1 files changed, 103 insertions, 0 deletions
diff --git a/src/com/mbien/opencl/demos/joglinterop/UserSceneInteraction.java b/src/com/mbien/opencl/demos/joglinterop/UserSceneInteraction.java
new file mode 100644
index 0000000..50ffd6b
--- /dev/null
+++ b/src/com/mbien/opencl/demos/joglinterop/UserSceneInteraction.java
@@ -0,0 +1,103 @@
+package com.mbien.opencl.demos.joglinterop;
+
+import java.awt.Component;
+import java.awt.Point;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionAdapter;
+import java.awt.event.MouseWheelEvent;
+import java.awt.event.MouseWheelListener;
+import javax.media.opengl.GL2;
+
+/**
+ * Utility class for interacting with a scene. Supports rotation and zoom around origin.
+ * @author Michael Bien
+ */
+public class UserSceneInteraction {
+
+    private float z = -150;
+    private float rotx;
+    private float roty;
+
+    private Point dragstart;
+    private enum MOUSE_MODE { DRAG_ROTATE, DRAG_ZOOM }
+    private MOUSE_MODE dragmode = MOUSE_MODE.DRAG_ROTATE;
+
+
+    public void init(Component component) {
+        initMouseListeners(component);
+    }
+
+    private void initMouseListeners(Component component) {
+        component.addMouseMotionListener(new MouseMotionAdapter() {
+
+            @Override
+            public void mouseDragged(MouseEvent e) {
+
+                if (dragstart != null) {
+                    switch (dragmode) {
+                        case DRAG_ROTATE:
+                            rotx += e.getY() - dragstart.getY();
+                            roty += e.getX() - dragstart.getX();
+                            break;
+                        case DRAG_ZOOM:
+                            z += (e.getY() - dragstart.getY()) / 5.0f;
+                            break;
+                    }
+                }
+
+                dragstart = e.getPoint();
+            }
+        });
+        component.addMouseWheelListener(new MouseWheelListener() {
+
+            public void mouseWheelMoved(MouseWheelEvent e) {
+                z += e.getWheelRotation()*5;
+            }
+            
+        });
+        component.addMouseListener(new MouseAdapter() {
+
+            @Override
+            public void mousePressed(MouseEvent e) {
+                switch (e.getButton()) {
+                    case (MouseEvent.BUTTON1):
+                        dragmode = MOUSE_MODE.DRAG_ROTATE;
+                        break;
+                    case (MouseEvent.BUTTON2):
+                        dragmode = MOUSE_MODE.DRAG_ZOOM;
+                        break;
+                    case (MouseEvent.BUTTON3):
+                        dragmode = MOUSE_MODE.DRAG_ZOOM;
+                        break;
+                }
+            }
+
+            @Override
+            public void mouseReleased(MouseEvent e) {
+                switch (e.getButton()) {
+                    case (MouseEvent.BUTTON1):
+                        dragmode = MOUSE_MODE.DRAG_ZOOM;
+                        break;
+                    case (MouseEvent.BUTTON2):
+                        dragmode = MOUSE_MODE.DRAG_ROTATE;
+                        break;
+                    case (MouseEvent.BUTTON3):
+                        dragmode = MOUSE_MODE.DRAG_ROTATE;
+                        break;
+                }
+
+                dragstart = null;
+            }
+        });
+    }
+
+
+    public void interact(GL2 gl) {
+        gl.glTranslatef(0, 0, z);
+        gl.glRotatef(rotx, 1f, 0f, 0f);
+        gl.glRotatef(roty, 0f, 1.0f, 0f);
+    }
+
+
+}