From eb0ee795a749a49c437da8f8963448aebb7cd015 Mon Sep 17 00:00:00 2001
From: "Kae..pl" <Kaelthas_Spellsinger@o2.pl>
Date: Tue, 4 Mar 2014 18:09:36 +0000
Subject: [PATCH] Feature: added support for 'Maintain volume' constraint.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@11068 75d07b2b-3a1a-0410-a2c5-0572b91ccdca
---
 .../ConstraintDefinitionFactory.java          |  2 +-
 .../ConstraintDefinitionMaintainVolume.java   | 45 +++++++++++++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 engine/src/blender/com/jme3/scene/plugins/blender/constraints/definitions/ConstraintDefinitionMaintainVolume.java

diff --git a/engine/src/blender/com/jme3/scene/plugins/blender/constraints/definitions/ConstraintDefinitionFactory.java b/engine/src/blender/com/jme3/scene/plugins/blender/constraints/definitions/ConstraintDefinitionFactory.java
index fba5ef1e4..cbf727290 100644
--- a/engine/src/blender/com/jme3/scene/plugins/blender/constraints/definitions/ConstraintDefinitionFactory.java
+++ b/engine/src/blender/com/jme3/scene/plugins/blender/constraints/definitions/ConstraintDefinitionFactory.java
@@ -52,6 +52,7 @@ public class ConstraintDefinitionFactory {
         CONSTRAINT_CLASSES.put("bSizeLimitConstraint", ConstraintDefinitionSizeLimit.class);
         CONSTRAINT_CLASSES.put("bKinematicConstraint", ConstraintDefinitionIK.class);
         CONSTRAINT_CLASSES.put("bTransLikeConstraint", ConstraintDefinitionTransLike.class);// since blender 2.51
+        CONSTRAINT_CLASSES.put("bSameVolumeConstraint", ConstraintDefinitionMaintainVolume.class);// since blender 2.53
     }
 
     private static final Map<String, String>                                UNSUPPORTED_CONSTRAINTS = new HashMap<String, String>();
@@ -73,7 +74,6 @@ public class ConstraintDefinitionFactory {
         UNSUPPORTED_CONSTRAINTS.put("bPivotConstraint", "Pivot");
         // Blender 2.56+
         UNSUPPORTED_CONSTRAINTS.put("bTrackToConstraint", "Track to");
-        UNSUPPORTED_CONSTRAINTS.put("bSameVolumeConstraint", "Same volume");
         // Blender 2.62+
         UNSUPPORTED_CONSTRAINTS.put("bCameraSolverConstraint", "Camera solver");
         UNSUPPORTED_CONSTRAINTS.put("bObjectSolverConstraint", "Object solver");
diff --git a/engine/src/blender/com/jme3/scene/plugins/blender/constraints/definitions/ConstraintDefinitionMaintainVolume.java b/engine/src/blender/com/jme3/scene/plugins/blender/constraints/definitions/ConstraintDefinitionMaintainVolume.java
new file mode 100644
index 000000000..75ee9fcbc
--- /dev/null
+++ b/engine/src/blender/com/jme3/scene/plugins/blender/constraints/definitions/ConstraintDefinitionMaintainVolume.java
@@ -0,0 +1,45 @@
+package com.jme3.scene.plugins.blender.constraints.definitions;
+
+import com.jme3.math.Transform;
+import com.jme3.scene.plugins.blender.BlenderContext;
+import com.jme3.scene.plugins.blender.constraints.ConstraintHelper.Space;
+import com.jme3.scene.plugins.blender.file.Structure;
+
+public class ConstraintDefinitionMaintainVolume extends ConstraintDefinition {
+    private static final int FLAG_MASK_X = 0;
+    private static final int FLAG_MASK_Y = 1;
+    private static final int FLAG_MASK_Z = 2;
+
+    private float            volume;
+
+    public ConstraintDefinitionMaintainVolume(Structure constraintData, Long ownerOMA, BlenderContext blenderContext) {
+        super(constraintData, ownerOMA, blenderContext);
+        volume = (float) Math.sqrt(((Number) constraintData.getFieldValue("volume")).floatValue());
+    }
+
+    @Override
+    public void bake(Space ownerSpace, Space targetSpace, Transform targetTransform, float influence) {
+        if (volume != 1 && influence > 0) {
+            Transform ownerTransform = this.getOwnerTransform(ownerSpace);
+            switch (flag) {
+                case FLAG_MASK_X:
+                    ownerTransform.getScale().multLocal(1, volume, volume);
+                    break;
+                case FLAG_MASK_Y:
+                    ownerTransform.getScale().multLocal(volume, 1, volume);
+                    break;
+                case FLAG_MASK_Z:
+                    ownerTransform.getScale().multLocal(volume, volume, 1);
+                    break;
+                default:
+                    throw new IllegalStateException("Unknown flag value: " + flag);
+            }
+            this.applyOwnerTransform(ownerTransform, ownerSpace);
+        }
+    }
+
+    @Override
+    public String getConstraintTypeName() {
+        return "Maintain volume";
+    }
+}