CS 174 Discussion 2

1
CS 174 Discussion 2

• TA Gianfranco Doretto

2
Reminders

• Sign and turn in the academic honesty policy no
  homework will be graded if you do not do so!
• Let me know your preferred email address (grading
  notification)
• Forward your email
• Use the mailing list cs174.1_at_seas.ucla.edu
• Keep an eye on the class website

3
OpenGL in the Lab

• For all your labs, you should NOT use any opengl
  or glut functions other than the ones already
  available in the sample program provided
  (opengl.cc)
• login to NT box
• click on Xsession ugrad.seas (Solaris) icon on
  the desktop
• login again (same login name and password)
• invoke a window manager (choose it from the
  option menu)
• ftp or copy the skeleton.tar.gz tarball from
  local machine to your UNIX directory

4
OpenGL at Home

• download and unzip the file glutLibs.zip
• place the file glut.h in the folder C\Program
  Files\Microsoft Visual Studio\VC98\Include\GL
• place the file glut.dll in the folder
  C\WINDOWS\system32
• place the file glut32.dll in the folder
  C\WINDOWS\system32
• place the file glut.lib in the folder C\Program
  Files\Microsoft Visual Studio\VC98\Lib
• place the file glut32.lib in the folder
  C\Program Files\Microsoft Visual
  Studio\VC98\Lib

5
UNIX Tutorial

• Have a look at the FAQ of the class web page

6
Submission guidelines

• Due 4/25/2002 at 600pm 
• No partial credit will be given to programs which
  cannot be compiled and tested on ugrad.seas
  (Solaris)
• submit a tarball source code files, Makefile,
  input script files, README etc.
• Example your files are located in (HOME)/lab1
• 1) cd /  
• 2) tar cvf lab1.tar lab1
• 3) gzip lab1.tar
• 4) submit cs174 lab1.tar.gz 
• After you hit the return key, a statement like
  "submission successful" will be printed on the
  screen

7
README file

• submit a README file with each lab, only if you
  are doing the extra credit stuff, or if you are
  doing something different from what is mentioned
  in the lab description handout.  Also, mention
  what assumptions you have made to get your lab
  running.
• Your name appeared in UCLA record,
• Your student ID,
• Your preferred email address
• Your seas login ID,
• Date and Lab number.

8
Surce files

• In particular, you must put down the following
  information at the top of each program file.
• Your name appeared in UCLA record
• Your student ID
• Your preferred email address
• Your seas login ID
• Date and Lab number

9
Makefile

• In case your makefile gives an error while
  compiling, try the following command from the
  command line (everything on one line) 
• g -I/usr/local/glut-3.7b/include -I/usr/include
  -I/usr/local/gcc-2.95.2/include/g-3 -I./
  -L/usr/local/glut-3.7b/lib/glut
  -L/usr/lpp/OpenGL/lib -L/lib -L/usr/lib -lGLw
  -lGLU -lGL -lglut -lXm -lXt -lXext -lX11 -lXmu
  -lm -o opengl opengl.cc

10
What does the sample program do?

• It starts up a window of size 400x300, and clears
  it.
• Press the left mouse button ? a dot is plotted
• Release the left button ? another dot is plotted
• Press the right or the middle mouse button, a
  message is printed out
• k-q exits the program
• Bring up a larger or smaller window (opengl 500
  500" will bring up a window of size 500x500)

11
k-L (20)

• Puts in line drawing mode. A line should be drawn
  between every two consecutive points you
  left-click on the window
• Midpoint algorithm works for slopes between 0 and
  1
• Generalizing the algorithm is your job!

12
k-P (30)

• Puts in polygon drawing mode
• A line should be drawn between the current
  (left-clicked) point and previous (left-clicked)
  point. End the sequence of points using the
  right-click. Complete the polygon by drawing a
  line between the last point and the first point

13
k-C (10)

• Clear the window

14
k-Q (10)

• close the window and quit the program

15
Any other keys (10)

• print out an appropriate message, notifying the
  user of the invalid key

16
Moving/rise window (20)

• Your program should be able to handle lowering
  and raising of the drawing window. Basically,
  redraw the contents of the window whenever you
  raise or move your window
• You do not need to use dynamic data structures to
  store an indefinite number of objects (such as
  points, line, circles, polygons, etc.)
• If you want to add some more credits you can
  handle also the reshaping using the
  glutReshapeFunc() (look at the code posted on the
  web for an example that use this function)

17
Moving/rise window (20)

• For the purposes of refreshing your screen
  (during redraw, etc.), you will need to store
  information about the lines, polygons, and
  circles.
• Assume an upper limit to each of these
• max of lines 100
• max of polygons 100
• max of lines per polygons 25
• max of circles 100

18
Extra credit k-F (10)

• Fill the polygon with RED color

19
Extra credit Circle drawing (10)

• Add circle drawing functionality to your program
• Mark the center of the circle with a
  middle-click, then drag the mouse (holding the
  middle mouse button down), and release the middle
  mouse button, when you reach the size (radius) of
  the circle.

20
Demo

• Skeleton
• Example 1
• Example 2
• Example 3