Graphviz Subgraph Layout Fabulous Omnigraffle Diagramming And

OmniGraffle is a diagramming and digital illustration application for Mac, iPhone, iPad and iPod touch created by The Omni Group. It allows users to convey ideas, organize thoughts visually, and communicate these thoughts and ideas to the world. I like Graphviz for making quick drawings that are minimalistic and take away the tweaking factor of a lot of apps. You describe the nodes and edges and Graphviz figures out how to handle the layout of the drawing. Awesome GraphViz. A curated list of GraphViz related resources. Low cost electric guitar to interface usb audio link cable for mac. These are some representative internal and external resources. The list includes tools that complement Graphviz, such as graph generators, postprocessors and interactive viewers. Graphviz is a great tool for creating quick diagrams. While it does not have a particularly polished WYSIWYG editor such as omnigraffle, it can automatically create diagrams from its simple markup language, DOT. After reading in the DOT markup, it uses various layout algorithms to automatically. For graph layout, tools worth looking at include OGDF (an open source C++ library), the commercial yFiles Java library with free yEd editor/layout tool (includes support for GraphML attributes), and Gephi (an open source Java-based graph layout/visualization tool).

Read I’m not a huge fan of UML. I think it took a simple idea (standard conceptual drawings) and made it much more complex than necessary with the unwise goal of allowing commercial UML tools to flourish and make code-to-diagram round trip conversion something people might want to do. Something like MagicDraw I find horrible from a performance and usability perspective. I’m also not a big fan of a lot of drawing software. Visio is great unless you don’t run on Windows, don’t own a copy, or care about usability. Omnigraffle on the Mac is arguably better on the usability front, but you still end up tweaking the drawing a lot more than just entering your relationships and drawing connections.

With any drawing software, the saved file is not human readable - and looking at diffs in a source control system tells you nothing I like Graphviz for making quick drawings that are minimalistic and take away the tweaking factor of a lot of apps. You describe the nodes and edges and Graphviz figures out how to handle the layout of the drawing.

Need to add something later? No problem, just put it in the dot file and regenerate your results. Graphviz has the advantages of: • Runs everywhere • Free • Text based - diff friendly changes • Supports a wide variety of output formats: bmp, eps, fig, gd, gd2, gif, gtk, ico, imap, cmapx, jpg, pdf, plain, png, ps, svg, tiff, vml, vrml, wbmp, webp, xlib Graphviz’s disadvantages: • Sometimes the layout is less than perfect • The output is pretty plain unless you spend a lot of adding style in the dot (which hurts the simplicity of the input format). Or spend time tweaking the output format (which gets you back into the image software trap) • Doesn’t support UML style graphics For a long time graphviz supported the inclusion of PostScript files to define shapes, but this was only useful if you were outputting PostScript as a final result.

I like using SVG as my format of choice since it can be freely scaled and works in most web browsers these days. Looking around the other day, I found a reference to the fact that Graphviz also supports the inclusion of SVG files as an image format. With a little experimentation, I found that it works pretty well. First, I created a series of UML images in SVG format for inclusion. The full set is in the GitHub project referenced below, but an example for a Component icon looks like this. Then you can create a file describing your Component Diagram which looks like this.

Dot -Tsvg -O sample.dot Results in an image that looks like this: Which is not too bad of a start. From here, there’s a few things I think I could do to make it even better. • Pre-process the dot file.

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Come up with an annotation to denote the type of image to include for a node without having to reference the image file. • Assign ids and classes as appropriate in the output which is handy for animating the resulting SVG or otherwise working with the SVG DOM later. • Post-process the SVG output to look nicer. Apply a better look to the sub-graphs, round the corners, add add gradients, etc. This sort of thing has been done before with XSLT. I think this approach is reasonable for some UML types: component, use case, collaboration, activity, and maybe deployment. Sequence diagrams are different in layout and probably aren’t worth the effort to attempt.

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Thank you all for the comments and suggestions. Most of the criticisms are quite fair: graph language improvements, modernization including default styles that aren't from 1980, bring Javascript interfaces like viz.js into the code base, coding multithreaded solvers, etc. Emden Gansner and I left AT&T a few years ago (in my case, it was AT&T's idea not mine) and we have not put a lot of work into the code lately. Emden's done a lot to move the website to gitlab.com that is about ready to go (instead of hosting the site in a VM on a 1.1Ghz Pentium or whatever we left in the rednet closet in AT&T.) We have a small backlog of algorithmic improvements.

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