UFT - Take full page screenshot by scrolling the page

'########################################################################################
'This is navigate through the full page and taking individual screenshot of visible area
'########################################################################################
Function TakeScreenshot
 Dim intScrolls, intScroll, strScrollPos
 Set pgApp = Browser("").Page("")

 intScrolls = Round(pgApp.RunScript("document.documentElement.scrollHeight / (screen.height)"), 2)
 If intScrolls < 1 Then intScrolls = -1

 pgApp.RunScript "window.scrollTo(0, 0);"
 Wait 1
 Browser("").CaptureBitmap "C:\screenshot0.png", True
 For intScroll = 0 To intScrolls
  If Environment.Value("Browser") = "CHROME" Then
   strScrollPos = "scrollY"
  Else
   strScrollPos = "document.documentElement.scrollTop"
  End If
  If pgApp.RunScript("document.documentElement.scrollHeight - " & strScrollPos) > pgApp.RunScript("screen.height") Then  
   intY = pgApp.RunScript(strScrollPos & " + screen.height - 168;")
   pgApp.RunScript "window.scrollTo(0, " & intY & ");"
   Wait 1  
   Browser("").CaptureBitmap "screenshot" & (intScroll + 1) & ".png", True
  End If          
 Next
 
 'To merge the images to generate full page screenshot
 Call MergeImages
End Function

'########################################################################################
'This is to merge all individual images to one full page screenshot
'########################################################################################
Function MergeImages   
    Dim drawImage, grapImage, imgFormat, imgLayer, imgPT
    Set drawImage = DotNetFactory.CreateInstance("System.Drawing.Bitmap", "System.Drawing", 1920, 1050)
    drawImage.SetResolution 50, 45
    Set grapImage = DotNetFactory.CreateInstance("System.Drawing.Graphics").FromImage(drawImage)
   
    Set imgLayer = DotNetFactory.CreateInstance("System.Drawing.Bitmap", "System.Drawing", "C:\screenshot0.png")
    Set imgPT = DotNetFactory.CreateInstance("System.Drawing.Point", "System.Drawing", 0, 0)
    grapImage.DrawImage Layer1, pt1
   
    Set imgLayer = DotNetFactory.CreateInstance("System.Drawing.Bitmap", "System.Drawing", "C:\screenshot1.png")
    Set imgPT = DotNetFactory.CreateInstance("System.Drawing.Point", "System.Drawing", 0, 540)
    grapImage.DrawImageUnScaled Layer2, pt2
   
    Set imgFormat = DotNetFactory.CreateInstance("System.Drawing.Imaging.ImageFormat", "System.Drawing", Nothing)
    drawImage.Save "finalScreenshot.png", format.PNG
End Function

This code is for UFT/VBScript and you can use the same logic by applying different APIs available for SELENIUM or any other tools.