Fluent interface for Object transformation.

Now you can use method chaining while setting Object transformation -
scale, rotation, translation and parent.

src/Object.cpp

@@ -21,9 +21,9 @@ using namespace std;
 
 namespace Magnum {
 
-void Object::setParent(Object* parent) {
+Object* Object::setParent(Object* parent) {
     /* Skip if nothing to do or this is scene */
-    if(_parent == parent || _parent == this) return;
+    if(_parent == parent || _parent == this) return this;
 
     /* Add the object to children list of new parent */
     if(parent != nullptr) {
@@ -31,7 +31,7 @@ void Object::setParent(Object* parent) {
         /* Only Fry can be his own grandfather */
         Object* p = parent;
         while(p != nullptr && p->parent() != p) {
-            if(p == this) return;
+            if(p == this) return this;
             p = p->parent();
         }
 
@@ -46,6 +46,7 @@ void Object::setParent(Object* parent) {
     _parent = parent;
 
     setDirty();
+    return this;
 }
 
 Matrix4 Object::absoluteTransformation(Camera* camera) {
@@ -93,11 +94,12 @@ Scene* Object::scene() {
     return nullptr;
 }
 
-void Object::setTransformation(const Matrix4& transformation) {
-    if(_parent == this) return;
+Object* Object::setTransformation(const Matrix4& transformation) {
+    if(_parent == this) return this;
 
     _transformation = transformation;
     setDirty();
+    return this;
 }
 
 void Object::setDirty() {

src/Object.h

@@ -74,7 +74,7 @@ class MAGNUM_EXPORT Object {
         inline const std::set<Object*>& children() { return _children; }
 
         /** @brief Set parent object */
-        void setParent(Object* parent);
+        Object* setParent(Object* parent);
 
         /**
          * @brief Transformation matrix
@@ -96,7 +96,7 @@ class MAGNUM_EXPORT Object {
         virtual Matrix4 absoluteTransformation(Camera* camera = nullptr);
 
         /** @brief Set transformation matrix */
-        void setTransformation(const Matrix4& transformation);
+        Object* setTransformation(const Matrix4& transformation);
 
         /**
          * @brief Multiply transformation matrix
@@ -107,8 +107,9 @@ class MAGNUM_EXPORT Object {
          *
          * Multiplies current transformation matrix by new matrix.
          */
-        inline void multiplyTransformation(const Matrix4& transformation, bool global = true) {
+        inline Object* multiplyTransformation(const Matrix4& transformation, bool global = true) {
             setTransformation(global ? transformation*_transformation : _transformation*transformation);
+            return this;
         }
 
         /**
@@ -116,8 +117,9 @@ class MAGNUM_EXPORT Object {
          *
          * Same as calling multiplyTransformation() with Matrix4::translation().
          */
-        inline void translate(Vector3 vec, bool global = true) {
+        inline Object* translate(Vector3 vec, bool global = true) {
             multiplyTransformation(Matrix4::translation(vec), global);
+            return this;
         }
 
         /**
@@ -125,8 +127,9 @@ class MAGNUM_EXPORT Object {
          *
          * Same as calling multiplyTransformation() with Matrix4::scaling().
          */
-        inline void scale(Vector3 vec, bool global = true) {
+        inline Object* scale(Vector3 vec, bool global = true) {
             multiplyTransformation(Matrix4::scaling(vec), global);
+            return this;
         }
 
         /**
@@ -134,8 +137,9 @@ class MAGNUM_EXPORT Object {
          *
          * Same as calling multiplyTransformation() with Matrix4::rotation().
          */
-        inline void rotate(GLfloat angle, Vector3 vec, bool global = true) {
+        inline Object* rotate(GLfloat angle, Vector3 vec, bool global = true) {
             multiplyTransformation(Matrix4::rotation(angle, vec), global);
+            return this;
         }
 
         /** @{ @name Caching helpers