Set smaller min scale values for in MamutBranchViewGrapher so that fu…

…rther zoom in is possible

src/main/java/org/mastodon/mamut/views/grapher/MamutBranchViewGrapher.java

@@ -53,6 +53,7 @@
 import org.mastodon.views.grapher.display.FeatureGraphConfig;
 import org.mastodon.views.grapher.display.FeatureGraphConfig.GraphDataItemsSource;
 import org.mastodon.views.grapher.display.FeatureSpecPair;
+import org.mastodon.views.grapher.display.InertialScreenTransformEventHandler;
 
 import java.util.Iterator;
 import java.util.function.BiConsumer;
@@ -75,6 +76,9 @@ public class MamutBranchViewGrapher extends MamutBranchView< DataGraph< BranchSp
 		grapherInitializer = new GrapherInitializer<>( viewGraph, appModel, selectionModel, navigationHandler, focusModel, highlightModel,
 				getGroupHandle() );
 		grapherInitializer.getFrame().setTitle( "Grapher Branch" );
+		InertialScreenTransformEventHandler handler = grapherInitializer.getFrame().getDataDisplayPanel().getTransformEventHandler();
+		handler.setMinScaleX( 0.1d );
+		handler.setMinScaleY( 0.1d );
 		grapherInitializer.setOnClose( this );
 		grapherInitializer.initFeatureConfig( getFeatureGraphConfig() );
 		setFrame( grapherInitializer.getFrame() ); // this creates viewActions and viewBehaviours thus must be called before installActions

src/main/java/org/mastodon/views/grapher/display/InertialScreenTransformEventHandler.java

@@ -274,6 +274,16 @@ public synchronized void updateAxesSize( final int width, final int height )
 		updateTransformScreenSize();
 	}
 
+	public void setMinScaleY( final double minScaleY )
+	{
+		this.minScaleY = minScaleY;
+	}
+
+	public void setMinScaleX( final double minScaleX )
+	{
+		this.minScaleX = minScaleX;
+	}
+
 	private void updateTransformScreenSize()
 	{
 		final ScreenTransform transform = transformState.get();