--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/MainValuesWFacet.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,133 @@
+package org.dive4elements.river.artifacts.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.log4j.Logger;
+
+import org.dive4elements.artifacts.Artifact;
+import org.dive4elements.artifacts.CallContext;
+import org.dive4elements.artifacts.DataProvider;
+
+import org.dive4elements.artifactdatabase.state.DefaultFacet;
+
+import org.dive4elements.river.artifacts.MainValuesArtifact;
+import org.dive4elements.river.artifacts.math.Linear;
+import org.dive4elements.river.jfree.FLYSAnnotation;
+import org.dive4elements.river.jfree.StickyAxisAnnotation;
+
+
+/**
+ * Facet to show Main W Values.
+ */
+public class MainValuesWFacet
+extends      DefaultFacet
+implements   FacetTypes {
+
+    /** Own logger. */
+    private static Logger logger = Logger.getLogger(MainValuesWFacet.class);
+
+    /** Do we want MainValues at Gauge (not interpolated)? */
+    protected boolean isAtGauge;
+
+    /** Trivial Constructor. */
+    public MainValuesWFacet(String name, String description, boolean atGauge) {
+        this.description = description;
+        this.name = name;
+        this.index = 0;
+        this.isAtGauge = atGauge;
+    }
+
+
+    /**
+     * Set the hit-point in W where a line drawn from the axis would hit the
+     * curve in WQDay (if hit).
+     * Employ linear interpolation.
+     */
+    protected static void setHitPoint(WQDay wqday, StickyAxisAnnotation annotation) {
+        int idx = 0;
+        float w = annotation.getPos();
+        boolean wIncreases = wqday.getW(0) < wqday.getW(wqday.size()-1);
+        if (wIncreases) {
+            while (idx < wqday.size() && wqday.getW(idx) < w) {
+                idx++;
+            }
+        }
+        else {
+            idx = wqday.size() -1;
+            while (idx > 0 && wqday.getW(idx) > w) {
+                idx--;
+            }
+        }
+
+        double day = 0d;
+        int mod = (wIncreases) ? -1 : +1;
+        if (idx != 0 && idx < wqday.size()-1-mod) {
+            day = Linear.linear(w, wqday.getW(idx +mod), wqday.getW(idx),
+                wqday.getDay(idx+mod), wqday.getDay(idx));
+            annotation.setHitPoint((float)day);
+        }
+        else {
+            logger.debug("StickyAnnotation does not hit wqday curve");
+        }
+    }
+
+
+    /**
+     * Returns the data this facet provides.
+     *
+     * @param artifact the owner artifact.
+     * @param context  the CallContext (ignored).
+     *
+     * @return the data.
+     */
+    @Override
+    public Object getData(Artifact artifact, CallContext context) {
+        MainValuesArtifact mvArtifact = (MainValuesArtifact) artifact;
+
+        List<NamedDouble> ws = mvArtifact.getMainValuesW(isAtGauge);
+        List<StickyAxisAnnotation> xy = new ArrayList<StickyAxisAnnotation>();
+
+        // Find whether a duration curve is on the blackboard.
+        WQDay wqdays = null;
+        List<DataProvider> providers = context.
+            getDataProvider(DurationCurveFacet.BB_DURATIONCURVE);
+        if (providers.size() < 1) {
+            logger.warn("Could not find durationcurve data provider.");
+        }
+        else {
+            wqdays = (WQDay) providers.get(0).provideData(
+                DurationCurveFacet.BB_DURATIONCURVE,
+                null,
+                context);
+        }
+
+        for (NamedDouble w: ws) {
+            StickyAxisAnnotation annotation =
+                new StickyAxisAnnotation(
+                    w.getName(),
+                    (float) w.getValue(),
+                    StickyAxisAnnotation.SimpleAxis.Y_AXIS);
+            xy.add(annotation);
+            if (wqdays != null) {
+                setHitPoint(wqdays, annotation);
+            }
+        }
+
+        return new FLYSAnnotation(description, xy);
+    }
+
+
+    /**
+     * Create a deep copy of this Facet.
+     * @return a deep copy.
+     */
+    @Override
+    public MainValuesWFacet deepCopy() {
+        MainValuesWFacet copy = new MainValuesWFacet(this.name,
+            description, this.isAtGauge);
+        copy.set(this);
+        return copy;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :