def sphere2(nx, ny, r=1, bot=-90, top=90):
"""Return a sphere consisting of line elements.
A sphere with radius r is modeled by a regular grid of nx
longitude circles, ny latitude circles and their diagonals.
The 3 sets of lines can be distinguished by their property number:
1: diagonals, 2: meridionals, 3: horizontals.
The sphere caps can be cut off by specifying top and bottom latitude
angles (measured in degrees from 0 at north pole to 180 at south pole.
"""
base = Formex('l:543', [1, 2, 3]) # single cell
d = base.select([0]).replic2(nx, ny, 1, 1) # all diagonals
m = base.select([1]).replic2(nx, ny, 1, 1) # all meridionals
h = base.select([2]).replic2(nx, ny + 1, 1, 1) # all horizontals
grid = m + d + h
s = float(top - bot) / ny
return grid.translate([0, bot / s, 1]).spherical(scale=[360. / nx, s, r])
def __init__(self,text,pos,gravity=None,size=18,width=None,font=None,lineskip=1.0,grid=None,texmode=4,**kargs):
"""Initialize the Text actor."""
# split the string on newlines
text = str(text).split('\n')
# set pos and offset3d depending on pos type (2D vs 3D rendering)
pos = at.checkArray(pos)
if pos.shape[-1] == 2:
rendertype = 2
pos = [pos[0],pos[1],0.]
offset3d = None
else:
rendertype = 1
offset3d = Coords(pos)
pos = [0.,0.,0.]
if offset3d.ndim > 1:
if offset3d.shape[0] != len(text[0]):
raise ValueError("Length of text(%s) and pos(%s) should match!" % (len(text),len(pos)))
# Flag vertex offset to shader
rendertype = -1
# set the font characteristics
if font is None:
font = FontTexture.default(size)
if isinstance(font,(str,unicode)):
font = FontTexture(font,size)
if width is None:
#print("Font %s / %s" % (font.height,font.width))
aspect = float(font.width) / font.height
width = size * aspect
self.width = width
# set the alignment
if gravity is None:
gravity = 'E'
alignment = ['0','0','0']
if 'W' in gravity:
alignment[0] = '+'
elif 'E' in gravity:
alignment[0] = '-'
if 'S' in gravity:
alignment[1] = '+'
elif 'N' in gravity:
alignment[1] = '-'
alignment = ''.join(alignment)
# record the lengths of the lines, join all characters
# together, create texture coordinates for all characters
# create a geometry grid for the longest line
lt = [ len(t) for t in text ]
text = ''.join(text)
texcoords = font.texCoords(text)
if grid is None:
grid = Formex('4:0123').replic(max(lt))
grid = grid.scale([width,size,0.])
# create the actor for the first line
l = lt[0]
g = grid.select(range(l)).align(alignment,pos)
Actor.__init__(self,g,rendertype=rendertype,texture=font,texmode=texmode,texcoords=texcoords[:l],opak=False,ontop=True,offset3d=offset3d,**kargs)
for k in lt[1:]:
# lower the canvas y-value
pos[1] -= font.height * lineskip
g = grid.select(range(k)).align(alignment,pos)
C = Actor(g,rendertype=rendertype,texture=font,texmode=texmode,texcoords=texcoords[l:l+k],opak=False,ontop=True,offset3d=offset3d,**kargs)
self.children.append(C)
# do next line
l += k