Add ability to zoom via scroll wheel (#263)

Co-authored-by: Matt Foulks <mfoulks@atlassian.com>

Author: mfoulks3200

pom.xml

@@ -49,6 +49,10 @@
         <developer>
             <name>Ryan Gardner</name>
         </developer>
+        <developer>
+            <name>Matt Foulks</name>
+            <url>https://github.com/mfoulks3200</url>
+        </developer>
         <developer>
             <name>Martin Geldmacher</name>
             <url>https://github.com/geld0r</url>

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

@@ -43,6 +43,7 @@ public class AboutDialog extends ScreenCenteredDialog implements ActionListener
         "Cka3o4Huk",
         "Frank Dietrich",
         "Bernd Eckenfels",
+        "Matt Foulks",
         "Ryan Gardner",
         "Martin Geldmacher",
         "Neil Gentleman",

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

@@ -4,8 +4,7 @@
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
 import java.awt.Point;
-import java.awt.event.ComponentAdapter;
-import java.awt.event.ComponentEvent;
+import java.awt.event.*;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.util.ArrayList;

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

@@ -4,6 +4,8 @@
 
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
 import java.beans.PropertyVetoException;
 import java.util.ArrayList;
 import java.util.List;
@@ -27,7 +29,6 @@ public class GCViewerGui extends JFrame {
 
     public GCViewerGui() {
         super("tagtraum industries incorporated - GCViewer");
-
         setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
     }
 

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

@@ -11,10 +11,7 @@
 import javax.swing.event.ChangeListener;
 import javax.swing.event.SwingPropertyChangeSupport;
 import java.awt.*;
-import java.awt.event.ComponentEvent;
-import java.awt.event.ComponentListener;
-import java.awt.event.MouseAdapter;
-import java.awt.event.MouseEvent;
+import java.awt.event.*;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.text.DateFormat;
@@ -185,6 +182,26 @@ private void maybePopup(MouseEvent e) {
             }
         });
 
+
+        addMouseWheelListener(new MouseWheelListener() {
+            @Override
+            public void mouseWheelMoved(MouseWheelEvent e) {
+                if (((e.getModifiersEx() & InputEvent.META_DOWN_MASK) != 0 && System.getProperty("os.name").contains("Mac OS X"))||(e.getModifiersEx() & InputEvent.CTRL_DOWN_MASK) != 0 && !System.getProperty("os.name").contains("Mac OS X")) {
+                    double pos = (double)(getHorizontalScrollBar().getValue()) / (double)(chart.getWidth());
+                    if (e.getWheelRotation() > 0 && getScaleFactor() < 100) {
+                        setScaleFactor((getScaleFactor()*1.2));
+                    }
+                    if (e.getWheelRotation() < 0 && getScaleFactor() > 0.01) {
+                        setScaleFactor((getScaleFactor()/1.2));
+                    }
+                    if (e.getWheelRotation() != 0) {
+                        getHorizontalScrollBar().setValue((int)(pos * (double)(chart.getWidth())));
+                        e.consume();
+                    }
+                }
+            }
+        });
+
     }
 
     public void addTimeOffsetChangeListener(PropertyChangeListener listener) {