Apex Class-StatusProgressBarController

public class StatusProgressBarController {

    public String selectedObject;
    public String selectedField;
    
    public string currentStatus{get;set;}
    public list<String> picklistOptions{get;set;}
    
    
    public StatusProgressBarController(){
        picklistOptions=new List<String>();
    }
    public void setselectedObject(string obj){
        system.debug('*******setter method get called-setselectedObject');
        selectedObject=obj.toUpperCase();
        
    }
    public string getselectedObject(){
        system.debug('*******getter method get called-getselectedObject');
        return selectedObject;
    }
    
    public void  setselectedField(string fld){
        system.debug('*******setter method get called-setselectedField');
        selectedField=fld.toUpperCase();
        
    }
    public string getselectedField(){
        system.debug('*******getter method get called-getselectedField');
        return selectedField;
    }
    
    //public PageReference GenerateProgressBar(string objname,String FieldName){
    public PageReference GenerateProgressBar(){
        system.debug('*******GenerateProgressBar*****objname:'+selectedObject);
        system.debug('******GenerateProgressBar******FieldName:'+selectedField);
        Schema.DescribeSObjectResult objDescribe=Schema.getGlobalDescribe().get(selectedObject).getdescribe();
        Map<String, Schema.SObjectField> fieldMap = objDescribe.fields.getMap(); 
        Schema.DescribeFieldResult fd=fieldMap.get(selectedField).getDescribe();
        if(String.valueof(fd.getType()).equalsignorecase('Picklist')){
            List<Schema.PicklistEntry> Pp = fd.getPicklistValues();
            for(Schema.PicklistEntry p:Pp){
                system.debug('****picklist option label'+P.getLabel());
                system.debug('****picklist option value'+P.getvalue());
                picklistOptions.add(P.getLabel());
            }
        }
        
        string recordid= ApexPages.currentPage().getParameters().get('id');
        if(recordid!=null && recordid!=''){
            string queryString ='select id,'+selectedField + ' from '+ selectedObject + ' where id= \''+recordid+ '\'';
            system.debug('************queryString :'+queryString );
            
            sobject sobj=database.query(queryString);
            currentStatus=(string)sobj.get(selectedField);
        }else{
            currentStatus='';
            system.debug('*********not able to find current status of records');
        }
        return null;
    }
}

VFC-StatusProgressBar

<apex:component controller="StatusProgressBarController" >
<script>
    window.onload = function() { 
        //alert('Please Wait while we are generating Status Progress bar');
        GenerateStatusBar();
    } 
    
</script>
<style>
.container {
    position: relative;
    width: 150px;
    float:left;
    
}

.center {
    position: absolute;
    
    top: 30%;
    width: 130px;
    text-align: center;
    font-size: 18px;
    white-space: pre-wrap;         
    white-space: -moz-pre-wrap;   
    white-space: -pre-wrap;       
    white-space: -o-pre-wrap;   
    word-wrap: break-word;      
}

img {
    width: 150px;
    height: 80px;    
}
.containerdiv{
    
}
</style>

    <apex:attribute Name="objectAPIName" type="String" assignTo="{!selectedObject}" description="Specify the API name of object" required="true"/>
    <apex:attribute Name="fieldAPIName" type="String" assignTo="{!selectedfield}" description="Specify the API name of field" required="true" />
    <apex:form id="f1">
    
    <!-- {!selectedObject}<br/>    {!selectedField}<br/>-->
    
    <div class="containerdiv">
        <apex:repeat value="{!picklistOptions}" var="opt" >
            <apex:outputpanel rendered="{!if(currentStatus <>opt,true,false)}">
                <div class="container">
                  <apex:image value="{!$Resource.progressBar}" style="opacity:0.2"/>
                  <div class="center">
                      <apex:outputText value="{!opt}"/>
                  </div>
                </div>
            </apex:outputpanel>
    
            <apex:outputpanel rendered="{!if(currentStatus ==opt,true,false)}">
                <div class="container">
                  <apex:image value="{!$Resource.progressBar}" style="opacity:1"/>
                  <div class="center">
                      <apex:outputText value="{!opt}"/>
                  </div>
                </div>
            </apex:outputpanel>
        </apex:repeat>
    </div>  
    <apex:actionFunction name="GenerateStatusBar" action="{!GenerateProgressBar}" id="gsb" reRender="f1"/>
       
</apex:form>
</apex:component>