Re: [Visualpython-users] Dethe Elza's icosahedron demo code

[Dethe E. <de...@al...>]

Hi Stephen,

I see that in the archived message too.  Since the extra "3D"s and "=" were
not in the original code (it ran fine before I sent it) I assume that they
were introduced as an artifact of my mailer or sending it as an attachment
(gotta switch from Outlook).

Below is the current version, no attachment this time.  I've improved the
color cycling to improve performance a bit.

--Dethe

------------------------

from visual import *

class ico:
    def __init__(self):
        f = frame()

        root5 = 5.0 ** 0.5
        phi = (1.0 + root5)/2.0
        tau = 1.0/phi
        points =
[(1.0,phi,0.0),(-1.0,phi,0.0),(-1.0,-phi,0.0),(1.0,-phi,0.0),

(0.0,1.0,phi),(0.0,-1.0,phi),(0.0,-1.0,-phi),(0.0,1.0,-phi),

(phi,0.0,1.0),(phi,0.0,-1.0),(-phi,0.0,-1.0),(-phi,0.0,1.0)]
        self.buildColorTable()
        self.vertexColorIndex = 400 # blue
        self.edgeColorIndex = 0 # red
        self.faceColorIndex = 200 # green
        self.vertexColor = self.colorTable[self.vertexColorIndex]
        self.edgeColor = self.colorTable[self.edgeColorIndex]
        self.faceColor = self.colorTable[self.faceColorIndex]

        self.vertices = []
        for point in points:
            self.vertices.append(sphere(frame=f, pos=point, radius=0.4,
color=self.vertexColor))

        ico_edge_indices = [
            (0,1),(0,7),(0,9),(0,8),(0,4),
            (1,7),(7,9),(9,8),(8,4),(4,1),
            (7,10),(10,1),(1,11),(11,4),(4,5),
            (5,8),(8,3),(3,9),(9,6),(6,7),
            (10,11),(11,5),(5,3),(3,6),(6,10),
            (2,10),(2,11),(2,5),(2,3),(2,6)]
        self.edges = []
        for edge in ico_edge_indices:
            v1 = vector(points[edge[0]])
            v2 = vector(points[edge[1]])
            v3 = v2 - v1
            self.edges.append(cylinder(frame=f, pos=v1, axis=v3, radius=0.1,
color=self.edgeColor))

        face_list =
[0,9,7,6,10,2,11,5,4,8,0,9,0,1,7,10,0,4,1,11,10,6,2,3,5,8,11,2,10,6]
        solid = []
        for index in face_list:
            solid.append(points[index])
        self.faces = convex(frame=f, pos = solid, color=self.faceColor)
        self.frame =  f

    def rotate(self, angle=None):
        self.frame.rotate(angle=angle, axis=(0.0,0.0,-1.0))

    def buildColorTable(self):
        self.colorTable = []
        red = 1.0
        green = 0.0
        blue = 0.0
        for i in range(100):
            self.colorTable.append((red,green,blue))
            green = green + 0.01
        for i in range(100):
            self.colorTable.append((red,green,blue))
            red = red - 0.01
        for i in range (100):
            self.colorTable.append((red,green,blue))
            blue = blue + 0.01
        for i in range(100):
            self.colorTable.append((red,green,blue))
            green = green - 0.01
        for i in range (100):
            self.colorTable.append((red,green,blue))
            red = red + 0.01
        for i in range(99):
            self.colorTable.append((red,green,blue))
            blue = blue - 0.01
        self.maxcolorindex = len(self.colorTable)

    def cycleColors(self):
        self.cycleVertexColors()
        self.cycleEdgeColors()
        self.cycleFaceColors()

    def cycleIndex(self, index):
        index = index + 1
        if index >= self.maxcolorindex:
          index = 0
        return index

    def cycleVertexColors(self):
        self.vertexColorIndex = self.cycleIndex(self.vertexColorIndex)
        self.vertexColor = self.colorTable[self.vertexColorIndex]
        for vertex in self.vertices:
            vertex.color = self.vertexColor

    def cycleEdgeColors(self):
        self.edgeColorIndex = self.cycleIndex(self.edgeColorIndex)
        self.edgeColor = self.colorTable[self.edgeColorIndex]
        for edge in self.edges:
            edge.color = self.edgeColor

    def cycleFaceColors(self):
        self.faceColorIndex = self.cycleIndex(self.faceColorIndex)
        self.faceColor = self.colorTable[self.faceColorIndex]
        self.faces.color = self.faceColor


def main():
    i = ico()
    while 1:
        rate(30)
        i.rotate(0.05)
        i.cycleColors()

if __name__ == '__main__':
    main()