Processing Forum

Access to an object via a LinkedList

[2 Replies]
- 22-Oct-2012 08:21 AM
- Forum: Programming Questions
Hi,

I am currently facing a problem with LinkedList and more specially get an attribute from an object

This is the declaration of the class AMORCE which is define in the variable.pde file :
1. public class AMORCE{
3. public float [][] tableauDePoint;
4. public int nombrePoint;
5. public int choixTransformation;
6. public public UNPOINT centreTransformation;
7. public AMORCE(){
8. this.choixTransformation = 0;
9. this.nombrePoint = nombrePointBase;
10. this.centreTransformation.x=0;
11. this.centreTransformation.y=0;
12. }
14. public UNPOINT getCenter(){
15. return centreTransformation;
16. }
18. }
20. public LinkedList lesAmorces;
23. public class UNPOINT{
24. public int x;
25. public int y;
26. public boolean arrete = false;
27. }
This is the instanciation of the LinkedList in the void setup:
1. lesAmorces= new LinkedList();
2. lesAmorces.add(new AMORCE());
So I create a LinkedList lesAmorces which contained an object AMORCE....

And finally this is the line with the error in the draw function:
1. lesAmorces.getLast().getCenter().x = xCen; //getLast return the last object of the LinkedList
2. lesAmorces.getLast().centreTransformation.y = yCen;
To sum up, I want to get and set the x and y coordinates of the object AMORCE which is contained in the LinkedList lesAmorces.

How to do this and why I get the error "The function getcenter() does not exist"?

I try to cast my variables like this:
temp = lesAmorces.getLast();

((AMORCE)temp).setCenter((int)xCen, (int)yCen);
... but it doesn't work and I get the error: "cannot converted from object to UNPOINT?

Thank in advance for your answers :-)

Try/Catch to avoid an array index out of bounds exception

[7 Replies]
- 01-Oct-2012 10:27 AM
- Forum: Programming Questions
Hi,

I am currently experiencing some difficulties with an array index out of bounds exception.

Here are the lines that bug:
1. if (TableauTampon[0]==0 && TableauTampon[1]==0){
2. TableauTampon[0]=42;
3. }
It could happen that TableauTampon[1] does not exist. In this case there is an exception which is thrown. However in the other case (when TableauTampon[1] exist) this test is crucial so I can't just just dropt it.

So the idea I had was to code a try / catch like this:
try {

if (TableauTampon[0]==0 && TableauTampon[1]==0){ // On passe l'une des deux valeurs à 1042 ...

TableauTampon[0]=1042;

}

}catch (IOException e) {

e.printStackTrace();

}
But the compiler tell me that it can't reach catch block for IO exceptions.

Any ideas how to solve this problem?

How to draw shapes from a PImage?

[2 Replies]
- 24-Apr-2012 10:49 AM
- Forum: General Discussion
Hello,

I am currently develloping an image processing project. More precisely I use the delaunay triangulation which draw triangles on an image which has been previously uploaded by the user (in the code it's a PImage).

After the triangulation step I manage to extract the coordinates oh each triangles individually. My question is: how to recreate individually each triangles with the background of the Pimage ?

As a drawing is often easier to understand than a long explanation there is a recap in picture.

1- The PImage background

2- The mesh after the delaunay triangulation (which is actually a layer above the image)

3- What I expect: explode each triangle individually.

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