public Value eval(RCvalue args) throws EvalException {
if ((args.size() < 0) || (3 < args.size()))
throw new EvalException("usage: reduce(polygon, [errtol,[edgeReducible] ] ])");
if (!(args.value(0) instanceof PolygonValue))
throw new EvalException("reduce: first operand must be a polygon");
double errtol = defaultErrtol;
if (args.size() >= 2) { // get error tolerance
if (!(args.value(1) instanceof DoubleValue))
throw new EvalException("reduce: second operand must be an integer");
errtol = ((DoubleValue) (args.value(1))).value();
}
boolean edgeReducible = true;
if (args.size() >= 3) {
double temp = ((DoubleValue) (args.value(2))).value();
edgeReducible = (temp > 0); // temp = 1, edge reducible, otherwise, not
}
Polygon.EndCondition ec = new Polygon.CostEndCondition(errtol);
if (errtol >= 3) {
int maxV = (int) Math.round(errtol);
ec = new Polygon.DegreeEndCondition(maxV);
}
PolygonValue p = (PolygonValue) (args.value(0));
Polygon poly = p.polygon();
if (poly instanceof ConvexPolygon) { // NOTE: connection for reduce
if (edgeReducible) return new PolygonValue(((ConvexPolygon) poly).reduce(ec));
else return p; // can't reduce because convex polygon can only reduce edge
} else {
return new PolygonValue(poly.reduce(ec, true, edgeReducible));
}
}
public Value eval(RCvalue args) throws EvalException {
if (args.size() != 1) throw new EvalException("usage: hull(polygon)");
if (!(args.value(0) instanceof PolygonValue))
throw new EvalException("hull: argument must be a polygon");
PolygonValue pv = (PolygonValue) (args.value(0));
Polygon poly = pv.polygon();
return new PolygonValue(poly.convexHull()); // NOTE: connection for convex hull
}
public Value eval(RCvalue args) throws EvalException {
Polygon[] polys = new Polygon[args.size() - 1];
for (int i = 0; i < args.size() - 1; i++) {
PolygonValue pv = (PolygonValue) args.value(i);
polys[i] = pv.polygon();
}
PolygonValue pv = (PolygonValue) args.value(args.size() - 1); // the last polygon
return new PolygonValue(pv.polygon().union(polys));
}
public Value eval(RCvalue args) throws EvalException {
if (args.size() != 2) throw new EvalException("usage: reduce(polygon, errtol])");
PolygonValue pv1 = (PolygonValue) args.value(0);
PolygonValue pv2 = (PolygonValue) args.value(1);
boolean isContain = pv1.polygon().contains(pv2.polygon());
double contain = 0;
if (isContain) {
contain = 1; // we don't have a boolean factory now.
}
return ValueFactory.create(contain);
}