### astAxOffset

Add an increment onto a supplied axis value

#### Description:

This function returns an axis value formed by adding a signed axis increment onto a supplied axis value.

For a simple Frame, this is a trivial operation returning the sum of the two supplied values. But for other derived classes of Frame (such as a SkyFrame) this is not the case.

#### Synopsis

double astAxOffset( AstFrame $\ast$this, int axis, double v1, double dist )

#### Parameters:

##### this
Pointer to the Frame.
##### axis
The index of the axis to which the supplied values refer. The first axis has index 1.
##### v1
The original axis value.
##### dist
The axis increment to add to the original axis value.

#### Returned Value

##### astAxOffset
The incremented axis value.

#### Notes:

• This function will return a " bad" result value (AST__BAD) if any of the input values has this value.

• A " bad" value will also be returned if this function is invoked with the AST error status set, or if it should fail for any reason.