def _calculateCapData(self, scale=400.0):
"""Calculate the tessellated data-sets for this glyph"""
vertices = [[
vertex.Vertex(point=(x / scale, y / scale, 0.0))
for (x, y) in outline
] for outline in self.outlines]
gluTessNormal(self.tess.controller, 0, 0, 1.0)
contours = self.tess.tessContours(vertices, forceTriangles=0)
return [(t, asarray([v.point for v in vertices], 'd'))
for t, vertices in contours]
def renderCap(self, scale=400.0):
"""The cap is generated with GLU tessellation routines...
"""
vertices = [
vertex.Vertex((x / scale, y / scale, 0)) for (x, y) in outline[::2]
]
vertices.reverse()
for type, vertices in self.tess.tessellate(vertices, forceTriangles=0):
glNormal(0, 0, -1)
glColor3f(1, 0, 0)
glBegin(type)
for v in vertices:
glVertex2dv(v.point[:2])
glEnd()
def polygons(self, sources=None):
"""Yield each polygon in the IFS
The polygon object is a sub-class of list holding
Vertex objects.
"""
if sources is None:
sources = self.buildIndexedSources()
current = []
metaIndex = -1
polygonIndex = 0
coordIndices = self.target.coordIndex
points = getXNull(self.target.coord, 'point')
for metaIndex in xrange(len(coordIndices)):
point = coordIndices[metaIndex]
if point >= 0:
if point >= len(coordIndices):
log.info(
"""Coordindex of node %s declares index %s at meta-index %s, beyond end of coordinate set (len %s), ignoring""",
self.target, point, metaIndex, len(coordIndices))
continue
set = dict([(s.vertexAttribute, s(metaIndex, polygonIndex)[0])
for s in sources[1:]])
set['indexKey'] = tuple(
[s.vertexIndex(metaIndex, polygonIndex) for s in sources])
current.append(
vertex.Vertex(point=points[point],
metaIndex=metaIndex,
coordIndex=point,
**set))
else:
yield polygon.Polygon(
polygonIndex,
self.target,
current,
ccw=self.target.ccw,
)
polygonIndex += 1
current = []
if current:
yield polygon.Polygon(polygonIndex,
self.target,
current,
ccw=self.target.ccw)