package org.geogebra.common.kernel.commands;
import org.geogebra.common.kernel.Kernel;
import org.geogebra.common.kernel.arithmetic.Command;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoPoint;
import org.geogebra.common.kernel.geos.GeoSegment;
import org.geogebra.common.kernel.kernelND.GeoPointND;
import org.geogebra.common.kernel.kernelND.GeoSegmentND;
import org.geogebra.common.main.MyError;
/**
* LineBisector[ <GeoPoint>, <GeoPoint> ] LineBisector[ <GeoSegment> ]
*/
public class CmdLineBisector extends CommandProcessor {
/**
* Create new command processor
*
* @param kernel
* kernel
*/
public CmdLineBisector(Kernel kernel) {
super(kernel);
}
@Override
final public GeoElement[] process(Command c) throws MyError {
int n = c.getArgumentNumber();
boolean[] ok = new boolean[n];
GeoElement[] arg;
switch (n) {
case 1: // segment
arg = resArgs(c);
// line through point orthogonal to segment
if (arg[0].isGeoSegment()) {
GeoElement[] ret = {
lineBisector(c.getLabel(), (GeoSegmentND) arg[0]) };
return ret;
}
// syntax error
throw argErr(app, c, arg[0]);
case 2: // two points
arg = resArgs(c);
return process2(c, arg, ok);
case 3:
arg = resArgs(c);
GeoElement[] ret = process3(c, arg, ok);
return ret;
default:
throw argNumErr(app, c, n);
}
}
/**
* process line bisector when 2 arguments
*
* @param c
* command
* @param arg
* arguments
* @param ok
* ok array
* @return result (if one)
* @throws MyError
* arg error
*/
protected GeoElement[] process2(Command c, GeoElement[] arg, boolean[] ok)
throws MyError {
// line through point orthogonal to vector
if ((ok[0] = (arg[0].isGeoPoint()))
&& (ok[1] = (arg[1].isGeoPoint()))) {
GeoElement[] ret = { lineBisector(c.getLabel(), (GeoPointND) arg[0],
(GeoPointND) arg[1]) };
return ret;
}
// syntax error
throw argErr(app, c, getBadArg(ok, arg));
}
/**
* process line bisector when 3 arguments
*
* @param c
* command
* @param arg
* arguments
* @param ok
* ok array
* @return result (if one)
* @throws MyError
* in 2D, not possible with 3 args
*/
protected GeoElement[] process3(Command c, GeoElement[] arg, boolean[] ok)
throws MyError {
throw argNumErr(app, c, 3);
}
/**
* @param label
* label
* @param segment
* segment
* @return perpendicular bisector
*/
protected GeoElement lineBisector(String label, GeoSegmentND segment) {
return getAlgoDispatcher().LineBisector(label, (GeoSegment) segment);
}
/**
* @param label
* label
* @param a
* first point
* @param b
* second point
* @return perpendicular bisector
*/
protected GeoElement lineBisector(String label, GeoPointND a,
GeoPointND b) {
return getAlgoDispatcher().LineBisector(label, (GeoPoint) a,
(GeoPoint) b);
}
}