// This example uses the Toolbar.setIcon(toolName,icon) method
// added in v1.53h, to dynamically update icons that track mouse
// movement. To use, click on "Install" to add three tools to the
// toolbar and then click and drag on the active image with the
// "G" tool.
// Author: Jerome Mutterer.

macro "Left Eye Action Tool - N44 C48f o46ff C000 o8c55 O00nn" {
   setTool("Googly Eyes Tool");
}

macro "Right Eye Action Tool - N44 C48f o46ff C000 o8c55 O00nn" {
  setTool("Googly Eyes Tool");
}

macro "Googly Eyes Tool - C000T0f16G" {
   x0=0; y0=0;
   getCursorLoc(x, y, z, modifiers);
   while (modifiers&16>0) {
      getCursorLoc(x, y, z, modifiers);
      if (x!=x0 || y!=y0) {
            call("ij.gui.Toolbar.setIcon", "Left Eye Action Tool", getIcon(x));
            call("ij.gui.Toolbar.setIcon", "Right Eye Action Tool", getIcon(x));
            x0=x; y0=y;
       }
       wait(50);
    }
 }

function getIcon(x) {
   blue = map(x,0,getWidth(),2,8);
   black = map(x,0,getWidth(),2,17);
   icon ="N44 C000 o00nn B11 Cfff o00ll C48f o"+h(blue)+"6ff C000 o"+h(black)+"c55";
   return icon;
}

function map(a,in_min,in_max,out_min,out_max) {
  return (a - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

function h(a) {
   return ""+toExtHex(constrain(a,0,23));
}

function toExtHex(n) {
   if (n>15) return fromCharCode(0x66+n-15);
   else return toHex(n);
}

function constrain(a,min,max) {
  if (a<min) a=min;
  if (a>max) a=max;
  return a;
}