--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/FixationArtifact.java	Fri Aug 17 14:29:05 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/FixationArtifact.java	Fri Aug 17 15:31:02 2018 +0200
@@ -8,34 +8,29 @@
 
 package org.dive4elements.river.artifacts;
 
-import org.dive4elements.artifacts.CallContext;
+import java.io.Serializable;
 
-import org.dive4elements.river.artifacts.geom.Lines;
-
+import org.apache.log4j.Logger;
+import org.dive4elements.artifacts.CallContext;
 import org.dive4elements.river.artifacts.model.CalculationResult;
 import org.dive4elements.river.artifacts.model.WKms;
 import org.dive4elements.river.artifacts.model.fixings.FixRealizingResult;
-
 import org.dive4elements.river.artifacts.states.DefaultState.ComputeType;
 
-import org.dive4elements.river.model.FastCrossSectionLine;
-
-import org.apache.log4j.Logger;
-
 /**
  * The default fixation analysis artifact.
  *
  * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
  */
-public class FixationArtifact
-extends      D4EArtifact
-implements   WaterLineArtifact
-{
+public class FixationArtifact extends D4EArtifact implements WaterLineArtifact {
+
+    private static final long serialVersionUID = 1L;
+
     /** The log for this class. */
     private static Logger log = Logger.getLogger(FixationArtifact.class);
 
     /** The name of the artifact. */
-    public static final String ARTIFACT_NAME = "fixanalysis";
+    private static final String ARTIFACT_NAME = "fixanalysis";
 
     /* FacetActivity for this artifact is registered in FixAnalysisCompute . */
 
@@ -58,33 +53,22 @@
 
     /** Calculate waterlines against a cross section. */
     @Override
-    public Lines.LineData getWaterLines(
-        int                  facetIdx,
-        FastCrossSectionLine      csl,
-        double                      d,
-        double                      w,
-        CallContext           context
-    ) {
-        FixRealizingResult result = (FixRealizingResult)
-            ((CalculationResult)this.compute(
-                context, ComputeType.ADVANCE, false)).getData();
+    public double getWaterLevel(final ComputeType type, final String hash, final String stateId, final double currentKm, final Serializable waterLineIndex,
+            final double nextKm, final double prevKm, final CallContext context) {
+        final FixRealizingResult result = (FixRealizingResult) ((CalculationResult) this.compute(context, ComputeType.ADVANCE, false)).getData();
 
-        WKms wkms = result.getWQKms()[facetIdx];
+        final int wstIndex = (Integer) waterLineIndex;
 
-        double km = csl.getKm();
+        final WKms wkms = result.getWQKms()[wstIndex];
 
         // Find W at km.
-        double wAtKm;
-
-        wAtKm = StaticWKmsArtifact.getWAtKm(wkms, km);
+        final double wAtKm = StaticWKmsArtifact.getWAtKm(wkms, currentKm);
 
         if (wAtKm == -1 || Double.isNaN(wAtKm)) {
-            log.warn("Waterlevel at km " + km + " unknown.");
-            return new Lines.LineData(new double[][] {{}}, 0d, 0d);
+            log.warn("Waterlevel at km " + currentKm + " unknown.");
+            return Double.NaN;
         }
 
-        // This should be FixRealizationResult, which can be getWQKms()ed
-        return Lines.createWaterLines(csl.getPoints(), wAtKm);
+        return wAtKm;
     }
-}
-// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
+}
\ No newline at end of file