Attendance at the lab session on Monday, February 13, is worth 20 points. It is recorded separately from the lab grade.

This is an individual / team lab. Every student is expected to do the individual activity by themselves and submit it before the lab period. Then the team is supposed to work together on a problem to get the team product and submit that.

Educational goals of this lab - verify that every student can

• write some graphics code in Python

INSTRUCTIONS:

1. (35 points) Individual Problem: Trying some graphics
   • (10 points) Use the graphics library to draw a building of some type - a barn, a tent, a house, a church, an arena, a factory, etc.
   • (10 points) It must use at least 5 different objects. Some of the objects can be of the same type, using more than one "line" or "ellipse" for example.
   • (5 points) It must use at least two colors (besides black and white!).
   • (5 points) Remember your prolog.
   • Here is an example (not a great one!). Of course, do not duplicate this one! Use your creativity here!
   • (5 points) Make SURE that you end your program with the code that will ask the user to "Click to end program", wait for a mouse click and then close the graphics window. This habit will save you LOTS of headaches later!
   • Submit your finished program with this link.
   • It is due by Sunday February 12, midnight. If you turn it in after midnight but before the start of your lab, you will lose 5 points. After that you will lose all the points.

2. (35 points) Team Problem: Done during lab on Monday, February 13
   • Everyone on your team should get their number for their grade web page from their TA and show that they can find their grade web page with a browser.
   • Here is a program that will ask the user for four points, draw two straight line segments between the 4 points and calculate the intersection of the lines represented by the line segments. Here is one sample run of the program:

     The Great Intersection Finder
     
     Enter the x and y for the first point on line 1
     X1, Y1  5, 17
     Enter the x and y for the second point on line 1
     X2, Y2  3, 9
     Enter the x and y for the first point on line 2
     X1, Y1  1,1
     Enter the x and y for the second point on line 2
     X2, Y2  5, 5
     Line 1: ( 5 , 17 ) and ( 3 , 9 )
     Equation of Line 1: y = 4.0 x +  -3.0
     Line 2: ( 1 , 1 ) and ( 5 , 5 )
     Equation of Line 2  y = 1.0 x +  0.0
     
     Point of intersection = (  1.0 , 1.0 )
     

   • The team's job is to take this program and add the following things to it.
     • a graphics window at least 400 by 500 pixels (use any name you like)
     • let the user click on the four points' locations instead of typing in the numbers. Assume they will click in the same order that the numbers were typed in in the original program.
     • draw one small (radius = 3) circle centered at each of the 4 points' locations. These should be red.
     • draw the two line segments specified by the four points
     • draw a larger circle centered at the intersection's location. The radius should be 5. The circle should be green. Note that the intersection may NOT actually lie on one of the line segments. The equations actually find the intersection of the lines that the line segments are part of. This is perfectly ok! The green circle may appear anywhere on the screen or even off the screen!
     • Leave all the output to the shell about the points' locations, lines and the intersection, just as it is.
     • The program should pause at the end until the user clicks on the graphics window with the mouse.
   • Submit your finished program with this link. Use the Lab 6 and Code menu choices.
3. (10 points) Team Demo: (viewed during lab meeting)
   • Show your program to your TA before the end of the lab.

   When you are finished with this lab, you should have:

   • submitted individually a program that draws a building
   • submitted as a team, a program that finds the intersection of two line segments and gives the results graphically as well as in the shell.
   • shown your team results to your TA during lab

   Log off properly - you don't want your account misused by someone else!

   Remember NOT to leave files on the local hard drives in this lab or anywhere else on campus! Make sure you save your projects on the Locker drive or onto a portable storage device you take with you!

   Submission Deadlines:

   Individual work submitted by February 12 Sunday, midnight
   Team work submitted by February 13 Monday, during lab