""" Here's the kind of thing I'm using with my middle and high schoolers in class tomorrow, to help 'em get their feet wet with Python + VPython. Students have already slogged through Dog and Monkey as subclasses of Mammal before getting here. We replace Mammal with Vector, conceptually, and talk more about vectors as 'math objects' with a graphical representation, not just a lexical one. In stickworks.py, said Vector class is tail originating at (0,0,0), but we're able to edge-connect any two vector tips with an Edge. We use IDLE to import and run test(), with no need to close the VPython window between loops. The boilerplate the follows suggests easy extension to other VPython primitives, i.e. provides a sandbox and just enough sand for beginning coders to copy and/or elaborate upon. """ # ==== viztoyz.py ===== """ Kirby Urner 4D Solutions Apr 27 2007 Simple framework for studying VPython primitives plus an imported Vector & Edge, wrapper classes from my stickworks.py http://www.4dsolutions.net/ocn/stickworks.html """ from visual import sphere, color, display, cylinder from random import randint from stickworks import Vector, Edge red = color.red green = color.green blue = color.blue def makespheres(n=100): for i in range(n): # a loop x, y, z = randint(-10, 10), randint(-10,10), randint(-10,10) theball = sphere(pos=(x,y,z), # linebreak OK cuz within ( ) radius = 0.1 * randint(1,5), color = [red, blue, green][randint(0,2)]) def makecyls(n=100): for i in range(n): # a loop x, y, z = randint(-10, 10), randint(-10,10), randint(-10,10) thecyl = cylinder(pos=(0,0,0), axis=(x,y,z), radius = 0.1 * randint(1,5), # decimalize color = [red, blue, green][randint(0,2)]) def maketent(): """ Imagine a cube centered at the origin and with a positive octant vertex at (1,1,1). Inscribe a regular tetrahedron as six face diagonals therein. """ # 4 vertices a = Vector((-1, -1, 1)) b = Vector((-1, 1, -1)) c = Vector((1, 1, 1)) d = Vector((1, -1, -1)) # 6 edges tetrahedron = [Edge(a,b), Edge(b,c), Edge(c,d), Edge(a,c), Edge(a,d), Edge(b,d)] for e in tetrahedron: e.draw() def sometest(): pass def test(): # create a scene window scene2 = display(title='Some VPython Tests', width=600, height=600, center=(0,0,0), background=(0,1,1)) """list the functions""" thetests = [ makespheres, # balloon qyoob makecyls, # silly cyls maketent, # tetra tent sometest] # user defined, could be any number while True: print """ Choose: 0 Balloon Qyoob 1 Silly Cyls 2 Tetra Tent 3 ... your test goes here Q Outta here! """ ans = raw_input('Choice? ') if ans in 'Qq': break # trap more errors here thetests[int(ans)]() # perform user selection (or crash?) print "View output, hit Enter to continue..." # pause to look in the VPython window ok = raw_input() for obj in scene2.objects: # erase all objects obj.visible = False # outta here scene2.visible = False # destroy the scene window return # null