ENGR/CS 101 CS Session Lecture 6 Log into Windows/ACENET (reboot if - - PowerPoint PPT Presentation

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Aug 16, 2022 307 likes •430 views

ENGR/CS 101 CS Session Lecture 6 Log into Windows/ACENET (reboot if in Linux) Start Microsoft Visual Studio 2012 Open DotChaser project Can everyone's game have a dot that moves periodically, and can start, stop, and reset?

SLIDE 1

ENGR/CS 101 CS Session Lecture 6

 Log into Windows/ACENET (reboot if in

Linux)

 Start Microsoft Visual Studio 2012  Open DotChaser project  Can everyone's game have a dot that moves

periodically, and can start, stop, and reset?

Lecture 6 ENGR/CS 101 Computer Science Session 1

SLIDE 2

Outline

 Continue Dot Chaser game project

 Game state

 If-statements

 Enhancements

Lecture 6 ENGR/CS 101 Computer Science Session 2

SLIDE 3

Game State

 What should the game do if the user clicks on

the dot when the game is stopped?

Lecture 6 ENGR/CS 101 Computer Science Session 3

SLIDE 4

If-Statements

 We only want to execute the dot click handler

code only when the game has been started.

 We do this with an if-statement.

Lecture 6 ENGR/CS 101 Computer Science Session 4

SLIDE 5

If-Statements

 An if-statement has:

 A condition test  A body to execute when the test is true  An optional body to execute when the test is false

 We can used it to decide whether to process a

dot click

1. If the game is active

1.1 Compute the new score 1.2 Update the score display 1.3 Move the dot

Lecture 6 ENGR/CS 101 Computer Science Session 5

SLIDE 6

If-Statements

 The syntax of a C# if-statement is: if (<condition>) { <body to execute when condition is true> } else // this part is optional { <body to execute when condition is false> }

Lecture 6 ENGR/CS 101 Computer Science Session 6

SLIDE 7

Game State

 A condition is an expression that is either

true or false

 We can add a boolean variable flag to

represent the game state. The flag is true when the game is started and false when the game is stopped.

 In C#, bool is the type of a boolean variable

bool active; // game state

Lecture 6 ENGR/CS 101 Computer Science Session 7

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Game State

 The values a C# boolean variable may have

are true and false.

 The started flag is initialized to false in the

constructor so that the game is stopped when first launched.

 The Start and Stop button click handlers set

the active flag to true and false, respectively.

Lecture 6 ENGR/CS 101 Computer Science Session 8

SLIDE 9

Game State

 The dot Click handler should test that the

game is started before updating the game

state. That is, if the game is stopped, the dot

Click handler should do nothing.

if (active) { // process the dot click }

Lecture 6 ENGR/CS 101 Computer Science Session 9

SLIDE 10

Game Enhancements

 Here are some of the previously suggested

ther game rules

 Occasionally have a "bomb" (a dot of a different

color that you don't want to click) that either ends game or loses points

 Make the dot move faster after some number of

points

 Lose points if don't click the dot before move or

clicks in the game area

 Change colors after some number of clicks

Lecture 6 ENGR/CS 101 Computer Science Session 10

SLIDE 11

Game Enhancements

 Here are some other ideas for game

enhancements:

 Dot becomes smaller after some number of clicks  Game ends or "pauses" (i.e. stops) if no click after

some number of moves

 Game ends if fewer than 20 points in 1 minute

Lecture 6 ENGR/CS 101 Computer Science Session 11

SLIDE 12

Game Enhancements

 Here are some ideas for implementing these

new rules

 Add integer variables to count things  Add Timer variables to keep track of time

 Will need to add a handler for each Timer object

 Update counters or Timers when handling dot

clicks or Timer moves

 Test counter values in an if-statement to

determine if something needs to be done

Lecture 6 ENGR/CS 101 Computer Science Session 12