pt pickedPoint = P();
int vc=32;                   // vertex count
Polyloop P= new Polyloop();
Polyloop D= new Polyloop();  // used to capture the curve drawn by the user
boolean linear=false;       // toggle linear interpolation
boolean geometric=false;
boolean animate=false;      // toggle animation
boolean sketching=false;    // toggle indicaitng that the user is sketching the selected curve
float t=0;                  // current time for animation

void myInit() {P.reset(vc);};
void mySave() {P.savePts();}; 
void myLoad() {P.loadPts();}; 
void myReset() {P.reset(vc);};
void myRefine() {P.refine(0,0);}
void myFilter() {P.smoothen(5);}
void myResample() {P.resample(32);}
void myActions() { // actions to be executed at each frame
    scribe("Polygon processing with Geometry Sandbox Jarek Rossignac");               
   if(mousePressed&&!keyPressed) {if(pickedPoint!=null) pickedPoint.trackMouse(); };
   if(mousePressed&&keyPressed) {  if(key=='s') myScale(); if(key=='r') myRotate(); if(key=='t') myTranslate(); if(key=='d') D.extendToMouse(); };
   if(sketching) {stroke(dred,50); noFill(); P.drawSmooth(0,5); fill(red,50); P.rP(0).show(4); fill(yellow,50); P.rP(1).show(3); stroke(red); noFill(); D.drawOpen(); noStroke();}
   else {stroke(red);  fill(yellow); P.drawSmooth(0,5); fill(white); P.showVertices(); fill(red); P.rP(0).show(4); fill(yellow); P.rP(1).show(3); };
   };
void mySelected(int n) {}     // user selects curve by typing its number n: select curve
void myStartAcquisition() {D.empty(); D.appendPt(Mouse()); sketching=true; }  // start acquisition processd
void myEndAcquisition() {if(sketching) {D.smoothen(5); for(int i=0; i<4; i++); D.refine(0,0); D.smoothen(10); D.resample(vc); P.setTo(D); sketching=false;}; }      // finish acquisition process
void myMousePressed() {
   if (Mouse().isInWindow()&&!keyPressed&&!sketching) pickedPoint=P.pickPoint(); 
   else if (Mouse().isInWindow()&&keyPressed&&(key=='d')) myStartAcquisition(); 
   } 
void myMouseReleased() {pickedPoint=null; myEndAcquisition();}
void myScale() {P.scaleWithMouse();}  
void myTranslate() {P.translateWithMouse();}
void myRotate() {P.rotateWithMouse();}