VisPy Sinewave Demo

VisPy is quite an interesting tool.  They say it is for “scientific visualization”.  Here is an example of that.  I took a demo from their github page and added a little code to generate a sinewave.  The cool thing is that the graph, scaling, panning, zooming, and redrawing all come out of the box.

I previously wrote about installing VisPy.  Thanks to the great efforts of some unnamed people, Python on Windows is really working nicely now.

Here is a screenshot:


Here is the code:

Installing VisPy on Windows 10

VisPy is a Python library for interactive scientific visualization that is designed to be fast, scalable, and easy to use.

Here is how I installed it:

First I installed the latest Python 3.6 on Windows 10 by following the directions on  Once this was installed, I opened up Windows PowerShell and ran this command:

py -m pip upgrade vispy PyQt5 --user

I found some sample code here, and using NotePad++, copied and pasted it, saving it to Desktop\Code\

In PowerShell, I changed to the directory that I saved the python code to and ran it:

cd Desktop\Code
py .\

Here is the output:


It’s a pretty smooth and clean looking UI.  It seems extremely powerful, but I’ll need to dig in and see what makes it tick…

2D Sine Wave Example Using PyOpenGL

Here is an example of a moving 2D sine wave using Python 3, PyGame, and PyOpenGL.  See a  for how to install them.


This sample program is designed to have a 100×60 unit working area with a 10 unit buffer around the edges.  You can see the axis in the lower-left (0,0) where Y+ is up, and X+ is to the right.

The structure of the program was created to make it super easy to work on the “guts” of the graphics without getting it confused with the “bookkeeping” end of OpenGL or PyGame.

Note: the glOrtho() command is how 2D “parallel perspective” is setup.  It defines the left, right, bottom, top, near plane, and far plane.  Because it is parallel, there is not the notion of a “camera” per-se, but rather section of the plane that should be viewed.  Documented here:

Here is the code!

PyGame and OpenGL on Windows 10

First I went to and downloaded the latest version of Python for windows.  I made sure to select the option to add it to the system path.

Then I opened windows PowerShell (just a nicer term)

py -m pip install pygame --user
py -m pip install numpy --user
py -m pip install pyopengl --user

(I also installed NoteTab++, a nice text editor)

From there, I went to github and copied one of the examples from and saved it on my desktop as

In PowerShell, you just type:

cd Desktop
py -m myglcube

Here is my example:


(here is the code)



Problem with AJAX calls on PhoneGap project?

Using Adobe PhoneGap Build… ajax calls working fine in PhoneGap dev app, but not working once you build the app?  Getting 404 errors when the server is not even being hit?

After much searching, this is what fixed it:

Remove browser plugin (in this case did not need/want it)

phonegap platform remove browser

Add the whitelist plugin:

cordova plugin add cordova-plugin-whitelist

Credit here:

DMM Servos

Need advanced servo motors or drives for an upcoming project?  Building a CNC machine?  Just interested in learning a lot?



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One-Off Cast Iron

I had an incredible talk with Craft Pattern today, about making a custom cast iron machine frame.

They really took the time to talk me through the process and helped me understand the different techniques used.

Isn’t it great when you get to talk to someone who knows what they are talking about?

Have you considered cast iron as a possibility on any of your projects?  I hadn’t until recently, but now a whole new world of possibility has opened up.

In addition to casting, they offer full CNC machining services on the castings, so it sounds like a one-stop-shop.