CS 151: Project #3

Project 3: Scenes within Scenes

Main course page

The purpose of this assignment is to incorporate loops and conditionals into your code as well as provide more practice in encapsulating code and concepts for later re-use and manipulation.


For this lab you will be re-writing a number of functions from your shapes.py file from lab 2. It's probably best to start fresh and copy over only those functions that don't have to change. The goto function is an example of a function you can copy and paste into the new file.

  1. Create a new file called things.py. Copy over the goto and block functions from your shapes.py file. Add a parameter called fill to the block function.

    First, re-write the block function to take advantage of looping.

    Second, edit the block function so that if the fill variable has the value True, then the block should be filled. If the fill variable has the value False, then the block should not be filled. You will need to use an if-statement before and after the drawing commands for your block.

    Don't forget to appropriately comment your functions.

  2. For at least 2 more of your basic shape functions, copy them to your things.py file, edit them to use loops wherever it makes sense and give them a fill parameter that controls whether the shape is filled or not.
  3. For at least 2 of your more complex shapes, copy them to your things.py file, rewrite them using the new functions with the fill parameter and take advantage of looping wherever possible. If you wish, use conditional statements to enable variations on the complex shapes. For example, you can make any function call dependent upon a random number using the following type of test. In the example below, the block will be drawn 70% of the time.
        if random.random() < 0.7:
            block( x, y, w, h, True )
  4. Pick one of your scenes from lab 2 (or create a new outdoor scene, if you wish). Copy it to your things.py file and re-write it so the entire scene is parameterized by an x, y location and a scale parameter. In other words, you should be able to have your scene draw anywhere on the screen at any size.

    Create a task1.py file that imports things.py and uses the scene function to draw several versions of the scene. Use a command line parameter to control some aspect of the program, such as the number of scenes drawn. The first required picture is an image with three differently sized versions of your outdoor scene.

  5. Create a task2.py file that creates a simple indoor scene. As part of the indoor scene, make your outdoor scene appear as a window or painting within the indoor scene. Keep the indoor scene inside a function, and use a command line parameter to control some aspect of the image. This image is the second required picture.



Make a new wiki page for your assignment. Put the label cs151S10proj3 on the page. Each of you needs to make your own writeup.

In addition to making the wiki page writeup, put the python files you wrote on the Academics server in your handin directory.

Colby Wiki

In general, your writeup should follow the outline below.