X component of a distance vector
`dy`	[numeric] yn/out Y component of a distance vector

Details

dx2 = dx1 * xx + dy1 * xy;
dy2 = dx1 * yx + dy1 * yy;

Affine transformations are position invariant, so the same vector always transforms to the same vector. If (x1,y1) transforms to (x2,y2) then (x1+dx1,y1+dy1) will transform to (x1+dx2,y1+dy2) for all values of x1 and x2. Since 1.16

Author(s)

Derived by RGtkGen from GTK+ documentation

RGtk2

R Bindings for Gtk 2.8.0 and Above

v2.20.36

GPL

Authors

Michael Lawrence <michafla@gene.com> and Duncan Temple Lang <duncan@wald.ucdavis.edu>

Initial release