feat: Adding draw method to the scenenode class

SFMLEngine/makingAGameTick/makefile

@@ -1,4 +1,4 @@
-CXXFLAGS = -Wextra -Wall -Wfloat-equal -Wundef -Wshadow -Wpointer-arith -Wcast-align -Wstrict-overflow=5 -Wwrite-strings -Wcast-qual -Wunreachable-code -pedantic -Wswitch-default
+CXXFLAGS = -Wextra -Wall -Wfloat-equal -Wundef -Wshadow -Wpointer-arith -Wcast-align -Wstrict-overflow=5 -Wwrite-strings -Wcast-qual -Wunreachable-code -pedantic -Wswitch-default -Wno-unused-parameter
 # https://stackoverflow.com/a/3376483
 
 compile:./game.cpp

SFMLEngine/makingAGameTick/scenenode.cpp

@@ -30,4 +30,22 @@ SceneNode::ScenePointer SceneNode::detachChild(const SceneNode& node) // finds n
   return result; // and we return the pointer to the node
 }
 
+void SceneNode::drawCurrent(sf::RenderTarget& target, sf::RenderStates states) const
+{
+  
+}
+
+void SceneNode::draw(sf::RenderTarget& target, sf::RenderStates states) const
+{
+  states.transform *= getTransform();
+  // *= combines the parent's absolute transform with the relative one of the current node;
+  // states.transform contains the absolute world transform
+  drawCurrent(target, states); // now we can draw the derived object using states, this is similar to how sf::Sprite handles transforms
+
+  for (const ScenePointer& child : mChildren)
+  {
+    child -> draw(target, states); // we also need to draw all the child nodes
+  }
+}
+
 #endif

SFMLEngine/makingAGameTick/scenenode.hpp

@@ -18,7 +18,7 @@ class SceneNode : public sf::Transformable, public sf::Drawable, private sf::Non
     // Virtual functions are member functions whose behavior can be overridden in derived classes
     // draw() function allows our class to be used like this:
     /*
-    sf::RenderWindow window(...);
+    sf::RenderWindow window(...); // window class calls our draw() function
     SceneNode::ScenePointer node(...);
     window.draw(*node);
     */