Re: SWARM Boids

[Marcus G. Daniels]

>>>>> "EW" == Eric Werk <address@hidden> writes:

EW> http://www.daimi.au.dk/~werk/swarm/boid/boid.tar.gz

Cool!  Here are few tweaks to avoid NULL pointer conditions,
and a buffer overrun:

diff -c -r boid/Polygon.m boid-new/Polygon.m
*** boid/Polygon.m      Wed Jun  2 11:47:49 1999
--- boid-new/Polygon.m  Wed Jun  2 13:12:25 1999
***************
*** 11,22 ****
    return [super createEnd];
  }
  
  - createItem
  {
    id <Index> index;
    id <Vector> vector;
    if ([vectorList getCount]>0) {
!     char eval[20 + [vectorList getCount]*5];
      
      index = [vectorList begin: [self getZone]];
      
--- 11,27 ----
    return [super createEnd];
  }
  
+ - createBindings
+ {
+    return self;
+ }
+ 
  - createItem
  {
    id <Index> index;
    id <Vector> vector;
    if ([vectorList getCount]>0) {
!     char eval[20 + [vectorList getCount]*(2 * (1 + 3)) + 1];
      
      index = [vectorList begin: [self getZone]];
      
***************
*** 33,39 ****
  
  - erase
  {
!   [globalTkInterp eval: "%s delete %s", [canvas getWidgetName], item];  
    return self;
  }
   
--- 38,45 ----
  
  - erase
  {
!   if (item)
!     [globalTkInterp eval: "%s delete %s", [canvas getWidgetName], item];  
    return self;
  }
   

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