Little syntax error eclipse from processing.

Integration and Hardware

p3tr4s

Little syntax error eclipse from processing.

in Integration and Hardware • 5 months ago

Hi,

Could you help me correcting syntax errors, when I rewrote processing sketch in eclipse.

Errors are very little, and time to time repeats... It would be enormous help for me for future scripts. Thanks:)

I will upload print-screens what was wrong in eclipse:

link1

link2

link3

link4

Here there is the script th eclipse rewritten, but it I do not know how to fix it:

It is made by D.Shiffman. - toxiclibs --> attraction point;

package layering;

import peasy.PeasyCam;

import processing.core.PApplet;

import toxi.physics.VerletPhysics;

import toxi.geom.*;

import toxi.physics.behaviors.*;

import toxi.physics.*;

public class Layering extends PApplet {

boolean dxfExport;

boolean record;

VerletPhysics physics;

Cluster cluster;

PeasyCam cam;

int def;

int abc;

int sceneWidth = 1280;

int sceneHeight = 800;

public void setup() {

size(sceneWidth, sceneHeight,OPENGL);

cam = new PeasyCam(this, 200, 500, 700, 400);

physics=new VerletPhysics();

physics.setDrag(0.05f);

physics.setWorldBounds(new AABB(new Vec3D(sceneWidth/2, sceneHeight/2, 0), new Vec3D(sceneWidth/2, sceneHeight/2, 600)));

cluster = new Cluster(this, 10, 0.0000000000000000001f, sceneWidth/40, sceneHeight/40);

}

public void draw() {

background(255);

physics.update();

cluster.display();

cluster.showConnections();

}

}

package layering;

import java.util.ArrayList;

import toxi.geom.Vec3D;

import toxi.physics.VerletParticle;

public class Cluster {

Layering e;

ArrayList <Particle> particles;

ArrayList <Attractor> attractors = new ArrayList <Attractor>();

float diameter;

float springRadius = 30;

float springForce;

int gridDimensionX;

int gridDimensionY;

float pv = 20;

Cluster(Layering _e, float d, float sf, int gridDimX, int gridDimY){

e = _e;

particles = new ArrayList();

diameter = d;

springForce = sf;

gridDimensionX = gridDimX;

gridDimensionY = gridDimY;

int w = e.width/gridDimX;

int h = e.height/gridDimY;

//ArrayList of particles

for (int y = 0; y < gridDimY; y++) {

for (int x = 0; x < gridDimX; x++) {

particles.add(new Particle(new Vec3D( (x+0.5f)*w, (y+0.5f)*h, 0 )));

}

}

attractors.add( new Attractor(new Vec3D(e.width/2,e.height/2,0), e.random(-.1f,.1f)));

//ArrayList of springs physics

for (int i = 0; i < particles.size()-1; i++){

VerletParticle ni = particles.get(i);

for (int j = i+1; j < particles.size(); j++){

VerletParticle nj = particles.get(j);

if (e.dist(ni.x, ni.y, nj.x, nj.y) < springRadius) {

}

}

}

}

void display(){

for (Attractor a : attractors) {

a.display();

for (Particle p : particles) {

p.display();

a.lock();

}

}

}

void showConnections() {

for (int i = 0; i < particles.size()-1; i++){

VerletParticle pi = (VerletParticle) particles.get(i);

for (int j = i+1; j < particles.size(); j++) {

VerletParticle pj = (VerletParticle) particles.get(j);

if (e.dist(pi.x, pi.y, pj.x, pj.y)<25 && e.dist(pi.x, pi.y, pj.x, pj.y)>19 ) {

e.stroke(10);

e.fill(255);

e.beginShape();

e.vertex(pi.x, pi.y );

e.vertex(pj.x, pj.y );

e.vertex(pj.x, pj.y,pv );

e.vertex(pi.x, pi.y ,pv);

e.endShape(e.CLOSE);

}

}

}

}

}

package layering;

import toxi.geom.Vec3D;

import toxi.physics.VerletParticle;

import toxi.physics.behaviors.AttractionBehavior;

public class Particle extends VerletParticle {

Layering e;

float n = 5;

float pv;

float r;

Particle (Layering _e, Vec3D loc) {

e = _e;

super(loc);

r = 5;

physics.addParticle(this);

physics.addBehavior(new AttractionBehavior(this,r*8,-0.01f));

}

void display(){

Vec3D vel = getVelocity().getNormalizedTo(r*2);

e.strokeWeight(0.5f);

e.ellipse(x, y, r*2, r*2);

}

}

package layering;

import toxi.geom.Vec3D;

import toxi.physics.VerletParticle;

import toxi.physics.behaviors.AttractionBehavior;

public class Attractor {

Layering e;

float r;

float force;

Attractor(Layering _e, Vec3D loc, float f){

e = _e;

super(loc);

force = f;

r = 10;

physics.addParticle(this);

physics.addBehavior(new AttractionBehavior(this,400,f));

}

void display (){

e.noStroke();

e.fill (10,200,200);

ellipse(x,y,r*2,r*2);

e.fill(0);

}

}

Replies(4)

PhiLho

Re: Little syntax error eclipse from processing.

5 months ago

Do you know that when you see the squiggly red lines marking errors in Eclipse, you can see the corresponding errors in a tooltip?
Well, we cannot do that in screenshots!

I will try anyway.

link1:
- super() call must be first in the constructor... and it useless here because your class doesn't extend any.
- physics is not a field of your class.
That's a bad habit we have in Processing, to rely on global variables inside classes. But the concept of global variables doesn't exist in Java! Well, it can work if you nest the class inside the main one, but I don't recommend it.
The clean way of doing it is to pass the physics object to the constructor of your class.

link2:
Same remarks as above. Well, not really, super() should be called here, but as said, must be the first line in the constructor.

link3:
- the yellow underline just marks warnings: they are minor remarks from the compiler, not preventing to run the code, but that should be fixed anyway.
Here, you use an untyped ArrayList, it should be typed with the kind of object you plan to put it.
particles = new ArrayList<Particle>(); And it allows you remove the casts when you use get()!
- I don't know why you have these errors (no tooltip, you know?), but if the number of parameters is OK (I suppose so, since it worked in Processing), then you must coerce the numbers from the default double type to float that Processing uses everywhere. Sometime, just add the f suffix, or use a cast if necessary.

link4:
- Your attractor class doesn't have a lock() method... Perhaps you wanted to do p.lock()?
- Not sure about the warning in the comparison, report the message.
- e.CLOSE: the message probably states that you should use Layering.CLOSE instead... Note that 'e' isn't a great variable name, particularly for a 'Layering' type (not even the same initial!).

p3tr4s

Re: Little syntax error eclipse from processing.

5 months ago

That is a big reply, thank you.

I try to extend everything from the main tab, I use "e." to "extend", it was from Chose Sanchez tutorials. I hate this stuff and do not know how to do this in a different way, because I cannot access commands like stroke, random and others... It is very annoying to write e.command every time.

I actually tried to use a.lock(); for attractor, this red marked too.

Somehow "endShape(CLOSE)" does not work when I remove e. it becomes red marked.

How to fix? this:

- super() call must be first in the constructor... and it useless here because your class doesn't extend any. (How to extend VerletParticle? )
- physics is not a field of your class.

Thank you for your effort, this would be a big help for me:)

PhiLho

Re: Little syntax error eclipse from processing.

5 months ago

" How to fix?"
- Remove the call to super() when the class doesn't extend another, and as said, put it as first line of constructor otherwise.
- As said, pass the physics variable as parameter to your constructor, so that your class has a reference on it.

" I hate this stuff"
Well, then, stick to the PDE.
Or exploit the power of Eclipse, its auto-completion capabilities, its debugging facilities, etc.
Personally, I use Eclipse all day at work, but I still use the PDE at home, because it is OK to test quickly sketches without even saving them!
But for a big Processing project, I suppose I would use Eclipse.