Programming Games

1
Programming Games

• Work / finish and show dice game. Extras. Timed
  events.
• ftp. index file.
• Homework Catch up and do slide show.

2
Dice game additions

• Score keeping for dice game can be done using the
  notion of a bankroll, kept as internal variable
  and displayed as part of form.
• Initial starting amount, sayvar bankr 100
• On every first moveif (bankrgt10) bankr -
  10 else
• On every win bankr 20NOTE nothing happens
  when there is a loss.
• Also need to displaydocument.f.bank.value
  bankr // conversion done

3
Timed events

• JavaScript provides functions for setting up
  timed events
• setInterval ('moveit(dx,dy)',500)tid
  setInterval('change()',800)setInterval(change,80
  0)setTimeout(finish,2000) //just happens
  oncetid setInterval(finish,2000)
  clearInterval(tid)

4
Timed events

• The coding is different, but the underlying
  concept is the same as other events
• set up handling for event do something,
  generally invoke a function, when something
  happens
• write the event handler function
• event can be stopped, for the timing event, that
  means a call to clearInterval using the value set
  by the call to setInterval or setTimeout.

5
Exercises

• Set up a timed event to be a call to
  "stopgame()" to happen once in 10 seconds? one
  and one half seconds?
• What do you think stopgame is?
• Set up timed events to be a call to
  "moveit(dx,dy)" to happen 10 times/second until
  your code stops it?

6
Slide show

• Use form buttons to start and stop the slide
  show.
• Starting the slide show is done by a function
  that contains a call to setInterval.
• Stopping the slide show is done by a function
  that contains a call to clearInterval.
• The change function advances the slide show using
  a variable sn and then incrementing sn. The sn
  variable is reset back to zero when it reaches
  the endpointing past the end of the array
  holding the names of the slide image files.

7
Reprise Your server site

• students.purchase.edu
• Use what is termed an ftp (file transfer
  protocol) program to upload and download files.
• Filezilla, others
• If you are or anticipate taking other computer
  classes, make a folder games or pg

8
Server site, cont.

• Create an index.html file
• The action by the browser to an incomplete
  address will be to look for an index.html file
• http//faculty.purchase.edu/jeanine.meyergoes to
  my index.html file.
• Your index.html files can be simple. Use ltbrgt or
  ltpgt and lt/pgt or ltolgtltligt lt/ligt lt/olgt etc.

9
index.html

• lthtmlgtltheadgtlttitlegtJeanine's games
  lt/titlegtlt/headgtltbodygtltulgtltligtlta
  href"favoritesites.html"gtMy favorite sites lt/agt
  lt/ligtltligtlta href"cointoss.html"gtCoin
  tosslt/agtlt/ligtlt/ulgtlt/bodygtlt/htmlgt

10
Upload

• index.html
• all files for each of your games
• Make sure they are in the correct folder.
• NOTE you don't use the web in the address.
• TEST to see if you get to the index file and then
  if the link to each game works and the game works!

11
Homework

• finish dice game
• Continue uploading projects to your site
• Read tutorial, examine code, acquire image files,
  and complete slide show.