CS 151 Project 9

Project 9: Non-Photorealistic Rendering

Main course Moodle page

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.

    Make a file taskA.py that draws three copies of one of your shapes from last week. Show the shape drawn in 'normal', 'jitter', and 'jitter3' style.

    An image with three copies of a shape in different styles is required image 1.

  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.

    Make a file taskB.py that generates a collection of shapes that show the 'normal', 'jitter', 'jitter3', and 'dotted' drawing modes. Your writeup should point out which examples are which.

    An image of the collection of shapes in four different styles is required image 2.

  3. Make a copy of your indoor scene code--or create a brand new scene--from last week and put it in a new file taskC.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 indoor scene is required image 3.

  4. 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 4.


Extensions

Each assignment will have a set of suggested extensions. The required tasks constitute about 85% of the assignment, and if you do only the required tasks and do them well you will earn a B+. To earn a higher grade, you need to undertake one or more extensions. The difficulty and quality of the extension or extensions will determine your final grade for the assignment. One complex extension, done well, or 2-3 simple extensions are typical.


Writeup and Hand-in

Turn in your code by putting it into your private handin directory on the Courses server. All files should be organized in a folder titled "Proj9" and you should include only those files necessary to run the program. We will grade all files turned in, so please do not turn in old, non-working, versions of files.

Make a new wiki page for your assignment. Put the label cs151s13project9 in the label field on the bottom of the page. But give the page a meaningful title (e.g. Stephanie's project 9).

In general, your intended audience for your write-up is your peers not in the class. Your goal should be to be able to use it to explain to friends what you accomplished in this project and to give them a sense of how you did it. Follow the outline below.