ftp.nice.ch/pub/next/tools/screen/backspace/old/Lizard.N.bs.tar.gz#/Lizard/LizardViewPart.m

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#import "LizardViewPart.h"
#import <Thinker.h>
#import <appkit/NXImage.h>
#import <appkit/Panel.h>                // for NXRunAlertPanel()
#import <dpsclient/wraps.h>
#import <libc.h>
#import <math.h>

@implementation LizardView

- oneStep
{
  p=n; n=(n+1)%(NUMLINES-1);
  erase=(n-(NUMLINES*.9)); if(erase<0) erase+=(NUMLINES-1);
  if(n>(NUMLINES-1))n=0;
  
  t1[n]=t1[p]+0.008; if(t1[n]>(2*PI)) t1[n]-=(2*PI);
  t2[n]=t2[p]+0.01; if(t2[n]>(2*PI)) t2[n]-=(2*PI);
  
  t3[n]=t3[p]+0.02; if(t3[n]>(2*PI)) t3[n]-=(2*PI);
  t4[n]=t4[p]+0.009; if(t4[n]>(2*PI)) t4[n]-=(2*PI);
  
  t5[n]=t5[p]+0.01; if(t5[n]>(2*PI)) t5[n]-=(2*PI);
  t6[n]=t6[p]+0.01; if(t6[n]>(2*PI)) t6[n]-=(2*PI);
  
  t-=0.3; if(t<0)t+=(2*PI);
  
  x1[n]=(cos(t1[n])*(s1))+midx;
  yc1[n]=(sin(t2[n])*(s2))+midy;
  x2[n]=(cos(t3[n])*(s1))+midx;
  y2[n]=(sin(t4[n])*(s2))+midy;
  x3[n]=(cos(t5[n])*(s1))+midx;
  y3[n]=(sin(t6[n])*(s2))+midy;

  PSsetrgbcolor(0.0,0.0,0.0);
  PSmoveto(x1[erase], yc1[erase]); PSlineto(x2[erase], y2[erase]);
  PSmoveto(x2[erase], y2[erase]);  PSlineto(x3[erase], y3[erase]);
  PSmoveto(x3[erase], y3[erase]);  PSlineto(x1[erase], yc1[erase]);
  PSstroke();


  if ([self shouldDrawColor])
  PSsetrgbcolor((cos(t1[n])+1.0)/2.0,
                (cos(t3[n])+1.0)/2.0,
                (cos(t5[n])+1.0)/2.0);
  else PSsetrgbcolor(1.0, 1.0, 1.0);
  PSmoveto(x1[n], yc1[n]); PSlineto(x2[n], y2[n]);
  PSmoveto(x2[n], y2[n]);  PSlineto(x3[n], y3[n]);
  PSmoveto(x3[n], y3[n]);  PSlineto(x1[n], yc1[n]);
  PSstroke();

  return self;
}

- initFrame:(NXRect *)frameRect
{
	[super initFrame:frameRect];
	[self newSize];
	return self;
}

- sizeTo:(NXCoord)width :(NXCoord)height
{
	[super sizeTo:width :height];
	[self newSize];
	return self;
}

- newSize
{
  urx=bounds.size.width;
  ury=bounds.size.height;
  
  midx=urx/2;
  midy=ury/2;

  n = 0;
  t = 0;
  
  // phases of the three points;
  p1=0;
  p2=(4*PI)/3;
  p3=(2*PI)/3;
  
  // starting angle of each point;
  t1[0]=0;
  t2[0]=p2;
  t3[0]=p3;
  
  s1 = midx; s2 = midy;

  return self;
}

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.