Only create the GaugeTree and RiverInfoPanel once This fixes resizing issues when changing the river. SmartGWT is not able to recalculate the height and width if a GWT widget is inserted later. Every attempt to call a recalculation manually did fail. Fix for flys/issue925 (W-INFO / Pegel-Info-Modul / Zeile Gewässer-INFOS)

package de.intevation.flys.artifacts.math;

public final class Sub
implements         Function
{
    private double s;

    public Sub(double s) {
        this.s = s;
    }

    @Override
    public double value(double x) {
        return x - s;
    }
}
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