funky curved line via ofNode

gistfile1.cpp

// in .h file: 

ofNode a,b,c;
float aEnergy;
float bEnergy;
float aEnergySmth;
float bEnergySmth;
float time;
ofPolyline nodeLine;
    
    
// in .cpp file: 
    
//--------------------------------------------------------------
void testApp::setup(){

    ofBackground(0);
    
    a.setPosition(500,300,0);
    b.setParent(a);
    b.setPosition(0,200,0);
    c.setParent(b);
    c.setPosition(0,100,0);
    
    aEnergy = 1;
    bEnergy = 1;
    
    aEnergySmth = 1;
    bEnergySmth = 1;
}

//--------------------------------------------------------------
void testApp::update(){

    for (int i = 0; i < nodeLine.size(); i++){
        nodeLine[i] -= ofPoint(1,0);
    }
    
    aEnergySmth = 0.97 * aEnergySmth + (1-0.97) *aEnergy;
    bEnergySmth = 0.97 * bEnergySmth + (1-0.97) *bEnergy;
    
    a.roll(aEnergySmth);
    b.roll(bEnergySmth);
    
    if ( ofRandom(0,1) > 0.95 ){
        aEnergy = 0.4 * ofRandom(4, 8) * (ofRandom(0,1) > 0.5 ? 1 : -1);
    }
    
    if (ofRandom(0,1) > 0.95){
        bEnergy = ofRandom(4,8) * (ofRandom(0,1) > 0.5 ? 1 : -1);
    }
   
    nodeLine.addVertex(c.getGlobalPosition());

    
}

//--------------------------------------------------------------
void testApp::draw(){
    
    ofCircle(a.getGlobalPosition(), 3);
    ofCircle(b.getGlobalPosition(), 3);
    ofCircle(c.getGlobalPosition(), 3);
    
    ofLine(a.getGlobalPosition(), b.getGlobalPosition());
    ofLine(b.getGlobalPosition(), c.getGlobalPosition());

    nodeLine.draw();
}