I am trying to visualize text for concepts that are related by a graph. Many programs visualize text in relatively small, sparse circular nodes. This makes it difficult to view textual data. I would like to use a library that provides a visualization similar to the image below. What is the program or programming library that created this image?
This graph can be achieved using D3.js Hierarchical Tree Diagram. In particular, see:
D3 - Hierarchy:
https://github.com/d3/d3-hierarchy/blob/master/README.md
Tidy Tree:
https://observablehq.com/#d3/tidy-tree
Indented Tree:
https://observablehq.com/#d3/indented-tree
Related
Plotting packages offer a variety of methods for displaying data. Write an interactive plotting application for two dimensionsional curves. Your application should be able to allow the user to choose the mode (line strip or polyline display of the data, bar chart or pie charts), colours, and line styles.
You should start with the GUI editation like this:
Does anyone know of a low level (no frameworks) example of a drag & drop, re-order-able list?
and change it to your primitives (more points per primitive instead of one ... handle each point as (sub)object so you can change its position later).
Then just add tools like add object,del object,... For hand drawing tool use piece wise interpolation cubics
The grid can be done like this:
How to draw dynamic 2D grid that adjusts according to camera zoom: OpenGL
Mouse zooming/panning is also important
Zooming graphics based on current mouse position
Putting all above together into simple editor looks like this:
Using GPU for curve rendering might give you some nice speed and functionality boost:
Is it possible to express "t" variable from Cubic Bezier Curve equation?
Mouse selection of objects might be a speed problem if your scene contains too many objects so in such case its best to use index buffers where you can mouse select with pixel perfect precision for almost free in O(1):
OpenGL 3D-raypicking with high poly meshes
The example is for 3D , in 2D is much simpler ...
Also do not forget to implement save/load functionality to some vector file format. I recommend using SVG it might be complicated to start with it but you can quickly check it contents in any SVG viewer or browser also in notepad as its just a text file. If you use just basic path elements and ignore the rest of SVG features you will see the parsing and creating SVG is not that hard for example See these:
Get Vertices/Edges From BMP or SVG (C#)
Discrete probability distribution plot with given values
For really big datasets you might want to use spatial subdivision techniques (Bounding (Volume)Area Hierarchy, or Quad tree) to ease up the operations...
More in depth implementation details about 2D vector gfx editors depends on language, OS, gfx api and GUI api you using and task you are aiming for ...
Softwares like Catia, SolidWorks or the like all can visualize complex models while designing.
Exporting such models to raster triangle meshes yields huge files that later need to be greatly simplified to be imported into 3D engines like Unreal Engine or equivalent.
My question is: how do they visualize such complex geometries without rasterization? How do they do it that fast?
GPUs can only deal with triangles, therefore they tessellate geometry exactly as for STL export. Tessellation tolerance may vary from display to STL export affecting the time required to compute it.
Exporting such models to raster triangle meshes yields huge files
Not entirely correct. When you ask solidworks for the mesh you also provide quality that will influence number of triangles you receive - can be millions, can be just a dozen.
CAD packages operate with most bodies/shapes analytically - they have a formula. My guess is any other 3D engine does the same, the thing is format of the analytical data that different engines use is not the same. So you need to convert from one to another using triangles, format that everybody understands.
I need to find minimum spanning trees in a large graph using graph-viz. The number of nodes and edge information will be given in another text-file in 2 columns,"source" and "destination". please help.
Graphviz is principally a tool to layout graphs. The algorithms that are included relate to this task. The input for a graph is a graph specification.
What you need is a tool that computes the MST. There are several. The wikipedia article is a good start for references:
http://en.wikipedia.org/wiki/Prim's_algorithm
In python there is
http://pygraphviz.github.io/
In perl, I found
https://gist.github.com/hirotnk/780342
The SO answer here:
Graphviz Dot Algorithm
is also a good reference.
Given the output of an MST tool, you can general a file that is rendered by graphviz.
I have many 3D vectors. I want to plot them in a cube so that each dimension is on a particular side of the cube.
Now, I am looking for some visualization/tool or library that lets me rotate this cube in 3D and see the vectors in various different angles.
Thanks
Abhishek S
Try Processing, it is somewhat intended for data visualization and in addition to simple control over 3D drawing, it also has the full power of Java programming language. You can see numerous works, done by other people on OpenProcessing.
However, if you are into anything serious, I would suggest you to use some ohter IDE than the default one. I use Eclipse for that, importing Processing as a library into my project. It requires a tiny boilerplate to work, but then you're happy!
I usually like graphviz a lot for making graphs and trees and outputting them to pdf files. Right now I have a program that builds a tree with a large branching factor (up to 12, usually closer to 8 or 9). The problem is that graphviz cannot draw the tree more than two or three levels deep (and less if I use my fancy labels).
My train of thought is that this is a very simple graphic to generate. It's a very generic tree structure and no specialized placement algorithms are needed at all. I'm wondering if anybody knows of another software package that might get the job done. Here are the features I'm looking for:
Bare minimum:
Draws really wide trees with many vertices (perhaps a few million)
Outputs to pdf, postscript, svg, or some other common, portable graphics format
Good to have:
input format similar to graphviz
nodes that can be colored
html-style tables, similar to the awesome ones that graphviz has
Have you considered TikZ? http://www.texample.net/tikz/examples/tag/graphs/
I have not had to make graphs with millions of nodes, so I can't be sure this will work.
I originally suggested, in a comment, that graphviz provided facilities to produce multi-million node graphs. The rendering engine I was thinking of was sfdp, which is supplied as part of the graphviz package. An example is provided in the Graphviz gallery. As far as I am aware, this can be used with all the normal Graphviz output facilities.