void PlotManager::render(boost::function<void(DisplayState)> outputFunction)
{
// make sure the graphics path exists (may have been blown away
// by call to dev.off or other call to removeAllPlots)
Error error = graphicsPath_.ensureDirectory();
if (error)
{
Error graphicsError(errc::PlotFileError, error, ERROR_LOCATION);
logAndReportError(graphicsError, ERROR_LOCATION);
return;
}
// clear changes flag
setDisplayHasChanges(false);
// optional manipulator structure
json::Value plotManipulatorJson;
if (hasPlot()) // write image for active plot
{
// copy current contents of the display to the active plot files
Error error = activePlot().renderFromDisplay();
if (error)
{
// no such file error expected in the case of an invalid graphics
// context (because generation of the PNG would have failed)
bool pngNotFound = error.cause() && isPathNotFoundError(error.cause());
// only log if this wasn't png not found
if (!pngNotFound)
{
// for r code execution errors we just report them
if (r::isCodeExecutionError(error))
reportError(error);
else
logAndReportError(error, ERROR_LOCATION);
}
return;
}
// get manipulator
activePlot().manipulatorAsJson(&plotManipulatorJson);
}
else // write "empty" image
{
// create an empty file
FilePath emptyImageFilePath = graphicsPath_.complete(emptyImageFilename());
error = writeStringToFile(emptyImageFilePath, std::string());
if (error)
{
Error graphicsError(errc::PlotRenderingError, error, ERROR_LOCATION);
logAndReportError(graphicsError, ERROR_LOCATION);
return;
}
}
// call output function
DisplayState currentState(imageFilename(),
plotManipulatorJson,
r::session::graphics::device::getWidth(),
r::session::graphics::device::getHeight(),
activePlotIndex(),
plotCount());
outputFunction(currentState);
}