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--- tutorials:create-groimp-plugin [2024/12/06 07:37] – [New file filter] gaetan
+++ tutorials:create-groimp-plugin [2024/12/06 08:54] (current) – gaetan
@@ Line 1: / Line 1: @@
 This tutorial aims at showing how to get started on GroIMP plugin development. It is assumed that you are able to compile the plugin using Maven (either the plugin alone, or the whole project).
-In this tutorial we are going to create a new plugin (from the empty template), add a new MimeType (format of file accepted by GroIMP) for both import and export, and add a menu item that run a specific command.
+In this tutorial we are going to create a new plugin (from the empty template), add a new MimeType (format of file accepted by GroIMP) for import, and add a menu item that run a specific command.
 See:
@@ Line 253: / Line 253: @@
 	requires graph;
 	requires imp3d;
+        requires imp;
+        requires utilities;
 </code>
@@ Line 283: / Line 285: @@
 Open GroIMP, create a new project, import the file and look at the result.
+==== New command ====
+In this section we will create a GroIMP command callable from a menu item that will create a random chain of Cylinders and adds it to the graph.
+=== Create the command ===
+In the java directory create a new file called ''Commands.java'' and fill it with:
+<code java>
+package de.grogra.template.tutorial;
+import de.grogra.graph.Graph;
+import de.grogra.graph.impl.Node;
+import de.grogra.imp3d.objects.Cylinder;
+import de.grogra.pf.registry.Item;
+import de.grogra.pf.ui.Context;
+public class Commands {
+	public static void randomCylinders(Item item, Object info, Context ctx) {
+		Node n = new Node();
+		Node last = n;
+		for(int i=0;i<5;i++) {
+			float length =  (float) (0.5f + Math.random() * (2 - 0.5));
+			float radius = (float) (0.1f + Math.random() * (0.4 - 0.1));
+			Cylinder c = new Cylinder(length, radius);
+			last.addEdgeBitsTo(c, Graph.BRANCH_EDGE, null);
+			last = c;
+		}
+		IMP.addNode(null, n, ctx);
+	}
+}
+</code>
+To be callable from the GUI, GroIMP commands needs to be //public//, //static//, and as their return value is not used //void//.
+The parameters //Item, Object, Context// are the default and most used ones.
+=== Create a menu item ===
+Now that the command exists in java, it needs to be referenced in the registry to be accessible from GroIMP GUI.
+Open the ''plugin.xml'' file from the resources and add (within the <registry> tags):
+<code xml>
+    <directory name="tutorial">
+   	<directory name="tutorial">
+		<command name="createRandomCylinders" run="de.grogra.template.tutorial.Commands.randomCylinders"/>
+   	</directory>
+   </directory>
+    <ref name="hooks">
+		<ref name="complete">
+				<ref name="project">
+				<insert target="/workbench/menu/src" resolveLinks="false">
+					<link source="/tutorial/tutorial" />
+				</insert>
+			</ref>
+		</ref>
+	</ref>
+</code>
+The tag '' <directory name="tutorial"> '' creates a directory in the registry, which can be used latter by GroIMP or users. In this directory we create a ''<command />'' tag that point at the command implementation in java.
+Then, the hooks > complete > project defines what happens when a GroIMP project is open. In this case at ''/workbench/menu/src'' (i.e. the menu bar) we insert the directory previously created.
+=== Use from GroIMP ===
+Now that the command has been implemented and added to the menu bar, compile the plugin and replace the old one.
+Open GroIMP and a new project.
+{{:tutorials:tuto_menu.png?400|}}
+=== Add an option ===
+The previous command is creating a chain of five cylinders. Instead of using a fixed number we can add a GroIMP option to let the user define the number.
+Options are defined in the registry. In the ''plugin.xml'' file. We need to modify slightly the directory "tutorial created in the previous section:
+<code xml>
+   <directory name="tutorial"  optionCategory="true">
+   	<directory name="tutorial">
+		<command name="createRandomCylinders" run="de.grogra.template.tutorial.Commands.randomCylinders"/>
+   	</directory>
+   	  <command name="options">
+   	     	  <option name="numberOfCylinders" type="java.lang.Integer" value="5"/>
+   	  </command>
+   </directory>
+</code>
+The directory is now using the parameter //optionCategory// , which will make it visible in the panel //preferences// of GroIMP. And the tag ''<option />'' is defining a new option with a type and a default value.
+{{:tutorials:tuto_addoption.png?400|}}
+Now we change the java code that was creating the Cylinders to use the value of this option. In the file ''Commands.java'', change the method :
+<code java>
+import de.grogra.util.Utils;
+public class Commands {
+public static void randomCylinders(Item item, Object info, Context ctx) {
+  Node n = new Node();
+  Node last = n;
+  Item ite = Item.resolveItem(item.getRegistry(), "/tutorial/options");
+  int nbOfCylinders = (int) Utils.get(ite, "numberOfCylinders", 5);
+  for(int i=0;i<nbOfCylinders;i++) {
+	float length =  (float) (0.5f + Math.random() * (2 - 0.5));
+	float radius = (float) (0.1f + Math.random() * (0.4 - 0.1));
+	Cylinder c = new Cylinder(length, radius);
+	last.addEdgeBitsTo(c, Graph.BRANCH_EDGE, null);
+	last = c;
+  }
+  IMP.addNode(null, n, ctx);
+}
+}
+</code>