TweetFollow Us on Twitter

September 96 - Letters

LETTERS

NURB CURVES TYPO
I'm an M.S. student in the Department of Industrial Engineering at Bogazici University, Istanbul, Turkey. My thesis is about pattern recognition using implicit polynomials in CAD applications. While I was surfing the Internet, I found the article "NURB Curves: A Guide for the Uninitiated" in develop Issue 25 and read it. It's a very good resource for those (like me) with minimal knowledge of NURB curves and representations, and I liked it a lot.

But in Figure 20 there's a mistake, I think. Control point B (2) has coordinates {2, 0, 0}, but I believe the last index (w) should be 1. Is that right?
-- Ugur Murat Erdem

Yes, in fact you've found a typographical error in the figure you mention: B (2) should be {2, 0, 1}. We had a very good editor and several reviewers, but none of them caught this. I hope it doesn't mislead anyone too much. Thanks for pointing it out.
-- Philip Schneider

TECHNICAL Q&A: WHERE?
In the Issue 25 Macintosh Q&A, you explain a new method for embedding GX pictures into QuickDraw PICT files. It says that we can find sample code in the Macintosh Technical Q&A "Embedding a GX Picture into a PICT" (GX 07). Unfortunately, I haven't found this file on any developer CD I have. Could you please help me locate this information?
-- Michel Renon

That Q&A can be found on the Web at http://dev.info.apple.com/techqa/qdgx/gx07.html. In general, the Web site http://dev.info.apple.com/techqa/Main.html has the latest and greatest Macintosh Technical Q&As. They sometimes take a while to find their way to the CDs, and that was the case here. That Q&A is now available on the CDs as well. Sorry for any inconvenience.


-- Dave Johnson

TIME-SAVING TIPS
I really enjoyed Bob Johnson's Veteran Neophyte column in Issue 25 about ways to avoid wasting time. After programming the Mac for 10 years, I'm finally learning many of the things he talked about. It's funny looking back at all the mistakes I've made while thinking I was so smart.

I worked at Berkeley Systems on After Dark. One of the first things I did was write the Warp (or starfield) screen saver. I came up with a really cool assembly routine that, given an x and y, would draw the pixel on any monitor at any bit depth. It was a complicated routine (remember, I'm very smart) that used lots of shifts, multiplies, and divides. Even though I commented it, I still had to sit down and work through it each time I needed to make a change. Finally a coworker asked why I didn't just write a separate routine for each bit depth. I scoffed and said my routine was really cool. Needless to say, I rewrote it into separate routines; it was really easy, and is easy to maintain and change as well.

These days, instead of banging my head trying to come up with a "smart"; way to do things, I just code in the most straightforward way I know how. I'm finding that I have better things to do than screw around with a triply linked list that looked good in Dr. Dobbs but isn't really appropriate for my problem. I hate reliance on C-isms that aren't obvious: if you have to pull out the ANSI C book to figure it out, it isn't good code.

By the way, another good book is The Psychology of Computer Programming by Gerald M. Weinberg. It was written in 1971 but has some very interesting views on programming and programmers.
-- Bruce Burkhalter

I'm not a windsurfer, but I am a Mac developer, so I read Bo3b Johnson's column in Issue 25 with great interest. My boss (Markus Fest, the programmer of Toast CD-ROM Pro) told me it was a Pflichtlektüre (something you just gotta read). He was right.

There's a book that should have been in your Recommended Reading section: Code Complete by Steve McConnell (Microsoft Press, 1993). It's worth checking out. Enjoy!
-- Florian Dejako

It's amusing to look back and see how we learned the things we did, and how they' ve helped or hindered us. That introspection is actually what spawned the column: I realized that maybe others could avoid those mistakes if they read about them in advance.

To this day I run into arguments about using the full "power" of C/C++. I hate to see people writing code just to use some feature of C++ like operator overloading. If they can redirect that creative energy to figuring out a better algorithm, it's a total win.

I think restrictions can actually be liberating, by freeing you from having to think about everything. If the brace style in code were enforced, how many hours of wasted brain time would we get back? Having the meaningless stuff like brace style fixed in stone makes it easier to apply cleverness to the things that matter, like the quality of the software.

And Florian: thanks. I've never been called a Pflichtlektüre before, but I kinda like it.
-- Bo3b Johnson

TELL US WHAT YOU THINK (PLEASE) We welcome your letters to the editor, especially regarding articles published in develop. Write to Caroline Rose at crose@apple.com or, if technical develop-related questions, to Dave Johnson at dkj@apple.com. All letters should include your name and company name as well as your address and phone number. Letters may be excerpted or edited for clarity (or to make them say what we wish they did). Address subscription- related queries to order.adc@applelink.apple.com. *

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Default Folder X 5.1.6 - Enhances Open a...
Default Folder X attaches a toolbar to the right side of the Open and Save dialogs in any OS X-native application. The toolbar gives you fast access to various folders and commands. You just click on... Read more
Evernote 6.12.3 - Create searchable note...
Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at anytime, from... Read more
Geekbench 4.1.2 - Measure processor and...
Geekbench provides a comprehensive set of benchmarks engineered to quickly and accurately measure processor and memory performance. Designed to make benchmarks easy to run and easy to understand,... Read more
Carbon Copy Cloner 5.0.2 - Easy-to-use b...
Carbon Copy Cloner backups are better than ordinary backups. Suppose the unthinkable happens while you're under deadline to finish a project: your Mac is unresponsive and all you hear is an ominous,... Read more
BetterTouchTool 2.305 - Customize multi-...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
calibre 3.8.0 - Complete e-book library...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital librarian... Read more
BetterTouchTool 2.305 - Customize multi-...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
calibre 3.8.0 - Complete e-book library...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital librarian... Read more
Carbon Copy Cloner 5.0.2 - Easy-to-use b...
Carbon Copy Cloner backups are better than ordinary backups. Suppose the unthinkable happens while you're under deadline to finish a project: your Mac is unresponsive and all you hear is an ominous,... Read more
Evernote 6.12.3 - Create searchable note...
Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at anytime, from... Read more

The best new games we played this week -...
It's pretty much been one big release after another. We were privy to a bunch of surprises this week, with a lot of games we'd been waiting for quite some time dropping unexpectedly. We hope you're free this weekend, because there is a lot for... | Read more »
Stormbound: Kingdom Wars guide - how to...
Stormbound: Kingdom Wars is an excellent new RTS turned card battler out now on iOS and Android. Lovers of strategy will get a lot of enjoyment out of Stormbound's chess-like mechanics, and it's cardbased units are perfect for anyone who loves the... | Read more »
The best AR apps and games on iOS right...
iOS 11 has officially launched, and with it comes Apple's ARKit, a helpful framework that makes it easier than ever for developers to create mobile AR experiences. To celebrate the occassion, we're featuring some of the best AR apps and games on... | Read more »
Phoenix Wright: Ace Attorney - Spirit of...
Phoenix Wright: Ace Attorney - Spirit of Justice 1.00.00 Device: iOS Universal Category: Games Price: $.99, Version: 1.00.00 (iTunes) Description: ************************************************※IMPORTANT※・Please read the “When... | Read more »
Kpressor (Utilities)
Kpressor 1.0.0 Device: iOS Universal Category: Utilities Price: $4.99, Version: 1.0.0 (iTunes) Description: The ultimate ZIP compression application for iPhone and iPad. - Full integration of iOS 11 with support for multitasking.-... | Read more »
Find out how you can save £35 and win a...
Nothing raises excitement like a good competition, and we’re thrilled to announce our latest contest. We’ll be sending one lucky reader and a friend to the Summoners War World Arena Championship at Le Comedia in Paris on October 7th. It’s the... | Read more »
Another Lost Phone: Laura's Story...
Another Lost Phone: Laura's Story 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Another Lost Phone is a game about exploring the social life of a young woman whose phone you have just... | Read more »
The Witness (Games)
The Witness 1.0 Device: iOS Universal Category: Games Price: $9.99, Version: 1.0 (iTunes) Description: You wake up, alone, on a strange island full of puzzles that will challenge and surprise you. You don't remember who you are, and... | Read more »
Egg, Inc. guide - how to build your gold...
Egg, Inc.'s been around for some time now, but don't you believe for one second that this quirky clicker game has gone out of style. The game keeps popping up on Reddit and other community forums thanks to the outlandish gameplay (plus, the... | Read more »
The best deals on the App Store this wee...
Good news, everyone! Your favorite day of the week has arrived at last -- it's discount roundup day! This fine Wednesday evening we're gathering up the hottest deals on the App Store. We've got action platformers, we've got puzzle games, we've got... | Read more »

Price Scanner via MacPrices.net

Apple Offering Up To $455 Credit Toward iPhon...
iPhone 8 and 8 Plus are now available at the Apple Store, and you can receive up to $375 credit toward a new iPhone purchase when you trade in your eligible smartphone. Photo Courtesy Apple Just... Read more
AnyTrans Offers iOS Users Three Ways For Movi...
iMobie Inc. today announceed AnyTrans v6.0.1, which now can help iOS users move all data to iPhone 8/8 Plus seamlessly. The software is available both on Mac and Windows and fully able to move all... Read more
Snag a 13-inch 2.3GHz MacBook Pro for $100 of...
B&H Photo has 2017 13″ 2.3GHz MacBook Pros in stock today and on sale for $100 off MSRP, each including free shipping plus NY & NJ sales tax only: – 13-inch 2.3GHz/128GB Space Gray MacBook... Read more
Verizon offers new iPhone 8 for $100-$300 off...
Verizon is offering the new iPhone 8 for up to $300 off MSRP with an eligible trade-in: • $300 off: iPhone 6S/6S Plus/7/7 Plus, Google Pixel XL, LG G6, Moto Z2 Force, Samsung Galaxy S7/S7 edge/S8/S8... Read more
Apple Refurbished 2017 13-inch MacBook Pros a...
Apple has Certified Refurbished 2017 13″ Touch Bar MacBook Pros in stock today and available for $200-$300 off MSRP. A standard Apple one-year warranty is included with each MacBook, and shipping is... Read more
OWC USB-C Travel Dock with 5 Ports Connectivi...
OWC have announced the new OWC USB-C Travel Dock, the latest addition to their line of connectivity solutions. The USB-C Travel Dock lets you connect its integrated USB-C cable to a Mac or PC laptop... Read more
Pelican Products, Inc. Unveils Cases For All...
Pelican Products, Inc. has announced the launch of its full line of cases including Voyager, Adventurer, Protector, Ambassador, Interceptor (for the Apple iPhone 8 and 8 Plus backwards compatible... Read more
$100 off new 2017 13-inch MacBook Airs
B&H Photo has 2017 13″ MacBook Airs on sale today for $100 off MSRP including free shipping. B&H charges NY & NJ sales tax only: – 13″ 1.8GHz/128GB MacBook Air (MQD32LL/A): $899, $100 off... Read more
Apple restocks Certified Refurbished 13-inch...
Apple has Certified Refurbished 2015 13″ MacBook Airs available starting at $719 and 2016 models available starting at $809. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Is iPhone X Really The Future Of The Smartpho...
Should iPhone X even be called a telephone? It does of course support telephony and texting, but its main feature set is oriented to other things. It is also debatable whether it makes any rational... Read more

Jobs Board

Development Operations and Site Reliability E...
Development Operations and Site Reliability Engineer, Apple Payment Gateway Job Number: 57572631 Santa Clara Valley, California, United States Posted: Jul. 27, 2017 Read more
Specialist - Retail Customer Services and Sal...
The position listed below is not with Tennessee Interviews but with Apple , Inc. Tennessee Interviews is a private organization that works in collaboration with Read more
Specialist - Retail Customer Services and Sal...
The position listed below is not with South Carolina Interviews but with Apple , Inc. South Carolina Interviews is a private organization that works in collaboration Read more
Behavior Technician with *Apple* Consulting...
The position listed below is not with Washington Interviews but with APPLE CONSULTING Washington Interviews is a private organization that works in collaboration Read more
Infection Control RN with *Apple* Rehab - A...
The position listed below is not with Georgia Interviews but with Apple Rehab Georgia Interviews is a private organization that works in collaboration with Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.