Understanding Classpaths when creating externals in Eclipse w toxi Libs
Hey,
I am relatively inexperienced Java person, I usually work with Processing and avoid Eclipse, but I have created a few max externals previously. I haven't, however, created any mxj objects that use external libraries.
I thought I followed the process correctly. I believe I have imported the libraries correctly into my java project in eclipse (toxi libs). I am not getting any errors, put it that way, but when I try and run the object in max I get this error.
java.lang.NoClassDefFoundError: toxi/physics2d/behaviors/ParticleBehavior2D
I believe this is a class path thing? Perhaps max doesn't know where to find the verletphysics.jar ?
My class is below. Essentially I am wanting to use toxi physics to augment imput - at the present it is obviously not doing that - I was just testing the concept , which didn't work!! The class is based on Toxi's example.
Any help much appreciated.
import com.cycling74.max.*;
import toxi.geom.*;
import toxi.physics2d.*;
import toxi.physics2d.behaviors.*;
public class toxiPart extends MaxObject {
int NUM_PARTICLES = 1;
VerletPhysics2D physics;
AttractionBehavior mouseAttractor;
Vec2D mousePos;
public toxiPart(){
physics = new VerletPhysics2D();
physics.setDrag(0.05f);
physics.setWorldBounds(new Rect(0, 0, 200, 200));
//set attractor
mousePos = new Vec2D(100, 100);
// create a new positive attraction force field around the mouse position (radius=250px)
mouseAttractor = new AttractionBehavior(mousePos, 1000, 0.9f);
physics.addBehavior(mouseAttractor);
declareInlets(new int[]{ DataTypes.ALL, DataTypes.ALL});
declareOutlets(new int[]{ DataTypes.ALL, DataTypes.ALL});
}
void addParticle() {
VerletParticle2D p = new VerletParticle2D(Vec2D.randomVector().scale(5).addSelf(200 / 2, 0));
physics.addParticle(p);
// add a negative attraction force field around the new particle
//physics.addBehavior(new AttractionBehavior(p, 20, -1.2f, 0.01f));
}
public void bang(){
if (physics.particles.size() < NUM_PARTICLES) {
addParticle();
}
mousePos.set((float)Math.random()*200, (float)Math.random()*200);
physics.update();
for (VerletParticle2D p : physics.particles) {
outlet(0,p.x);
outlet(1,p.y);
}
}
}
You need to place verletphysics.jar into the Max classpath. On the Mac I believe this would be anywhere in the Max path - I put mine in "/Applications/Max 6.1/Cycling '74/java/lib".
Also if you want to create easily redistributable library of Java objects, your can build a jar-file with all dependencies in it and place this file to the "Cycling '74/java/lib" directory.
Awesome, thanks for the replies - will get onto that tonight!
Tim