Endless Runner like Runfield

[dev7]

I am passing tileScript in drawImage function on CanvasRenderingContext2D, 

 

gameplay - endless runner game like runfield, i am generating the track via tileScript and autoscrolling, i am passing tileScript object into the drawImage function to get sin-cos wave like effect (get the effect of up / down hill curves). 

 

but not getting the desired result..

 

http://www.creativeaddiction.co.uk/_site/view_full.html?d=display&f=bitmapdata+wobble.js&t=bitmapdata%20wobble

 

any better way to do it ?