Added fix for new relation creation.

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>nl.andrewlalis</groupId>
     <artifactId>EntityRelationMappingEditor</artifactId>
-    <version>1.3.0</version>
+    <version>1.3.1</version>
     <build>
         <plugins>
             <plugin>

src/main/java/nl/andrewlalis/erme/EntityRelationMappingEditor.java

@@ -7,7 +7,7 @@ import nl.andrewlalis.erme.view.EditorFrame;
 import java.nio.charset.StandardCharsets;
 
 public class EntityRelationMappingEditor {
-	public static final String VERSION = "1.3.0";
+	public static final String VERSION = "1.3.1";
 
 	public static void main(String[] args) {
 		if (!FlatLightLaf.install()) {

src/main/java/nl/andrewlalis/erme/control/actions/edits/AddRelationAction.java

@@ -3,6 +3,7 @@ package nl.andrewlalis.erme.control.actions.edits;
 import lombok.Setter;
 import nl.andrewlalis.erme.model.MappingModel;
 import nl.andrewlalis.erme.model.Relation;
+import nl.andrewlalis.erme.view.DiagramPanel;
 
 import javax.swing.*;
 import java.awt.*;
@@ -23,6 +24,9 @@ public class AddRelationAction extends AbstractAction {
 	@Setter
 	private MappingModel model;
 
+	@Setter
+	private DiagramPanel diagramPanel;
+
 	public AddRelationAction() {
 		super("Add Relation");
 		this.putValue(SHORT_DESCRIPTION, "Add a new relation to the diagram.");
@@ -39,9 +43,23 @@ public class AddRelationAction extends AbstractAction {
 				JOptionPane.PLAIN_MESSAGE
 		);
 		if (name != null) {
+			final boolean isFirstRelation = this.model.getRelations().isEmpty();
+			Point p;
+			if (isFirstRelation) {
+				p = new Point(100, 100);
+			} else {
 				Rectangle bounds = this.model.getRelationBounds();
-			Point center = new Point(bounds.x + bounds.width / 2, bounds.y + bounds.height / 2);
+				p = new Point(bounds.x + bounds.width / 2, bounds.y + bounds.height / 2);
-			this.model.addRelation(new Relation(this.model, center, name));
+			}
+			Relation r = new Relation(this.model, p, name);
+			this.model.getSelectedRelations().forEach(rl -> rl.setSelected(false));
+			r.setSelected(true);
+			this.model.addRelation(r);
+			if (isFirstRelation) {
+				this.model.normalizeRelationPositions();
+				this.diagramPanel.centerModel();
+				this.diagramPanel.repaint();
+			}
 		}
 	}
 }

src/main/java/nl/andrewlalis/erme/model/MappingModel.java

@@ -73,6 +73,9 @@ public class MappingModel implements Serializable, Viewable {
 	}
 
 	public Rectangle getRelationBounds() {
+		if (this.getRelations().isEmpty()) {
+			return new Rectangle(0, 0, 0, 0);
+		}
 		int minX = Integer.MAX_VALUE;
 		int minY = Integer.MAX_VALUE;
 		int maxX = Integer.MIN_VALUE;
@@ -109,6 +112,10 @@ public class MappingModel implements Serializable, Viewable {
 			minX = Math.min(minX, r.getPosition().x);
 			minY = Math.min(minY, r.getPosition().y);
 		}
+		if (this.getRelations().isEmpty()) {
+			minX = 0;
+			minY = 0;
+		}
 		for (Relation r : this.getRelations()) {
 			final Point current = r.getPosition();
 			r.setPosition(new Point(current.x - minX, current.y - minY));

src/main/java/nl/andrewlalis/erme/view/DiagramPanel.java

@@ -123,6 +123,7 @@ public class DiagramPanel extends JPanel implements ModelChangeListener {
 		LoadAction.getInstance().setDiagramPanel(this);
 		ExportToImageAction.getInstance().setModel(this.model);
 		AddRelationAction.getInstance().setModel(this.model);
+		AddRelationAction.getInstance().setDiagramPanel(this);
 		RemoveRelationAction.getInstance().setModel(this.model);
 		AddAttributeAction.getInstance().setModel(this.model);
 		RemoveAttributeAction.getInstance().setModel(this.model);