corefx - updated node labels for easier visibility with backgrounds

corefx/src/main/java/com/core/graph/CoreVertexLabelRenderer.java

@@ -0,0 +1,36 @@
+package com.core.graph;
+
+import edu.uci.ics.jung.visualization.renderers.DefaultVertexLabelRenderer;
+
+import javax.swing.*;
+import javax.swing.border.EmptyBorder;
+import java.awt.*;
+
+public class CoreVertexLabelRenderer extends DefaultVertexLabelRenderer {
+
+    CoreVertexLabelRenderer(Color pickedVertexLabelColor) {
+        super(pickedVertexLabelColor);
+    }
+
+    @Override
+    public <V> Component getVertexLabelRendererComponent(JComponent vv, Object value, Font font, boolean isSelected, V vertex) {
+        super.setForeground(Color.WHITE);
+        if (isSelected) {
+            this.setForeground(this.pickedVertexLabelColor);
+        }
+
+        super.setBackground(Color.BLACK);
+        if (font != null) {
+            this.setFont(font);
+        } else {
+            this.setFont(vv.getFont());
+        }
+
+        this.setIcon(null);
+        EmptyBorder padding = new EmptyBorder(5, 5, 5, 5);
+        this.setBorder(padding);
+        this.setValue(value);
+        setFont(getFont().deriveFont(Font.BOLD));
+        return this;
+    }
+}

corefx/src/main/java/com/core/graph/NetworkGraph.java

@@ -70,6 +70,7 @@ public class NetworkGraph {
 
         // node render properties
         renderContext.setVertexLabelTransformer(CoreNode::getName);
+        renderContext.setVertexLabelRenderer(new CoreVertexLabelRenderer(Color.YELLOW));
         renderContext.setVertexShapeTransformer(node -> {
             double offset = -(IconUtils.ICON_SIZE / 2.0);
             return new Ellipse2D.Double(offset, offset, IconUtils.ICON_SIZE, IconUtils.ICON_SIZE);