TweetFollow Us on Twitter

Feb 89 Mousehole
Volume Number:5
Issue Number:2
Column Tag:Mousehole report

Mousehole Report

By Rusty Hodge & Larry Nedry, Mousehole BBS

From: thecloud (Ken Mcleod, La Habra, CA)

Subject: ScrollRect()

I’d like to be able to use ScrollRect to cause one bitmap to scroll down *into* a window, as the contents of that window are simultaneously scrolling down out of the visRgn. Trouble is, the update region gets filled with the port’s bkPat (white) by ScrollRect, and this results in a “flash of white” before I can get the area redrawn. Can anyone point out a strategy for accomplishing this “smoothly”? I’m currently doing something like this:

for (i=1; i <= appropriate_multiple_of_inc; i++) {
ScrollRect(&theRect, 0, inc, myRgnHandle);
ScrollRect(&anotherRect, 0, inc, myRgnHandle);   
Draw_Stuff_In_anotherRect()  }

but I’m sure I just need someone to kick me in the right direction!

From: rdclark (Richard Clark, Tustin, CA)

Subject: A kick in the right direction

Look at the articles by Scott Boyd (“The MacHax Group”) in the past 2 years of MacTutor -- they show how to do some pretty weird stuff with off-screen bitmaps and the like, including a trick to get rid of the “flash of white” when moving/updating a window.

From: lsr (Larry Rosenstein, Cupertino, CA)

Subject: Re: ScrollRect()

The best thing to do is to create an offscreen bitmap and use CopyBits to draw the bitmap on the screen in its proper position. If I understand your application correctly, you want to smoothly change from one image to the other. In that case, you would need to have the combined image offscreen, and use a series of CopyBits calls to draw the appropriate rectangle on the screen. (You would start out by copying the entire first image, then most of the first and part of the second, etc.)

CopyBits works the fastest when Quickdraw doesn’t have to shift every scan line. If you can control the position of the window on the screen, then you should make sure that its global screen position is a multiple of 16 (or 32 on a Mac II).

There probably is a way to prevent ScrollRect from erasing things, but the resulting effect wouldn’t be acceptable either. You would notice the delay between the ScrollRect and the redraw.

From: thecloud (Ken Mcleod, La Habra, CA)

Subject: Re: ScrollRect()

It always comes down to CopyBits in the end! Thanks...

From: robert (Rob Anthony, Chicago, IL)

Subject: MacIntalk

Check out APDA (Apple Programmers and Developers Assoc., in Renton, WA). They had -- in their ‘Curiosity Shoppe’ section -- the MacinTalk Development Package v. 1.31. It has docs and tools for using MacinTalk (they say). I don’t have it, so I can’t give any personal experience, but the APDA folks should be able to answer your questions. Need to be an APDA member to order; about $20 a year for that, but well worth it for the Mac programmer.

From: rhyman (Richard A. Hyman, Morrison, CO)

Subject: Desktop File

Prior to release 5 of the system software, the invisible Desktop file contained a resource called FOBJ that contained info on the open directories, view-by type information, and so on. The Finder used this info when starting up after quitting an application or during the boot-up. The FOBJ resource no longer exists with the newer system releases except for 400k MFS volumes. Does anyone know how this information is stored under system releases 5 & 6??

From: lsr (Larry Rosenstein, Cupertino, CA)

Subject: Re: Dialog Hook Procedure Problem

The problem is that you are using a local procedure, and the ROM is expecting a procedure at the top level. This is true of all the ROM routines that expect a pointer to a procedure. (In Pascal, nested procedures expect to find an extra parameter on the stack, which is a pointer to the enclosing stack frame.)

From: mwatts (Michael Watts, Santa Clara, CA)

Subject: limit on scroll bar value

Hi. I am new to the mousehole and have spent an informative session catching up. There is one question which I need help on if someone would be so kind.

In the app which I am writing, I have to deal with data which contains more than 32k points. I want to scroll through this data using a scroll bar, however the max value is an integer (opps). Even if I write my own control, in IM V I-333 the upper value for the CNTL resource is 2 bytes (not enough). I have kludged a fix by breaking the stream into 32k point sections, however this adds another control to my window and complexity to the program.

Does anyone know how to get around this problem, and if so how?

From: thotpolc (Bill Evans, Irvine, CA)

Subject: Re: limit on scroll bar value

“Doctor, it hurts when I do this.”

“Don’t do that....”

Your kludge to break the stream into 32k point sections is a good start. I don’t think the designers of the Mac interface and toolbox really anticipated someone scrolling more precisely than this. Notice, however, that the scroll bar is between two arrows, each of which points away from it. You could use these to scroll more precisely. To get the flavor of this, use any word processing program to create a document with more than 64k lines. (Probably short lines will make the whole thing a little easier.) Then scroll back and forth, using all parts of the scroll bar: the thumb (which is that funny white box you can slide back and forth with your... well, with your thumb), the gray parts of the bar itself, and the arrows at each end. In a well-tempered word processor, a single click in one of these arrows should move you up or down by one line; holding down the mouse in one of these arrows should, after a short while, start scanning through the document in small increments. Go thou and do likewise.-- the Thought Police

From: rdclark (Richard Clark, Tustin, CA)

Subject: Re: limit on scroll bar value

There are a couple of ways to take care of your problem:

1) Redesign the software so that a single click on the down arrow moves you down by n points instead of 1 point (where n could be 1/4 screen or something.) Some how, I don’t think that’ll be satisfactory for you. 2) Write a custom control definition that uses something larger than an integer (an unsigned integer, maybe?), then avoid using calls like “SetCtlValue” and “GetCtlValue”. Fortunately, there’s a set of options available to you in writing a custom control definition that allow you to get away without Set/GetCtlValue. The first problem involves dragging the “thumb” portion of the scroll bar. If you look at IM I-331 and I-332, you’ll see that you can write a “drag”, “position”, and “thumb” routine that override the control manager (I suspect that the control manager uses the get/set control value calls.) These could read your “extended” position information and adjust the control accordingly. That leaves a different problem -- what happens if the user clicks in one of the arrows?? You’ll need to pass a message to your control to adjust itself by 1. The only reasonable way I can think of doing this is to make one of your control messages do double duty (you don’t want to pick a new message number since Apple might decide to use that message someday, and that could hurt.) How about calling the control definition with a second (third, fourth...) “initCntl” message and a special value in the “param” parameter?? Your definition could recognize the special value (or the fact that you’re already initialized) and adjust itself accordingly.

On second thought, why not just live with a scroll bar position which is an approximation of the real position?? After all, we won’t be seeing 33K pixel by 33K pixel screens in the near future, so all your extra effort won’t mean much on the display.

From: mwatts (Michael Watts, Santa Clara, CA)

Subject: Re: limit on scroll bar value

That is a good suggestion. I was fixating on using the scroll bar value as my numerical indicator on where I was in the data set. Your suggestion implies I have a position variable which is incremented by the scroll step parameter and then position the thumb relative to the size of the data set.--a very “thoughtful” piece of advice.

ps- I still consider this a kludge solution. there should be a way to have the value of the scroll bar be a long integer.

From: rdclark (Richard Clark, Tustin, CA)

Subject: Re: limit on scroll bar value

Actually, I like the thought police’s answer MUCH better. (But I never could resist a good challenge!)

From: thotpolc (Bill Evans, Irvine, CA)

Subject: Re: limit on scroll bar value

rdclark (Richard Clark, Tustin, CA) writes:

On third thought, if you want exactly what you want without kludges, why not throw away the whole idea of part numbers and messages doing double duty and custom control definitions, and just do the whole durn thang using normal QuickDraw calls? I did this once with buttons which I wanted to have a special shape, and it was fun! If I ever use scroll bars, I’m going to want the thumb to be not square, but long enough to show what portion of the document is on the screen. That way, for example, if almost all of the document is on the screen and you’re at the beginning of the document, you’ll see a thumb which occupies almost all of the scroll bar, with a small gray area at the bottom. And if you click in that small area, you’ll see a large thumb move a small distance (while the data on the screen is doing exactly the same thing), not a small thumb jump grotesquely from the top to the bottom of the scroll bar.

And if I ever get around to having this fun, you can bet I’ll do it all without a formally defined control definition, thank you very much.

Does any of this give you the feeling that my favorite language is assembly? -- the Thought Police

From: rdclark (Richard Clark, Tustin, CA)

Subject: Re: limit on scroll bar value

Actually, it’s giving me a feeling that you’re a GEM fanatic! (duck incoming tomatos)

From: dhands (David Hands, Salem, OR)

Subject: MPW Print Interfaces

In the interface files of MPW Pascal there are two files, PrintTraps.p and MacPrint.p, that contain roughly the same calls. What’s the difference and when should one be used over the other?

From: think (Think Technologies, Bedford, MA)

Subject: Re: MPW Print Interfaces

PrintTraps.p is the trap-based interface to the Print Manager; the traps are implemented in the Mac SE and Mac II ROMs, and in System 4.1 or later on all machines.

MacPrint.p is the glue-based interface, and will work on all Macs, on all versions of the System software.

Rich Siegel Staff Software Engineer THINK Technologies Division Symantec Corp. Mousehole: think Usenet: singer@endor.uucp

Any opinions stated here do not necessarily represent the views or policies of the Symantec Corporation.

From: think (Think Technologies, Bedford, MA)

Subject: Lightspeed Pascal 2.0 Ships!

The following is excerpted from the press release announcing the shipment of THINK’s Lightspeed Pascal and Just Enough Pascal. the official announcement was made yesterday (Monday, November 14) at COMDEX, in Las Vegas.

“Symantec Corporation today announced THINK’s Lightspeed Pascal(tm) version 2.0 and Just Enough Pascal(tm) are shipping this week.

For a limited time, beginning this week, Symantec will bundle a copy of Just Enough Pascal in specially marked boxes of THINK’s Lightspeed Pascal. the suggested list price of the bundle is $149, and the promotion will continue until January 31, 1989.

Just Enough Pascal is the first tutorial of its kind, taking an inter- active approach to teaching the fundamentals of Pascal programming on the Macintosh. Users learn by building a real Macintosh game application in THINK’s Lightspeed Pascal, with all instructions and explanations provided on-line. As the user builds the program through various stages, he sees the results of each code change graphically illustrated on the screen.

New version 2.0 of THINK’s Lightspeed Pascal now generates the fastest, most compact code of any Pascal compiler available for the Macintosh. It provides options to generate code for the 68020 and for the 68881 math coprocessor, and features full access to all of the Macintosh ROM routines.

New and enhanced features of version 2.0 include: a fast, multipass optimizing compiler which produces compact, commercial-quality code; Object Pascal support; increased editor flexibility for virtually unlimited program size; and enhanced source-level debugger; and language extensions for improved compatibility with Apple’s Macintosh Programmer’s Workshop (MPW) Pascal.

Special introductory list pricing for THINK’s Lightspeed Pascal version 2.0 is $125. The price will increase to $149, effective February 1, 1989. Just Enough Pascal’s suggested list price is $75.

Registered owners may upgrade to THINK’s Lightspeed Pascal version 2.0 for $52.50 ($49 plus $3.50 shipping and handling; CA residents must add 7% sales tax, for a total of $55.93}. To upgrade, users must send a letter, including payment (US checks only) and registration number to:

Symantec Corporation Customer Service Department 10201 Torre Avenue Cupertino, CA 95014 ATTN: THINK’s Lightspeed Pascal 2.0 Upgrade

Purchasers of version 1.11 or earlier who bought the product after July 1, 1988 are entitled to a free upgrade. A dated proof of purchase must accompany the upgrade request. Further upgrade information is available from Symantec’s Customer Service Department at (408) 252-3570.

Symantec will also extend the special $175 introductory pricing of THINK’s Lightspeed C version 3.0 through January 31, 1989. Effective February 1, 1989 the price will increase to $249.” Rich Siegel Staff Software Engineer THINK Technologies Division Symantec Corp. Mousehole: think Usenet: singer@endor.uucp . [Any opinions stated here do not necessarily represent the views or policies of the Symantec Corporation. Pricing is still being determined by Symantec at Press time. -Ed]

 
AAPL
$103.22
Apple Inc.
+0.72
MSFT
$44.88
Microsoft Corpora
-0.55
GOOG
$574.15
Google Inc.
+2.55

MacTech Search:
Community Search:

Software Updates via MacUpdate

NetShade 6.0.2 - Browse privately using...
NetShade is an Internet security tool that conceals your IP address on the web. NetShade routes your Web connection through either a public anonymous proxy server, or one of NetShade's own dedicated... Read more
Mac DVDRipper Pro 5.0 - Copy, backup, an...
Mac DVDRipper Pro is the DVD backup solution that lets you protect your DVDs from scratches, save your batteries by reading your movies from your hard disk, manage your collection with just a few... Read more
pwSafe 3.1 - Secure password management...
pwSafe provides simple and secure password management across devices and computers. pwSafe uses iCloud to keep your password databases backed-up and synced between Macs and iOS devices. It is... Read more
StatsBar 1.8 - Monitor system processes...
StatsBar gives you a comprehensive and detailed analysis of the following areas of your Mac: CPU usage Memory usage Disk usage Network and bandwidth usage Battery power and health (MacBooks only)... Read more
Path Finder 6.5.5 - Powerful, award-winn...
Path Finder is a file browser that combines the familiar Finder interface with the powerful utilities and innovative features. Just a small selection of the Path Finder 6 feature set: Dual pane... Read more
QuarkXPress 10.2.1 - Desktop publishing...
With QuarkXPress, you can communicate in all the ways you need to -- and always look professional -- in print and digital media, all in a single tool. Features include: Easy to Use -- QuarkXPress is... Read more
Skype 6.19.0.450 - Voice-over-internet p...
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
VueScan 9.4.41 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
Cloud 3.0.0 - File sharing from your men...
Cloud is simple file sharing for the Mac. Drag a file from your Mac to the CloudApp icon in the menubar and we take care of the rest. A link to the file will automatically be copied to your clipboard... Read more
LibreOffice 4.3.1.2 - Free Open Source o...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more

Latest Forum Discussions

See All

Function Space, a Social Network App for...
Function Space, a Social Network App for Science, Launches on iOS Posted by Ellis Spice on September 2nd, 2014 [ permalink ] | Read more »
Treasure Tombs: Ra Deal Coming from Bulk...
Treasure Tombs: Ra Deal Coming from Bulkypix and Dark Tonic This Fall Posted by Jessica Fisher on September 2nd, 2014 [ permalink ] Dark Tonic and | Read more »
Tiny Tower Vegas Review
Tiny Tower Vegas Review By Jennifer Allen on September 2nd, 2014 Our Rating: :: STEADY DEVELOPMENTUniversal App - Designed for iPhone and iPad Build a huge tower again but Vegas-style in Tiny Tower Vegas.   | Read more »
The Manhattan Project Review
The Manhattan Project Review By Andrew Fisher on September 2nd, 2014 Our Rating: :: ROCKET SCIENCEUniversal App - Designed for iPhone and iPad The Manhattan Project offers a great Euro-style gameplay experience, but it is totally... | Read more »
Rhonna Designs Magic (Photography)
Rhonna Designs Magic 1.0 Device: iOS Universal Category: Photography Price: $1.99, Version: 1.0 (iTunes) Description: Want to sprinkle *magic* on your photos? With RD Magic, you can add colors, filters, light leaks, bokeh, edges,... | Read more »
This Week at 148Apps: August 25-29, 2014
Shiny Happy App Reviews   | Read more »
Qube Kingdom – Tips, Tricks, Strategies,...
Qube Kingdom is a tower defense game from DeNA. You rally your troops – magicians, archers, knights, barbarians, and others – and fight against an evil menace looking to dominate your kingdom of tiny squares. Planning a war isn’t easy, so here are a... | Read more »
Qube Kingdom Review
Qube Kingdom Review By Nadia Oxford on August 29th, 2014 Our Rating: :: KIND OF A SQUARE KINGDOMUniversal App - Designed for iPhone and iPad Qube Kingdom has cute visuals, but it’s a pretty basic tower defense game at heart.   | Read more »
Fire in the Hole Review
Fire in the Hole Review By Rob Thomas on August 29th, 2014 Our Rating: :: WALK THE PLANKUniversal App - Designed for iPhone and iPad Seafoam’s Fire in the Hole looks like a bright, 8-bit throwback, but there’s not enough booty to... | Read more »
Alien Creeps TD is Now Available Worldwi...
Alien Creeps TD is Now Available Worldwide Posted by Ellis Spice on August 29th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »

Price Scanner via MacPrices.net

Apple refurbished iPads available for up to $...
Apple is offering Certified Refurbished iPad Airs for up to $140 off MSRP. Apple’s one-year warranty is included with each model, and shipping is free. Stock tends to come and go with some of these... Read more
Are We Now In The Post-Post-PC Era?
A longtime and thoroughgoing laptop aficionado, I was more than a little dismayed by Steve Jobs’s declaration back in 2010 when he sprang the iPad on an unsuspecting world. that we’d entered a “post-... Read more
PC Outlook Improves, But 2014 Shipments Still...
According to the International Data Corporation (IDC) Worldwide Quarterly PC Tracker, worldwide PC shipments are expected to fall by -3.7 percent in 2014. To hat’s actually an improvement from the... Read more
IDC Lowers Tablet Sales Projections for 2014...
Following a second consecutive quarter of softer than expected demand, International Data Corporation (IDC) has lowered its worldwide tablet plus 2-in-1 forecast for 2014 to 233.1 million units. The... Read more
Apple now offering refurbished 21-inch 1.4GHz...
The Apple Store is now offering Apple Certified Refurbished 21″ 1.4GHz iMacs for $929 including free shipping plus Apple’s standard one-year warranty. Their price is $170 off the cost of new models,... Read more
Save $50 on the 2.5GHz Mac mini, on sale for...
B&H Photo has the 2.5GHz Mac mini on sale for $549.99 including free shipping. That’s $50 off MSRP, and B&H will also include a free copy of Parallels Desktop software. NY sales tax only. Read more
Save up to $300 on an iMac with Apple refurbi...
The Apple Store has Apple Certified Refurbished iMacs available for up to $300 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free. These are the best prices on... Read more
The Rise of Phablets
Carlisle & Gallagher Consulting Group, a businesses and technology consulting firm focused solely on the financial services industry, has released an infographic depicting the convergence of... Read more
Bad Driver Database App Allows Good Drivers t...
Bad Driver Database 1.4 by Facile Group is a new iOS and Android app that lets users instantly input and see how many times a careless, reckless or just plain stupid driver has been added to the... Read more
Eddy – Cloud Music Player for iPhone/iPad Fre...
Ukraine based CapableBits announces the release of Eddy, its tiny, but smart and powerful cloud music player for iPhone and iPad that allows users to stream or download music directly from cloud... Read more

Jobs Board

*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* 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* 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* 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
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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.