The intro to py5 and python tutorials have coding challenges at the end of each of them, but there is no answer key

[hx2A]

The intro to py5 and python tutorials have coding challenges at the end of each of them, but there is no answer key. Should there be one? Should it be on github?

https://py5coding.org/tutorials/intro_to_py5_and_python.html

[david-dunkley]

Yes and yes! I use py5 to teach creative coding and this would help a lot. It would show at least one way to solve the challenges and provide teachers with a good standard for learning, teaching, and grading.

[hx2A]

Great, I just added some Labels in hopes that someone is interested in working on this. I don't have time at the moment, but this seems like a good task that someone else could pick up and contribute to. @villares , do you know anyone who would be interested in working on this?

[villares]

Great! I'll ask around!

[david-dunkley]

Hi @villares & @hx2A This sounds great! Looking forward to helping y'all out and learning as well! Have a great weekend.

[villares]

@david-dunkley, I saw your email today, email is good.
For the record, it's about "chapter 10": https://py5coding.org/tutorials/intro_to_py5_and_python_11_trigonometry_for_animation.html#engine-task

I'll try to have a look this week!

[david-dunkley]

Hi @villares ,
Yes, 'Ch 10' Engine Task. 
Thanks for the message and I look forward to hearing from you!
Best,
David 

[villares]

'Ch 10' Engine Task.

Hi @david-dunkley!

See if this helps... I took the one I thought was closest and tried to "refactor". I think it can still be improved, but looks plausible...

#Ch 10 Engine Task 

theta = 0
radius = 30   # this was called speed but I think it is the radius!

def setup():
    size(600, 600)
    no_fill()
    stroke('#FFFFFF')
    stroke_weight(3)
    
def draw():
    global theta, radius
    theta -= 0.08
    background('#004477')
    #translate(width/2, height/2)  # let's try without this
    #circle and pison: side view
    push_matrix()        # backup the coordinate transforms
    translate(400, 200)  # this will be undone by pop_matrix()
    x = cos(theta)
    y = sin(theta)
    yc = 120  # center of the circle
    line(radius, yc, x * -radius + radius, y * radius + yc)
    diameter = radius * 2
    circle(radius, yc, diameter)
    #piston arm attached to inner arm: side view
    line( x + radius, y * radius + radius,
         -x * radius + radius, y * radius + yc)
    #piston body: side view 
    rect(x, y * radius, radius * 2, radius * 2)
    #piston body lines: side view
    line(x, y * radius + 15, x + radius * 2, y * radius + 15)
    line(x, y * radius + 10, x + radius * 2, y * radius + 10)
    line(x, y * radius + 5, x + radius * 2, y * radius + 5)
    pop_matrix() # resets coordinate transforms

    # working on the original coordinates: 0, 0, on top left corner    
    piston_body(50, 200, theta)
    piston_body(120, 200, theta + PI / 3)
    piston_body(190, 200, theta + 2 * PI / 3)
    
def piston_body(xp, yp, theta):
    #piston body
    x = cos(theta)
    y = sin(theta)
    push_matrix()
    translate(xp, yp)
    rect(-radius, y*radius*+1, radius * 2, radius * 2) 
    line(-radius, y*radius+5, radius, y*radius+5)
    line(-radius, y*radius+10, radius, y*radius+10)
    line(-radius, y*radius+15, radius, y*radius+15)
    line(0, y*radius+30, 0, y*radius+150)
    pop_matrix()