boolean showLabels=false;                   // changed through menu-toggles to animate and show/hide disk numbers
boolean track=false;                        // whether visibility tracking is on
boolean printIt=false;                      // temporarily set when key '?' is pressed and used to print some debugging values
boolean showDisks=true;                      // toggles showing disks
boolean showRays=true;                      // toggles showing visible rays
boolean showMesh=false;                       // toggles showing delaunay mesh
boolean showDual=false;                     // toggles showing dual
boolean showVertexIds=true, showVertices=true;
RAY myRay = new RAY(); // rayfrom view point (can be dragged)

void myActions() { // actions to be executed at each frame
 // edit and show polyloop
//   if ((mousePressed)&&(keyPressed)) dragPolygon();
//    stroke(cyan); fill(grey); drawPolygon(loopIsClosed); noFill();
//    if (showVertices) {stroke(orange); fill(white); showPoints(3); noFill(); };
//    if (showVertexIds) {fill(dblue); drawPointIDs(); noFill(); };
    
  
    if ((mousePressed)&&(keyPressed)&&(key=='c')&&mouseIsInWindow()) {P[p].moveWithMouse();  };       // moves selected point (index p) by amount mouse moved recently
    if (keyPressed&&(key=='d')) distribute();       // distribute disks

    if(showMesh) { fill(yellow); noStroke(); M.showShrunkTriangles();noFill(); }
    if(showDisks) {noStroke();   showDisks();  } 
       else { noStroke();   for (int i=0; i<n; i++) {fill(orange); P[i].show(2);};};
    if(showMesh) { fill(white); M.showVertices(); fill(dgreen); M.showCorner();stroke(dblue); noFill(); M.showTriangles(); }
    if(showDual) {stroke(grey); M.showDual(); };
    
    if ((mousePressed)&&(!keyPressed)) {myRay.drag(); safeView(myRay);}; // drag  viewpoint
   if (showLabels) {fill(black); for (int i=0; i<n; i++) P[i].showLabel(i); noFill(); };

    
    if(showRays) {strokeWeight(1); stroke(cyan); showVisibleRays(myRay);};

    strokeWeight(2); stroke(dgreen); int j=showVisibleRayPortion(myRay);  fill(red); stroke(red); myRay.showArrow(); myRay.Q.show(2); noFill();
    if(j>=0) {stroke(dmagenta); showVisibleRayPortion(leftTangentToCircle(myRay.Q,P[j],R[j])); showVisibleRayPortion(rightTangentToCircle(myRay.Q,P[j],R[j]));};
    strokeWeight(1);
    };