Dec 88 Letters
Volume Number: | | 4
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Issue Number: | | 12
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Column Tag: | | £etters
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Happy Aniversary
By David E. Smith, Editor & Publisher, MacTutor
Prototyper vs FaceIt vs Programmers Extender
George R. Cossey
Author of Prototyper
First let me say that the goal of Prototyper is similar to the other two products, but the implementation is very different. The goal for all of us is to make designing and building a Macintosh program less painful.
Prototyper has a built-in visual editors and simulators for interactive graphical design of the user interface, while the other two products provide no direct visual interaction in the program design.
Prototyper generates source code that uses only Mac Toolbox and does not supply any private or additional libraries for linking to. The other two products supply libraries to link to and provide their own toolboxes to interface to. The other two products supply libraries to link to and provide their own toolboxes to interface to the Mac interface.
Programmers Extender and FaceIt both try to make the Mac interface less of a challenge by using custom designed libraries that combine the functionality of multiple toolbox calls along with some canned control code. My objection to that method, as a programmer, is that canned libraries work for only specific conditions and if my program requires something a little extra that is not in the canned library then I have to replace it with my own code that uses the Mac Toolbox anyway. Prototyper generates source code that uses only the Mac Toolbox, so any tweaking that I have to do to a routine is easily added.
I commend both Programmers Extender and FaceIt for developing their own interface libraries to make programming on the Mac easier. Programmers Extender is a fine product that shows the dedication and high level of expertise of the designers. FaceIt is a fairly recent newcomer and has potential to provide the same level of functionality that Programmers Extender does.
In summary, I developed Prototyper with two main goals in mind. The first was to make designing a programs interface like painting a picture in MacDraw, with objects that could be resized and repositioned visually. The second was to provide source code that used only the standard Mac Toolbox and not any special libraries. Both objectives were realized with Prototyper, and I feel it is in a different class than Programmers Extender and FaceIt which use special libraries of functions.
[I commend Mr. Cossey on his excellent product. I like designing my interface at a MacDraw-type level. I would say that this type of development tool is for programming like the Mac was for user interfaces. This is not to say that I do not like or use the other products when doing my own developing.
Prototyper is definitely not perfect. There are many things I would like added or changed. But this shows how much I like what Prototyper tries to do. I want to improve what it does, not just throw it out. I can see in the future that this will be the avenue of interface developing. The interactive feel of seeing your interface is very gratifying. Mr. Cossey, please keep improving Prototyper. I feel you have a product with lots of potential. -Kirk Chase, Assistant Editor, MacTutor]
Word 3.01 Word Wrap
Steve Seaquist
Temple Hills, MD
After much more sleuthing, Ive determined that font widths on the screen do not vary according to what printer is Chooserd. The reason why word wrap and tab stops vary between ImageWriters and LaserWriters is Words variation of how it measures an inch:
Chooser an ImageWriter, then Show Ruler, then get out a real-world ruler (a tape measure, for example) and hold it up to the screen. The inches that Word shows are notably longer than real-world inches.
Now start a print job using Tall Adjusted. Afterwards, the word wrap point will change. Then do a Page Preview. Afterwards the on-screen rulers measurements will also change, and the new rulers inches will be a lot closer to (a tiny bit shorter than) real-world inches. (The requirement of doing Page Preview to change the ruler is probably a bug. It should change automatically to reflect current word wrap and tab stops.)
I believe Word is using THPrint()^^.prInfo.iHRes to determine the number of pixels per inch in the on-screen ruler will accurately reflect the number of inches when the document is printed. This is the old aspect ratio problem.
Dots on the screen are square 74dpi x 74dpi.
Dots on IW, Tall are rectangles 72dpi x 80dpi.
Dots on IW, tall adj. are square 72dpi x 72dpi.
To answer my previous questions:
(1) There is indeed a good reason to change word wrap and tab stops when changing between IWs and LWs. The difference in aspect ratio would yield a different number of characters that could fit comfortably on a line. Because only the center or end point(s) positions of lines are guaranteed, the LW drivers QD-to-PS bottlenecks would generate lines longer than anticipated (left, right, or centered justified) or too compressed (fully justified). So the passage at the beginning of Tech Note 72 (about printing to LWs the same way as you would to IWs) is misleading.
(2) Contrary to my earlier suspicions, Word wasnt playing any tricks to change screen font widths. In actuality, printer resolution changes printout font widths, and Word simply adjusts its screen display accordingly.
(3) The trick to getting IW rough drafts of Word documents that are intended to be LWd is to use Tall Adjusted. I havent seen any mismatches yet, and I dont anticipate seeing any, because Word seems to use the same 72 dpi ruler in either case. Too bad Microsofts hotline people didnt know this. It wouldve save some people a lot of sleuthing.
Im tempted to use Tall Adjusted and LW fonts in all Word documents, so that the decision of whether to LW the doc can be postponed. Unfortunately, Tall Adjusted seems to slightly improve, but not eliminate, the problem where Best mode printing jams together words that are in LW fonts. This makes Best mode Worst and eliminates the qualitative middle ground between Faster and LW (a middle ground that still exists if the doc is in an IW font). My only guess as to what causes that problem is the facts that FScaleDisable implies FractEnable (Tech Note 92, page 2) and Best mode printing is scaled down from the double-size font if available.
[You would think that a big software corporation such as Microsoft wouldnt have such problems. I love Excel, and I tolerate Word. David uses WriteNow; there are a lot of advantages to this product. It can handle lots of pages without slowing down; it can control leading, but for some of the editing work which I do, WriteNows quirks just make me shake my head and say it is not much better than MacWrite. I was hoping FullWrite may answer my dreams, but I dont have the megs or the speed to give me what I need. Im looking into WordPerfect now for my editing needs. I know it wont be perfect either, but it has some promise. -ed]
More DB and C
Michael D. Sammer
Bartlesville, OK
Please let me compliment you on the fine journal, MacTutor. I enjoy reading it thoroughly, and it is very helpful. I program strictly in C, therefore, I would appreciate it if we could see more articles on C. This would be extremely helpful to me. Specifically, some articles on database management, hashing tables, and details regarding definitions of records in a file would be very helpful. Techniques for manipulating data back and forth from the disk to a data structure, efficient ways to mark the end of a record in a database would be helpful. I am also interested in a scheme for searching the database in regard to a group of different index parameters, ie, a list of all programmers who use a Macintosh, the C language, and are between the ages of 30 and 40. Efficient code for this type of a problem would be extremely educational.
Thank you very much for your assistance. Please continue the fine work which you and your staff have delivered.
[Yes, we have been laxed a little in the variety of languages covered in our journal. We have changed our article selection system to something that is hopefully more improved. But I get requests for more Fortran, more Lisp, more Assembly, as well as less on others. Any programmer worth his salt should be able to get information out of any language an application is written in even if it is not his preferred language (Jörg Langowski frequently has something very interesting in his column for me even though reading that Forth code is reading hard). I would also like to see more DB columns as well as WP, PS, and DTP. But unfortunately most of the articles I have on hand dont fit into those categories. All those who have been thinking of writing up some articles with this much meat, get a typing!. -ed]
MyTENew Suggestion
Moshe Foger
Tel Aviv, Israel
I would like to comment about calling ROM directly through pointers published in the last September issue (Mousehole Report, p. 18). In my opinion the code would not work for the following reason:
When Lightspeed calls the MyTENew, it adheres directly to Pascal stack conventions (leaving room for TEHandle and pushing pointers to the two rectangles) and jumps to MyTENew leaving the return address on the stack. However in MyTENew, the compiler automatically inserts Link A6, #0 which creates a new activation stack needed to access the functions parameters. The link instruction saves the previous contents of A6 on the stack. The JSR instruction also leaves a return address on the stack; thus when the ROM is activated, it treats the saved A6 and the original return address as the required rectangle pointers and puts the handle in the pointer to ViewRect
To correct it, I would suggest the following in MyTENew:
TEHandle MyTENew(Dest, View)
Rect *Dest, *View;
{
asm{
UNLK A6;Balance for Link from compilr
MOVE (A7)+,A3 ;POP return addr. to safe reg.
JSR TENew ;Jump to ROM
JUMP (A3); Return
}
}
Animated Cursors
David Stoops
Philadelphia, PA
I am an engineering undergraduate at Drexel University, a school considerably devoted to Apples University Consortium. I am writing in response to the heated discussion of animated cursors in the March and May 88 issues. In a rare moment of inspiration, I realized that animating the watch is a chore ideally suited for implementation as a VBLTask. Referring back to the June 86 MacTutor, which contains an article on screen switching animation using the Vertical Retrace Manager, I wrote the enclosed snipets of Lightspeed Pascal code that seems to do the job.
The routines make use of the acur resource, which should be copied along with the necessary CURS resources from the Finder into the project resource file. To use these routines, first call InitWatch to get handles to the cursors, then call StartWatch to display the animated watch while your program goes on about its business. A final call to StopWatch removes the task from the vertical retrace queue to halt animation. I find this scheme does a better job of animating the watch than that emploed by the Finder (notice how poorly the watch hands move during lengthy I/O operations under the Finder). Hope this proves useful.
unit WatchGlobals
interface
type
acur = record
whichWatch : longint;
Watch : array[1..8] of CursHandle;
end;
acurPtr = ^acur;
acurHandle = ^acurPtr;
var
currentWatch : integer;
WatchList : acurHandle;
VBL : VBLTask;
implementation
end.
unti WatchUtlities;
interface
uses
WatchGlobals;
procedure InitWatch;
procedure StartWatch;
procedure StopWatch;
implementation
procedure InitWatch; {Get the watch CursHandles}
var
watchcount : integer;
begin
WatchList := acurHandle(GetResource(acur,0));
{Will crash if acur isnt available}
with WatchList^^ do
begin
for watchcount := 1 to 8 do
GetCursor(HiWord(longint(Watch[watchcount])));
whichWatch := 0;
end;
end;
procedure AnimateWatch; {Our VBL routine}
begin
SetUpA5;
with WatchList^^ do
begin
if whichWatch >= 8 then
whichWatch := 1
else
whichWatch := whichWatch + 1;
SetCursor(Watch[whichWatch]^^);
end;
VBL.vblCount :=10;
RestoreA5;
end;
procedure StartWatch;
{Install our task in the vertical retrace queue}
var
err : OSErr;
begin
with VBL do
begin
qType := Integer(vType);
vblAddr := @AnimateWatch;
vblCount := 10; {Update watch every 10 ticks}
vblPhase := 0;
err := VInstall(@VBL);
end;
end;
procedure StopWatch;
{remove our task from the vertical retrace queue}
var
err : OSErr;
begin
err := VRemove(@VBL);
end;
end.