I'm using graphael to create line charts. I want to create a zoom, that is, I have the array and I want the values between -20 and 30. Since my values are between 20 and 25 on the y-axis, I want to add between -20 and 30 and recalculate to be well positioned between the new values. I do not know if it has and see the gutter used in the library.
jsfiddle Example: link