//   This is a tool macro similar to the paint brush tool in NIH Image.
//   It draws in the current foreground color, which can be set by
//   double-clicking on the eye dropper tool. Double-click on 
//   the paintbrush tool icon to set the brush width.

  var brushWidth = 10;
 
   macro "Paintbrush Tool - C0aao33aa" {
        leftClick=16;
        //setupUndo(); // requires 1.32g or later
        getCursorLoc(x, y, z, flags);
        setLineWidth(brushWidth);
        moveTo(x,y);
        x2=-1; y2=-1;
        while (true) {
            getCursorLoc(x, y, z, flags);
            if (flags&leftClick==0) exit();
            if (x!=x2 || y!=y2)
                lineTo(x,y);
            x2=x; y2 =y;
            wait(10);
        }
   }

  // ImageJ runs this macro when user double-clicks on the paint brush tool icon
  macro 'Paintbrush Tool Options' {
      brushWidth = getNumber("Brush Width:", brushWidth);
  }