Error Plot::renderFromDisplay()
{
// we can use our cached representation if we don't need an update and our
// rendered size is the same as the current graphics device size
if ( !needsUpdate_ &&
(renderedSize() == graphicsDevice_.displaySize()) )
{
return Success();
}
// generate a new storage uuid
std::string storageUuid = core::system::generateUuid();
// generate snapshot and image files
Error error = graphicsDevice_.saveSnapshot(snapshotFilePath(storageUuid),
imageFilePath(storageUuid));
if (error)
return Error(errc::PlotRenderingError, error, ERROR_LOCATION);
// save rendered size
renderedSize_ = graphicsDevice_.displaySize();
// save manipulator (if any)
saveManipulator(storageUuid);
// delete existing files (if any)
Error removeError = removeFiles();
// update state
storageUuid_ = storageUuid;
needsUpdate_ = false;
// return error status
return removeError;
}
Error Plot::renderFromDisplaySnapshot(SEXP snapshot)
{
// generate a new storage uuid
std::string storageUuid = core::system::generateUuid();
// generate snapshot file
FilePath snapshotFile = snapshotFilePath(storageUuid);
Error error = r::exec::RFunction(".rs.saveGraphicsSnapshot",
snapshot,
snapshotFile.absolutePath()).call();
if (error)
return error ;
//
// we can't generate an image file by calling graphicsDevice_.saveAsImageFile
// because the GraphicsDevice has already moved on to the next page. this is
// OK though because we simply set needsUpdate_ = true below and the next
// time renderFromDisplay is called it will be rendered
//
// save rendered size
renderedSize_ = graphicsDevice_.displaySize();
// save manipulator (if any)
saveManipulator(storageUuid);
// delete existing files (if any)
Error removeError = removeFiles();
// update state
storageUuid_ = storageUuid;
needsUpdate_ = true;
// return error status
return removeError;
}
void Plot::saveManipulator() const
{
if (hasManipulator() && !storageUuid_.empty())
saveManipulator(storageUuid_);
}
