From d14bfb83fddf30539f401de54ce9f61bd0aff25c Mon Sep 17 00:00:00 2001
From: =?utf8?q?Hannu=20Niemist=C3=B6?= <hannu.niemisto@semantum.fi>
Date: Wed, 21 Nov 2018 13:22:52 +0200
Subject: [PATCH] Prevent some NPEs in Graphviz plugin

gitlab #209

Change-Id: Id29a4e20470ca63c07e3b0be41b6b12bf2e1281a
---
 .../META-INF/MANIFEST.MF                      |  3 +-
 .../graphviz/drawable/GraphDrawable.java      |  7 ++--
 .../simantics/graphviz/drawable/JViewer.java  | 36 ++++++++++++-------
 3 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/bundles/org.simantics.graphviz/META-INF/MANIFEST.MF b/bundles/org.simantics.graphviz/META-INF/MANIFEST.MF
index 3271c8eff..ea99ad54b 100644
--- a/bundles/org.simantics.graphviz/META-INF/MANIFEST.MF
+++ b/bundles/org.simantics.graphviz/META-INF/MANIFEST.MF
@@ -4,7 +4,8 @@ Bundle-Name: Graphviz
 Bundle-SymbolicName: org.simantics.graphviz
 Bundle-Version: 1.1.0.qualifier
 Bundle-Activator: org.simantics.graphviz.Activator
-Require-Bundle: org.eclipse.core.runtime
+Require-Bundle: org.eclipse.core.runtime,
+ org.slf4j.api;bundle-version="1.7.25"
 Bundle-ActivationPolicy: lazy
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Export-Package: org.simantics.graphviz,
diff --git a/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/GraphDrawable.java b/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/GraphDrawable.java
index b1495788f..d5c80c70d 100644
--- a/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/GraphDrawable.java
+++ b/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/GraphDrawable.java
@@ -22,6 +22,8 @@ import org.simantics.graphviz.continuation.Computation;
 import org.simantics.graphviz.continuation.Continuation;
 import org.simantics.graphviz.internal.xdot.DrawCommand;
 import org.simantics.graphviz.internal.xdot.DrawCommandParser;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * A drawable that draws a given graph.
@@ -29,7 +31,8 @@ import org.simantics.graphviz.internal.xdot.DrawCommandParser;
  * @author Hannu Niemist�
  */
 public class GraphDrawable implements Drawable {
-
+    private static final Logger LOGGER = LoggerFactory.getLogger(GraphDrawable.class);
+    
 	private static String DEFAULT_ALGORITHM = "dot";
 	
 	DrawCommand[] commands;
@@ -113,7 +116,7 @@ public class GraphDrawable implements Drawable {
 	@Override
 	public synchronized Rectangle2D getBounds() {
 	    if(bounds == null)
-	        System.err.println("bounds == null");
+	        LOGGER.warn("bounds == null");
 		return bounds;
 	}
 	
diff --git a/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/JViewer.java b/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/JViewer.java
index 2543a7a66..d50f57756 100644
--- a/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/JViewer.java
+++ b/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/JViewer.java
@@ -97,6 +97,8 @@ public class JViewer extends JFrame {
     		addMouseMotionListener(new MouseAdapter() {
     			@Override
     			public void mouseDragged(MouseEvent e) {
+    			    if(transform == null)
+    			        return;
     				Point cur = e.getPoint();
     				if (prev == null)
     				    prev = cur;
@@ -111,16 +113,16 @@ public class JViewer extends JFrame {
 
 				@Override
 				public void mouseWheelMoved(MouseWheelEvent e) {
-					if(transform != null) {
-						double scale = Math.exp(-0.1*e.getUnitsToScroll());
-						Point p = e.getPoint();
-						AffineTransform mod = new AffineTransform();
-						mod.translate(p.getX(), p.getY());
-						mod.scale(scale, scale);
-						mod.translate(-p.getX(), -p.getY());
-						transform.preConcatenate(mod);						
-						repaint();
-					}
+					if(transform == null)
+					    return;
+					double scale = Math.exp(-0.1*e.getUnitsToScroll());
+					Point p = e.getPoint();
+					AffineTransform mod = new AffineTransform();
+					mod.translate(p.getX(), p.getY());
+					mod.scale(scale, scale);
+					mod.translate(-p.getX(), -p.getY());
+					transform.preConcatenate(mod);
+					repaint();
 				}
     			
     		});
@@ -135,8 +137,11 @@ public class JViewer extends JFrame {
     	    	
     	private void fit() {
     		Rectangle2D bounds = drawable.getBounds();
-    		
     		Rectangle2D container = getBounds();
+    		
+    		if(bounds == null || container == null)
+    		    return;
+    		
     		double scale = container == null ? 1 : Math.min(
     				container.getWidth() / bounds.getWidth(), 
     				container.getHeight() / bounds.getHeight());
@@ -161,8 +166,15 @@ public class JViewer extends JFrame {
     		g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
     		g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
     			    	
-    		if(transform == null)
+    		if(transform == null) {
     			fit();
+    			if(transform == null) {
+    			    g.setTransform(new AffineTransform());
+    			    g.setColor(Color.BLACK);
+    			    g.drawString("No data available yet", 20f, 20f);
+    			    return;
+    			}
+    		}
     		g.setTransform(transform);
     		
     		drawable.draw(g, null);
-- 
2.47.1