diff --git a/drawing/drawing.pde b/drawing/drawing.pde
index da26bf0..aa773dd 100644
--- a/drawing/drawing.pde
+++ b/drawing/drawing.pde
@@ -1,10 +1,23 @@
 final int DRAW_NORMAL=1;
 final int DRAW_DRAG=2;
 final int Vertex_Rad=8;
+// define parameters for rectangular button
+  int rectX=500, rectY=500;
+  int rectwidth=80;
+  int rectheight=40;
+  color rectColor;
+  color rectHighlight;
+  boolean rectover=false;
+  
 Vertex drag_start;
 Vertex vertex_under_mouse;
 void setup() {
-  size(640, 360);
+  size(600, 600);
+  background(255);
+  rectColor=(150);
+  rectHighlight=color(255,0,0);
+  rectX=500;
+  rectY=500;
   noStroke();
 }
 Graph G=new Graph();
@@ -17,6 +30,9 @@ void draw() {
   for(Vertex i:G.V){
     i.draw();
   }
+  
+  mouse_over_BUTTON();
+  
   //Draw Edges
   strokeWeight(2);
   for(Edge i:G.E){
@@ -30,6 +46,15 @@ void draw() {
     //Draw the dragged line;
   }
 }
+
+boolean check_mouse_over_button(int x, int y,int _height,int _width){
+  if(mouseY>=y && (mouseY-y<_height) &&(mouseX-x<_width)&& mouseX>=x)
+      rectover=true;
+  else rectover=false;
+   
+  return rectover;
+
+}
 void mouseMoved(){
   vertex_under_mouse=null;
   for(Vertex i:G.V){
@@ -45,7 +70,7 @@ void mouseDragged(){
   
 }
 void mousePressed(){
-  if(vertex_under_mouse==null){
+  if(vertex_under_mouse==null && !check_mouse_over_button(rectX,rectY,rectheight,rectwidth)){
     G.V.add(new Vertex(mouseX, mouseY,true));
   }
 }
@@ -63,3 +88,50 @@ void mouseReleased(){
     }
   }
 }
+
+
+void mouse_over_BUTTON(){
+
+  if(check_mouse_over_button(rectX,rectY,rectheight,rectwidth)){
+    fill(255,0,0);
+  }else {
+  fill(rectColor);
+  }
+   noStroke();
+   rect(rectX,rectY,rectwidth,rectheight);
+   textSize(10);
+   fill(0, 0, 0);
+   text("Initial Graph",rectX+rectwidth/8,rectY+rectheight/2);
+ 
+}
+
+
+
+void mouseClicked(){
+ if(check_mouse_over_button(rectX,rectY,rectheight,rectwidth))
+  //draw edges should be implemented by pressing button. 
+    for(int i=0;i<G.V.size();i++){
+      ArrayList index=new ArrayList ();
+      for(int r=0;r<G.V.size();r++){
+        index.add(r);
+      }
+      index.remove(i);
+        for(int j=0; j<3;j++){
+          stroke(0,0,255);
+          strokeWeight(2);
+          int k=int(random(index.size()));  
+          int l=(Integer)index.get(k);  
+          line(G.V.get(i).x,G.V.get(i).y,G.V.get(l).x,G.V.get(l).y);
+          //add the drawn edge
+          G.E.add(new Edge(G.V.get(i),G.V.get(l)));    
+          index.remove(k);
+        }
+      }
+        //remove the repeatedly added edges from the edge list
+        for(int i=0;i<G.E.size();++i){
+         for(int j=0;j<G.E.size();++j)
+           if(G.E.get(i).v2==G.E.get(j).v1 && G.E.get(i).v1==G.E.get(j).v2)
+             G.E.remove(j);
+         }
+
+}