main/src/georegression/geometry/UtilLine2D_F64.java
public static LineParametric2D_F64 convert( LinePolar2D_F64 src , LineParametric2D_F64 ret )
	{
		if( ret == null )
			ret = new LineParametric2D_F64();

		double c = (double) Math.cos(src.angle);
		double s = (double) Math.sin(src.angle);

		ret.p.set(c*src.distance,s*src.distance);
		ret.slope.set(-s,c);

		return ret;
	}
public static LineParametric2D_F64 convert( LinePolar2D_F64 src , LineParametric2D_F64 ret )
	{
		if( ret == null )
			ret = new LineParametric2D_F64();

		double c = (double) Math.cos(src.angle);
		double s = (double) Math.sin(src.angle);

		ret.p.set(c*src.distance,s*src.distance);
		ret.slope.set(-s,c);

		return ret;
	}
Converts a line from polar form to parametric.

@param src (input) line is polar notation
@param ret (output) line in parametric notation.  If null a new instance will be created.
@return Converted line in parametric notation