flowchart.js integration with angular

I am trying to integrate flowchart.js with angular. I have included all the required files. But, I am getting some error like this..

zone-evergreen.js:172 Uncaught TypeError: Raphael is not a constructor
at new FlowChart (flowchart-latest.js:955)
at Object.drawSVG (flowchart-latest.js:675)
at btn.onclick (check.js:14)
at window.onload (check.js:57)
at wrapFn (zone-evergreen.js:1202)
at ZoneDelegate.invokeTask (zone-evergreen.js:400)
at Zone.runTask (zone-evergreen.js:168)
at ZoneTask.invokeTask [as invoke] (zone-evergreen.js:481)
at invokeTask (zone-evergreen.js:1596)
at globalZoneAwareCallback (zone-evergreen.js:1633)
Can anyone find the issue..
Thanks in Advance.