Friday, May 10, 2013

Utah Teapot on Android

I am TOTALLY impressed with this code I found: It is the Utah Teapot that you can tilt it around with the accelerometer.

OpenGL is tricky. There are so many things to set up and do one thing wrong you get black screen. This Utah Teapot is classic data set for computer graphics. Just thinking about parsing the data already gives me a headache...

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I want to do something that sounds simple... set a camera at (10,10,10), looking at the origin... so I can plot a R2->R graph like z=x2+y2. I've done that years ago on Windows (which I "borrowed" some OpenGL code I found), yes, and I also borrowed code that parses an equation. This would probably be my last program not ported to Android.

Thursday, April 25, 2013

Math Experiments Revisited

I fixed my Math Experiments app to accommodate for larger screens. (This is long overdue) Nowadays Android phones are at least the size of the Nexus or the Samsung Galaxy. Also fixed a few issues. I also added the pen-and-pencil arithmetic methods from Visual Math Quiz in there. Why can a live teacher teach you math (and other subjects) better than you reading text alone? One reason is teachers can do visual demonstrations better than dead text. Also, need another example for adding fractions or solving a linear system of equations? just punch in different numbers. Dead text can't do that.

Get it on Google Play

Friday, April 12, 2013

Visual Math Quiz revisited

Fixed to display better for bigger phones... it seems Android phones are converging to one size: the size of the Samsung Galaxy III and Nexus. Added more config options: time per question, number of questions and which operations to quiz.

Get it on Google Play

The arithmetic demos were originally written in now-so-passe Java applets. It has evolved quite a bit.

Wednesday, March 13, 2013

Vocabulary List Revisited

I made several new features to Vocabulary List.

Now you can search your list, and import/export your list. Export is simply sending an email with pipe-delimited text. You can send your phone vocabulary list by gmail, with a subject "Vocabulary List - " followed by a list name. Call it "chapter 1" or "study words" or something. The content can be a list of words, or pipe-delimited vocabulary|definition.

For example:

ryu|japanese karate guy
ken|american karate guy
guile|the army guile
honda|the sumo guy
Get it on Google Play

Wednesday, January 16, 2013

Capture phone screenshot

This is a great omission that pre-4.0 Android phones do not have a screen-capture function. Fortunately there is a way to do this, if you have SDK tools installed: See here.

Screenshot can be captured with the ddms tool (Dalvik Debug Monitor).

Tuesday, January 8, 2013

Awesome blogger

This is an awesome Android blogger: Lots of useful examples and full source code. Thank you so much, Android-er.