//@AutoInstall
// This macro tool creates a circular selection, moves
// it as long as the mouse button is down, and then 
// adds it to an overlay. Click on a circle and drag to
// move it. Alt click to remove it. Double click on 
// the tool icon to set the size of the circle.
// Double click on rectangle tool icon (left-most on toolbar)
// to set the default color and define the group names.
// There is more information about macro tools at
//   http://imagej.nih.gov/ij/developer/macro/macros.html#tools

  var size = 20;
  var leftButton = 16;
  var alt = 8;
  var strokeWidth = 2;
  var group;
  var measure;

  macro "Circle Tool - C037O0055Od355O7d55" {
     moving = false;
     getCursorLoc(x, y, z, flags);
     index = Overlay.indexAt(x,y);
     if (index>=0 && flags&alt!=0) {  // delete?
        Overlay.removeSelection(index);
        exit;
     }
     if (index>=0) {  // move
        Overlay.activateSelection(index);
        moving = true;
      }
      while (flags&leftButton!=0) {
           if (moving)
              Overlay.moveSelection(index, x-size/2, y-size/2);
           else {
              makeOval(x-size/2, y-size/2, size, size);
              Roi.setStrokeWidth(strokeWidth);
           }
           wait(25);
           getCursorLoc(x, y, z, flags);
      }
     if (!moving && Roi.size>0) {
        Roi.setGroup(group);
        Overlay.addSelection;
     }
     Roi.remove;
  }

  macro "Circle Tool Options" {
     Dialog.create("Circle Tool Options");
     Dialog.addNumber("Diameter", size);
     Dialog.addNumber("Stroke width", strokeWidth);
     Dialog.addNumber("Group", group);
     Dialog.addCheckbox("Measure:", measure);
     Dialog.show();
     size = Dialog.getNumber();
     strokeWidth = Dialog.getNumber();
     group = Dialog.getNumber();
     measure = Dialog.getCheckbox;
     if (measure)
        Overlay.measure;
     Roi.remove;
  }