issue #11: java.lang.OutOfMemoryError when activating ShowEditorOnlyA…

…ction: add some logging and changed width calculation logic

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>de.markiewb.netbeans.plugins</groupId>
     <artifactId>codeoutline</artifactId>
-    <version>1.1.0</version>
+    <version>1.1.1-SNAPSHOT</version>
     <packaging>nbm</packaging>
     <build>
         <plugins>
@@ -87,6 +87,8 @@
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <netbeans.run.params.ide/>
+        <netbeans.run.params>-J-javaagent:"${current.jrebel.agent.path}" -J-Drebel.log=true ${netbeans.run.params.ide}</netbeans.run.params>
     </properties>
     <name>Code outline</name>
     <description>This plugins adds a code overview/outline for the current editor. 

src/main/java/bluej/editor/moe/NaviView.java

@@ -52,6 +52,7 @@ of the License, or (at your option) any later version.
 import javax.swing.text.Position.Bias;
 
 import bluej.Config;
+import java.util.logging.Logger;
 //import bluej.parser.nodes.ParsedNode;
 //import bluej.parser.nodes.NodeTree.NodeAndPosition;
 
@@ -357,7 +358,8 @@ private void paintImgBuffer(int top, int bottom)
 
         if (prefViewHeight > myHeight) {
             // scale!
-            int width = Math.max(imgBuffer.getWidth() * prefViewHeight / myHeight, 1);
+            //potential bugfix: https://github.com/markiewb/nb-codeoutline/issues/11
+            int width = Math.min(imgBuffer.getWidth() * prefViewHeight / myHeight, 400);
             int ytop = top * prefViewHeight / myHeight;
             int ybtm = (bottom * prefViewHeight + myHeight - 1) / myHeight;
             int height = ybtm - ytop;
@@ -381,6 +383,7 @@ private void paintImgBuffer(int top, int bottom)
                 bottom = top + (height * myHeight / prefViewHeight);
             }
 
+            Logger.getLogger("NaviView").info(String.format("Tried to create an image %s x %s top=%s, bottom=%s, myHeight=%s, ytop=%s,ybtm=%s, which may lead to an OOME.", width, height, top, bottom, myHeight, ytop,ybtm));
             // Create a buffered image to use
             BufferedImage bimage = g.getDeviceConfiguration().createCompatibleImage(width, height,Transparency.TRANSLUCENT);
             Map<Object,Object> hints = new HashMap<Object,Object>();
@@ -581,7 +584,8 @@ public void createImgBuffer(Graphics g, boolean scaling)
                 return;
             }
         }
-
+//        Logger.getLogger("NaviView").severe(String.format("image buffer %sx%s %sx%s", w,h, getWidth(), getHeight()));
+
         BufferedImage oldImgBuffer = imgBuffer;
 
         if (g instanceof Graphics2D) {