Are there any beginner-friendly tutorials to display graphs in the way Knowledge graph has been done?
I have the data is JSON format presented from a graphdb
For eg:
The closest I have found so far is Gelphi. Which also can be integrated with unity to produce a 3d Graph like this one https://www.youtube.com/watch?v=h_arRCf73Kg.
Then there is https://cayley.io/
https://n0where.net/opengraphiti-data-visualization-engine/
There is also https://www.maana.io/knowledge-platform/platform-capabilities/#maana-knowledge-graph . However, i have not tried to use/download their platform.
https://en.wikipedia.org/wiki/Force-directed_graph_drawing
Finally, I am working myself on learning unity to build a simple GUI which a user can identify nodes and edges and entities easily and move them around. So instead of just reading from a data base, also write to it through a UI.
I have a lot of 2D, time-variant data (aka a movie) that I'd like to visualise inside a Qt interface. The idea is that the results can be viewed as a movie, browsed using a time-slider and then individual data points should be selectable to get more information about that point. (The data being shown is generated from simulations, and then converted to RGB through some colormap, so I'm not really looking for a component that plays mp4)
I have some experience using a QGraphicsScene, which makes it easy to get the cursor location & react to mouse events. But is it suitable for video? Or am I better off with some kind of QImage directly on a widget?
Ok, so it works well in PyQt, not so well in PySide.
I'm using a QPixmap wrapped in a QPixmapItem that gets added to the scene. To update the frame, I change the contents of the pixmap object and call update() on the scene.
Performance is good enough for video (although I don't need high frame rates for this project).
In PySide I ran into weird issues when I used more than 1 pixmap item, in PyQt it works just fine.
I'm trying to use to SketchUp API to navigate around 3D models (zoom, pan, rotate, etc). My ultimate aim is to integrate it with a Leap Motion app.
However, right now I think my first step would be to figure out how to control the basic navigation gestures via the Sketchup API. After a bit of research, I see that there are the 'Camera' and the 'Animation' interfaces, but I think they would be more suited to 'hardcoded' paths and motions within the script.
Therefore I was wondering - does anyone know how I can write a plugin that is able to accept inputs from another program (my eventual Leap Motion App in this case) and translate it into specific navigation commands using the Sketchup API (like pan, zoom, etc). Can this be done using the 'Camera' and the 'Animation' interfaces (in some sort of step increments), or are there other interfaces I should be looking at.
As usual, and examples would be most helpful.
Thanks!
View, Camera and the Animation class is what you are looking for. Maybe you don't even need the Animation class, you might just be ok with using the time in the UI class. Depends on the details of what you will be doing.
You can set the camera directly like so:
Sketchup.active_model.active_view.camera.set(ORIGIN, Z_AXIS, Y_AXIS)
or you can use View.camera= which also accept a transition time argument if you find that useful.
For bridging input you could always create a Ruby C Extension that takes care of the communication between the applications. There are some quirks in getting C Extensions work for SketchUp Ruby as oppose to regular Ruby though - depending on how you compile it.
I wrote a hello world example a couple of years ago: https://bitbucket.org/thomthom/sketchup-ruby-c-extension
Though note that I have since found a better solution for Windows, using the Development Kit from Ruby Installers: http://rubyinstaller.org/
This answer is related to my comment above regarding the view seemingly 'jumping' when I assign a new camera to the current view using camera=, but not if I use camera.set.
I figured out this was happening because the camera FOV for the original camera was different, and the new camera was defaulting to an FOV of 30. By explicitly creating the camera with the optional perspective and FOV arguments from the initial camera solves this problem:
new_camera = Sketchup::Camera.new new_eye, new_target, curr_camera.up, curr_camera.perspective?, curr_camera.fov
Hope people find this useful!
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i'm trying to desing a new application which allow user see he/her current location on a custom map (office, university compus, etc). but actually i have a couple of question in my mind (i haven't designed this kind of application before). i'm wondering:
How can i draw my own maps, what is the best option for it? there any format that i have to care of, there are any specification about it ?
Once i have my custom map. how can i do to mapping a global position system with the local positions ?
What are the tricks behing zoom on maps ? just differents layers with more or less informations and those layers changes on users demand ?
If a whant to mark some specific points over the map, like a cafeteria, boss's office etc, how can i do that ?
Sorry if my questions are too much generics and dumb, but i really need some clues about this topic because i don't have any idea how to design this kind of application as best as possible. and we don't whant to reinvent the wheel.
I will appreciate any help that you can provide me in order to desing this application
There are a number of approaches you can take to creating a maps application. Which one you use depends on the set of features you want to support, and the degree of control you want to maintain over the product.
If you want something like an embedded google map, then clearly the JavaScript Google Maps API may be best solution. If you need to support further features from the server side, like directions, you can make use of the web services api:
http://code.google.com/apis/maps/documentation/webservices/index.html
If, on the other hand, you essentially need a zoomable map of an area that you can define with markers and borders drawn from your database, and you want complete custom control over this image without having to rely on Google Maps' data or branding, then you can fairly easily build a scalable image either on the client or server, or both.
To start, you will need a set of point coordinates from which to draw your map. These can be derived from the SVG generated by a program like Adobe Illustrator when you draw vector graphics. Thus you could draw your own map in Illustrator and use the generated svg to create your map. In this case you will have to read about SVG and understand how to use it. Raphael.js is an excellent library that offers cross-browser compatible handling of SVG. If your map is of a familiar region, such as a country, you may be able to find SVG coordinates for it already on the web. You could start by grabbing a subset of the data in this file on wikipedia for the country or region you want to map.
Once you have a set of coordinates that define your map areas, you can keep them in a config file that can be read into memory from disk by your application as needed. It's convenient to save this data in the form of a hash, where each set of key-value pairs stores a separate svg 'path', or set of point coordinates that forms a closed shape. These could represent, for instance, the counties in a state.
Once you have the appropriate 'paths' stored in this manner, it is relatively easy to write a wide variety of software implementations.
Check out the imagemagick convert
documentation for the -draw
option for an example of how to
draw a png, jpeg, or gif on your
server from your stored svg paths.
Adam Hooper has some brilliant ideas of what to do with a custom map using SVG on the client side:
http://adamhooper.com/eng/articles/9
Note that you do not necessarily
need to use SVG. Here's an
example of a map drawn on the
server using ImageMagick, with a
highlightable clickmap drawn over it
by the browser, where the
highlighting is handled by the
jquery maphighlight plugin, which
uses the canvas element where it is
supported and VML in its place on
Internet Explorer browsers. All of
these layers (ImageMagick,
client-side click-map, and
client-side javascript highlighting)
are built with straight lines drawn
between point coordinates, so none
of this is actually SVG, and may be
easier to understand. Have a look
at the page source to see how the
click map is drawn, then look at the
maphighlight plugin to understand
what's going on:
http://davidlynch.org/js/maphilight/docs/
A third option, if you need to support more google-maps-like features, but want to add your own map data without using an overlay, is to implement some application of Open Street Maps. If you go to openstreetmap.org, find the area you want to customize, and click the edit tab at the top, you can edit the map as needed for your area. This edits the map data for all users of the Open Street Map service. Then you can get the openlayers javascript from http://openlayers.org/ to render a map on your website from Open Street Maps data that you can freely edit yourself. Also see the OpenStreetMap Wiki that tells you more about the OpenStreetMap movement.
If you don't want to reinvent the wheel, then don't try do do it: take the Google Maps API, add some markers and you're done. Zooming included. They have examples to guide you and there's loads of knowledge about the usage.
All you need is a free API key.
Edit: Your comment in the original question indicates that you want to use a custom overlay over existing maps. That's also possible as this example shows (see docs for custom overlays).
In the effort to not reinvent the wheel (which is definitely a good idea), much of the work of the maps themselves has already been done. The simplest approach will be to integrate Google Maps into your application. To address your individual points:
You don't have to draw your own maps. Tons of them already exist. Unless you're asking about drawing maps of indoor facilities yourself and plotting on those? In which case, how do you plan to approach this from a hardware perspective? GPS won't work well.
You need a piece of hardware that supplies the GPS coordinates. From there, you can just call the API to plot it.
Already done.
Calls to the API. Just provide the location (address, GPS, whatever you have) to the API. GPS will be more accurate, of course. But I'm pretty sure there's a geolocation service as part of the API and you can store the coordinates locally and adjust them manually if they're inaccurate.
If I'm off-base from your actual idea here, let me know. "Maps" is, of course, vague.
I want to visualize spring oscillations and hence need to create a visual of a spring- stretching and vibrations. I am working in Flash with need to demo oscilations based on user input. Typically, the springs are represented as a pencil sketch like below, and wanted to check if something more 3D and natural that can be built without much complexity(e.g would like stretch/ compression shows up on color of the spring body etc). Thanks again for and guidance/ pointers.
http://www.flashkit.com/movies/Scripting/Physics/Damped_o-Achyut_V-877 0/index.php