first import book

book/modules/luther/sphinx/animation/searchmodels.js

@@ -0,0 +1,138 @@
+DataItem = function(pos, h, col)
+{
+   this.value = h
+   this.position = pos
+   this.color = col
+}
+
+DataItem.prototype.clone=function()
+{
+	  var newitem = new DataItem(this.position,this.value,this.color)   //make a copy
+	  return newitem
+}
+
+DataItem.prototype.getValue=function()
+{  
+   return this.value
+}
+
+DataItem.prototype.getColor=function()
+{
+   return this.color
+}
+
+DataItem.prototype.getPosition=function()
+{
+   return this.position
+}
+
+DataItem.prototype.setValue=function(newh)
+{
+   this.value = newh
+}
+
+DataItem.prototype.setPosition=function(newp)
+{
+   this.position = newp
+}
+
+DataItem.prototype.setColor=function(newc)
+{
+   this.color = newc
+}
+
+BinarySearchModel = function()  //construct the model
+{
+}
+    
+BinarySearchModel.prototype.init = function(ctl)
+{
+	this.mycontroller = ctl
+
+	this.valuelist = new Array()
+	var howmany = 25
+    var initvalues=[25,30,46,55,60,78,90,95,101,110,122,134,145,150,166,175,187,200,205,213,240,255,267,299]
+	for (var i=0; i<howmany; i++)
+	{
+	  var item = new DataItem(i,initvalues[i],"black")
+	  this.valuelist.push(item)
+	}
+	
+	this.script = new Array()
+	//this.script.push(this.makescene(this.valuelist))
+
+    this.binarySearch(this.valuelist,200)
+    
+    this.script.push(this.makescene(this.valuelist))
+    return this.script
+}
+
+BinarySearchModel.prototype.binarySearch=function(alist, item)
+{     
+    var first = 0
+    var last = alist.length-1
+    var found = false
+    var oldmidpoint = null
+    
+    while (first<=last && !found)
+    {                this.chunkcolor(first,last,"black")
+                this.script.push(this.makescene(this.valuelist))
+                if (oldmidpoint != null)
+                   {alist[oldmidpoint].setColor("black")
+                    this.script.push(this.makescene(this.valuelist))}
+        var midpoint = Math.floor((first + last)/2)
+        alist[midpoint].setColor("blue")
+        this.script.push(this.makescene(this.valuelist))
+        //alist[midpoint].setColor("black")
+        //this.script.push(this.makescene(this.valuelist))
+        if (alist[midpoint].getValue() == item)
+        {
+            found = true
+            alist[midpoint].setColor("green")
+            this.script.push(this.makescene(this.valuelist))
+        }   
+        else
+            if (item < alist[midpoint].getValue())
+            {
+                last = midpoint-1
+                this.chunkcolor(first,midpoint-1,"red")
+                this.script.push(this.makescene(this.valuelist))
+                oldmidpoint = midpoint
+                //alist[midpoint].setColor("black")
+                //this.script.push(this.makescene(this.valuelist))
+            }
+            else
+            {
+                first = midpoint+1
+                this.chunkcolor(midpoint+1,last,"red")
+                this.script.push(this.makescene(this.valuelist))
+                oldmidpoint = midpoint
+                //alist[midpoint].setColor("black")
+                //this.script.push(this.makescene(this.valuelist))
+            }
+                
+    }
+    return found
+
+}
+
+
+BinarySearchModel.prototype.chunkcolor=function(start,end,c)
+{
+    for (var clearidx=start; clearidx<=end; clearidx++)
+         this.valuelist[clearidx].setColor(c)
+}
+
+
+BinarySearchModel.prototype.makescene = function(somearray)
+{
+   var newscene = new Array()
+   for (var idx=0; idx<somearray.length; idx++)
+   {
+	  var item = somearray[idx].clone()   //make a copy
+	  newscene.push(item)
+   }   
+   
+   return newscene
+}
+