Enable a PVector interfacea as in Processing Python Mode

[berinhard]

This issue was created after #114 and the object is to have a PVector implementation as described by Processing's docs.

A possible approach is to add a PVector method to the pyp5js/pyp5js.py file to work a proxy for the p5.Vector implementation. Something similar to:

def PVectorAdd(c1, c2):
    return _P5_INSTANCE.Vector.add(c1, c2)

def PVector(x, y):
    return _P5_INSTANCE.createVector(x, y)

PVector.add = PVectorAdd

[villares]

Trying my hand on a wrapper here:
https://gist.github.com/villares/e639a34eef756beba2f79a55203cd51e

[villares]

Look how nice PVector tests! https://github.com/jdf/processing.py/blob/master/testing/resources/test_pvector.py

Another useful reference: https://github.com/jdf/processing.py/blob/master/runtime/src/jycessing/core.py

[villares]

Hi @berinhard, as in Transcrypt we won't get the operator overloading, what do you think of a very thin helper layer for p5.Vector using the PVector names?

Something like this:

from pyp5js import *

def setup():
    createCanvas(200, 200)
    background(160)

def draw():
    fill("blue")
    background(200)
    radius = sin(frameCount / 60) * 50 + 50
    
    v = PVector(100, 100)
    v.div(2)
    ellipse(v.x, v.y, radius, radius)
    v.add(30, 30)
    ellipse(v.x, v.y, radius, radius)
    w = PVector.add(v, PVector(50,0))
    ellipse(w.x, w.y, radius, radius)
    z = PVector.div(w, 2)
    ellipse(z.x, z.y, radius, radius)

def PVector(x=0, y=0, z=0):
    return createVector(x, y, z)

# only the class methods need aliases!
PVector.dist = p5.Vector.dist
PVector.add = p5.Vector.add
PVector.sub = p5.Vector.sub
PVector.mult = p5.Vector.mult
PVector.div = p5.Vector.div
PVector.dot = p5.Vector.dot
PVector.cross = p5.Vector.cross
PVector.lerp = p5.Vector.lerp
PVector.random2D = p5.Vector.random2D
PVector.random3D = p5.Vector.random3D
PVector.angleBetween = p5.Vector.angleBetween
PVector.fromAngle = p5.Vector.fromAngle
PVector.fromAngles = p5.Vector.fromAngles
PVector.equals = p5.Vector.equals

[berinhard]

This set of aliases is extremely valid IMHO! Give it a try @villares and I hope it'll work =)

[berinhard]

@villares don't know if this can help you, but here's how we're setting attrs to isolate python functions such as map, set and filter: https://github.com/berinhard/pyp5js/blob/develop/pyp5js/python_functions.py

[berinhard]

Fixed by #137