// calc tangent at x=a
@Override
public final void compute() {
double a = n.getDouble();
if (!f.isDefined() || !deriv.isDefined() || Double.isInfinite(a) || Double.isNaN(a)) {
tangent.setUndefined();
return;
}
// calc the tangent;
double fa = f.evaluate(a);
double slope = deriv.evaluate(a);
tangent.setCoords(-slope, 1.0, a * slope - fa);
T.setCoords(a, fa, 1.0);
}
@Override
public final void compute() {
if (input[0].isDefined() && point.isDefined()) {
if (path instanceof GeoFunction) {
Function fun = (Function) ((GeoFunction) path).getFunction().deepCopy(kernel);
Coords coords = point.getCoordsInD2();
double val =
AlgoDistancePointObject.getClosestFunctionValueToPoint(
fun, coords.getX(), coords.getY());
((GeoPoint) P).setCoords(val, fun.evaluate(val), 1.0);
} else {
setCoords();
path.pointChanged(P);
}
P.updateCoords();
} else {
P.setUndefined();
}
}
/** set coords of closest point to input point coords */
protected void setCoords() {
((GeoPoint) P).setCoords((GeoPoint) point);
}