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]

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

VirtualBox 5.1.30 - x86 virtualization s...
VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers... Read more
ScreenFlow 7.1.1 - Create screen recordi...
ScreenFlow is powerful, easy-to-use screencasting software for the Mac. With ScreenFlow you can record the contents of your entire monitor while also capturing your video camera, microphone and your... Read more
Adobe Flash Player 27.0.0.170 - Plug-in...
Adobe Flash Player is a cross-platform, browser-based application runtime that provides uncompromised viewing of expressive applications, content, and videos across browsers and operating systems.... Read more
Xcode 9.0.1 - Integrated development env...
Xcode includes everything developers need to create great applications for Mac, iPhone, iPad, and Apple Watch. Xcode provides developers a unified workflow for user interface design, coding, testing... Read more
TotalFinder 1.10.2 - Adds tabs, hotkeys,...
TotalFinder is a universally acclaimed navigational companion for your Mac. Enhance your Mac's Finder with features so smart and convenient, you won't believe you ever lived without them. Features... Read more
Backblaze 5.1.0.134 - 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
Postbox 5.0.20 - Powerful and flexible e...
Postbox is a new email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even... Read more
Corel Painter 18.1.0.651 - Digital art s...
Corel Painter lets you advance your digital art style with painted textures, subtle glazing brushwork, interactive gradients, and realistic Natural-Media. Easily transition from traditional to... Read more
QuarkXPress 13.1.0.0 - Desktop publishin...
QuarkXPress 2017 is the new version that raises the bar for design and productivity. With non-destructive graphics and image editing directly within your layout, you no longer have to choose between... Read more
Backblaze 5.1.0.134 - 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

Home Street guide - how to make friends...
From the creators of Food Street comes Home Street, a new simulation game that tasks you with building a social network and designing a beautiful home. It's a bit like The Sims, but you won't have to worry about the daily chores involved (feeding,... | Read more »
Color Ballz guide - how to bounce to the...
Color Ballz is an addictive new arcade title from Ketchapp Studios. It takes old school mechanics from games like Brickles and puts a fun twist on it. Your job? To catch balls with a paddle and send them back into a chute to be carried back to... | Read more »
Q&A: A-33 Studio explains why Combat...
When it comes to mobile FPS, it’s often tricky to get the fundamentals right on a platform lacking a physical controller, large display and hefty RAM. With Combat Squad: Project Wednesday, A-33 Studio bravely took on the challenge of making a... | Read more »
Taichi Panda 3: Dragon Hunter guide - ti...
Taichi Panda 3: Dragon Hunter launched this week to players all over the world. It's a beautiful mobile MMORPG that blends elements of Eastern and Western fantasy. It reminds us of a mix between World of Warcraft and Jade Empire. MMO's can have a... | Read more »
The best new games we played this week -...
Phew. It has been a week, but now it's time to relax, put your feet up, and enjoy some brand new mobile games. It was a bit of slow week, but there's still plenty of new titles to add to your collection. Here are four of our favorites. [Read... | Read more »
Yoink - Improved Drag and Drop (Product...
Yoink - Improved Drag and Drop 1.0 Device: iOS Universal Category: Productivity Price: $2.99, Version: 1.0 (iTunes) Description: Yoink for iPad and iPhone lets you easily and quickly store items you drag, copy or share, for later use... | Read more »
Cottage Garden (Games)
Cottage Garden 1.11 Device: iOS Universal Category: Games Price: $4.99, Version: 1.11 (iTunes) Description: | Read more »
Into the Dead 2 guide - how to survive t...
Into the Dead 2 is an endless gunner, of sorts, with a lot of grit and satisfying gunplay behind it. The game looks amazing, and tells an effective story to boot. Plus, it has some quality voice acting behind it to really bring the story to life... | Read more »
Smash Up - The Card Game (Games)
Smash Up - The Card Game 1.0.7 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.7 (iTunes) Description: ***“It’s a goofy theme with fun art and high replayability, but beneath that veneer of casual play is a great... | Read more »
Dive in to Combat Squad if you’re lookin...
Earlier this year, A-33 Studio made the leap from developing Counter Strike Online to launching its very own FPS for the mobile. Combat Squad: Project Wednesday pits your team of mercs against the world in multiplayer death matches, so if you’re on... | Read more »

Price Scanner via MacPrices.net

Sale! 10″ Apple WiFi iPad Pros for up to $100...
B&H Photo has 10.5″ WiFi iPad Pros in stock today and on sale for $50-$100 off MSRP. Each iPad includes free shipping, and B&H charges sales tax in NY & NJ only: – 10.5″ 64GB iPad Pro: $... Read more
Apple iMacs on sale for up to $130 off MSRP w...
B&H Photo has 21-inch and 27-inch iMacs in stock and on sale for up to $130 off MSRP including free shipping. B&H charges sales tax in NY & NJ only: – 27″ 3.8GHz iMac (MNED2LL/A): $2179 $... Read more
2017 3.5GHz 6-Core Mac Pro on sale for $2799,...
B&H Photo has the 2017 3.5GHz 6-Core Mac Pro (MD878LL/A) on sale today for $2799 including free shipping plus NY & NJ sales tax only . Their price is $200 off MSRP. Read more
12″ 1.2GHz Space Gray MacBook on sale for $11...
Amazon has the 2017 12″ 1.2GHz Space Gray Retina MacBook on sale for $100 off MSRP. Shipping is free: 12″ 1.2GHz Space Gray MacBook: $1199.99 $100 off MSRP Read more
Bare Bones Software Releases macOS High Sierr...
Bare Bones Software has announced the release and immediate availability of BBEdit 12.0, a significant upgrade to its professional strength text and code editor. BBEdit 12 introduces a new foundation... Read more
Yale Announces Availability of Apple HomeKit-...
Yale Locks & Hardware has announced that Apple HomeKit support for its Assure Lock family is available this month. The new Yale iM1 Network Module, which provides support for the Apple Home app... Read more
Clearance 2016 13″ MacBook Pros, refurbished,...
Apple has Certified Refurbished 2016 13″ MacBook Pros available starting at $1189. An Apple one-year warranty is included with each model, and shipping is free: – 13″ 2.9GHz/512GB Touch Bar Gray... Read more
12-inch 64GB iPad Pro on sale for $749, save...
Adorama has 12″ 64GB iPad Pros on sale today for $749 including free shipping plus NY & NJ sales tax only. Their price is $50 off MSRP. Read more
13″ 3.1GHz/256GB Silver MacBook Pro on sale f...
Amazon has the Silver 13″ 3.1GHz/256GB MacBook Pro (MPXX2LL/A) on sale for $1699 including free shipping. Their price is $100 off MSRP. Read more
12″ MacBook available for $1099 with Apple re...
Apple has Certified Refurbished 2017 12″ Retina MacBooks available for $200-$240 off the cost of new models. Apple will include a standard one-year warranty with each MacBook, and shipping is free.... Read more

Jobs Board

*Apple* Retail - Multiple Positions - Apple,...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Retail - Multiple Positions - Apple,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Retail - Multiple Positions - Farmin...
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 - Apple...
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 - Apple...
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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.