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 Identity
implements         Function
{
    public static final Identity IDENTITY = new Identity();

    public Identity() {
    }

    public double value(double x) {
        return x;
    }
}
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