main/src/georegression/geometry/UtilLine2D_F64.java
public static LineParametric2D_F64 convert( LineGeneral2D_F64 src ,  LineParametric2D_F64 ret ) {
		if( ret == null ) {
			ret = new LineParametric2D_F64();
		}

		ret.slope.x = src.B;
		ret.slope.y = -src.A;

		// find a point on the line
		if( Math.abs(src.B) > Math.abs(src.A) ) {
			ret.p.y = -src.C/src.B;
			ret.p.x = 0;
		} else {
			ret.p.x = -src.C/src.A;
			ret.p.y = 0;
		}

		return ret;
	}
public static LineParametric2D_F64 convert( LineGeneral2D_F64 src ,  LineParametric2D_F64 ret ) {
		if( ret == null ) {
			ret = new LineParametric2D_F64();
		}

		ret.slope.x = src.B;
		ret.slope.y = -src.A;

		// find a point on the line
		if( Math.abs(src.B) > Math.abs(src.A) ) {
			ret.p.y = -src.C/src.B;
			ret.p.x = 0;
		} else {
			ret.p.x = -src.C/src.A;
			ret.p.y = 0;
		}

		return ret;
	}
Converts a line from general to parametric

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