Tag Archives: OmniGraffle

General

Writing...

I've been reading a couple of blog posts about other students' writing environments (both digital and physical) and the I've been really interested in the approaches they take when it comes to software selection but I've really been struggling to follow why they go to such extraordinary lengths to set up bespoke writing environment.  We have a few mathematicians associated with our course and they all swear by how LaTeX, for example, saves them days and days of typing equations and how they couldn't possibly write any of their materials without it.  But the part I'm really struggling to understand is that it was created about 40 or so years ago to overcome typesetting problems and surely there must be something more effective available now after all this time?

002:365 - My brain hurts...

Whilst I have a copy of Scrivener and I'm used to writing large batch files in Vi and ViM from my days using SPARC SunOS stations, I still choose to do most of my writing in Word.  It has an outlining tool which I find useful, but the deal sealer for me is that I can make it dance when it comes to large documents with regards automation.  Through simply using styles and captions, I can have a simply written and elegantly cross referenced document up and running in seconds.  Whilst scrivener is intended to get your ideas down on a page and get writing, I just don't feel that it's quite there for technical documents, as figures should be numbered and cross-referenced, as should equations and I'm far too lazy to do this myself and I've sort of gotten used to Word doing the donkey work for me for the past 20 years on these elements.

Admittedly the equation editor is dreadful in Word and is to type-setting what I am to men's ballet.  I've overcome this though by using MathType 6.7 which makes all of my equations look uniform and well typeset, with the added bonus of having numbering macros and scripts embedded into Word that allows me to automatically number equations and cross reference them in my writing.

Another boon for using MathType is that I can colour code equations, something that might sound trivial, but actually can be really useful in presentations to grey out parts of the equation that you're not interested in for the minute or for making critical terms bright red to make them pop out on the slide whilst you discuss them with the students.  I know you can do this too with LaTeX as that's the technique that I use for embedding equations in this blog, but I create the equations first in MathType and then after I've pasted them into here I simply edit a few colour tags.

To be clear, I'm not criticising anyone's writing setup, the key to writing is finding something that works for you.  But there does seem to be a trend on several social media sites to push for methods of writing that avoid mainstream packages.  I understand that money is tight nowadays and every penny counts, but I've managed to get myself a copy of MS Office and Mathtype together for about £60 all in, I'm sure that it can be done cheaper using something like LibreOffice that comes pre-installed with Ubuntu, but I take the view that £60 is less than an hour of my charge out rate when I was in industry and doing it this way will save me countless hours.

I do like peeking into other student's writing environments, both physical environments and their digital environments, but I'd love someone to explain to me why I should adopt LaTeX over Word and MathType, particularly given that I'll be embedding a lot of vector graphics from OmniGraffle and Visio and I'm really struggling to see how these other sorts of environments will help me write more efficiently, but then I guess it's horses for courses...

General Research Tutorial

Cable-Chains...

Part of the work that I've been undertaking on Mathematica is to create a series of sheets that will calculate the geometry of a cable-chain arch with a set of given parameters.  In part I’m interested in how the cable-chain arch can behave as a deployable structure and looking to build on the work of (Li, Vu, & Richard, 2011) to see how practical a cable-chain structure can be made with regards economy, efficiency, and robustness.  Essentially a cable-chain structure is a curved arch that is sub-divided into straight sections, with cables spanning across the base of two struts as can be seen in the figure below.  Simple versions of these types of structures are widely used for the likes of temporary and deployable aircraft hangers to create large open spans.

Pantographs

Now that I’ve got the makings of a simple Mathematica sheet up and running and I’ve taught myself some rudimentary programming and graphics manipulation skills I’ve managed to start to knock together what I feel are some high quality illustrations for my thesis.

I’ve done this with a mixture of Mathematica to create the base diagram, which I save as a PDF.  I then import the PDF into OmniGraffle to annotate the diagram and then export to a PNG file to maintain the transparent background, this figure I can then host for linking into blogs etc.  Below is a sample figure which shows how the number of segments (nSeg) affects the internal area available for habitation within a typical parabolic arch.

Cable Arches

Given that both of my brothers are colour blind and I’ve never done the test, I’m not convinced on my choice of colour schemes, but the good news is that it won’t take long to change if it turns out I’ve made my figures look like something off the set of Austin Powers.

So far I’m finding OmniGraffle quite limited compared to Visio that I’ve been using for my diagrams for perhaps 20 years or so.  I decided to use OmniGraffle though as most of my writing work is done on a Mac, although I also have a PC so I can always create the more complex diagrams on Visio if need be, especially as I’ve managed to get a legitimate copy from work for £12.

I'd love to hear how other engineers and academics approach creating technical figures and sketches on their Macs though, I've a feeling that I'm really missing out on something and there's got to be a much slicker workflow out there.

References:

Li, Y., Vu, K. K., & Richard, J. Y. (2011). Deployable Cable-Chain Structures: Morphology, Structural Response And Robustness Study. Journal for the International Association for Shell and Spatial Structures, 52(168), 83-96.