Geomerative nullpointer problem

ed14th

Hi everyone : ) ,

I'm having issues with a program I currently making and can't figure out how the solve my nullpointer exception error... I want to make a little program that load a .svg, and allow you to draw with it. Thing is, i don't want the drawing to be pixels, i want it to be vectors. So the thing i'm trying to do is to add in a buffer shape the shapes you're making by moving the mouse with the RG.union function in geomerative.

Here's the code :

import geomerative.*;

RShape shp;
RShape cS; //the cursor shape
RShape cR=null; //the polygone saved

float anglerot;

void setup(){
  size(800, 600);
  background(255);
  smooth();
  //Il faut faire jouer ici le frameRate et anglerot pour trouver la ligne parfaite
  //frameRate(1);
  anglerot = 0.001;
  // VERY IMPORTANT: Allways initialize the library before using it
  RG.init(this);

  //svg file wich'll be shape of the pen
  shp = RG.loadShape("plume.svg");
  shp = RG.centerIn(shp, g);
  //pen size
  shp.scale(0.1);
  shp.setFill(5);
} 

Boolean initRes() {
  if (cR==null) {
   cR=new RShape(cS); //If cR empty, the first time, we fill it with cS shape
   println("creating cR " + cR);
   return true;
  } else return false;
}

void draw(){

  line(0, 400, width, 400);
  line(0, 100, width, 100);
  line(0, 200, width, 200);
  translate(width/2,height/2);

  cS = new RShape(shp);

  if (mousePressed){

  cS.translate(mouseX - width/2, mouseY - height/2);
  cS.rotate(anglerot, cS.getCenter());
  initRes();

  RG.shape(cS);

  }
}

void mouseDragged() {
  println(" cR " + cR + ", cS " + cS);
  cR=RG.union(cS, cR);
}

void keyPressed() {
    if (key == 'e' || key == 'E') {
      background(255);
    }
    if (key=='d') RG.shape(cR);
  }

The line wich is not working is

cR=RG.union(cS, cR); 

and i get a NullpointerException

Weird thing is that just before the println(" cR " + cR + ", cS " + cS); returns me cR geomerative.RShape@715c057c, cS geomerative.RShape@1a28651c

wich should means that shapes exist right ?

When looking around on the internet, I saw that most common source of nullPointer is local and global declaration, but I can't see any problem of that kind in my code. But a might missing it...

Is someone have an idea why it doesn't work ? : )

Chrisir

why is it in mouseDragged()?

my gut feeling:

try use mousePressed() as a function instead of having it in draw() as a boolean

;-)

PhiLho

Maybe the NPE is inside the Geomerative library. You should show the full stack trace (copy & paste from the console).

ed14th

Hi guys !

First of all, thanks for your replies ! I had to stop working on that problem because of some other hard work i had to do, but now i'm ready to get back on it !

Chrisir, are you suggesting something like that ?

import geomerative.*;

RShape shp;
RShape cS; //the cursor shape
RShape cR=null; //the polygone saved

float anglerot;

void setup(){
  size(800, 600);
  background(255);
  smooth();
  //Il faut faire jouer ici le frameRate et anglerot pour trouver la ligne parfaite
  //frameRate(1);
  anglerot = 0.001;
  // VERY IMPORTANT: Allways initialize the library before using it
  RG.init(this);

  //svg file wich'll be shape of the pen
  shp = RG.loadShape("plume.svg");
  shp = RG.centerIn(shp, g);
  //pen size
  shp.scale(0.1);
  shp.setFill(5);
} 

Boolean initRes() {
  if (cR==null) {
   cR=new RShape(cS); //If cR empty, the first time, we fill it with cS shape
   println("creating cR " + cR);
   return true;
  } else return false;
}

void draw(){

  line(0, 400, width, 400);
  line(0, 100, width, 100);
  line(0, 200, width, 200);
  translate(width/2,height/2);

  cS = new RShape(shp);

}

void mousePressed(){
  cS.translate(mouseX - width/2, mouseY - height/2);
  cS.rotate(anglerot, cS.getCenter());
  initRes();

  RG.shape(cS);
}

void mouseDragged() {
  println(" cR " + cR + ", cS " + cS);
  cR=RG.union(cS, cR);
}

void keyPressed() {
    if (key == 'e' || key == 'E') {
      background(255);
    }
    if (key=='d') RG.shape(cR);
  }

It doesn't work either : /

and PhiLho, the full stack trace is only what's inside the console when running the error ? Here it is :

Element '#text' not know. Ignoring it.
Element 'metadata' not know. Ignoring it.
Element '#text' not know. Ignoring it.
Element '#text' not know. Ignoring it.
Element 'sodipodi:namedview' not know. Ignoring it.
Element '#text' not know. Ignoring it.
Element '#text' not know. Ignoring it.
Element '#text' not know. Ignoring it.
Element '#text' not know. Ignoring it.
Element '#text' not know. Ignoring it.
Element '#text' not know. Ignoring it.
Element '#text' not know. Ignoring it.
creating cR geomerative.RShape@cab854
cR geomerative.RShape@cab854, cS geomerative.RShape@15cd9c0

Could possibly a NullPointer error be caused by the fact that too many shapes are unioned ?

ed14th

Ok, after running some tests, clearly the problem come from the loaded svg. Now I have to find out why.

Why does a svg into a union makes a nullPointer, while regular shape works.

I was helped by this example : openprocessing.org/sketch/2159

ed14th

Ok, finally find out why it wasn't working. I could have searched for years in the code, it was actually in the .svg.

My shape was a triangle but had weird useless points left. Once removed, it worked !