Initial creation of the Node Update Callback.

CMakeLists.txt

@@ -203,6 +203,7 @@ set(VMIX_SRCS
     Shader.cpp
     ImageShader.cpp
     ImageProcessingShader.cpp
+    UpdateCallback.cpp
     Scene.cpp
     Primitives.cpp
     Mesh.cpp

Scene.cpp

@@ -35,6 +35,13 @@ Node::Node() : initialized_(false), visible_(true), refcount_(0)
 Node::~Node ()
 {
 
+    std::list<UpdateCallback *>::iterator iter;
+    for (iter=update_callbacks_.begin(); iter != update_callbacks_.end(); )
+    {
+        UpdateCallback *callback = *iter;
+        iter = update_callbacks_.erase(iter);
+        delete callback;
+    }
 }
 
 void Node::copyTransform(Node *other)
@@ -47,12 +54,13 @@ void Node::copyTransform(Node *other)
     translation_ = other->translation_;
 }
 
-void Node::update( float )
+void Node::update( float dt)
 {
-    std::list<Node::NodeUpdateCallback>::iterator iter;
+    std::list<UpdateCallback *>::iterator iter;
     for (iter=update_callbacks_.begin(); iter != update_callbacks_.end(); iter++)
     {
-        (*iter)(this);
+        if ((*iter)->enabled())
+            (*iter)->update(this, dt);
     }
 
     // update transform matrix from attributes

Scene.h

@@ -12,7 +12,7 @@
 #include <vector>
 #include <map>
 
-#include "GlmToolkit.h"
+#include "UpdateCallback.h"
 
 // Forward declare classes referenced
 class Shader;
@@ -73,9 +73,8 @@ public:
     glm::vec3 scale_, rotation_, translation_;
 
     // animation update callbacks
-    typedef void (* NodeUpdateCallback)(Node *);
-    // list of functions to call at each update
-    std::list<NodeUpdateCallback> update_callbacks_;
+    // list of callbacks to call at each update
+    std::list<UpdateCallback *> update_callbacks_;
 };
 
 
@@ -91,7 +90,7 @@ public:
  * should fill the points, colors and texture coordinates
  * in their constructor.
  *
- * Primitive can be given a shader that is used during draw.
+ * Primitive can be given a shader th0at is used during draw.
  *
  */
 class Primitive : public Node {

UpdateCallback.cpp

@@ -0,0 +1,30 @@
+#include "UpdateCallback.h"
+
+#include "Scene.h"
+
+#include <glm/gtc/type_ptr.hpp>
+
+UpdateCallback::UpdateCallback() : enabled_(true)
+{
+
+}
+
+void MoveToCenterCallback::update(Node *n, float dt)
+{
+    // set start position on first run or upon call of reset()
+    if (!initialized_){
+        initial_position_ = n->translation_;
+        initialized_ = true;
+    }
+
+    // calculate amplitude of movement
+    float percent = dt / duration_;
+
+    // perform movement : translation to the center (0, 0)
+    n->translation_ = initial_position_ - percent * initial_position_;
+
+    // detect end of movement
+    if ( glm::distance(initial_position_, n->translation_) < 0.1f) {
+        disable();
+    }
+}

UpdateCallback.h

@@ -0,0 +1,36 @@
+#ifndef UPDATECALLBACK_H
+#define UPDATECALLBACK_H
+
+#include "GlmToolkit.h"
+
+class Node;
+
+class UpdateCallback
+{
+    bool enabled_;
+
+public:
+    UpdateCallback();
+
+    virtual void update(Node *, float) = 0;
+
+    inline bool enabled() const {return enabled_;}
+    inline void enable() { enabled_ = true; }
+    inline void disable() { enabled_ = false; }
+};
+
+class MoveToCenterCallback : public UpdateCallback
+{
+    float duration_;
+    bool initialized_;
+    glm::vec3 initial_position_;
+
+public:
+    MoveToCenterCallback(float duration = 1000.f) : duration_(duration), initialized_(false) {}
+
+    void update(Node *n, float dt);
+
+    inline void reset() { initialized_ = false; }
+};
+
+#endif // UPDATECALLBACK_H