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MacPerl-Digest V1 #15

To: macperl-digest@macperl.org
Subject: MacPerl-Digest V1 #15
From: owner-macperl-digest@macperl.org (MacPerl-Digest)
Date: Wed, 17 Mar 1999 05:00:08 -0800 (PST)

MacPerl-Digest        Wednesday, March 17 1999        Volume 01 : Number 015



[MacPerl] Overwriting only one line in a file
[MacPerl] 3D Ball
Re: [MacPerl] 3D Ball
Re: [MacPerl] 3D Ball
Re: [MacPerl] 3D Ball

----------------------------------------------------------------------

Date: Tue, 16 Mar 1999 20:38:45 +0000
From: "Paul S Gutches" <pixelrocket@earthlink.net>
Subject: [MacPerl] Overwriting only one line in a file

MacPerl wizards,

A newbie question for you.  I have been able to successfully read and
extract a specific piece of data from a file, but I'm not sure how I might
overwrite just that bit of information to update it.  How would one go about
doing that without rewriting the entire file?

Thank you as always for your knowledge and generosity.


Paul Gutches

mailto:webmaster@multimedia1.com
http://www.multimedia1.com
http://www.gametour.com

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------------------------------

Date: Tue, 16 Mar 1999 22:45:03 -0500
From: kpreid@ibm.net (Kevin Reid)
Subject: [MacPerl] 3D Ball

#!perl -w

# 3D Ball v2.0
# by Kevin Reid
#
# W, A, S and D and/or click & drag to rotate.
# + and - or control-drag to change scale.
# Tab key toggles polygon borders. 
# Escape key quits.
#
# Version History
# 2.0
#   * Added perspective, rotation & scaling
#   * Window now covers screen
#   * Changed name
#   * Added frames-per-second counter
# 1.0
#   * Initial release as "Isometric Ball"

use strict;
use Mac::Windows;
use Mac::QuickDraw;
use Mac::Events;
use Mac::Fonts qw(systemFont);
use Math::Trig qw(deg2rad);

use vars qw(
  $ScrnRect
  $Mods
  $GWindow
  %pos %oldpos %vel
  $tick
  @Polygons
  $ObscureRgn
  $otime $otick $ptick
  %Multipliers
  $frame_size
  $rot $pitch
  $distort
  $mouse
  $oldmouse
  $downflag
  $scale
);

use constant GRAV => 0.8;
use constant LOSS => 0.99;
use constant BOOSTVEL => 23;
use constant DISTORT => 700;

use constant BOXSIZE => 100;
use constant SYSTIME => 100;

use constant ROTSTEP => 360 / 64;
use constant PITCHSTEP => 360 / 64;

use constant C_EMPTY => new RGBColor (50000, 50000, 65535);
use constant C_BACKL => new RGBColor ((47000)x3);
use constant C_BACKR => new RGBColor ((50000)x3);
use constant C_BACKB => new RGBColor ((49000)x3);
use constant C_LINES => new RGBColor ((40000)x3);

BEGIN {
  $ScrnRect = GetMainDevice()->gdRect;
  $ScrnRect->top($ScrnRect->top + 20);
}
use constant WINSIZEH => $ScrnRect->right - $ScrnRect->left; #BOXSIZE *
3.5 + 1;
use constant WINSIZEV => $ScrnRect->bottom - $ScrnRect->top; #BOXSIZE *
3.5 + 1;
use constant WINRECT => new Rect (0, 0, WINSIZEH, WINSIZEV);

sub CalcRot {
  my $rotr = deg2rad($rot);
  my $pitr = deg2rad($pitch);
  %Multipliers = (
    'x' => {'x' => sin($rotr), 'y' => 0, 'z' => cos($rotr)},
    'y' => {'x' => cos($pitr) * cos($rotr), 'y' => sin($pitr), 'z' =>
cos($pitr) * -sin($rotr)},
    'z' => {'x' => -sin($pitr) * cos($rotr), 'y' => cos($pitr), 'z' =>
- -sin($pitr) * -sin($rotr)},
  );
  CalcPolys();
}

sub IsoFlatten {
  my ($x, $y, $z) = @_;

  my $rz = Rotate_Z(@_) + $distort;
 
  return (
    ($x * $Multipliers{'x'}{'x'} + $y * $Multipliers{'x'}{'y'} + $z *
$Multipliers{'x'}{'z'}) / $rz * $distort * $scale + WINSIZEH/2,
    ($x * $Multipliers{'y'}{'x'} + $y * $Multipliers{'y'}{'y'} + $z *
$Multipliers{'y'}{'z'}) / $rz * $distort * $scale + WINSIZEV/2,
  );
}

sub Rotate_Z {
  my ($x, $y, $z) = @_;

  return $x * $Multipliers{'z'}{'x'} + $y * $Multipliers{'z'}{'y'} + $z
* $Multipliers{'z'}{'z'};
}

sub DotAt {
  PenSize((2.5 * $scale) x 2);
  MoveTo(@_);
  LineTo(@_);
}

sub BallAt {
  my ($x, $y, $siz) = @_;

  $siz *= $scale;
  InvertOval(new Rect($x-$siz, $y-$siz, $x+$siz, $y+$siz));
}

sub DrawObject {
  my (%cd) = @_;
  SetClip($ObscureRgn);

  if ($cd{z} == 0) {
    BallAt(IsoFlatten(@cd{qw(x y z)}), 8);
  } else {
    BallAt(IsoFlatten(@cd{qw(x y z)}), 8 * $distort / (Rotate_Z(@cd{qw(x
y z)}) + $distort));
  }

  PenSize(2,2);
  DotAt(IsoFlatten(@cd{qw(x y)}, - BOXSIZE * .98));
  DotAt(IsoFlatten(- BOXSIZE * .98, (@cd{qw(y z)})));
  DotAt(IsoFlatten($cd{'x'}, - BOXSIZE * .98, $cd{z}));
  ClipRect(WINRECT);
}

sub GenPoly {
}

sub CalcPolys {

  my $poly;
  foreach (@Polygons) {
    KillPoly $_->{poly};
  }
  @Polygons = ();

  $poly = OpenPoly; # left poly
  MoveTo(IsoFlatten(- BOXSIZE, - BOXSIZE, - BOXSIZE));
  LineTo(IsoFlatten(- BOXSIZE, - BOXSIZE,   BOXSIZE));
  LineTo(IsoFlatten(- BOXSIZE,   BOXSIZE,   BOXSIZE));
  LineTo(IsoFlatten(- BOXSIZE,   BOXSIZE, - BOXSIZE));
  LineTo(IsoFlatten(- BOXSIZE, - BOXSIZE, - BOXSIZE));
  ClosePoly;
  push @Polygons, {poly => $poly, depth => Rotate_Z(- BOXSIZE, 0, 0),
color => C_BACKL};

  $poly = OpenPoly; # right poly
  MoveTo(IsoFlatten(- BOXSIZE, - BOXSIZE, - BOXSIZE));
  LineTo(IsoFlatten(- BOXSIZE,   BOXSIZE, - BOXSIZE));
  LineTo(IsoFlatten(  BOXSIZE,   BOXSIZE, - BOXSIZE));
  LineTo(IsoFlatten(  BOXSIZE, - BOXSIZE, - BOXSIZE));
  LineTo(IsoFlatten(- BOXSIZE, - BOXSIZE, - BOXSIZE));
  ClosePoly;
  push @Polygons, {poly => $poly, depth => Rotate_Z(0, 0, - BOXSIZE),
color => C_BACKR};

  $poly = OpenPoly; # bottom poly
  MoveTo(IsoFlatten(- BOXSIZE, - BOXSIZE, - BOXSIZE));
  LineTo(IsoFlatten(- BOXSIZE, - BOXSIZE,   BOXSIZE));
  LineTo(IsoFlatten(  BOXSIZE, - BOXSIZE,   BOXSIZE));
  LineTo(IsoFlatten(  BOXSIZE, - BOXSIZE, - BOXSIZE));
  LineTo(IsoFlatten(- BOXSIZE, - BOXSIZE, - BOXSIZE));
  ClosePoly;
  push @Polygons, {poly => $poly, depth => Rotate_Z(0, - BOXSIZE, 0),
color => C_BACKB};
  
  # use Data::Dumper; print Dumper \@Polygons;

  @Polygons = sort {$b->{depth} <=> $a->{depth}} @Polygons;
  DisposeRgn $ObscureRgn if $ObscureRgn;
  OpenRgn;
  FrameRect(WINRECT);
  foreach (@Polygons) {
    FramePoly($_->{poly}) if (!$_->{non}) and $_->{depth} < -15;
  }
  $ObscureRgn = CloseRgn;
  InsetRgn($ObscureRgn, 0, 0);

  InvalRect(WINRECT);
}

%pos    = ('x' => 0, 'y' => BOXSIZE - 10, 'z' => 0),
%oldpos = ('x' => 0, 'y' => BOXSIZE - 10, 'z' => 0),
%vel    = ('x' => rand 10, 'y' => 0, 'z' => rand 10),
$otime = 0; $otick = 0; $ptick = '';

$rot = 135;
$pitch = 225;
$frame_size = 1;
$distort = DISTORT;
$scale = 1;

CalcRot();
$mouse = GetMouse();

$GWindow = new MacColorWindow (
  $ScrnRect,
  'Ball',
  1, plainDBox, 1,
);
$GWindow->sethook(drawgrowicon => sub {});
$GWindow->sethook(click => sub {$Mods =
$Mac::Events::CurrentEvent->modifiers; $downflag = 1});
$GWindow->sethook(redraw => sub {
  PenMode(srcCopy);
  PenSize($frame_size,$frame_size);

  foreach (@Polygons) {
    RGBForeColor($_->{color});
    PaintPoly($_->{poly});
    RGBForeColor(C_LINES);
    FramePoly($_->{poly});
  }

  PenMode(srcXor);

  MoveTo(1, 10);
  DrawString($ptick);
  MoveTo(1, 22);
  DrawString("Rot: $rot");
  MoveTo(1, 34);
  DrawString("Tilt: $pitch");

  DrawObject(%pos);
});
$GWindow->sethook(key => sub {
  my ($win, $key) = @_;
  $key = lc chr $key;
  my $updt = 1;

  my $rs = ((abs $pitch % 360) > 180) ? ROTSTEP / $scale : - ROTSTEP /
$scale;
  &{{
    'a' => sub {$rot += $rs},
    'd' => sub {$rot -= $rs},
    'w' => sub {$pitch += PITCHSTEP / $scale},
    's' => sub {$pitch -= PITCHSTEP / $scale},
    "\t" => sub {$frame_size *= -1},
    "\c[" => sub {$GWindow->dispose},
    '+' => sub {$scale *= 1.1},
    '-' => sub {$scale /= 1.1},
  }->{$key} || sub {$updt = 0}};
  if ($updt) {
    CalcRot();
    $rot = $rot - 360 if $rot >= 360;
    $rot = $rot + 360 if $rot < 0;
    $pitch = $pitch - 360 if $pitch >= 360;
    $pitch = $pitch + 360 if $pitch < 0;
  }
});
SetPort $GWindow->window;
PenNormal;
RGBBackColor(C_EMPTY);
TextMode(srcXor);
TextFont(systemFont);

WaitNextEvent;
WaitNextEvent;
WaitNextEvent;

$tick = 0;
while ($tick++, $GWindow->window) {

  SetPort $GWindow->window;

  $oldmouse = $mouse;
  $mouse = GetMouse;
  if ($downflag) {
    if ($oldmouse->h != $mouse->h or $oldmouse->v != $mouse->v) {
      my $xdiff = $mouse->h - $oldmouse->h;
      my $ydiff = $mouse->v - $oldmouse->v;
      if ($Mods & controlKey) {
        $scale += $ydiff / 60;
        $scale = .1 if $scale < .1;
        $scale = 4 if $scale > 4;
      } else {
        if ((abs $pitch % 360) > 180) {$rot -= ($xdiff) * .5}
                                 else {$rot += ($xdiff) * .5}
        $pitch -= ($ydiff) * .5;
      }
      $rot = $rot - 360 if $rot >= 360;
      $rot = $rot + 360 if $rot < 0;
      $pitch = $pitch - 360 if $pitch >= 360;
      $pitch = $pitch + 360 if $pitch < 0;
      CalcRot();
    }
    $downflag = Button();
  }

  foreach (qw(x y z)) {
    my $did = 0;

    $oldpos{$_} = $pos{$_};
    $pos{$_} += $vel{$_};
    if ($pos{$_} < - BOXSIZE +9) {
      $vel{$_} *= - LOSS;
      $pos{$_} = - BOXSIZE +9;
      $did = 1;
    }
    if ($pos{$_} > BOXSIZE -9) {
      $vel{$_} *= - LOSS;
      $pos{$_} = BOXSIZE -9;
    #  $did = 1;
    }
    if ($did and abs($vel{$_}) < 1) {
      $vel{$_} = BOOSTVEL;
    } 
  }

  DrawObject(%oldpos);
  DrawObject(%pos);

  $vel{'y'} -= GRAV;

  if ($otime != time) {
    $otime = time;
    MoveTo(1, 10);
    DrawString($ptick);
    $ptick = 'FPS: ' . ($tick - $otick);
    MoveTo(1, 10);
    DrawString($ptick);
    $otick = $tick;
  }

  WaitNextEvent unless $tick % (101 - SYSTIME);
}

END {
  $GWindow->dispose if $GWindow;
}
__END__

- -- 
 Kevin Reid: |    Macintosh:      
  "I'm me."  | Think different.
    

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------------------------------

Date: Tue, 16 Mar 1999 23:08:30 -0500
From: Chris Nandor <pudge@pobox.com>
Subject: Re: [MacPerl] 3D Ball

Very very cool.  When I get some time I'll have to dissect it and figure it
out.  :)

- --
Chris Nandor          mailto:pudge@pobox.com         http://pudge.net/
%PGPKey = ('B76E72AD', [1024, '0824090B CE73CA10  1FF77F13 8180B6B6'])

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------------------------------

Date: Wed, 17 Mar 1999 08:27:01 +0000
From: "Jay Bedsole" <rwdd30@email.sps.mot.com>
Subject: Re: [MacPerl] 3D Ball

Most excellent!

I was impressed when I accidentally found I could rotate
the box or change my perspective or whatever...

Totally cool!

jay

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------------------------------

Date: Wed, 17 Mar 1999 18:21:50 +0900
From: riechert@pobox.com (Andreas Marcel Riechert)
Subject: Re: [MacPerl] 3D Ball

Cool!...I am deeply impressed.
Moving to Tokyo , I just didn`t had the time to "play"
with MacPerl. I think this demo brought me back to MacPerl.
Thanks.
Well done.

Andreas


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End of MacPerl-Digest V1 #15
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