TweetFollow Us on Twitter

TML Pascal Tricks
Volume Number:6
Issue Number:3
Column Tag:Pascal Procedures

TML Pascal Tricks

By Paul Diegenbach, Amsterdam, the Netherlands

XCMD - drawing in a Hypercard stack

The attractiveness of Hypercard is for a large part due to it graphical possibilities. Nice cards always mean nice graphics. The Hypertalk language allows drawing on the screen under program control. When we tear the tools menu off the menubar, we can actually see the actions as the tools flop from pen to brush to marquee and so on. Nice to watch, but oh so slow. Ever tried to draw a complicated graph in Hypercard? I tried it in an attempt to simulate the differentiation of an egg to all the different cells an embryo consists of. One of the theories implies the evaluation of some differential equations and then drawing a thousand points on the screen.

The idea was to let students be able to change the parameters in the equations and see the results in a user-friendly environment. The first step was to implement the equation solving in Hypertalk. Too slow, so an XCMD was quickly written. Drawing the results by Hypertalk: still to slow, so why not do the drawing in the XCMD as well? In a first result the drawing looks nice, but as soon as Hypercard updates the screen from its offscreen bitmap, the drawing disappears. The solution to this problem is to copy the drawing in the paste buffer (scrap) and paste it into Hypercard using the paste command from the menu. This combination works fine and quick. The skeleton for the XCMD is given below, in TML-Pascal, with a Fourier-demo in the drawing part to make it less dumb. In this demo we use parameters from Hypercard for the size of the rectangle and for the Fourier coefficients. Although not necessary, it is often handy to give the rectangle parameters. They can easily be estimated by having a temporary field of the same size and asking in the message window ‘put the size of card field tmp into msg’. The Hypercard stack with this demo implemented is on the source disk for this month.

To avoid flicker between the copy and paste, it is convenient to lock the screen before the XCMD is used. Users of other Pascals sometimes need to remove the ParamPtr parameter, that is the first parameter in every call to the glue routines:

{1}

UNIT PictToScrp;
(******************************************************      
This XCMD demodnstrates a method to plot and calculate in Pascal (perhaps 
with floating point processor enabled) and then copy and paste the picture 
in the card compile and link as follows (assuming Fourier is an existing 
stack):
  
  TMLPascal Fourier.p
or:  ( really fast on a mac II)
  TMLPascal Fourier.p  -MC68020 -MC68881 -d Elems881=true

  Link -w -t ‘STAK’ -c ‘WILD’ 
  -m FOURIER -rt XCMD=1282 -sg Fourier 
   Fourier.p.o 
   “{Libraries}”Runtime.o 
   “{Libraries}”Interface.o 
   “{TMLPLibraries}”TMLPasLib.o 
   “{Libraries}”HyperXLib.o 
   -o “Fourier”

 Hypercard call :
  set the lockscreen to true
  -- prevents flicker
  Fourier  330,14,480,319,10,7,5,3,4
  -- 330,14,480 is the area to draw into
  -- 10,7,5,3,4  are the fourier factors times 10
  set the lockscreen to false
 ******************************************************)

INTERFACE

  USES MemTypes, QuickDraw, OSIntf, ToolIntf, PackIntf, PasLibIntf, HyperXCMD;

  PROCEDURE Fourier(ParamPtr: XCMDPtr);

IMPLEMENTATION

  PROCEDURE PictScrap(ParamPtr: XCMDPtr); FORWARD;

  PROCEDURE Fourier(ParamPtr: XCMDPtr);
    BEGIN
      PictScrap(ParamPtr);
    END;

  PROCEDURE PictScrap(ParamPtr: XCMDPtr);
    VAR
      thePoint     : Point;
      hPicture     : PicHandle;
      rg           : rect;
      Piclength    : LONGINT;
      xoffset, yoffset: integer;
      str          : str255;
      xLeft, bot, top, xRight: LONGINT;
      one, two, three, four, five: LONGINT;
      x, y         : extended;
      z1, z2, z3, z4, z5: extended;

PROCEDURE MyDrawing;
 { all your drawing stuff goes here }
      VAR
        i            : integer;
        maxim, offset: extended;

      FUNCTION Sinus(x: extended): extended;
        BEGIN
          Sinus := sin(x) * z1 + sin(2 * x) * z2 + sin(3 * x) * z3 + 
sin(4 * x)  * z4 + sin(5 * x) * z5
 { the more, the better }
        END;

      BEGIN
        eraserect(rg);
        Framerect(rg); { optional }
        offset := top + (bot - top) / 2.0;
        z1 := one / 10.0;
        z2 := two / 10.0;
        z3 := three / 10.0;
        z4 := four / 10.0;
        z5 := five / 10.0;
        x := 0.02 {1 / 50} ;
        maxim := Sinus(x);
        FOR i := 2 TO 314 DO
          BEGIN
          IF i MOD 10 = 0 THEN
SendCardMessage(ParamPtr, ‘set cursor to busy’);
          x := i / 50;
          y := Sinus(x);
          IF maxim < y THEN
            maxim := y;
          END;

        x := 1 / 50;
        y := Sinus(x);
        maxim := 100 / maxim;
SendCardMessage(ParamPtr, ‘set cursor to busy’);
        moveto(xLeft + 1, round(y * maxim + offset));
        FOR i := 2 TO 314 DO
          BEGIN { for two pi }
          x := i / 50;
          y := Sinus(x);
lineto(i + xLeft + 1, round(y * maxim + offset))
          END;
SendCardMessage(ParamPtr, ‘set cursor to busy’);
        penpat(ltgray);
        moveto(xLeft + 1, round(offset));
        lineto(xRight - 2, round(offset));
        pennormal
      END;

    FUNCTION GetParameter(n: integer): LONGINT;
      VAR
        tmp          : LONGINT;
      BEGIN
        ZeroToPas(ParamPtr, ParamPtr^.params[n]^, str);
        stringToNum(str, tmp);
        GetParameter := tmp
      END;

    BEGIN
      IF ParamPtr^.paramCount <> 9 THEN
        SendCardMessage(ParamPtr, ‘put “wrong number of parameters” into 
msg’)
{ I think a more convenient way of error report than by ParamPtr^.ReturnValue 
}
      ELSE
        BEGIN
{get the drawing rectangle coordinates from hypercard }
        xLeft := GetParameter(1);
        top := GetParameter(2);
        xRight := GetParameter(3);
        bot := GetParameter(4);

{ In this example : get Fourier coëfficients from hypercard }
        one := GetParameter(5);
        two := GetParameter(6);
        three := GetParameter(7);
        four := GetParameter(8);
        five := GetParameter(9);
        setrect(rg, xLeft, top, xRight, bot);
        xoffset := xLeft + 5;
        yoffset := top + 5;
        cliprect(rg);
        hPicture := OpenPicture(rg);
        Showpen;
        MyDrawing; { here all your drawing }
        closepicture;
        Piclength := GethandleSize(handle(hPicture));
        IF ZeroScrap + putscrap(Piclength, ‘PICT’, ptr(hPicture^)) = 
NoErr THEN
     ParamPtr^.ReturnValue := PasToZero(ParamPtr, ‘’)
        ELSE
          ParamPtr^.ReturnValue := PasToZero(ParamPtr, ‘something wrong’);
SendCardMessage(ParamPtr, ‘choose select tool’);
SendCardMessage(ParamPtr, ‘domenu “Paste Picture”’);
SendCardMessage(ParamPtr, ‘choose browse tool’);
        END
    END;
END.

Small and Dirty “Write Always”

In the debugging of large programs we were accustomed to put a lot of ‘writeln’s’ in the source text to show what was happening. Although a workable solution on mainframes and mini’s, that’s not so easy in the Macintosh environment, there is not always a window available to write in. The following small subroutine (TML Pascal version) does the trick with some disadvantage: it overwrite all its lines on top of each other at the bottom of the screen in some kind of status line (bit like Online companion), but, sorry, the line is not automatically removed after leaving the program. Dirty isn’t it, so surely for debugging only. An ‘invalrect’ after each multifinder event and at the end of the program is sometimes a solution.

In the program source you write something like :

--2

 if dbg then DQText(‘now in procedure blahblah’)

(The clever one’s can write a MPW-script to put it after the first begin in every procedure or function) Dbg is used as a constant (or in a compiler directive).

The procedure (as a Pascal unit) looks like :

{3}

UNIT DQTextProcedure;
  INTERFACE
    USES
MemTypes, QuickDraw, OSIntf, ToolIntf, PackIntf, QDaccess;
 
{ Tml pascals QDaccess defines:
 TYPE  QDGlobalsPtr = ^QDGlobalsRec;
    QDGlobalsRec =
      record
        randSeed   :  LongInt;
        screenBits :  BitMap;
        arrow      :  Cursor;
        dkGray     :  Pattern;
        ltGray     :  Pattern;
        gray       :  Pattern;
        black      :  Pattern;
        white      :  Pattern;
        ThePort    :  GrafPtr;
      end;
function QDGlobals: QDGlobalsPtr;external;}

PROCEDURE DQText(Message: Str255);
  IMPLEMENTATION
PROCEDURE DQText(Message: Str255);
VAR
  SavedPort    : GrafPtr;
  LocalPort    : GrafPort;
  TheRect      : Rect;
BEGIN
  WITH QDGlobals^ DO
    BEGIN
      GetPort(SavedPort);
      OpenPort(@LocalPort);
      SetPort(@LocalPort);
      WITH ScreenBits.Bounds DO
 { this is QDGlobals^ s ScreenBits ! }
SetRect(TheRect, Left, Bottom-20, Right, Bottom);
      FillRect(TheRect, White);
      MoveTo(TheRect.Left, TheRect.Top);
      LineTo(TheRect.Right, TheRect.Top);
      MoveTo(TheRect.Left+7, TheRect.Bottom-7);
      DrawString(Message);
      ClosePort(@LocalPort);
      SetPort(SavedPort);
   END;
END;
END.

PROGRAM tstDQtext;
  { test the dqtext procedure : }
  USES MemTypes, QuickDraw, OSIntf, ToolIntf, PackIntf,
    PaslibIntf, QDaccess, DQtext;
  (*
  link as :
    Link  -t ‘APPL’ -c ‘????’ 
      DQtext.p.o 
      tstDQtext.p.o 
      “{Libraries}”Runtime.o 
      “{Libraries}”Interface.o 
      “{TMLPLibraries}”TMLPasLib.o 
      -o tstDQtext
  *)
  BEGIN
    textbook(NIL); { TML pascal simple window }
    writeln(‘ see bottom line’);
    writeln(‘ click mouse button’);
    PLFlush(output);
    DQtext(‘before’);
    REPEAT
    UNTIL button;
    DQtext(‘after mouse button’);
    writeln(‘ type return to end program’);
    readln
  END.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Adobe Creative Cloud 4.0.0.185 - Access...
Adobe Creative Cloud costs $19.99/month for a single app, or $49.99/month for the entire suite. Introducing Adobe Creative Cloud desktop applications, including Adobe Photoshop CC and Illustrator CC... Read more
Default Folder X 5.1.4 - Enhances Open a...
Default Folder X attaches a toolbar to the right side of the Open and Save dialogs in any OS X-native application. The toolbar gives you fast access to various folders and commands. You just click on... Read more
Amazon Chime 4.1.5587 - Amazon-based com...
Amazon Chime is a communications service that transforms online meetings with a secure, easy-to-use application that you can trust. Amazon Chime works seamlessly across your devices so that you can... Read more
Persecond 1.0.9 - Timelapse video made e...
Persecond is the easy, fun way to create a beautiful timelapse video. Import an image sequence from any camera, trim the length of your video, adjust the speed and playback direction, and you’re done... Read more
CrossOver 16.2 - Run Windows apps on you...
CrossOver can get your Windows productivity applications and PC games up and running on your Mac quickly and easily. CrossOver runs the Windows software that you need on Mac at home, in the office,... Read more
MegaSeg 6.0.2 - Professional DJ and radi...
MegaSeg is a complete solution for pro audio/video DJ mixing, radio automation, and music scheduling with rock-solid performance and an easy-to-use design. Mix with visual waveforms and Magic... Read more
Apple iTunes 12.6 - Play Apple Music and...
Apple iTunes lets you organize and stream Apple Music, download and watch video and listen to Podcasts. It can automatically download new music, app, and book purchases across all your devices and... Read more
GraphicConverter 10.4 - $39.95
GraphicConverter is an all-purpose image-editing program that can import 200 different graphic-based formats, edit the image, and export it to any of 80 available file formats. The high-end editing... Read more
OpenEmu 2.0.5 - Open Source game-emulati...
OpenEmu is about to change the world of video game emulation, one console at a time... For the first time, the 'It just works' philosophy now extends to open source video game emulation on the Mac.... Read more
beaTunes 4.6.13 - Organize your music co...
beaTunes is a full-featured music player and organizational tool for music collections. How well organized is your music library? Are your artists always spelled the same way? Any R.E.M. vs REM?... Read more

The Elder Scrolls: Legends is now availa...
| Read more »
Ticket to Earth beginner's guide: H...
Robot Circus launched Ticket to Earth as part of the App Store's indie games event last week. If you're not quite digging the space operatics Mass Effect: Andromeda is serving up, you'll be pleased to know that there's a surprising alternative on... | Read more »
Leap to victory in Nexx Studios new plat...
You’re always a hop, skip, and a jump away from a fiery death in Temple Jump, a new platformer-cum-endless runner from Nexx Studio. It’s out now on both iOS and Android if you’re an adventurer seeking treasure in a crumbling, pixel-laden temple. | Read more »
Failbetter Games details changes coming...
Sunless Sea, Failbetter Games' dark and gloomy sea explorer, sets sail for the iPad tomorrow. Ahead of the game's launch, Failbetter took to Twitter to discuss what will be different in the mobile version of the game. Many of the changes make... | Read more »
Splish, splash! The Pokémon GO Water Fes...
Niantic is back with a new festival for dedicated Pokémon GO collectors. The Water Festival officially kicks off today at 1 P.M. PDT and runs through March 29. Magikarp, Squirtle, Totodile, and their assorted evolved forms will be appearing at... | Read more »
Death Road to Canada (Games)
Death Road to Canada 1.0 Device: iOS Universal Category: Games Price: $7.99, Version: 1.0 (iTunes) Description: Get it now at the low launch price! Price will go up a dollar every major update. Update news at the bottom of this... | Read more »
Bean's Quest Beginner's Guide:...
Bean's Quest is a new take on both the classic platformer and the endless runner, and it's free on the App Store for the time being. Instead of running constantly, you can't stop jumping. That adds a surprising new level of challenge to the game... | Read more »
How to rake in the cash in Bit City
Our last Bit City guide covered the basics. Now it's time to get into some of the more advanced techniques. In the later cities, cash flow becomes much more difficult, so you'll want to develop some strategies if you want to complete each level.... | Read more »
PixelTerra (Games)
PixelTerra 1.1.1 Device: iOS Universal Category: Games Price: $.99, Version: 1.1.1 (iTunes) Description: The world of PixelTerra is quite dangerous so you need to build a shelter, find some food supply and get ready to protect... | Read more »
Tokaido™ (Games)
Tokaido™ 1.0 Device: iOS Universal Category: Games Price: $6.99, Version: 1.0 (iTunes) Description: Discover the digital adaptation of Tokaido, the boardgame phenomenon that has already sold more than 250,000 copies worldwide, and... | Read more »

Price Scanner via MacPrices.net

SSD Speeder RAM Disk SSD Life Extender App Fo...
Fehraltorf, Switzerland based B-Eng has announced they are making their SSD Speeder app for macOS publicly available for purchase on their website. SSD Speeder is a RAM disk utility that prevents... Read more
iPhone Scores Highest Overall in Smartphone D...
Customer satisfaction is much higher among smartphone owners who use their device to operate other connected home services such as smart thermostats and smart appliances, according to the J.D. Power... Read more
Swipe CRM Free Photo-Centric CRM Sales DEal C...
Swipe CRM LLC has introduced Swipe CRM: Visual Sales 1.0 for iPad, an app for creating, managing, and sharing visually stunning sales deals. Swipe CRM is targeted to small-and-medium creative... Read more
13-inch 2.0GHz Apple MacBook Pros on sale for...
B&H has the non-Touch Bar 13″ 2.0GHz MacBook Pros in stock today and on sale for $150 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.0GHz MacBook Pro Space Gray (... Read more
15-inch Touch Bar MacBook Pros on sale for up...
B&H Photo has the new 2016 15″ Apple Touch Bar MacBook Pros in stock today and on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.7GHz Touch Bar... Read more
Apple’s iPhone 6s Tops Best-Selling Smartphon...
In terms of shipments, the iPhone 6s from Apple bested all competitors for sales in 2016, according to new analysis from IHS Markit, a world leader in critical information, analytics and solutions.... Read more
Logitech Rugged Combo Protective iPad Case an...
Logitech has announced its Logitech Rugged Combo, Logitech Rugged Case, and Logitech Add-on Keyboard for Rugged Case for Apple’s new, more affordable $329 9.7-inch iPad, a complete solution designed... Read more
T-Mobile To Offer iPhone 7 and iPhone 7 Plus...
T-Mobile has announced it will offer iPhone 7 and iPhone 7 Plus (PRODUCT)RED Special Edition in a vibrant red aluminum finish. The introduction of this special edition iPhone celebrates Apple’s 10... Read more
9-inch 128GB iPad Pros on sale for $50-$70 of...
B&H Photo has 9.7″ 128GB Apple WiFi iPad Pros on sale for up to $70 off MSRP, each including free shipping. B&H charges sales tax in NY only: - 9″ Space Gray 128GB WiFi iPad Pro: $649 $50... Read more
27-inch iMacs on sale for up to $200 off MSRP...
B&H Photo has 27″ Apple iMacs on sale for up to $200 off MSRP, each including free shipping plus NY sales tax only: - 27″ 3.3GHz iMac 5K: $2099 $200 off MSRP - 27″ 3.2GHz/1TB Fusion iMac 5K: $... Read more

Jobs Board

*Apple* macOS Systems Integration Administra...
…most exceptional support available in the industry. SCI is seeking an Junior Apple macOS systems integration administrator that will be responsible for providing 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
Director, *Apple* Program - ERP & Cloud...
Leading Pharmaceutical / Biotech Company is announcing a Director, Apple Program - ERP & Cloud Platform Architecture Lead opportunity in Northbrook, IL. Purpose & Read more
Fulltime aan de slag als shopmanager in een h...
Ben jij helemaal gek van Apple -producten en vind je het helemaal super om fulltime shopmanager te zijn in een jonge en hippe elektronicazaak? Wil jij werken in Read more
Starte Dein Karriere-Abenteuer in den Hauptst...
…mehrsprachigen Teams betreust Du Kunden von bekannten globale Marken wie Apple , Mercedes, Facebook, Expedia, und vielen anderen! Funktion Du wolltest schon Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.