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. *

 
AAPL
$119.00
Apple Inc.
+1.40
MSFT
$47.75
Microsoft Corpora
+0.28
GOOG
$540.37
Google Inc.
-0.71

MacTech Search:
Community Search:

Software Updates via MacUpdate

Skype 7.2.0.412 - Voice-over-internet ph...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
HoudahSpot 3.9.6 - Advanced file search...
HoudahSpot is a powerful file search tool built upon MacOS X Spotlight. Spotlight unleashed Create detailed queries to locate the exact file you need Narrow down searches. Zero in on files Save... Read more
RapidWeaver 6.0.3 - Create template-base...
RapidWeaver is a next-generation Web design application to help you easily create professional-looking Web sites in minutes. No knowledge of complex code is required, RapidWeaver will take care of... Read more
iPhoto Library Manager 4.1.10 - Manage m...
iPhoto Library Manager lets you organize your photos into multiple iPhoto libraries. Separate your high school and college photos from your latest summer vacation pictures. Or keep some photo... Read more
iExplorer 3.5.1.9 - View and transfer al...
iExplorer is an iPhone browser for Mac lets you view the files on your iOS device. By using a drag and drop interface, you can quickly copy files and folders between your Mac and your iPhone or... Read more
MacUpdate Desktop 6.0.3 - Discover and i...
MacUpdate Desktop 6 brings seamless 1-click installs and version updates to your Mac. With a free MacUpdate account and MacUpdate Desktop 6, Mac users can now install almost any Mac app on macupdate.... Read more
SteerMouse 4.2.2 - Powerful third-party...
SteerMouse is an advanced driver for USB and Bluetooth mice. It also supports Apple Mighty Mouse very well. SteerMouse can assign various functions to buttons that Apple's software does not allow,... Read more
iMazing 1.1 - Complete iOS device manage...
iMazing (was DiskAid) is the ultimate iOS device manager with capabilities far beyond what iTunes offers. With iMazing and your iOS device (iPhone, iPad, or iPod), you can: Copy music to and from... Read more
PopChar X 7.0 - Floating window shows av...
PopChar X helps you get the most out of your font collection. With its crystal-clear interface, PopChar X provides a frustration-free way to access any font's special characters. Expanded... Read more
OneNote 15.4 - Free digital notebook fro...
OneNote is your very own digital notebook. With OneNote, you can capture that flash of genius, that moment of inspiration, or that list of errands that's too important to forget. Whether you're at... Read more

Latest Forum Discussions

See All

Lucha Amigos (Games)
Lucha Amigos 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Forget Ninja Turtles, and meet Wrestlers Turtles! Crazier, Spicier and…Bouncier! Sling carapaces of 7 Luchadores to knock all... | Read more »
Raby (Games)
Raby 1.0.3 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0.3 (iTunes) Description: ***WARNING - Raby runs on: iPhone 5, iPhone 5C, iPhone 5S, iPhone 6, iPhone 6 Plus, iPad Mini Retina, iPad Mini 3, iPad 4, iPad Air,... | Read more »
Oddworld: Stranger's Wrath (Games)
Oddworld: Stranger's Wrath 1.0 Device: iOS Universal Category: Games Price: $5.99, Version: 1.0 (iTunes) Description: ** PLEASE NOTE: Oddworld Stranger's Wrath requires at least an iPhone 4S, iPad 2, iPad Mini or iPod Touch 5th gen... | Read more »
Bounce On Back (Games)
Bounce On Back 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: | Read more »
Dwelp (Games)
Dwelp 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: === 50% off for a limited time, to celebrate release === Dwelp is an elegant little puzzler with a brand new game mechanic. To complete a... | Read more »
Make Way for Fat Chicken, from the Maker...
Make Way for Fat Chicken, from the Makers of Scrap Squad Posted by Jessica Fisher on November 26th, 2014 [ permalink ] Relevant Games has announced they will be releasing their reverse tower defense game, | Read more »
Tripnary Review
Tripnary Review By Jennifer Allen on November 26th, 2014 Our Rating: :: TRAVEL BUCKET LISTiPhone App - Designed for the iPhone, compatible with the iPad Want to create a travel bucket list? Tripnary is a fun way to do exactly that... | Read more »
Ossian Studios’ RPG, The Shadow Sun, is...
Ossian Studios’ RPG, The Shadow Sun, is Now Available for $4.99 Posted by Jessica Fisher on November 26th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Mmmm, Tasty – Having the Angry Birds for...
The very first Angry Birds debuted on iOS back in 2009. When you sit back and tally up the number of Angry Birds games out there and the impact they’ve had on pop culture as a whole, you just need to ask yourself: “How would the birds taste... | Read more »
Rescue Quest Review
Rescue Quest Review By Jennifer Allen on November 26th, 2014 Our Rating: :: PATH BASED MATCH-3Universal App - Designed for iPhone and iPad Guide a wizard to safety by matching gems. Rescue Quest might not be an entirely original... | Read more »

Price Scanner via MacPrices.net

Apple Store Black Friday sale for 2014: $100...
BLACK FRIDAY The Apple Store has posted their Black Friday deals for 2014. Receive a $100 PRODUCT(RED) branded iTunes gift card with the purchase of select Macs, $50 with iPads, and $25 with iPods,... Read more
Black Friday: 15% off iTunes Gift Cards
Staples is offering 15% off $50 and $100 iTunes Gift Cards on their online store as part of their Black Friday sale. Click here for more information. Shipping is free. Best Buy is offering $100... Read more
BEVL Releases Dock Tailored for iPhone 6 and...
Seattle based BEVL has released their first product: an iPhone dock that is divergent in build quality, rock-solid function and visual simplicity to complement the iPhone. BEVL is now accepting... Read more
Black Friday: $150 off 13-inch Retina MacBook...
 Best Buy has 13-inch 2.6GHz Retina MacBook Pros on sale for $150 off MSRP on their online store as part of their Black Friday sale. Choose free shipping or free local store pickup (if available).... Read more
Black Friday: $300 off 15-inch Retina MacBook...
 B&H Photo has the new 2014 15″ Retina MacBook Pros on sale for $300 off MSRP as part of their Black Friday sale. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.2GHz Retina... Read more
Black Friday: Up to $140 off MacBook Airs, fr...
 B&H Photo has 2014 MacBook Airs on sale for up to $140 off MSRP as part of their Black Friday sale. Shipping is free, and B&H charges NY sales tax only: - 11″ 128GB MacBook Air: $799 $100... Read more
Black Friday: 13-inch 2.5GHz MacBook Pro on s...
 Best Buy has the 13″ 2.5GHz MacBook Pro on sale for $899.99 on their online store as part of their Black Friday sale. Choose free shipping or free instant local store pickup (if available). Their... Read more
Black Friday: 21-inch 1.4GHz iMac on sale for...
 Best Buy has the 21″ 1.4GHz iMac on sale for $899.99 on their online store as part of their Black Friday sale. Their price is $200 off MSRP. Choose free shipping or free local store pick up. Price... Read more
Black Friday iPad Air 2 sale prices, $100 off...
 Best Buy has iPad Air 2s on sale for $100 off MSRP on their online store for Black Friday. Choose free shipping or free local store pickup (if available). Sale prices available for online orders... Read more
2014 1.4GHz Mac mini on sale for $449, save $...
 B&H Photo has the new 1.4GHz Mac mini on sale for $449.99 including free shipping plus NY tax only. Their price is $50 off MSRP, and it’s the lowest price available for this new model. Adorama... Read more

Jobs Board

*Apple* Solutions Consultant (ASC) - Apple (...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, 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
*Apple* Solutions Consultant (ASC) - Apple (...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
*Apple* Solutions Consultant (ASC) - Apple (...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.