def tessellate(contours):
""" Returns a list of triangulated (x,y)-vertices from the given list of path contours,
where each contour is a list of (x,y)-tuples.
The vertices can be drawn with GL_TRIANGLES to render a complex polygon, for example:
glBegin(GL_TRIANGLES)
for x, y in tessellate(contours):
glVertex3f(x, y, 0)
glEnd()
"""
id = repr(contours)
if id in _tessellate.cache:
return _tessellate.cache[id]
# Push the given contours to C and call gluTessVertex().
_tessellate.reset()
contours = [[(GLdouble * 3)(x, y, 0) for x, y in points]
for points in contours]
gluTessBeginPolygon(_tessellator, None)
for vertices in contours:
gluTessBeginContour(_tessellator)
for v in vertices:
gluTessVertex(_tessellator, v, v)
gluTessEndContour(_tessellator)
gluTessEndPolygon(_tessellator)
# Update the tessellation cache with the results.
if len(_tessellate.cache) > TESSELLATION_CACHE:
del _tessellate.cache[_tessellate.queue.pop(0)]
_tessellate.queue.append(id)
_tessellate.cache[id] = _tessellate.triangles
return _tessellate.triangles
def tessellate(contours):
""" Returns a list of triangulated (x,y)-vertices from the given list of path contours,
where each contour is a list of (x,y)-tuples.
The vertices can be drawn with GL_TRIANGLES to render a complex polygon, for example:
glBegin(GL_TRIANGLES)
for x, y in tessellate(contours):
glVertex3f(x, y, 0)
glEnd()
"""
id = repr(contours)
if id in _tessellate.cache:
return _tessellate.cache[id]
# Push the given contours to C and call gluTessVertex().
_tessellate.reset()
contours = [[(GLdouble * 3)(x, y, 0) for x, y in points] for points in contours]
gluTessBeginPolygon(_tessellator, None)
for vertices in contours:
gluTessBeginContour(_tessellator)
for v in vertices:
gluTessVertex(_tessellator, v, v)
gluTessEndContour(_tessellator)
gluTessEndPolygon(_tessellator)
# Update the tessellation cache with the results.
if len(_tessellate.cache) > TESSELLATION_CACHE:
del _tessellate.cache[_tessellate.queue.pop(0)]
_tessellate.queue.append(id)
_tessellate.cache[id] = _tessellate.triangles
return _tessellate.triangles
def perform_tessellation(self, data_lists):
gluTessBeginPolygon(tess, None)
for d_list in data_lists:
gluTessBeginContour(tess)
for v_data in d_list:
gluTessVertex(tess, v_data, v_data)
gluTessEndContour(tess)
gluTessEndPolygon(tess)
return self.tlist
def perform_tessellation(self, data_lists):
gluTessBeginPolygon(tess, None)
for d_list in data_lists:
gluTessBeginContour(tess)
for v_data in d_list:
gluTessVertex(tess, v_data, v_data)
gluTessEndContour(tess)
gluTessEndPolygon(tess)
return self.tlist
def tessellate(contours):
""" Returns a list of triangulated (x,y)-vertices from the given list of path contours,
where each contour is a list of (x,y)-tuples.
The vertices can be drawn with GL_TRIANGLES to render a complex polygon, for example:
glBegin(GL_TRIANGLES)
for x, y in tessellate(contours):
glVertex3f(x, y, 0)
glEnd()
"""
_tessellate.reset()
contours = [[(GLdouble * 3)(x, y, 0) for x, y in points] for points in contours]
gluTessBeginPolygon(_tessellator, None)
for vertices in contours:
gluTessBeginContour(_tessellator)
for v in vertices:
gluTessVertex(_tessellator, v, v)
gluTessEndContour(_tessellator)
gluTessEndPolygon(_tessellator)
return _tessellate.triangles