Feat/scatterplot rasterizer 34

• Replace static title and labels by user supplied values
• Use column view for legend
• correct label order

src/main/java/de/tudresden/inf/mci/brailleplot/diagrams/BarChart.java

 package de.tudresden.inf.mci.brailleplot.diagrams;
 
 import de.tudresden.inf.mci.brailleplot.datacontainers.Named;
-import de.tudresden.inf.mci.brailleplot.datacontainers.PointContainer;
 import de.tudresden.inf.mci.brailleplot.datacontainers.PointList;
 import de.tudresden.inf.mci.brailleplot.datacontainers.PointListContainer;
 
 import java.util.List;
-import java.util.Objects;
 import java.util.stream.Collectors;
 
 /**
@@ -15,11 +13,9 @@ import java.util.stream.Collectors;
  * @version 2019.09.02
  */
 public class BarChart extends Diagram {
-    private PointListContainer<PointList> mData;
 
     public BarChart(final PointListContainer<PointList> data) {
-        Objects.requireNonNull(data);
-        mData = data;
+        super(data);
     }
 
     /**
@@ -28,7 +24,7 @@ public class BarChart extends Diagram {
      * @return list with category names as strings
      */
     public List<String> getCategoryNames() {
-        return mData.stream()
+        return getDataSet().stream()
                 .map(Named::getName)
                 .collect(Collectors.toUnmodifiableList());
     }
@@ -39,7 +35,7 @@ public class BarChart extends Diagram {
      * @return double minimum y-value
      */
     public double getMinY() {
-        return mData.getMinY();
+        return getDataSet().getMinY();
     }
 
     /**
@@ -48,15 +44,8 @@ public class BarChart extends Diagram {
      * @return double maximum y-value
      */
     public double getMaxY() {
-        return mData.getMaxY();
+        return getDataSet().getMaxY();
     }
 
-    /**
-     * Getter for a list with x-y-Pairs: x is the index (always just counts from 0 up), y is the value.
-     * @return PointList with the corresponding data set
-     */
-    public PointContainer<PointList> getDataSet() {
-        return mData;
-    }
 }