def runGluTesselator(nodes):
from OpenGL import GL
from OpenGL import GLU
shapes = []
vertexes = []
def begin(shape):
assert shape == GL.GL_LINE_LOOP
shapes.append([])
def vertex(vertex):
if vertex is None:
vertex = vertexes.pop()
shapes[-1].append(vertex)
def error(args):
print "error", args
def combine(coords, vertex_data, weight, theTuple):
vertexes.append(coords)
return coords
#def end(*args, **kwargs):
# pass
tess = GLU.gluNewTess()
GLU.gluTessCallback(tess, GLU.GLU_TESS_BEGIN, begin)
GLU.gluTessCallback(tess, GLU.GLU_TESS_VERTEX, vertex)
GLU.gluTessCallback(tess, GLU.GLU_TESS_COMBINE_DATA, combine)
GLU.gluTessCallback(tess, GLU.GLU_TESS_ERROR_DATA, error)
#GLU.gluTessCallback(tess, GLU.GLU_TESS_END_DATA, end)
GLU.gluTessProperty(tess, GLU.GLU_TESS_WINDING_RULE,
GLU.GLU_TESS_WINDING_NEGATIVE)
#GLU.gluTessProperty(tess, GLU.GLU_TESS_WINDING_RULE, GLU.GLU_TESS_WINDING_NONZERO)
GLU.gluTessProperty(tess, GLU.GLU_TESS_BOUNDARY_ONLY, GLU.GLU_TRUE)
GLU.gluTessProperty(tess, GLU.GLU_TESS_TOLERANCE, 1.0 / 2048.0)
GLU.gluTessNormal(tess, 0.0, 0.0, 1.0)
GLU.gluBeginPolygon(tess, None)
def tweaked(p):
return (int(p.x() * 1024) / 1024.0, int(p.y() * 1024) / 1024.0, 0)
for n in nodes:
GLU.gluTessVertex(tess, (tweaked(n.start)), (n.start.x(), n.start.y()))
GLU.gluEndPolygon(tess)
res = []
for s in shapes:
nodes = []
for i in range(len(s)):
p1 = s[i]
p2 = s[(i + 1) % len(s)]
nodes.append(
DrawingLine(QPointF(p1[0], p1[1]), QPointF(p2[0], p2[1])))
res.append(DrawingPolyline(nodes))
return res
