Processing 1.0 - Processing Discourse - Arrays and Instantiation

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Arrays and Instantiation (Read 440 times)

Paulo Barbeiro

Arrays and Instantiation
Feb 6^th, 2010, 3:56pm

Hi all,

I am facing a problem here.
I am working at a project where i need to instantiate some objects dynamically, and to keep every thing organized, insert them in an array.

Here is my simplified code:

Code:


Plant[] myPlants = new Plant[1];

void setup(){
     size(200,200);
     PVector loc = new PVector(100,100);
     myPlants[0] = new Plant(loc, 1000, 10, 1);
}

void draw(){
     for(int i=0 ; i<plants.length ; i++){
          if (myPlants[i] != null) myPlants[i].live();
     }
}

well...
To solve the problem I've created a function in the main file, that is been called by the myPlants's instances, and inside this function... I was trying to use the function apped(), but it's not working:

Code:


void instantiateNewPlant(PVector p, int temp, float ener, float forc){
     Plant plt = new Plant(p, temp, ener, forc);
     myPlants = append(myPlants, plt);
}

... and I am receiving this error: "cannot convert from Object to ecologia.Plant[]"

Does someone know why? Does the append() function works with non native objects?

Thanks guys!

Paulo

subpixel

Re: Arrays and Instantiation
Reply #1 - Feb 6^th, 2010, 5:13pm

The append() documentation includes the following information:

Quote:

When using an array of objects, the data returned from the function must be cast to the object array's data type. For example: SomeClass[] items = (SomeClass[]) append(originalArray, element).

So you will need something like...

Code:

void instantiateNewPlant(PVector p, int temp, float ener, float forc){
     Plant plt = new Plant(p, temp, ener, forc);
     myPlants = (Plant[]) append(myPlants, plt);
}

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