// =====================================================
//    Photoshop CS javascript Utility Script
//    Rags Gardner www.rags-int-inc.com
//    javascript main() starts here
//    Alter only the following lines.
// =====================================================
// Application "Landscape" Size Target Values Here:
var newDocWidth = 9;             // The long side
var newDocHeight = 6;            // The short side
var newDocUnits = Units.INCHES;  // INCHES or PIXELS
var newDocAdjust = "none";       // crop, expand, or none
var scriptName = "Size6x9.js";   // this script name
// =====================================================

// =====================================================
// This script is intended for PS batch resizing
// Set units to inches for printing or pixels for web
// Specify the target dimensions in landscape orientation
// Adjustment defaults if the aspect ration changes:
// none:   just resize maintaining original aspect ratio
// crop:   center trim the side that is too long
// expand: edge fill the side that is too short
// =====================================================

// ===================================
//  Global Application Variables
// ===================================
var initRulerUnits = app.preferences.rulerUnits;
var initDisplayDialogs = app.DisplayDialogs;
var reSampleMethod = ResampleMethod.BICUBICSMOOTHER;
var docLandscape = true;
var newDocLarger = true;
var forPrint = false;
var oldDocWidth = 1;
var oldDocHeight = 1;
var docPixResolution = 1;
var tmpDocWidth  = 1;
var smallDocScale  = 1;
var largeDocScale  = 1;
var newDocScaleH = 1;
var newDocScaleW = 1;

// ===================================
//  Main
// ===================================
if (documents.length == 0 || ! validateDefaults() ) {
  alert(scriptName + ' There is no active document or defaults are invalid: target size(' 
         + newDocWidth + ',' + newDocHeight + ',' + newDocUnits 
         + ') Aspect Adjust=' + newDocAdjust);
} else {
   //---------------------------------
   //  Initialize Values & Orientation
   //---------------------------------
   app.preferences.rulerUnits = Units.PIXELS;
   app.DisplayDialogs = DialogModes.NO;
   var docRef = app.activeDocument;
   oldDocWidth = docRef.width.value;
   oldDocHeight = docRef.height.value;
   if (oldDocHeight > oldDocWidth) {
       docLandscape = false; // Portrait, swap dimensions
       tmpDocWidth  = newDocWidth;
       newDocWidth = newDocHeight;
       newDocHeight = tmpDocWidth;
   }
   if (newDocUnits == Units.INCHES)
      forPrint = true;  // assume printing if inches
   docPixResolution = docRef.resolution;
   if (forPrint && (docPixResolution == 72 || docPixResolution == 96)) {
      docPixResolution = 72;     // JPG, adjust to print resolution
   }

   // ===================================
   //  Run the Function()
   // ===================================
   doIt();  // run the function

   //--------------------------
   // Restore document settings
   //--------------------------
   app.preferences.rulerUnits = initRulerUnits;
   app.DisplayDialogs = initDisplayDialogs;
   docRef.resolution = docPixResolution;
} // end main

// ======================================
// function doIt(){
// ======================================
function doIt() {

   //-------------------------------------
   // CS2 Requires Resize based on Pixels
   //-------------------------------------
   if (newDocUnits == Units.INCHES) {
      newDocWidth *= docPixResolution;
      newDocHeight *= docPixResolution;
   }
   //-------------------------------
   // does it need to be resmapled ?
   //-------------------------------
   newDocScaleW = newDocWidth / oldDocWidth;
   newDocScaleH = newDocHeight / oldDocHeight;
   if (newDocScaleH < 1 || newDocScaleW < 1) { // size reduction?
       newDocLarger = false;
       reSampleMethod = ResampleMethod.BICUBICSHARPER;
   }
   //---------------------
   // scaling up or down ?
   //---------------------
   if (newDocScaleH > newDocScaleW) {
      largeDocScale  = newDocScaleH;
      smallDocScale  = newDocScaleW;
   } else {
      smallDocScale  = newDocScaleH;
      largeDocScale  = newDocScaleW;
   }
   //------------
   // diagnostics
   //------------
   if (1 == 0) {
      alert(scriptName + ' ' + (docLandscape ? "Landscape":"Portrait") + ', ' + newDocAdjust
                       + ', PPI(' + docPixResolution + ') ' 
                       + app.preferences.rulerUnits + ', ' + reSampleMethod
                       + '\n Sizes(W: I' + oldDocWidth + ', T' + newDocWidth 
                       + ', H: I' + oldDocHeight + ', T' + newDocHeight
                       + '), Scale '  + (newDocLarger ? "up":"down")
                       + ': S(' + smallDocScale + '), L(' + largeDocScale + ')');
   }
   //------------------------------
   // does it need to be resmapled?
   //------------------------------
   if (smallDocScale != 1 || largeDocScale != 1) {
      if (newDocAdjust == "crop")
         docRef.resizeImage(oldDocWidth * largeDocScale,
                            oldDocHeight * largeDocScale, 
                            docPixResolution, reSampleMethod);
      else   // expand or none
         docRef.resizeImage(oldDocWidth * smallDocScale,
                            oldDocHeight * smallDocScale, 
                            docPixResolution, reSampleMethod);
   }
   //------------------
   // set canvas size ?
   //------------------
   if (newDocAdjust != "none")   // crop or expand
      docRef.resizeCanvas(newDocWidth, newDocHeight, AnchorPosition.MIDDLECENTER);
   return;
}

// ======================================
// function validateDefaults(){
// ======================================
function validateDefaults() {
   var retVal = true;
   if (! (newDocAdjust == "crop" || newDocAdjust == "expand" || newDocAdjust == "none"))
      retVal = false;
   if (newDocWidth < 2 || newDocHeight < 2)
      retVal = false;
   if (newDocWidth < newDocHeight)
      retVal = false;
   if (! (newDocUnits == Units.INCHES || newDocUnits == Units.PIXELS))
      retVal = false;
   return retVal;
}