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.

 
AAPL
$102.50
Apple Inc.
+0.25
MSFT
$45.43
Microsoft Corpora
+0.55
GOOG
$571.60
Google Inc.
+2.40

MacTech Search:
Community Search:

Software Updates via MacUpdate

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
SlingPlayer Plugin 3.3.20.505 - Browser...
SlingPlayer is the screen interface software that works hand-in-hand with the hardware inside the Slingbox to make your TV viewing experience just like that at home. It features an array of... Read more
Get Lyrical 3.8 - Auto-magically adds ly...
Get Lyrical auto-magically add lyrics to songs in iTunes. You can choose either a selection of tracks, or the current track. Or turn on "Active Tagging" to get lyrics for songs as you play them.... Read more
Viber 4.2.2 - Send messages and make cal...
Viber lets you send free messages and make free calls to other Viber users, on any device and network, in any country! Viber syncs your contacts, messages and call history with your mobile device,... Read more
Cocktail 7.6 - General maintenance and o...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
LaunchBar 6.1 - Powerful file/URL/email...
LaunchBar is an award-winning productivity utility that offers an amazingly intuitive and efficient way to search and access any kind of information stored on your computer or on the Web. It provides... Read more
Maya 2015 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more

Latest Forum Discussions

See All

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 »
Dodo Master Review
Dodo Master Review By Jordan Minor on August 29th, 2014 Our Rating: :: NEST EGGiPad Only App - Designed for the iPad Dodo Master is tough but fair, and that’s what makes it a joy to play.   | Read more »
Motorsport Manager Review
Motorsport Manager Review By Lee Hamlet on August 29th, 2014 Our Rating: :: MARVELOUS MANAGEMENTUniversal App - Designed for iPhone and iPad Despite its depth and sense of tactical freedom, Motorsport Manager is one of the most... | Read more »
Motorsport Manager – Beginner Tips, Tric...
The world of Motorsport management can be an unforgiving and merciless one, so to help with some of the stress that comes with running a successful race team, here are a few hints and tips to leave your opponents in the dust. | Read more »
CalPal Update Brings the App to 2.0, Add...
CalPal Update Brings the App to 2.0, Adds Lots of New Stuff Posted by Ellis Spice on August 29th, 2014 [ permalink ] | Read more »

Price Scanner via MacPrices.net

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
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
A&D Medical Launches Its WellnessConnecte...
For consumers and the healthcare providers and loved ones who care for them, A&D Medical, a leader in connected health and biometric measurement devices and services, has launched its... Read more
Anand Lal Shimpi Retires From AnandTech
Anand Lal Shimpi, whose AnandTech Website is famous for its meticulously detailed and thoroughgoing reviews and analysis, is packing it in. Lal Shimpi, who founded the tech site at age 14 in 1997,... Read more
2.5GHz Mac mini, Apple refurbished, in stock...
The Apple Store has Apple Certified Refurbished 2.5GHz Mac minis available for $509, $90 off MSRP. Apple’s one-year warranty is included, and shipping is free. Read more
13-inch 2.5GHz MacBook Pro on sale for $999,...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $999.99 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Read more
Labor Day Weekend MacBook Pro sale; 15-inch m...
B&H Photo has the new 2014 15″ Retina MacBook Pros on sale for up to $125 off MSRP. Shipping is free, and B&H charges NY sales tax only. They’ll also include free copies of Parallels Desktop... Read more
Labor Day Weekend iPad mini sale; $50 to $100...
Best Buy has the iPad mini with Retina Display (WiFi models) on sale for $50 off MSRP on their online store for Labor Day Weekend. Choose free shipping or free local store pick up. Price is for... Read more
13-inch 1.4GHz MacBook Air on sale for $899,...
Adorama has the new 2014 13″ 1.4GHz/128GB MacBook Air on sale for $899.99 including free shipping plus NY & NJ tax only. Their price is $100 off MSRP. 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.