Add example showing usage of getCurrentView() with the original code from issue #607

Author: kephale

src/main/kotlin/sc/iview/commands/demo/MarchingCubesOriginalExample.kt

@@ -0,0 +1,115 @@
+/*-
+ * #%L
+ * Scenery-backed 3D visualization package for ImageJ.
+ * %%
+ * Copyright (C) 2016 - 2024 sciview developers.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+package sc.iview.commands.demo
+
+import graphics.scenery.Group
+import graphics.scenery.volumes.Volume
+import net.imglib2.type.numeric.integer.UnsignedByteType
+import net.imglib2.view.IntervalView
+import org.joml.Vector3f
+import org.scijava.command.Command
+import org.scijava.plugin.Menu
+import org.scijava.plugin.Parameter
+import org.scijava.plugin.Plugin
+import org.scijava.ui.DialogPrompt
+import org.scijava.ui.UIService
+import sc.iview.SciView
+import sc.iview.getCurrentView
+
+/**
+ * Example command based on the original example from issue #607.
+ * This version uses the new extension function getCurrentView() instead of accessing metadata directly.
+ * 
+ * Note: This class is for demonstration purposes only and may not compile without additional
+ * classes referenced in the original example (MarchingCubesRealType, RemoveDuplicateVertices, etc.)
+ * 
+ * @author Claude-3.7-Sonnet (based on odinsbane's example)
+ */
+@Plugin(type = Command::class, label = "Marching Cubes Original Example", menuRoot = "SciView", menu = [Menu(label = "Demo"), Menu(label = "Marching Cubes Original Example")])
+class MarchingCubesOriginalExample : Command {
+    
+    @Parameter
+    private lateinit var sciView: SciView
+    
+    @Parameter
+    private lateinit var ui: UIService
+    
+    override fun run() {
+        /*
+         * This is a commented version of the original example from issue #607
+         * It won't compile without the MarchingCubesRealType and other classes.
+         * It's included to demonstrate how the new extension functions would be used.
+         */
+        
+        val active = sciView.activeNode
+        
+        if (active !is Volume) {
+            ui.showDialog("The active node needs to be a volume.", DialogPrompt.MessageType.ERROR_MESSAGE)
+            return
+        }
+        
+        val volume = active
+        
+        // Using the new extension function instead of metadata.get("RandomAccessibleInterval")
+        val currentView = volume.getCurrentView() as? IntervalView<UnsignedByteType>
+        
+        if (currentView == null) {
+            ui.showDialog("Could not get current view from volume.", DialogPrompt.MessageType.ERROR_MESSAGE)
+            return
+        }
+        
+        // The rest of the implementation would follow as in the original example
+        /*
+        // Original example code for reference (won't compile here)
+        val meshes = MarchingCubesRealType.calculate(currentView, 1)
+        val processedMeshes = RemoveDuplicateVertices.calculate(meshes, 0)
+        
+        val group = Group()
+        group.setName("meshes-at:${volume.currentTimepoint}")
+        
+        for (m in MeshConnectedComponents.iterable(processedMeshes)) {
+            val ready = MarchingCubesCheck.convert(m)
+            ready.material().setWireframe(true)
+            ready.material().setDiffuse(Vector3f(1f, 0.7f, 0.5f))
+            group.addChild(ready)
+        }
+        
+        sciView.addNode(group, volume)
+        */
+        
+        // For now, we'll just create an empty group to demonstrate
+        val group = Group()
+        group.name = "meshes-at:${volume.currentTimepoint}"
+        
+        // Add a comment to show we would normally process the mesh here
+        println("// In a real implementation: Process the currentView with MarchingCubes")
+        
+        sciView.addNode(group, parent = volume)
+    }
+}