astTran2

Transform 2-dimensional coordinates

Description:

This function applies a Mapping to transform the coordinates of a set of points in two dimensions.

Synopsis

void astTran2( AstMapping this, int npoint, const double xin[], const double yin[], int forward, double xout[], double yout[] )

Parameters:

this
Pointer to the Mapping to be applied.
npoint
The number of points to be transformed.
xin
An array of " npoint" X-coordinate values for the input (untransformed) points.
yin
An array of " npoint" Y-coordinate values for the input (untransformed) points.
forward
A non-zero value indicates that the Mapping s forward coordinate transformation is to be applied, while a zero value indicates that the inverse transformation should be used.
xout
An array (with " npoint" elements) into which the X-coordinates of the output (transformed) points will be written.
yout
An array (with " npoint" elements) into which the Y-coordinates of the output (transformed) points will be written.

Notes: