Objectives

For the project, you'll need to implement two more styles of drawing. To implement a new style, you just need to add another case to the if statement in the forward method of the Interpreter class.

The last step in the project is to enhance your scene from the last project by making use of the various styles you implement this week. You should be able to run the scene with different styles with minimal changes to your code.

Tasks

  1. Implement a style 'jitter3' that draws the line segment as three, criss-crossing jittered lines. The implementation is similar to the 'jitter' case, but instead of drawing one line, you draw three. All three lines should begin at a point that is a short, random distance from the turtle's initial position and end at at a point that is a short, random distance from the desired end point.

    This will involve several goto statements, e.g.

        jx = random.gauss(0,self.jitterSigma)
        jy = random.gauss(0,self.jitterSigma)
        turtle.goto( x0+jx, y0+jy )
    			
    For each goto statement, the jx and jy values should be regenerated from a Gaussian distribution (random.gauss) with a zero mean and jitterSigma as the standard deviation. They should not all be the same.

  2. Create a 'dotted' style that draws a series of circles separated by spaces. Create a field in the TurtleInterpreter to hold the dotSize (the radius of the circle). You'll also need a setDotSize method in the TurtleInterpreter class and a setDotSize method and associated dotSize field in the Shape class, just as we did with the setStyle and setJitter information.
  3. Make a file demo_line_styles.py that draws multiple copies of one of your shapes from last week. Show the shape drawn in 'normal', 'jitter', and 'jitter3', and 'dotted' styles. For the normal style, draw shapes with at least 2 different line widths. For jitter and jitter3 styles, draw shapes with at least 2 different jitter sigmas. For the dotted style, draw shapes with at least 2 different dot sizes.

    An image demonstrated your different styles is required image 1.

  4. Make a copy of your Colby scene code--or create a brand new scene--from last week and put it in a new file colby_scene.py. Edit your scene so that it makes use of the different drawing styles. Feel free to enhance it, but focus on enhancements that make use of the different drawing styles and shape classes you've created. When you are done, you should have something that looks a bit more like a real painting or drawing.

    The updated Colby scene is required image 2.

  5. Make your own new parameterized stochastic multi-rule L-system. You can create a variation on one of the given files or look in ABOP for inspiration. If you create a variation, you need to do more than just add ornaments (berries or leaves). You need to make the shape structurally different so the difference is obvious.

    Your new L-system does not have to be a tree, but it does need to include branching, multiple rules, and at least one rule with more than one replacement string. Describe the L-system you designed in your writeup and explain your design choices. Make a scene or image that includes your L-system.

    A picture of the new L-system is required image 3.


Extension Examples

These are just examples, not necessarily recommendations. Please feel welcome and encouraged to design your own. A great extension genuinely interests you, pushes your understanding of CS, and inspires you to learn something new.


Writeup

Make a new wiki page for your assignment. Put the label cs151s18project10 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 Courses server in your private directory in a folder named project10.

Colby Wiki

In general, your writeup should follow the outline below.


© 2018 Caitrin Eaton.