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Index › Programming Questions & Help › Syntax Questions › How create a Pimage list
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How create a Pimage list? (Read 590 times)
chemicalweb
How create a Pimage list?
Jul 13th, 2007, 7:45pm  
hi community...!
I try to build a class where is a PImage var that contains the pointer of Image.. but return this error:
Code:

java.lang.NullPointerException

at Temporary_9605_3973.draw(Temporary_9605_3973.java:17)

at processing.core.PApplet.handleDisplay(PApplet.java:1355)

at processing.core.PGraphics.requestDisplay(PGraphics.java:564)

at processing.core.PApplet.run(PApplet.java:1450)

at java.lang.Thread.run(Thread.java:613)

java.lang.NullPointerException

at Temporary_9605_3973.draw(Temporary_9605_3973.java:17)

at processing.core.PApplet.handleDisplay(PApplet.java:1355)

at processing.core.PGraphics.requestDisplay(PGraphics.java:564)

at processing.core.PApplet.run(PApplet.java:1450)

at java.lang.Thread.run(Thread.java:613)

Where is the problem?

this is the script:
Code:

listImg[] lista;
int xy = 0;
void setup()
{
  size(800,600, P3D);

  for(int x=0;x<5;x++)
  {
    lista = new listImg[x];
  }
}
 
void draw(){
  background(0);

  for(int i=0;i<5;i++){
    lista[i].draw();
    xy +=10;
  }
}
 
class listImg{
  
  private PImage img;
  listImg(int alfa){
    img = loadImage(alfa+".jpg");
    println("LOAD : "+alfa+".jpg");
  }
 
  void draw(){
    xy += 10;
    image(this.img,xy,xy);
  }   
}
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JohnG
Re: How create a Pimage list?
Reply #1 - Jul 13th, 2007, 8:05pm  
You've got your syntax wrong. I think what you want is:

Code:
 listImg[] lista;
int xy = 0;
void setup()
{
  size(800,600, P3D);
  lista = new listImage[5]; //lista is an array of 5 PImages. 
  for(int x=0;x<5;x++)
  {
    lista[x] = new listImg(x);
  }
}
 
void draw(){
  background(0);
 
  for(int i=0;i<5;i++){
    lista[i].draw();
    xy +=10;
  }
}
 
class listImg{
   
  private PImage img;
  listImg(int alfa){
    img = loadImage(alfa+".jpg");
    println("LOAD : "+alfa+".jpg");
  }
 
  void draw(){
    xy += 10;
    image(this.img,xy,xy);
  }    
}
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chemicalweb
Re: How create a Pimage list?
Reply #2 - Jul 13th, 2007, 8:35pm  
:S Ops....

thanks
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