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COMP 106

COMP 106. Review- C# IDE The IDE Form Steps in making a program in C# The Compute Salary Program. Object-Orientation Object Class Properties and Methods C # classes in Microsoft .NET framework. COMP 106. Introductory Graphics First Drawing program Common Methods to draw

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COMP 106

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  1. COMP 106 • Review- C# IDE • The IDE • Form • Steps in making a program in C# • The Compute Salary Program • Object-Orientation • Object • Class • Properties and Methods • C # classes in Microsoft .NET framework

  2. COMP 106 • Introductory Graphics • First Drawing program • Common Methods to draw • Assignment 1 (10 marks)

  3. Menu bar IDE Form Toolbox Solution Explorer Properties

  4. Code window

  5. Program run…

  6. A misspelled word in your code/instructions will cause the compiler to display an error message

  7. When semi-colon is removed, the compiler says “ ; expected”

  8. What is an object • an entity which has properties/variables/fields • an entity which has methods- an action to be done by the object properties make size color date_manufactured date_shipped methods boot repair shutdown connect_to_net print A Dell computer

  9. What is a class • A class – set of objects that share the same properties and methods HP Dell Compaq class computer

  10. Pop quiz…  • Give me a class name of the following objects Angelina Bradd Catherine .5 bonus point to be added to your midterm test

  11. Pop quiz…  Give me some properties for the class Actor class celebrity methods properties screen_name real_name dateofbirth gross_income hire sign_contract act takeholiday resign

  12. className objectName = new className • To create an object from a class, • An object is an instance of a class Example Computer Dell = new Computer; Pen pen = new Pen(Color.Black); How would you create objects Angelina? Bradd? Catherine? Celebrity Angeline=new Celebrity; Celebrity Bradd=new Celebrity; Celebrity Catherine=new Celebrity;

  13. In C#, the standard format to get the value of the property is: data = object.propertyname Example its_color = Dell.color; c = pen.Color;

  14. To set the value of the property, object.propertyname = data; Example Dell.color=red; pen.color = black;

  15. To call or invoke the method of the object; object.methodname(arguments) Example Dell.Repair(); Dell.Sell(); Brad.Hire(); Catherine.Resign();

  16. Introductory Graphics • C# has existing classes : buttons, labels, forms, etc • The Microsoft .NET framework has hundreds of classes • Programmers can make use of classes to instantiate objects;

  17. Drawing.. • What object do we need? • paper • pen

  18. Let’s draw a rectangle… paper.DrawRectangle(pen to use, rectangle position, etc) We “invoke” or “call” the method “DrawRectangle” of object paper. Arguments or parameters needed to make a rectangle The method is called by placing a dot “.” between the object name and the method

  19. Actual code to draw a rectangle.. • Draw a button, a picturebox inthe form • Double click the button • Enter the following code { Graphics paper ; paper = pictureBox1.CreateGraphics(); Pen pen = new Pen(Color.Black); paper.DrawRectangle(pen, 10,10,100,50); paper.DrawRectangle(pen, 10,75,100,100); }

  20. Pixel coordinate in C# horizontal form picture box 0,0 vertical 100 0,0 200 shape in picture box

  21. Output after running the program… paper.DrawRectangle(pen, 10,10,100,50); paper.DrawRectangle(pen, 10,75,100,100);

  22. C# provides facilities to draw shapes: • lines • ellipses (i.e. ovals,circles) • filled rectangles and ellipses; • images from files. You can change the color of the pens and use brushes of a chosen color to fill shapes

  23. Methods for drawing shapes, lines, etc • DrawRectangle • a pen object; • the horizontal value of the top edge corner of the rectangle • the vertical value of the top left corner of the rectangle • the width of the rectangle • the height of the rectangle • DrawLine • a pen object; • the horizontal value of the start of the line • the vertical value of the start of the line • the horizontal value of the end of the line • the vertical value of the end of the line paper.Drawline(pen, 0,0,10,10);

  24. DrawEllipse –imagine the ellipse as an oval squeezed inside a rectangle • a pen object; • the horizontal value of the top edge corner of the rectangle • the vertical value of the top left corner of the rectangle • the width of the rectangle • the height of the rectangle

  25. FillRectangle –needs a brush object instead of a pen; • A brush object; • the horizontal value of the top edge corner of the rectangle • the vertical value of the top left corner of the rectangle • the width of the rectangle • the height of the rectangle Solidbrush myBrush = new Solidbrush(Color.black); paper.FillRectangle(myBrush,10,10,90,90);

  26. DrawImage – use to display a JPG or bitmap file • A bitmap object containing an image from a file • the horizontal value of the top edge corner of the rectangle • the vertical value of the top left corner of the rectangle • the width of the rectangle • the height of the rectangle Example code: Bitmap pic = new Bitmap(@”c:\myphoto.jpg”); paper.DrawImage(pic,130,10,150,150);

  27. Assignment 1 Due date : Friday, 18 Jan. email your program to rtg4@cs.waikato.ac.nz • Make a program that will draw the outer view of your flat/house. (put a picture of your own outside the house) • Make a program that will draw the “eye-bird’s” (inner) view of your flat/house . Include appliances and furniture only. (shapes does not need to be filled with colors)

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