Fix PNG file from current graph is not loading the actual GUI configurations

src/main/java/com/tagtraum/perf/gcviewer/ctrl/action/Export.java

@@ -3,12 +3,13 @@
 import java.awt.Toolkit;
 import java.awt.event.ActionEvent;
 import java.io.File;
+import java.util.Map;
+import java.util.HashMap;
 
 import javax.swing.AbstractAction;
 import javax.swing.JFileChooser;
 import javax.swing.JOptionPane;
 import javax.swing.KeyStroke;
-import javax.swing.filechooser.FileFilter;
 
 import com.tagtraum.perf.gcviewer.exp.DataWriter;
 import com.tagtraum.perf.gcviewer.exp.DataWriterType;
@@ -86,7 +87,9 @@ public void exportFile(final GCModel model, File file, final String extension, f
                         LocalisationHelper.getString("fileexport_dialog_title"),
                         JOptionPane.YES_NO_OPTION)) {
 
-            try (DataWriter writer = DataWriterFactory.getDataWriter(file, dataWriterType)) {
+            Map<String, Object> configuration = new HashMap<>();
+            configuration.put(DataWriterFactory.GC_PREFERENCES, gcViewer.getSelectedGCDocument().getPreferences());
+            try (DataWriter writer = DataWriterFactory.getDataWriter(file, dataWriterType, configuration)) {
                 writer.write(model);
             }
             catch (Exception ioe) {

src/main/java/com/tagtraum/perf/gcviewer/exp/impl/DataWriterFactory.java

@@ -17,6 +17,7 @@
  * @author <a href="mailto:hs@tagtraum.com">Hendrik Schreiber</a>
  */
 public class DataWriterFactory {
+    public static final String GC_PREFERENCES = "gcPreferences";
 
     /**
      * Standard factory method to retrieve one of the <code>DataWriter</code> implementations.
@@ -53,7 +54,7 @@ public static DataWriter getDataWriter(File file, DataWriterType type, Map<Strin
             case CSV_TS  : return new CSVTSDataWriter(outputStream);
             case SIMPLE  : return new SimpleGcWriter(outputStream);
             case SUMMARY : return new SummaryDataWriter(outputStream, configuration);
-            case PNG     : return new PNGDataWriter(outputStream);
+            case PNG     : return new PNGDataWriter(outputStream, configuration);
             default : throw new IOException(LocalisationHelper.getString("datawriterfactory_instantiation_failed") + " " + file);
         }
     }

src/main/java/com/tagtraum/perf/gcviewer/exp/impl/PNGDataWriter.java

@@ -3,10 +3,12 @@
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.util.Map;
 
 import com.tagtraum.perf.gcviewer.view.SimpleChartRenderer;
 import com.tagtraum.perf.gcviewer.exp.AbstractDataWriter;
 import com.tagtraum.perf.gcviewer.model.GCModel;
+import com.tagtraum.perf.gcviewer.view.model.GCPreferences;
 
 /**
  * PNG data writter
@@ -15,16 +17,33 @@
  *
  */
 public class PNGDataWriter extends AbstractDataWriter {
-	private FileOutputStream out;
+	private final FileOutputStream out;
 
-	public PNGDataWriter(OutputStream outputStream) {
-		super(outputStream);
+	/**
+	 * Constructor for PNGDataWriter with additional <code>configuration</code> parameter.
+	 *
+	 * @param outputStream FileOutputStream, file where the image should be written to
+	 * @param configuration Configuration for this PNGDataWriter; expected contents of the parameter:
+	 * <ul>
+	 * <li>String: <code>DataWriterFactory.GC_PREFERENCES</code></li>
+	 * <li>Object: Instance of GCPreferences (E.g. current screen selection for chart)
+	 * </ul>
+	 */
+	public PNGDataWriter(OutputStream outputStream, Map<String, Object> configuration) {
+		super(outputStream, configuration);
 		out = (FileOutputStream)outputStream;
 	}
 
 	@Override
 	public void write(GCModel model) throws IOException {
-		new SimpleChartRenderer().render(model, out);
+		SimpleChartRenderer simpleChartRenderer = new SimpleChartRenderer();
+
+		Object gcPreferences = getConfiguration().get(DataWriterFactory.GC_PREFERENCES);
+		if (gcPreferences instanceof GCPreferences) {
+			simpleChartRenderer.render(model, out, (GCPreferences)gcPreferences);
+		} else {
+			simpleChartRenderer.render(model, out);
+		}
 	}
 
 }

src/main/java/com/tagtraum/perf/gcviewer/view/SimpleChartRenderer.java

@@ -22,6 +22,10 @@ public class SimpleChartRenderer {
     public void render(GCModel model, FileOutputStream outputStream) throws IOException {
         GCPreferences gcPreferences = new GCPreferences();
         gcPreferences.load();
+        render(model, outputStream, gcPreferences);
+    }
+
+    public void render(GCModel model, FileOutputStream outputStream, GCPreferences gcPreferences) throws IOException {
         Dimension d = new Dimension(gcPreferences.getWindowWidth(), gcPreferences.getWindowHeight());
 
         BufferedImage image = new BufferedImage(d.width, d.height, BufferedImage.TYPE_INT_RGB);