--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/MainValuesQFacet.java	Fri Sep 28 12:14:35 2012 +0200
@@ -0,0 +1,152 @@
+package de.intevation.flys.artifacts.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.log4j.Logger;
+
+import de.intevation.artifacts.Artifact;
+import de.intevation.artifacts.CallContext;
+import de.intevation.artifacts.DataProvider;
+
+import de.intevation.artifactdatabase.state.DefaultFacet;
+
+import de.intevation.flys.artifacts.MainValuesArtifact;
+import de.intevation.flys.artifacts.math.Linear;
+import de.intevation.flys.jfree.FLYSAnnotation;
+import de.intevation.flys.jfree.StickyAxisAnnotation;
+
+import de.intevation.flys.exports.DurationCurveGenerator;
+
+
+/**
+ * Facet to show Main Q Values.
+ * TODO Join with W implementation.
+ */
+public class MainValuesQFacet
+extends      DefaultFacet
+implements   FacetTypes {
+
+    /** Own logger. */
+    private static Logger logger = Logger.getLogger(RelativePointFacet.class);
+
+    /** Do we want MainValues at Gauge (not interpolated)? */
+    protected boolean isAtGauge;
+
+    /** Trivial Constructor. */
+    public MainValuesQFacet(String name, String description, boolean atGauge) {
+        this.description = description;
+        this.name        = name;
+        this.index       = 0;
+        this.isAtGauge   = atGauge;
+    }
+
+    /**
+     * Set the hit-point in Q 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 q = annotation.getPos();
+        boolean qIncreases = wqday.getQ(0) < wqday.getQ(wqday.size()-1);
+        if (qIncreases) {
+            while (idx < wqday.size() && wqday.getQ(idx) < q) {
+                idx++;
+            }
+        }
+        else {
+            idx = wqday.size() -1;
+            while (idx > 0 && wqday.getQ(idx) > q) {
+                idx--;
+            }
+        }
+
+        double day = 0d;
+        int mod = (qIncreases) ? -1 : +1;
+        if (idx != 0 && idx <= wqday.size()-1) {
+            day = Linear.linear(q, wqday.getQ(idx +mod), wqday.getQ(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 requires.
+     *
+     * @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>          qs = mvArtifact.getMainValuesQ(isAtGauge);
+        List<StickyAxisAnnotation> xy = new ArrayList<StickyAxisAnnotation>();
+
+        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);
+        }
+
+        // Rather specific case, Q-Annotations at a maybe second yaxis.
+        StickyAxisAnnotation annotation = null;
+        if (this.name.equals(DURATION_MAINVALUES_Q)) {
+            for (NamedDouble q: qs) {
+                annotation =
+                    new StickyAxisAnnotation(
+                        q.getName(),
+                        (float) q.getValue(),
+                        StickyAxisAnnotation.SimpleAxis.Y_AXIS,
+                        DurationCurveGenerator.YAXIS.Q.idx);
+                xy.add(annotation);
+                if (wqdays != null) {
+                    setHitPoint(wqdays, annotation);
+                }
+            }
+        }
+        else {
+            for (NamedDouble q: qs) {
+                annotation =
+                    new StickyAxisAnnotation(
+                        q.getName(),
+                        (float) q.getValue(),
+                        StickyAxisAnnotation.SimpleAxis.X_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 MainValuesQFacet deepCopy() {
+        MainValuesQFacet copy = new MainValuesQFacet(this.name,
+            description, this.isAtGauge);
+        copy.set(this);
+        return copy;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :