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

Duplicate Annihilator 5.7.5 - Find and d...
Duplicate Annihilator takes on the time-consuming task of comparing the images in your iPhoto library using effective algorithms to make sure that no duplicate escapes. Duplicate Annihilator... Read more
BusyContacts 1.0.2 - Fast, efficient con...
BusyContacts is a contact manager for OS X that makes creating, finding, and managing contacts faster and more efficient. It brings to contact management the same power, flexibility, and sharing... Read more
Capture One Pro 8.2.0.82 - RAW workflow...
Capture One Pro 8 is a professional RAW converter offering you ultimate image quality with accurate colors and incredible detail from more than 300 high-end cameras -- straight out of the box. It... Read more
Backblaze 4.0.0.872 - Online backup serv...
Backblaze is an online backup service designed from the ground-up for the Mac.With unlimited storage available for $5 per month, as well as a free 15-day trial, peace of mind is within reach with... Read more
Little Snitch 3.5.2 - Alerts you about o...
Little Snitch gives you control over your private outgoing data. Track background activity As soon as your computer connects to the Internet, applications often have permission to send any... Read more
Monolingual 1.6.4 - Remove unwanted OS X...
Monolingual is a program for removing unnecesary language resources from OS X, in order to reclaim several hundred megabytes of disk space. If you use your computer in only one (human) language, you... Read more
CleanApp 5.0 - Application deinstaller a...
CleanApp is an application deinstaller and archiver.... Your hard drive gets fuller day by day, but do you know why? CleanApp 5 provides you with insights how to reclaim disk space. There are... Read more
Fantastical 2.0 - Create calendar events...
Fantastical is the Mac calendar you'll actually enjoy using. Creating an event with Fantastical is quick, easy, and fun: Open Fantastical with a single click or keystroke Type in your event details... Read more
Cocktail 8.2 - General maintenance and o...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
Direct Mail 4.0.4 - Create and send grea...
Direct Mail is an easy-to-use, fully-featured email marketing app purpose-built for OS X. It lets you create and send great looking email campaigns. Start your newsletter by selecting from a gallery... Read more

These are All the Apple Watch Apps and G...
The Apple Watch is less than a month from hitting store shelves, and once you get your hands on it you're probably going to want some apps and games to install. Fear not! We've compiled a list of all the Apple Watch apps and games we've been able to... | Read more »
Appy to Have Known You - Lee Hamlet Look...
Being at 148Apps these past 2 years has been an awesome experience that has taught me a great deal, and working with such a great team has been a privilege. Thank you to Rob Rich, and to both Rob LeFebvre and Jeff Scott before him, for helping me... | Read more »
Hands-On With Allstar Heroes - A Promisi...
Let’s get this out of the way quickly. Allstar Heroes looks a lot like a certain other recent action RPG release, but it turns out that while it’s not yet available here, Allstar Heroes has been around for much longer than that other title. Now that... | Read more »
Macho Man and Steve Austin Join the Rank...
WWE Immortals, by Warner Bros. Interactive Entertainment and WWE, has gotten a superstar update. You'll now have access to Macho Man Randy Savage and Steve Austin. Both characters have two different versions: Macho Man Randy Savage Renegade or Macho... | Read more »
Fearless Fantasy is Fantastic for the iF...
I actually had my first look at Fearless Fantasy last year at E3, but it was on a PC so there wasn't much for me to talk about. But now that I've been able to play with a pre-release version of the iOS build, there's quite a bit for me to talk... | Read more »
MLB Manager 2015 (Games)
MLB Manager 2015 5.0.14 Device: iOS Universal Category: Games Price: $4.99, Version: 5.0.14 (iTunes) Description: Guide your favorite MLB franchise to glory! MLB Manager 2015, officially licensed by MLB.com and based on the award-... | Read more »
Breath of Light (Games)
Breath of Light 1.0.1421 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0.1421 (iTunes) Description: Hold a quiet moment. Breath of Light is a meditative and beautiful puzzle game with a hypnotic soundtrack by... | Read more »
WWE WrestleMania Tags into the App Store
Are You ready to rumble? The official WWE WrestleMania app, by World Wrestling Entertainment, is now available. Now you can get all your WrestleMania info in one place before anyone else. The app offers details on superstar signings, interactive... | Read more »
Bio Inc's New Expansion is Infectin...
Bio Inc., by DryGin Studios, is the real time strategy game where you infect a human body with the worst virus your evil brain can design. Recently, the game was updated to add a whole lot of new features. Now you can play the new “Lethal”... | Read more »
The Monocular Minion is Here! Despicable...
Despicable Me: Minion Rush, by Gameloft, is introducing a new runner to the mix in their latest update. Now you can play as Carl, the prankster minion. Carl has a few new abilities to play with, including running at a higher speed from the start.... | Read more »

Price Scanner via MacPrices.net

13-inch 2.5GHz MacBook Pro (refurbished) avai...
The Apple Store has Apple Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.... Read more
Save up to $80 on iPad Air 2s, NY tax only, f...
 B&H Photo has iPad Air 2s on sale for $80 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469.99 $30 off - 64GB iPad Air 2 WiFi: $549.99 $50 off - 128GB iPad... Read more
iMacs on sale for up to $205 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $1019 $80 off - 21″ 2.7GHz iMac: $1189 $110 off - 21″ 2.9GHz... Read more
Färbe Technik Offers iPhone Battery Charge LI...
Färbe Technik, which manufactures and markets of mobile accessories for Apple, Blackberry and Samsung mobile devices, is offering tips on how to keep your iPhone charged while in the field: •... Read more
Electronic Recyclers International CEO Urges...
Citing a recent story on CNBC about concerns some security professionals have about the forthcoming Apple Watch, John Shegerian, Chairman and CEO of Electronic Recyclers International (ERI), the... Read more
Save up to $380 with Apple refurbished iMacs
The Apple Store has Apple Certified Refurbished iMacs available for up to $380 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 27″ 3.5GHz 5K iMac – $2119 $... Read more
Mac minis on sale for up to $75 off, starting...
MacMall has Mac minis on sale for up to $75 off MSRP including free shipping. Their prices are the lowest available for these models from any reseller: - 1.4GHz Mac mini: $459.99 $40 off - 2.6GHz Mac... Read more
College Student Deals: Additional $50 off Mac...
Take an additional $50 off all MacBooks and iMacs at Best Buy Online with their College Students Deals Savings, valid through April 11, 2015. Anyone with a valid .EDU email address can take advantage... Read more
Mac Pros on sale for up to $260 off MSRP
B&H Photo has Mac Pros on sale for up to $260 off MSRP. Shipping is free, and B&H charges sales tax in NY only: - 3.7GHz 4-core Mac Pro: $2799, $200 off MSRP - 3.5GHz 6-core Mac Pro: $3719.99... Read more
13-inch 2.5GHz MacBook Pro on sale for $100 o...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $999 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Read more

Jobs Board

DevOps Software Engineer - *Apple* Pay, iOS...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Sr. Technical Services Consultant, *Apple*...
**Job Summary** Apple Professional Services (APS) has an opening for a senior technical position that contributes to Apple 's efforts for strategic and transactional Read more
Lead *Apple* Solutions Consultant - Retail...
**Job Summary** Job Summary The Lead ASC is an Apple employee who serves as the Apple business manager and influencer in a hyper-business critical Reseller's store Read more
*Apple* Pay - Site Reliability Engineer - Ap...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.