add constrain functionality

Author: monkstone

arcball.gemspec

@@ -1,6 +1,10 @@
+# -*- encoding: utf-8 -*-
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'arcball/version'
 Gem::Specification.new do |s|
   s.name = 'arcball'
-  s.version = '0.0.1'
+  s.version = ArcBall::VERSION
   s.licenses = ['GPL-3.0']
   s.has_rdoc = false
   s.extra_rdoc_files = ['README.md', 'LICENSE.md']
@@ -16,4 +20,3 @@ Gem::Specification.new do |s|
   s.platform='java'
   s.rubygems_version = %q{2.5.2}
 end
-

lib/arcball.jar

@@ -1,5 +1,5 @@
 # encoding: utf-8
 # frozen_string_literal: true
 module ArcBall
-  VERSION = '0.0.1'.freeze
+  VERSION = '0.0.2'.freeze
 end

lib/arcball/version.rb

@@ -1,7 +1,7 @@
 require 'fileutils'
 project 'arcball', 'https://github.com/ruby-processing/ArcBall' do
   model_version '4.0.0'
-  id 'arcball:arcball', '0.0.1'
+  id 'arcball:arcball', '0.0.2'
   packaging 'jar'
   description 'arcball for arcball'
   organization 'ruby-processing', 'https://ruby-processing.github.io'

pom.rb

@@ -11,7 +11,7 @@ DO NOT MODIFIY - GENERATED CODE
   <modelVersion>4.0.0</modelVersion>
   <groupId>arcball</groupId>
   <artifactId>arcball</artifactId>
-  <version>0.0.1</version>
+  <version>0.0.2</version>
   <name>arcball</name>
   <description>arcball for arcball</description>
   <url>https://github.com/ruby-processing/ArcBall</url>

pom.xml

@@ -100,6 +100,21 @@ public Arcball(PApplet parent) {
         camera = true;
         this.axis = Constrain.FREE; // no constraints...
     }
+    
+     /**
+     * Default centered arcball and half width or half height whichever smaller
+     *
+     * @param parent PApplet
+     * @param axis Constrain
+     *
+     */
+    public Arcball(PApplet parent, Constrain axis) {
+        // this(parent, axis, parent.width / 2.0f, parent.height / 2.0f, Math.min(parent.width, parent.height) * 0.5f);
+        this(parent, 0f, 0f, Math.min(parent.width, parent.height) * 0.8f);
+        parent.camera(parent.width / 2.0f, parent.height / 2.0f, (parent.height * DEPTH), 0, 0, 0, 0, 1.0f, 0);
+        camera = true;
+        this.axis = axis; // custom constrain...
+    }
 
     /**
      * mouse event to register

src/monkstone/arcball/Arcball.java

@@ -11,17 +11,17 @@
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
- * 
+ *
  *  You should have received a copy of the GNU General Public License
  *  along with this program.  If not, see http://www.gnu.org/licenses.
  */
-
 package monkstone.arcball;
 
 import org.jruby.Ruby;
 import org.jruby.RubyClass;
 import org.jruby.RubyModule;
 import org.jruby.RubyObject;
+import org.jruby.RubySymbol;
 import org.jruby.anno.JRubyClass;
 import org.jruby.anno.JRubyMethod;
 import org.jruby.runtime.Arity;
@@ -83,6 +83,31 @@ public static void init(ThreadContext context, IRubyObject self, IRubyObject arg
         if (count == 1) {
             PApplet parent = (PApplet) args[0].toJava(PApplet.class);
             new Arcball(parent).setActive(true);
-        }        
+        }
+    }
+
+    /**
+     *
+     * @param context
+     * @param self
+     * @param args optional (no args jx = 0, jy = 0)
+     */
+    @JRubyMethod(name = "constrain", meta = true, rest = true, required = 1, optional = 1)
+
+    public static void constrain(ThreadContext context, IRubyObject self, IRubyObject args[]) {
+        int count = Arity.checkArgumentCount(context.getRuntime(), args, 1, 2);
+        RubySymbol zaxis = RubySymbol.newSymbol(context.getRuntime(), "zaxis");
+        RubySymbol xaxis = RubySymbol.newSymbol(context.getRuntime(), "xaxis");
+        PApplet parent = (PApplet) args[0].toJava(PApplet.class);
+        if (count == 2) {
+            if (xaxis == args[1]) {
+                new Arcball(parent, Constrain.XAXIS).setActive(true);
+            }
+            if (zaxis == args[1]) {
+                new Arcball(parent, Constrain.ZAXIS).setActive(true);
+            }
+        } else {
+            new Arcball(parent, Constrain.YAXIS).setActive(true);
+        }
     }
 }