notes on drawer

README.md

@@ -84,9 +84,37 @@ Todo
 - **Files**
 
   [drawer.hpp](include/drawer.hpp), [drawer.cpp](src/drawer.cpp)
+
 - **Description**
   
-  A `Drawer` is an object that can draw segments to the screen. It handles single touch of the `Zeichnen` functionality.
+  A `Drawer` is an object that can draw segments to the screen. 
+  It handles single touch of the `Zeichnen` functionality. 
+  Note that this class relies on the caller to its methods to take care of the Opengl state (using shaders, binding buffers, etc.). 
+  See `DrawingHandler` for more information on how this class is to be used.
+
+- **Constructors and Destructors**
+    - `Drawer(Toolbox&)`
+    - `Drawer(const Drawer&)`
+    - `~Drawer()`
+
+- **Public Function Members**
+    - `void start_drawing(const float x, const float y)`
+    - `bool draw(const float x, const float y, Toolbox& tb, bool drawing)`
+    - `void redraw(Toolbox&)`
+    - `void erase(const float x, const float y, Toolbox& tb)`
+    - `int num_drawn()`
+
+- **Private Function Members**
+    - `bool calculate_points_(Toolbox& tb, bool drawing)`
+
+- **Public Data Members**
+
+- **Private Data Members**
+    - `float x0_, y0_, x1_, y1_`
+    - `int num_drawn_`
+    - `std::vector<float> points_`
+
+- **Notes**
 ### DrawingHandler (`drawing_handler.hpp`, `drawing_handler.cpp`)
 Todo
 ### EfficientBlock (`efficient_block.hpp`, `efficient_block.cpp`)