ReplaceWithSymbol_v2.jsx

/******************************
* @title ReplaceWithSymbol
* @author Jonatan Hilden
* @info http://koponen-hilden.fi
* @version 2.0.0


DESCRIPTION
Script for replacing graphic objects with symbols. Select a number of objects and a symbol instance before running the script. Gives a choice of using the size of the symbol (default) or scaling the symbols to match the size of replaced objects.  
Groups are treated as single objects. Potentially slow for many objects.

*******************************/

var scriptID = "Replace with symbol ";
var numSelectedItems = 0;
var docRef = app.activeDocument;


var selectedSymbol = null; 
// find a symbol in the selection (first symbol found is used)

selectedSymbol = getSymbolInSelection(docRef, selectedSymbol);

//$.write(selectedSymbol);

// script will not work unless selection includes a symbol
var symbolName = 'NONE SELECTED – script will fail!';
if (selectedSymbol){
	symbolName = selectedSymbol.name;
}

// Make a simple interface box 
var box = new Window('dialog', scriptID);  
box.alignChildren='left';
// headline
box.add('statictext', undefined, "Replace selected objects with symbol instance");

// stats panel: display selected object count and symbol
box.statsPanel = box.add('panel', undefined, "Info");  
box.statsPanel.alignChildren='left';
box.statsPanel.group0 = box.statsPanel.add('group', undefined );  

box.statsPanel.add('statictext', undefined, "Symbol name: " + symbolName);
box.statsPanel.add('statictext', undefined, "Selected object count: " + numSelectedItems);

// options panel
box.optionsPanel = box.add('panel', undefined, "Options");  
box.optionsPanel.alignChildren='left';

// scale checkbox, default: false
var scaleCheck = box.optionsPanel.add('checkbox', undefined, "Scale symbols to match original objects?");
scaleCheck.value=false;

// clear originals checkbox; default true
var clearCheck = box.optionsPanel.add('checkbox', undefined, "Clear original objects?");
clearCheck.value=true;

// ok and cancel buttons group
box.buttons = box.add('group', undefined );  
box.buttons.orientation='row';  

box.buttons.add('statictext', undefined, "Run script");  
var okButton = box.buttons.add('button',undefined, "OK", {name:'ok'});  
var closeButton = box.buttons.add('button',undefined, "Cancel", {name:'close'});  

// Ok button function
okButton.onClick = function(){  
	
	var scaleSymbol = scaleCheck.value;
	var clearOriginals = clearCheck.value;

		if (selectedSymbol == null)
		{alert(scriptID + "\n" + "please select a symbol", scriptID, true); 
		box.close();
		} else {
			replaceWithSymbol(docRef, selectedSymbol, clearOriginals, scaleSymbol);
			box.close();
		}

    
	// box.ok();  
	
  }  

  closeButton.onClick = function(){
	  box.close();
	}  
	
  box.show()




function replaceWithSymbol(docRef, selectedSymbol, clearOriginals, scaleSymbol){ 

		// loop through remaining selection and replace them with symbols on active layer
		// clear originals if desired
          
		for(i=0;i<docRef.selection.length;i++){  
				var currObj=docRef.selection[i];  
                   // $.write(currObj.layer);
				var currLeft=currObj.left;  
				var currTop=currObj.top;  
				var currWidth=currObj.width;  
				var currHeight=currObj.height;  
				var currInstance=docRef.activeLayer.symbolItems.add(selectedSymbol); 
                    
				if (scaleSymbol){
					currInstance.width*=currHeight/currInstance.height;  
					currInstance.height=currHeight;  
					currInstance.left=currLeft;  
					currInstance.top=currTop;  
				} else {
					currInstance.position = Array( currObj.position[0]+currWidth/2 - currInstance.width/2,
					currObj.position[1]-currHeight/2 + currInstance.height/2 );
				}
				currObj.selected = false;
				currInstance.selected = true;
				if (clearOriginals) {currObj.remove();}
		}
		redraw();


		if (numSelectedItems > 0) {
			// alert(scriptID + "\n" + numSelectedItems + " " + ((numSelectedItems == 1)?"object":"objects") + " in total", scriptID, true);
		} else {
			alert(scriptID + "\n" + "please select objects", scriptID, true);
			return;
		}	
}

function getSymbolInSelection(docRef, selectedSymbol) {
    // loop through selected items to get the desired symbol and deselect this item
    var symbolLayer = null;
    for(i=0;i<docRef.selection.length;i++){  
			if(docRef.selection[i].symbol) {
                symbolLayer = docRef.selection[i].layer;
				selectedSymbol = docRef.selection[i].symbol;
				docRef.selection[i].selected = false;
				numSelectedItems -= 1;
				}
  		numSelectedItems += 1;
	}
    

    return  selectedSymbol;
}