Index: trunk/psModules/src/objects/pmPhotObj.c
===================================================================
--- trunk/psModules/src/objects/pmPhotObj.c	(revision 26893)
+++ trunk/psModules/src/objects/pmPhotObj.c	(revision 27657)
@@ -17,4 +17,5 @@
 #include <pslib.h>
 #include "pmPhotObj.h"
+#include "pmSource.h"
 
 static void pmPhotObjFree (pmPhotObj *tmp)
@@ -38,2 +39,27 @@
 }
 
+bool pmPhotObjAddSource(pmPhotObj *object, pmSource *source) {
+
+    psAssert (source, "programming error: NULL source");
+    if (!source->peak) {
+	psError(PS_ERR_UNKNOWN, true, "source missing peak");
+	return false; 
+    }
+    if (!finite(source->peak->xf)) {
+	psError(PS_ERR_UNKNOWN, true, "NAN peak coordinate");
+	return false; 
+    }
+    if (!finite(source->peak->yf)) {
+	psError(PS_ERR_UNKNOWN, true, "NAN peak coordinate");
+	return false; 
+    }
+
+    // XXX we should probably use the fitted position if it exists
+    if (!object->sources) {
+	object->sources = psArrayAllocEmpty(1);
+	object->x = source->peak->xf;
+	object->y = source->peak->yf;
+    }
+    psArrayAdd (object->sources, 1, source);
+    return true;
+}