cairoSurfaceSetDeviceOffset

[<code><a rd-options="" href="/link/CairoSurface?package=RGtk2&version=2.20.31" data-mini-rdoc="RGtk2::CairoSurface">CairoSurface</a></code>]  a <code><a rd-options="" href="/link/CairoSurface?package=RGtk2&version=2.20.31" data-mini-rdoc="RGtk2::CairoSurface">CairoSurface</a></code>

<code>surface</code>

[numeric]  the offset in the X direction, in device units

<code>x.offset</code>

[numeric]  the offset in the Y direction, in device units

<code>y.offset</code>

Sets an offset that is added to the device coordinates determined
by the CTM when drawing to <code>surface</code>. One use case for this function
is when we want to create a <code><a rd-options="" href="/link/CairoSurface?package=RGtk2&version=2.20.31" data-mini-rdoc="RGtk2::CairoSurface">CairoSurface</a></code> that redirects drawing
for a portion of an onscreen surface to an offscreen surface in a
way that is completely invisible to the user of the cairo
API. Setting a transformation via <code><a rd-options="" href="/link/cairoTranslate?package=RGtk2&version=2.20.31" data-mini-rdoc="RGtk2::cairoTranslate">cairoTranslate</a></code> isn't
sufficient to do this, since functions like
<code><a rd-options="" href="/link/cairoDeviceToUser?package=RGtk2&version=2.20.31" data-mini-rdoc="RGtk2::cairoDeviceToUser">cairoDeviceToUser</a></code> will expose the hidden offset.

internal

Facilities in the R language for programming
graphical interfaces using Gtk, the Gimp Tool Kit.

cairoSurfaceSetDeviceOffset: cairoSurfaceSetDeviceOffset

Description

Usage

Arguments

Details