TweetFollow Us on Twitter

Apr 87 Letters
Volume Number:3
Issue Number:4
Column Tag:Letters

Letters

Postscript Plotting

Philip Baumeister

Loomis, CA

As a new subscriber, let me convey thanks for a great magazine. But as many of your letters seem to contribute information, I seek it. When I write my own plot graphs, I approximate curves the quick and dirty way, with short segments of straight lines. The line itself is drawn at 300 dots/inch on the LaserWriter, but (alas!) the locations of the ends of the line are in pixel coordinates, which means that there are steps, and a resolution of only the nearest 1/72 of an inch in the location of the line. What can I do?

[This may or may not answer your question as you expected, but you might try writing two plot routines; one for the screen in quickdraw, and one for the LaserWriter in Postscript. The following sample program does this. It displays a black box with a plotted line using quickdraw on the screen in Microsoft Basic (see fig. 1). Then it opens a text file and writes a short Postscript program to the file that when downloaded to a LaserWriter, prints the same thing but in Postscript. This way you can plot at the LaserWriter resolution of 300 dots per inch. -Ed]


{1}
REM Basic Postscript Demo
REM  by D. Smith, MS Basic
 CLS
 WINDOW CLOSE 1
MENU
MENU 1,0,0,”File”:FOR i=3 TO 6:MENU i,0,0,””:NEXT i
MENU 3,0,1,”Demo”
MENU 3,1,1,”Draw Line”
MENU 3,2,1,”Quit”
ON MENU GOSUB eventloop:MENU ON
idle:GOTO idle
‘----------------------------------------------------------
eventloop:
MenuStuff=MENU(0)
menuitem=MENU(1)
ON menuitem GOSUB Draw, Quit
RETURN
‘----------------------------------------------------------
Draw:
WINDOW 1,””,(100,75)-(350,150),4
WINDOW OUTPUT 1
GOSUB screendraw
GOSUB Postscript
GOSUB screendraw ‘ update window
MENU
RETURN
‘----------------------------------------------------------
Quit:
CLOSE
WINDOW CLOSE 1
MENU RESET
END
‘----------------------------------------------------------
screendraw:
TEXTFONT(0):TEXTSIZE(12):TEXTFACE(0)
LOCATE 3,10:PRINT “Here is a Basic Line”
LINE (10,10) - (60,60),33,bf
LINE (15,15) - (55,55),30
RETURN
‘----------------------------------------------------------
Postscript:
FIL1$=FILES$(0,”Enter Postscript File ...”):IF FIL1$=”” THEN FIL1$=”LINE.TXT”
 NAM1$=FIL1$
 OPEN NAM1$ FOR OUTPUT AS #1
PRINT #1, “%!PS-Adobe-1.0”
PRINT #1, “%%Title: Postscript Line”
PRINT #1, “%%DocumentFonts: (atend)”
PRINT #1, “%%Creator: Basic”
PRINT #1, “%%CreationDate: 3/1/1987 5:30 PM”
PRINT #1, “%%Pages: (atend)”
PRINT #1, “%%BoundingBox: 0 0 612 792”
PRINT #1, “%%EndComments”
PRINT #1, “%%Document prolog now follows”
PRINT #1, “grestoreall”
PRINT #1, “initgraphics”
PRINT #1, “/pageproc{} def”
PRINT #1, “%%EndProlog”
PRINT #1, “%%Line Example”
PRINT #1, “%%Procedures now follow”

PRINT #1, “/Times-BoldItalic findfont”
PRINT #1, “36 scalefont setfont”

PRINT #1, “/fillbox”
PRINT #1, “{newpath”
PRINT #1, “125 360 moveto”
PRINT #1, “0 72 rlineto”
PRINT #1, “72 0 rlineto”
PRINT #1, “0 -72 rlineto”
PRINT #1, “closepath”
PRINT #1, “0.0 setgray”
PRINT #1, “fill”
PRINT #1, “}def”

PRINT #1, “/box”
PRINT #1, “{newpath”
PRINT #1, “120 355 moveto”
PRINT #1, “0 82 rlineto”
PRINT #1, “400 0 rlineto”
PRINT #1, “0 -82 rlineto”
PRINT #1, “closepath”
PRINT #1, “0.0 setgray”
PRINT #1, “stroke”
PRINT #1, “}def”

PRINT #1, “/line”
PRINT #1, “{newpath”
PRINT #1, “130 427 moveto”
PRINT #1, “192 365 lineto”
PRINT #1, “1.0 setgray”
PRINT #1, “stroke”
PRINT #1, “}def”

PRINT #1, “%% main program”
PRINT #1, “.8 setlinewidth”
PRINT #1, “fillbox”
PRINT #1, “line”
PRINT #1, “210 380 moveto”
PRINT #1, “.7 setgray”
PRINT #1, “(Here is a Basic Line) show”
PRINT #1, “.1 setlinewidth”
PRINT #1, “box”
PRINT #1, “showpage”
PRINT #1, “%% End of Example”
PRINT #1, “%%Trailer”
PRINT #1, “%%Pages:1”
CLOSE #1
RETURN

Fig. 1 Plot a line in Quickdraw & Postscript!

V.I.P. Improves!

Tom Nalevanko

Mainstay, Agoura Hills, CA

Thank you for your coverage of Visual Interactive Programming; V.I.P. users and potential users appreciate the comparitive viewpoint that can only be provided by a multi-language interest publication like MacTutor.

Since the release of V.I.P. in January, we’ve received a number of letters from customers expressing their satisfaction and offering suggestions for improvement. Since we couldn’t answer all of these letters, we did an even better thing. We took the best suggestions and implemented them in a new version 2.1 of V.I.P. This update will be sent, at no charge, to all registered V.I.P. users in March.

The V.I.P. v2.1 update includes the following improvements:

Feature Extensions: Ability to access all fonts, ability to edit Case logic structure, use of window with “grow” box, ability to use “About ...” in apple menu, movement about the flow diagram using arrow keys, use of any ASCII character in a string, etc.

New Intrinsic Functions: err, point, toplft, botrgt, and rect.

New Procedures: draw character, string to scrap, scrap to string, get pen position, set text mode, is real font, get font name, move, line, get picture info, get window title, get active window, undo text, get text, set dlog/alert font and set print options.

Supplementary products that we have announced will be available in April. These include translators to MPW C and Pascal, Lightspeed C and Pascal, and TurboPascal as well as external procedure classes: Speech Manager, Grid Manager, Database Manager, Multi-user Database Manager and the Matrix Manager. [See the VIP article in this issue for a discussion of the LS C translator, which is now functional. -Ed]

MS Basic Compiler Code Expansion

I.N. Botnick

Los Angeles, CA

I’ve been a BASIC programmer for seven years, from the Apple II+ to the IBM PC and finally to the Macintosh. I”ve used IBM Basic I & II, QuickBasic, BetterBasic, True Basic, ZBasic and now MS Basic on the Mac. I want you to know that the Microsoft Basic Compiler for the Macintosh is one of the worse compilers I have ever used. It is unbelievable that a company of Microsoft’s reputation would put out a compiler that is so bad. Take a look at the chart below:

Program ASCII Size Compile Size Memory Use

#1 148K 375K 625K

#2 127K 327K 550K

#3 111K 293K 525K

#4 93K 254K 475K

Each of these programs was designed to run in 330K to 465K of memory, but as you can see, the compiler is generating unusually large code. One main reason is because they are putting 8 bytes in front of each statement for error and event trapping. Program #1 has 8300 statements but only 2550 lines. In all my years of programming, I have never seen a compiler that produced a 375K executable program from a 148K ASCII file! With this version, I still cannot:

1. Run a program from a compiled BASIC program.

2. Read the names of files on a disk and load them into an array.

3. Get the amount of space available on a disk.

4. Create a folder

5. Delete a folder

6. Find the name for a volume without using the FILE$ statement.

7. Set a volume’s name.

8. Find the size of the current screen. (New Macs, remember?)

9. Use color (New Macs?)

10. Init a disk.

11. Get the name of the current printer.

12. Get the name of the file that was clicked to launch the program.

13. Open an included library without a fixed path name (a Macintosh No-No!)

Microsoft Responds

Art Schumer, Program Manager

Microsoft Corp.

As the new Program Manager for Macintosh Languages here at Microsoft, let me thank Dave Kelly for the fine review you wrote in the February issue on our new interpreter and compiler and may I respond to some of the bugs you and your readers have uncovered and which you communicated to me in your recent letter.

Terminal Program: We are actually aware of three seperate problems with the communications port. We are working to fix these problems. We have a patch for one of them.

Default Window: Your right! The display of a default window is annoying in compiled programs. This will be addressed in the next major release.

Zoom Box Support: This will be added to the present method of double-clicking on the title bar in the next major release. Ditto for the compiler.

Large Code Size: We are investigating ways to shrink code size and hopefully will be addressing this in the next major release. It’s not unusual to expect a 3 to 1 expansion in any language from source to compiled form. However, I would like to see it reduced as much as possible. Sharing the runtime module with a number of programs can save 40K.

HFS: Major enhancements to the way HFS is handled in both the interpreter and compiler will be addressed in the next major release.

Undocumented features: TextEdit support was built-in to BASIC at the last minute mainly in response to one of your articles. It was too late to include in the manual but certainly will be documented further in the next revision of the manual. We would like to invite Dave Kelly and Dave Smith to discuss our future plans for MS Basic and to get any suggestions you have as to features you would like to see implemented. [We accept. Ok, gang, here is your chance! Send in your wish list on MS Basic and we will present them to Microsoft. -Ed]

Turbo Bug

Tim Votaw

Anaheim, CA

I stumbled across something recently that I can’t seem to figure out so I thought I’d pass it along to you and your readers. It seems that Turbo Pascal allows division by zero at compilation time and hence produces a nice system crash (ID 4) in your program, although the resume function seems to recover you.

[We checked this error in the latest Turbo Pascal copy, version 1.00D, just sent yesterday to our offices. While this new version is supposed to fix some bugs with the floating point routines, it does not fix this one. Here is the program:


{2}
program divbyzero;
{$U-}
{Turbo Pascal 1.00D version}
uses MemTypes, QuickDraw, OSIntf, ToolIntf, PasInOut, PasConsole;
var
 thenbr,zero:integer;
begin
 zero:=0;
 thenbr:=0 div zero; {this line compiles & executes ok!}
 writeln(thenbr);
 thenbr:=1 div zero; {causes system crash ID=04.}
 writeln(thenbr);
end.

When we ran this program, it compiles and executed! The first division by zero wrote “0” to the window, but the second one produced a system crash with ID 4. When we hit the resume button, Turbo then trapped the error and reported a division by zero error. We then compiled the program to disk and it also produced a nice stand alone application, that when executed, displays a nice system crash although the resume button returns to the Finder. The listing below is the same program in LS Pascal:


{3}
PROGRAM divbyzero;
{LS Pascal Version}
 VAR
 thenbr, zero : integer;
BEGIN
 showtext;{get default text window up}
 zero := 0;
 thenbr := 0 DIV zero; {This line won’t compile!}
 writeln(thenbr);
 thenbr := 1 DIV zero; 
 writeln(thenbr);
END.

We tried the same program in LS Pascal to see what it would do. The program correctly 
refused to compile at the first division by zero statement. We had to change zero to a 1 to 
get the program to compile and execute. Obviously, LS Pascal has better error checking 
at compile time. (See fig. 2) -Ed]

Fig. 2 Catching potential run-time errors
 

Community Search:
MacTech Search:

Software Updates via MacUpdate

BetterTouchTool 1.84 - Customize Multi-T...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
Dropbox 8.4.21 - Cloud backup and synchr...
Dropbox is an application that creates a special Finder folder that automatically syncs online and between your computers. It allows you to both backup files and keep them up-to-date between systems... Read more
OmniGraffle Pro 6.6.1 - Create diagrams,...
OmniGraffle Pro helps you draw beautiful diagrams, family trees, flow charts, org charts, layouts, and (mathematically speaking) any other directed or non-directed graphs. We've had people use... Read more
OmniGraffle 6.6.1 - Create diagrams, flo...
OmniGraffle helps you draw beautiful diagrams, family trees, flow charts, org charts, layouts, and (mathematically speaking) any other directed or non-directed graphs. We've had people use Graffle to... Read more
f.lux 37.7 - Adjusts the color of your d...
f.lux makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day. Ever notice how people texting at night have that eerie blue glow? Or wake... Read more
BBEdit 11.6.1 - Powerful text and HTML e...
BBEdit is the leading professional HTML and text editor for the Mac. Specifically crafted in response to the needs of Web authors and software developers, this award-winning product provides a... Read more
ScreenFlow 6.1 - Create screen recording...
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
Microsoft Office 2016 15.25 - Popular pr...
Microsoft Office 2016 - Unmistakably Office, designed for Mac. The new versions of Word, Excel, PowerPoint, Outlook and OneNote provide the best of both worlds for Mac users - the familiar Office... Read more
FileZilla 3.21.0 - Fast and reliable FTP...
FileZilla (ported from Windows) is a fast and reliable FTP client and server with lots of useful features and an intuitive interface. Version 3.21.0: Fixed Vulnerabilities Fixed a string format... Read more
Fantastical 2.2.5 - Create calendar even...
Fantastical 2 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... Read more

Pokemon GO update: Take me to your leade...
The Team Leaders in Pokemon GO have had it pretty easy up until now. They show up when players reach level 5, make their cases for joining their respective teams, and that's pretty much it. Light work, as Floyd Mayweather might say. [Read more] | Read more »
Ruismaker FM (Music)
Ruismaker FM 1.0 Device: iOS Universal Category: Music Price: $4.99, Version: 1.0 (iTunes) Description: Following up on the success of Ruismaker, here's her crazy twin-sister, designed for people who want to design their own... | Read more »
Space Marshals 2 (Games)
Space Marshals 2 1.0.15 Device: iOS iPhone Category: Games Price: $5.99, Version: 1.0.15 (iTunes) Description: The sci-fi wild west adventure in outer space continues with Space Marshals 2. This tactical top-down shooter puts you in... | Read more »
Dungeon Warfare (Games)
Dungeon Warfare 1.0 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0 (iTunes) Description: Dungeon Warfare is a challenging tower defense game where you become a dungeon lord to defend your dungeon against greedy... | Read more »
Solitairica (Games)
Solitairica 1.0.7 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.7 (iTunes) Description: Solitairica takes RPG combat and challenging rogue-like progression to a fresh new place—the world of solitaire! | Read more »
Bowmasters tips, tricks and hints
At least for this writer, archery was one of the more pleasant surprises of the 2016 Rio Olympics. As opposed to target shooting with guns, which was dreadfully boring, watching people shoot arrows at targets was pretty darn cool. [Read more] | Read more »
Best apps for watching live TV
The Olympics have come and gone, leaving nearly everyone in a temporary state of "What the heck am I going to watch on TV right now?" Besides old reruns of Golden Girls, but that goes without saying. [Read more] | Read more »
What is Flip Diving, and why has it take...
Move over Pokemon GO. There's a new king in town, and it's "the world's #1 cliff diving game." [Read more] | Read more »
5 places where Pokemon GO is still numbe...
In the U.S., the bloom is off the Pokemon Go rose ever so slightly. It's still doing great, sitting atop the top grossing chart as it has for some time, but it's no longer among the top 10 free apps in downloads, possibly because darn near... | Read more »
Madden NFL Mobile: How defense has chang...
Saying that defense is not a priority in Madden NFL Mobile is a bit of an understatement. In asynchronous head-to-head play, you don't take control of your defenders at all, as the AI manages them while your opponent plays offense. When it's your... | Read more »

Price Scanner via MacPrices.net

Apple refurbished 13-inch MacBook Airs availa...
Apple has Certified Refurbished 2016 and 2015 13″ MacBook Airs now available starting at $849. An Apple one-year warranty is included with each MacBook, and shipping is free: - 2016 13″ 1.6GHz/8GB/... Read more
Apple refurbished iPad mini 2s available for...
Apple is offering Certified Refurbished iPad mini 2s for up to $80 off the cost of new minis. An Apple one-year warranty is included with each model, and shipping is free: - 16GB iPad mini 2 WiFi: $... Read more
Save up to $600 with Apple refurbished Mac Pr...
Apple has Certified Refurbished Mac Pros available for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The following... Read more
Mac Pros on sale for $200 off MSRP
B&H Photo has Mac Pros on sale for $200 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: $3799, $200... Read more
Will We See A 10.5″ iPad Pro in 2017? – The ‘...
A MacRumors report, cites a research note from KGI Securities analyst Ming-Chi Kuo, saying a new size iPad model is in the works. According to the highly respected Cho, who has a strong track record... Read more
IOGEAR USB-C Docking Station Transforms Lapto...
IOGEAR has announced the launch of its innovative USB-C Docking Station with Power Delivery which turns USB-C enabled laptops into desktop workstations. The new IOGEAR USB-C Docking Station features... Read more
12-inch Retina MacBooks on sale for up to $10...
Amazon has 2016 12″ Apple Retina MacBooks on sale for $100 off MSRP. Shipping is free: - 12″ 1.1GHz Space Gray Retina MacBook: $1199 $100 off MSRP - 12″ 1.1GHz Silver Retina MacBook: $1224.99 $75 off... Read more
13-inch 2.5GHz MacBook Pro (Apple refurbished...
Apple has 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″ 2.5GHz MacBook Pros... Read more
21-inch iMacs on sale for up to $120 off MSRP
B&H Photo has 21″ iMacs on sale for up to $120 off MSRP including free shipping plus NY sales tax only: - 21″ 3.1GHz iMac 4K: $1379 $120 off MSRP - 21″ 2.8GHz iMac: $1199.99 $100 off MSRP - 21″ 1... Read more
Typinator 6.10 comes with 50 improvements – G...
Ergonis Software today announced release of Typinator 6.10, a new version of their text expander utility for macOS. Typinator 6.10 comes with 50 improvements, including new features, compatibility... Read more

Jobs Board

*Apple* Mobile Master - Best Buy (United Sta...
What does a Best Buy Apple Mobile Master do? At Best Buy, our mission is to leverage the unique talents and passions of our employees to inspire, delight, and enrich Read more
*Apple* Retail - Multiple Positions Akron, O...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Simply Mac *Apple* Specialist- Repair Techn...
…The Technician is a master at working with our customers to diagnose and repair Apple devices in a manner that exceeds the expectations set forth by Apple Read more
*Apple* Retail - Multiple Positions Germanto...
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* Professional Learning Specialist - A...
# Apple Professional Learning Specialist Job Number: 51234379 Portland, Maine, Maine, United States Posted: Aug. 18, 2016 Weekly Hours: 40.00 **Job Summary** The Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.