I created a chain of CircleParticles connected to each other with
SpringContraints. One CircleParticle is draggable. I want the chain
(rope) to hold his length. Now is stretches out according how far you
would drag the circleparticle.

I build is with Flash CS3 so this code can be placed on the first
frame. No extra classes build yet. I added one extra class
"DragableCircleParticle" which can be found in the files from this
group (http://groups.google.com/group/ape-general/files).

import org.cove.ape.*;

APEngine.init(1/4);
APEngine.container = this;
APEngine.addMasslessForce(new Vector(0,8));

var color1:uint = 0x00ff00;
var color2:uint = 0xff00ff;

var defaultGroup:Group = new Group();
defaultGroup.collideInternal = true;

var anker:CircleParticle = new CircleParticle(240,0,10, true);
defaultGroup.addParticle(anker);

var cp1:CircleParticle = new CircleParticle(250,10,1);
defaultGroup.addParticle(cp1);

var sc1:SpringConstraint = new SpringConstraint(anker, cp1, 0.5,
false, 1);
        sc1.restLength = 10;
sc1.setStyle(1, color1, 1, color2);
defaultGroup.addConstraint(sc1);

var cp2:CircleParticle = new CircleParticle(250,20,1);
defaultGroup.addParticle(cp2);

var sc2:SpringConstraint = new SpringConstraint(cp1, cp2, 0.5, false,
1);
        sc2.restLength = 10;
sc2.setStyle(1, color1, 1, color2);
defaultGroup.addConstraint(sc2);

var cp3:DragableCircleParticle = new DragableCircleParticle(250,30,5);
defaultGroup.addParticle(cp3);

var sc3:SpringConstraint = new SpringConstraint(cp2, cp3, 0.5, false,
1);
sc3.setStyle(1, color1, 1, color2);
defaultGroup.addConstraint(sc3);

var cp4:CircleParticle = new CircleParticle(250,20,1);
defaultGroup.addParticle(cp4);

var sc4:SpringConstraint = new SpringConstraint(cp3, cp4, 0.5, false,
1);
sc4.setStyle(1, color1, 1, color2);
defaultGroup.addConstraint(sc4);

var cp5:CircleParticle = new CircleParticle(250,10,1);
defaultGroup.addParticle(cp5);

var sc5:SpringConstraint = new SpringConstraint(cp4, cp5, 0.5, false,
1);
sc5.setStyle(1, color1, 1, color2);
defaultGroup.addConstraint(sc5);

var sc6:SpringConstraint = new SpringConstraint(cp5, anker, 0.5,
false, 1);
sc6.setStyle(1, color1, 1, color2);
defaultGroup.addConstraint(sc6);

APEngine.addGroup(defaultGroup);

addEventListener(Event.ENTER_FRAME, run);

function run(evt:Event):void {
        APEngine.step();
        APEngine.paint();

I'm not sure but what you're seraching for is create a chain with
constraints but no elasticity, and that can move where you drag it ???
Is it ????

On 7 jul, 14:37, ben <benjamin.fouc...@club.fr> wrote:

Sorry if this is an obvious wrong answer, I just started using APE. I
am searching for a solution to curved surfaces and have been toying
with the idea of making the curve or arc with a section of stiff
spring objects. Imagine taking the bridge example from the car demo
and laying it in an arc, placing the circle particles in a fixed
position and setting the spring value to the stiffest setting to
prevent stretching.

In your case, Celar, you would leave the circle particles' position
unfixed.

On Jul 7, 8:30 am, Celar <arjan.cee...@gmail.com> wrote: