static void
set_scale(void* _context, float scale)
{
DrawingContext* context = reinterpret_cast<DrawingContext *>(_context);
context->CurrentState()->SetScale(scale);
context->ResyncDrawState();
// Update the drawing engine draw state, since some stuff
// (for example the pen size) needs to be recalculated.
}
static void
exit_state_change(void* _context)
{
DrawingContext* context = reinterpret_cast<DrawingContext *>(_context);
context->ResyncDrawState();
}