C. Keith Ray

C. Keith Ray is developing software for Sizeography and Upstart Technology. He writes code for multiple platforms and languages, including iOS® and Macintosh®.
Go to Sizeography and Upstart Technology to join our mailing lists and see more about our products. Keith's Résumé (pdf)

Friday, October 3, 2014

iPhone and iPad Models and Screen Resolutions

iPhone and iPad models and screen resolutions in the context of Apple's Xcode launch image xcassets view.


Tuesday, August 26, 2014

I and Me

If you're wondering whether to say "Bob and I" or "Bob and me," here's the trick: Take "Bob and" out of the sentence, correct the number implied by other words, if necessary, and judge whether the sentence sounds right.


Example 1: "Bob and I just want the best for you."

Drop Bob: "I just want the best for you."

The rewritten sentence sounds right, so "Bob and I" is correct in this example. The sentence should be, "Bob and I just want the best for you."


Example 2: "That award belongs to Bob and I."

Drop Bob: "That award belongs to I."

That doesn't sound right. So this example should be "That award belongs to Bob and me."

And you can test that again by changing "I" to "me" and leaving out Bob. "That award belongs to me." (But don't say that to Bob!)


Example 3: "We want to create the same experience you would have if you had called both Bob and I into your office for a meeting."

Drop Bob: "I want to create the same experience you would have if you had called I into your office  for a meeting."

That doesn't sound right. Let's try "me."  "I want to create the same experience you would have if you called me to your office  for a meeting." Better.

So, the better sentence is: "We want to create the same experience you would have if you had called both Bob and me into your office for a meeting."


That's it. Those of us who speak English as a native tongue, already know the unspoken rules of grammar; we just get confused when we try to follow the artificial rules we were taught in schools or by well-meaning friends.

Wednesday, August 13, 2014

Two Weird 'Tricks' For Testing Graphical Code

Before I do a bunch of "Extract Method" refactorings, I looked over the code and wrote this comment:

    // creates pdf context.
    // computes rowCount and columnCount from paper_size
    //    and major_grid_distance.
    // computes margin sizes (and thus origin.)
    // draws graph paper into context.
    // close context.
    -(void) drawMajorMinorGridAt: (CGPoint) origin
                     andRowCount: (int32_t) numberOfRows
                  andColumnCount: (int32_t) numberOfColumns

                       inContext: (CGContextRef) context;

What the extract methods will do, is let me draw while not in a pdf context. Code-reuse: yay!

Another way to achieve the same goal: copy & paste. While copy & paste may be quicker,  it bulks up the code and potentially doubles the number of defects that may "bug" us in the future. Technical debt.

One could argue that planning ahead would have created a better design. But... I didn't need to draw while not in a pdf context, a half-year ago.

One reason this code is so bad, is that I didn't exactly test-drive it. I ran some calculations, wrote the code, and looked at the output. In some early iterations, it produced grids with lines poking too far through other lines: I had to reduce the length of some lines, by the thickness of other lines. Similar glitches provoked a few other changes. And then it was done. I haven't touched the code in quite a while. 

Could I write some automated tests for this code? Yes. 

I could save some manually-verified pdf output as "Golden Data" and do file comparison in tests that are supposed to produce the same output. I have done something like this before. The only time the test failed in my project (without my changing code to cause the failure) was when a graphics library that my code depended on changed. 

So... few "false" failures. Drawbacks: slow tests, manual verification needed if the test fails. And manual intervention to re-create the "Golden Data" when the code is fixed or the failure is identified as not a bug. I also had to write a custom file-comparison routine in order to ignore parts of the file that change all the time (a time-stamp in the file itself.)

You do not want to do "Golden Data" test data when false failures are frequent. (Or any kind of manual intervention is frequent.)

Mocking. Yes, I could mock out the drawing code. It's a bit difficult because the drawing code below this Objective-C class consists of C functions. I would have to create a "seam" to allow compile-time, link-time, or run-time switching out of the drawing library. 

Mocking can create fragile tests. Since mocking works by verifying that the code-under-test executes an expected sequence of function-calls, and checks that the parameters passed into those functions have expected values, any change to the order of calls or the parameters passed in will cause the test to fail. This depends on how picky you configure the mock objects to be.

With some work, depending on the mocking framework, you could ignore the exact sequence of function calls, but still check that all of the calls have been made. Make the mocks too "loose" and then you're not testing anything. Make the mocks too strict, and you not only open yourself up to the possibility of frequent false failures, you also inhibit refactoring the drawing code.

There is also the danger that the functions you're avoiding calling will someday change their behavior, but the mock functions don't reflect that change. Instead of false test failures, you get false test successes. Some redundancy in testing helps avoid this problem: have some tests using mocks, have other tests using the real functions and some other form of verification, like Golden Data.)

Learn about Golden Data, mocks, and other xUnit Test Patterns here: xUnit Test Patterns: Refactoring Test Code



Test-drive safely, everyone!


Tuesday, August 12, 2014

When Your Brain Freezes Up

Some time ago, I was part of team for a trivia contest. There was no internet or computer access at that location, so no chance of cheating. I took the lead on some of the questions and got them wrong!

Why did that happen? I expected the questions to be hard. I expected the trivia questions to have non-obvious answers. It turned out that the obvious answers were the correct ones.

Go to this you-tube "video" (it's audio only) where a radio disk-jockey is posing a question to someone they randomly called. If the person they called gets the question right, they could win a motorcycle worth around $8,000 (US).



DJ: We've got to ask you a question before we put your name in the barrel. Spell AC/DC.
Mark: AD AC
DJ: I'm going to ask you again.
Mark: Hang on.
DJ: How do you spell AC/DC?
Mark: A… D… A… C
There's some overlapping dialog, and we hear Mark say "ACDC" in that noise. But his answer when asked a third time is still ADAC, until they call him an idiot and tell him it's AC/DC!

It could be this guy had other issues, but under stress, our body is preparing for flight or fight. The neocortex is only a recent invention. "Flight or fight" has been around for billions of years.


Friday, July 18, 2014

Function Pointer Syntax Cheat-Sheet-By-Example

#include <stdio.h>

// Using * to indicate the parameter is a pointer to a function.

void functionTakingFunctionPointerOldStyle(int (*pf)(int))
{
    printf("\nold style pf = %p\n", pf);
    if (pf != NULL)
    {
        int x = (*pf)(12); // Using * to deref function pointer.
        printf("pf(12) = %d\n", x);
    }
}

// We don't need * to indicate that a parameter is a function pointer.

void functionTakingFunctionPointerNewStyle(int pf(int))
{
    printf("\nnew style pf = %p\n", pf);
    if (pf != NULL)
    {
        int x = pf(12); // Don't need * to deref function pointer, either.
        printf("pf(12) = %d\n", x);
    }
}

// Blocks. Like old-style function pointer, using ^ instead of *.

void functionTakingBlock(int (^pf)(int)) // like old-style function pointer.
{
    printf("\nblock pf = %p\n", pf);
    if (pf != NULL)
    {
        int x = pf(12); // Same syntax as calling function or function-pointer.
        printf("pf(12) = %d\n", x);
    }
}

/*

If we use a typedef, then the syntax for parameter declaration is simple:

     typedef int (*funcPtr)(int);

     void functionTakingFunctionPointer(funcPtr fp);

 But now we need to remember how to declare the function-pointer typedef!

 This is how I create a typedef for a function pointer type:

 1. Start with the function declaration itself.

     int functionTakingIntReturningInt(int i);

 2. Remove parameter names.

     int functionTakingIntReturningInt(int);

 3. Change the function name to a name appropriate for this function-pointer type, maybe suffixed with "FuncPtr" if you can't think of something more meaningful. Don't suffix "Type" to the name—like "FuncPtrType"—it makes you look like a newby. (I stopped doing that last week.)

     int funcPtr(int);

 4. Wrap name with (* and )

     int (*funcPtr)(int);

 5. Add typedef

     typedef int (*funcPtr)(int);

 6. Profit!

*/

int functionTakingIntReturningInt(int i)
{
    return i + 1;
}

int main(int argc, char *argv[]) 
{
    // "old" style C code - using "&" take address of the function.
    functionTakingFunctionPointerOldStyle( NULL );
    functionTakingFunctionPointerOldStyle( & FuncionTakingIntReturningInt );

    // "new" style C code - don't need "&" for function type.
    functionTakingFunctionPointerNewStyle( NULL );
    functionTakingFunctionPointerNewStyle( FuncionTakingIntReturningInt );

    // blocks
    functionTakingBlock( NULL );
    functionTakingBlock( ^(int i){ return i + 1; } );
}


Output:


old style pf = 0x0

old style pf = 0x1004aa980
pf(12) = 13

new style pf = 0x0

new style pf = 0x1004aa980
pf(12) = 13

block pf = 0x0

block pf = 0x1004ab0f0
pf(12) = 13



Wednesday, April 30, 2014

myGraph 1.0.3 is Now Available on the Apple Store

myGraph 1.0.3 is Now Available on the Apple Store

myGraph lets you design fully-customizable graph paper, save it, share it, and print it on any AirPrint™-enabled printer. You have your choice of unlimited colors, line widths, and line spacing, so you can always have graph paper perfectly designed to your specific needs.

myGraph is perfect for interior designers or landscape designers, crafters, engineers, students, teachers, and more.

In myGraph you may select from predefined graph-papers or create your own. You may choose from an unlimited spectrum of colors. And, set grid spacing in fractions or decimals, in English or metric units.

Your graph-paper’s line-width and primary and alternate colors are under your full control. Want green instead of blue? Thick lines or thin? You can make it so!

Printing requires a printer supporting AirPrint™. You can share myGraph’s graph-paper through email, DropBox and other apps on your iPhone or iPad. Import myGraph’s graph-paper into painting or drawing programs.

Supports standard paper sizes for US and metric printers.


What's New in myGraph version: 1.0.3:


  • Fix issue with scrolling in the information view. It wasn't allowing the user to scroll to the end of the text. Now, it allows scrolling.
  • Performs faster.
  • Fixed memory leaks.

View in iTunes

Download myGraph in the App Store

Tuesday, April 22, 2014

myGraph 1.0.3 Beta Testing

Would you like to beta test for the iOS app myGraph by Sizeography™?

myGraph lets you design and print grids or graph paper, and save your designs so you can print them again. Create or select a grid, choose the color, spacing, and line-width of the grid, and optionally specify an alternate color and line-width for accent lines. Then you can print, share, or open a grid in another iOS app on your device.

PS: While we are trying to be as careful as possible, there are risks in running beta software on your iOS device. While we have not seen any problems other than myGraph freezing up or crashing, there is always a risk of data loss. Please be careful to backup your iDevice before testing.

If you decide to help us test, please try the following after you get the beta app installed:


  1. Try creating different designs of graph paper -- choosing colors, spacing, line-width and so on. If you really like a grid or graph paper that you designed, you can note the settings that you used to create that design and send me the notes and the pdf output for that design -- and I could feature that on our website, with a link to your homepage, if you so desire.
  2. Please try all the features that you can see. Check out the Help text and see if it makes sense. If you experience a hang or crash, please report the steps that you took to get that to happen. You can make screen-captures and send those to me.
  3. myGraph supports "Open In..." and "Share..." as well as "Print...". One of the "Open In..." choices is eMail, so go ahead and send me ONE email as part of your testing.


To sign up for testing CLICK HERE!

(Sizeography™ is a division of Upstart Technology™, CEO Cynthia Wunsch, CTO Keith Ray.)

Wednesday, April 2, 2014

Links

http://feedly.com/e/-sUatCMU birth of the light-saber


http://feeds.boingboing.net/~r/boingboing/iBag/~3/_6-Tz9H199E/story01.htm Rigged stock-trading? Also see Daily Show interview




http://feedproxy.google.com/~r/failblog/~3/er2CdGTxGdA/8130370560 Snakes in toilets -- we need devices to keep them out -- (kickstarter, anyone?) 








quotes:

"So I went back to Things, a program that’s so simple, it doesn’t have a manual. (It’s also Mac only; sorry.) I had the basics down in under two minutes. You click on the Projects button and give the project a name–You Again, Kitchen, Chores, Car, whatever. Under that you click on the Add button and you get a line in your To List so you can break down the job into small parts: Synopsis, Hang Shelf, Wash Dishes, Call Toyoto, whatever. 

"Then you assign a due date for each To Do. That’s it. It does other things–you can assign tags and add notes, etc.–but it does the one thing I need–generate daily to-do lists–and it does it really well."  

"My first to do lists weren’t broken down into small enough tasks, so I’d look at my list for a day and realized it would take forty hours to do what I’d scheduled in twelve. Back to revising the lists, stretching out the time periods for getting things done, making the tasks smaller. My second to-do lists were much better, until I realized that scheduling sixteen-hour work days wasn’t a good idea, either. I can do that for one or two, even three days, but week after week? No. So I went back in and reassigned due dates again, which is easy to do in the program."


Quote: 

"As the day of our first release planning event grew closer, I noticed that there were some blank faces among my extended leadership team when I referred to various aspects of what we needed to do. My heart sank as I asked the team, “Who has read the book?“. A couple of hands were raised. “Who has finished the book?“. Only one hand (and yes he still works with me!). “Who doesn’t own the book?“. At least four or five hands were sheepishly raised. “OK” I said “Change of plan. We are all going to buy the book. If you cannot afford the book, let me know and I will arrange a book for you. Then we are going to read the book together. We are going to form a book club!” As Deming said, “without theory there is no learning”. 
"For the next 3 months I met with my extended leadership team for an hour a week. Each week one member of the team lead a discussion on a chapter or two. We would discuss the concepts covered, how they might apply to our situation and agreed on the ideas we wanted to implement. Book club was compulsory and if one team member had something more important to do then book club was rescheduled. Shared understating and agreement was paramount if we were going to be successful. 
"Visitors to the EDW Release Train are often shocked when they hear that I called a mandatory weekly meeting to read a book. I am always quick to remind them that no one would hesitate to call a “business” meeting, so why wouldn’t we want to make time for a meeting focused on learning ways to improve our “business”."



Quote 
"If you buy an ebook from anyone other than Amazon, you’re buying an EPUB file. Apple and Google, in particular, have aggressively supported EPUB 3 in their iBooks and Google Play stores. As an ebook author, iBooks and the Google Play reader are a dream come true: I can write the book, style it as I please with modern CSS, and be confident that readers will see the text as I intended. 
"For sales on the Kindle Store, I need to generate a KF8 with kindlegen. I have to painstakingly craft my EPUB files so as not to conflict with the limitations in Amazon’s undocumented subset of EPUB3."

http://feedly.com/k/19JcS1I "quartoOpen source ebook formatter (under development) 


Quote 
"Fear of success, just like fear of failure, can paralyze you. Can you find a way to create an experiment that will allow you to succeed, in one small way? Then, use the results to learn from that experiment? 
"If you have the growth mindset, it’s not about you as a boxed-in person. It’s about you as an experiment. You build your emotional resilience and your experiences to help you along the way."


Monday, March 31, 2014

Link Blogging

http://www.niemanlab.org/2014/03/whats-new-in-digital-and-social-media-research-how-editors-see-the-news-differently-from-readers-and-the-limits-of-filter-bubbles/ “Shares, Pins, and Tweets: News Readership From Daily Papers to Social Media”: From Duke University, published in Journalism Studies. By Marco Toledo Bastos. "Social media users tend to favor hard news over soft news, especially on Twitter." "news items about arts, science, technology, and opinion pieces, which are on average more frequent on social networking sites than on newspapers.“The Structural Virality of Online Diffusion,”  "analyze a billion links [...] shared on Twitter. One of out every 3,000 links produced a “large event,” or a sharing phenomenon that reached 100 additional persons [...] truly viral events (many multiple generations of sharing, several thousand adoptions at least) occurred only about once in a million instances."

http://www.vox.com/charles-kenny/#b03g31t20w14 How is the world getting better? Ezra: When I read some of the American decline literature [...] Charles: I think that we’re running out of "others" in a really positive way. We’re not allowed to discriminate against many people we used to discriminate against and so who are we going to have as the threat? Maybe what we’re left with is China. I hope we discover Martians because China is a really bad other. We really need to be cooperating with China. Treating them as a threat is going to be really counterproductive to our own quality of life.

http://proseand.co.nz/2014/02/17/type-programming-shifting-from-values-to-types/ Type programming: Shifting from values to types by Joe Barnes "I need to understand a lot more about the type system in Scala. So as of this morning, I have decided it is time for me to actually learn type programming in Scala [...] I find that all of the resources out there thrust the reader so quickly into the deeper areas of the pool, that reading them is akin to flailing for my life until the lifeguard rescues me and the only lesson I’ve learned is how to not die while in the pool. In this post, I will gently break us into type programming in the kiddie pool."

Link Blogging

http://feeds.boingboing.net/~r/boingboing/iBag/~3/l6Rl-x22u3c/story01.htm "developers who worked on Ultima Online [...] are creating a game called Shards Online over which players will have enormous control. Players will be able to run their own servers, change the code that the game runs on, and add their own challenges. The internal logic of this is a game set in a multiverse[...]"

http://feeds.boingboing.net/~r/boingboing/iBag/~3/yVN83zKFBA4/story01.htm "re-re-launched Amazing Stories, the very first science fiction magazine, founded 88 years ago by Hugo Gernsback. Through the month of April, they'll publish fiction and features, which will be collected as an ezine at the end of the month."

http://matociquala.tumblr.com/post/81284926274/everythingsbetterwithbisexuals-lucymontero "Mary Bowser, former slave of the Van Lew family, infiltrated [...] the household of Jefferson Davis. Bowser was assumed to be illiterate, and as a black woman was below suspicion. Practically invisible, she was able to listen to conversations between Confederate officials and read sensitive documents, gathering information that she handed over to the Union. (From National Woman’s History Museum Facebook Page)"

funny http://cheezburger.com/8129159936?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+SetPhasersToLol+%28Set+Phasers+To+LoL%29 "It's a Love/Rob Situation..." "He used to rob me three times a week, now I'm lucky if I get it once a month..."


Link Blogging

http://www.neat.io/blog/app-developer-vs-seo.html "[three pages] shared the same common template and content." "these three pages (the most important pages to rank for due to their specificity), were not being ranked very highly on Google. Turns out search engines don't like duplicate content and heavily penalise your site for it" "Links which are in bold are also given more weight so each link to a service page is wrapped in strong tags" "Understanding how search engines crawl pages and how they interpret the semantic structure of your pages was eye-opening."

Two "Magnificent Seven" blogs today:

  1.  http://feeds.boingboing.net/~r/boingboing/iBag/~3/iFXG2dI8ueA/story01.htm "Podcast: Collective Action - the Magnificent Seven anti-troll business-model" "The reason the victims [of patent trolls] don’t get together to fight back is that they don’t know each other and have no way to coordinate among each other. In economists’ jargon, they have a ‘‘collective action problem.’’"
  2.  http://agiletng.org/2014/03/21/the-seven-samurai/ "A pattern language for enterprise agile transformation" "Continuous Assessment: Motivate Agile in terms of bottom line metrics." etc.
http://boingboing.net/2014/03/31/google-maps-spam-problem-pre.html "Google Maps' spam problem presents genuine security issues" "a Microsoft Engineer demonstrated an attack against Google Maps through which he was able to set up fake Secret Service offices in the company's geo-database, complete with fake phone numbers that rang a switch under his control and then were forwarded to real Secret Service offices, allowing him to intercept and record phone-calls made to the Secret Service" "this is a higher-stakes version of a common spam-attack on Google Maps practiced by locksmith, carpet cleaning, and home repair services" "Google’s basically getting a not insignificant amount of their income from scammers—if you look at locksmiths, 99 percent of them are scammers,” says Austin"



Repels the Cable-Chewing Cat

American Terminal SL250-100 1/4-Inch Split Loom Tubing, 100 feet "One of my cats likes to chew on cables -- particularly expensive ones belonging to Apple products. I've used this product to cover many of my cables, starting at least a year ago, and I haven't seen any evidence that my cat has chewed on them. So, I guess they work!"

Getting this tubing over the cables isn't easy, but you only have to do it once (per cable)."