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Array length methods (Read 4593 times)
st33d
Array length methods
Jun 11th, 2005, 10:10pm  
The new array controls are very handy (expand, concat, etc.).

I am aware that these do not work with objects (homemade Classes). It gives me the impression that System.arraycopy() is not employed in these operations. So I imagine there is some other expedient method (I've lost the link to the API source, sorry).

Is there any plan to extend array length handling to objects? With the same or different functions perhaps. Or should we stick to arraycopy and java's vectors?

I ask because I think you guys would have the better experience of what's best in terms of a student's development.
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mflux
Re: Array length methods
Reply #1 - Jun 13th, 2005, 5:31am  
I usually do something like this

Code:

thing thingArray[]; 
 
void setup() 
{ 
  size(100,100); 
  thingArray=new thing[200]; 
  for(int i=0;i<thingArray.length;i++) 
    thingArray[i]=new thing(); 
} 
void draw() 
{ 
 
} 
class thing 
{ 
  float data; 
  thing() 
  {} 
  thing(thing t) 
  { 
    this.data=t.data; 
  } 
} 
 
thing[] append(thing t[],thing newThing) 
{ 
  thing temp[]=new thing[t.length+1]; 
  System.arraycopy(t,0,temp,0,t.length); 
  temp[t.length]=new thing(newThing); 
  return temp; 
}


For every custom class I make. Yeah, it's a bit tedious. Someone smarter might come up with a universal "appendage".
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fluxhavoc  
fry
Re: Array length methods
Reply #2 - Jun 13th, 2005, 3:22pm  
yup, universal versions are coming soon...

see also: http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Suggestions;action=display;num=1114443601;start=0
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fry
Re: Array length methods
Reply #3 - Jul 28th, 2005, 5:54pm  
status of this can now be tracked in the bugs db:
http://dev.processing.org/bugs/show_bug.cgi?id=115
(closing thread, please do any follow-up there)
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