Course: CSCI 207 Problem Solving and Programming Using Visual Basic® Lecture 23: OOD/OOP – Designing the next class in the drawing hierarchy Edinboro University of PA. Distance and Online Learning Professor: Stanley T. Schuyler, D.Sc. CSCI Lecture 23S. T. Schuyler, D.Sc.1

Lecture 23 - Objectives Review and Revise the Data Hierarchy Diagram Develop the Class Test and Demonstrate Operation of the Class Move up the class hierarchy to the level – A drawing is an instance of a collection of – We want to establish this class – Add that may contain exactly 1 (so far – before we expand to line objects) – Be able to erase and redraw them CSCI Lecture 23S. T. Schuyler, D.Sc.2

DATA Decomposition for Drawing Application – V2 CSCI Module 43S. T. Schuyler, D.Sc.3 Drawing Surface,, …,,,

Module 45: Summary of Module 44 In the Last Module we: – Added the Class Pt and tested it will draw a digitized x,y pt – Added an “Erase” event What we didn’t do: – Is keep the points around (none stored) CSCI Module 44S. T. Schuyler, D.Sc.4

DATA Decomposition for Drawing Application – V2 CSCI Module 43S. T. Schuyler, D.Sc.5 Drawing Surface DrawingSet1,, …,,, PictureBox1 Single Instance of the Class Class Declaration Instance

DATA Decomposition for Drawing Application – V2 CSCI Module 43S. T. Schuyler, D.Sc.6 Drawing Surface DrawingSet1,, …,,, PictureBox1 Single Instance of the Class Class Declaration Instance

Module 45 Summary Composed the Class – Developed the AddGeometry() method – Developed the AddPoint() method – Developed the Draw() Method Instantiated a single Instance Demonstrated a User level Add Point Operation – Add, Draw – Erase – Redraw CSCI Module 45S. T. Schuyler, D.Sc.7