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#############################################################
## ##
## Copyright (c) 2003-2011 by The University of Queensland ##
## Earth Systems Science Computational Centre (ESSCC) ##
## http://www.uq.edu.au/esscc ##
## ##
## Primary Business: Brisbane, Queensland, Australia ##
## Licensed under the Open Software License version 3.0 ##
## http://www.opensource.org/licenses/osl-3.0.php ##
## ##
#############################################################
"""Defines the L{Arrow} class"""
from esys.lsm.vis import core
from Cylinder import Cylinder
from Cone import Cone
from Csg import Union
from Modifier import Modifiable
class Arrow(core.Arrow, Modifiable):
def __init__(self, tailPt, headPt, tailRadius, headRadius, headLength):
core.Arrow.__init__(
self,
tailPt,
headPt,
tailRadius,
headRadius,
headLength
)
Modifiable.__init__(self)
def writeSdl(self, f):
tailPt = core.Vec3(self.getTailPt())
tipPt = core.Vec3(self.getHeadPt())
dir = tipPt - tailPt
arrowLength = dir.norm()
if (arrowLength > 0.0):
u = Union()
dir = dir/arrowLength
basePt = tipPt - dir*self.getHeadLength()
if (arrowLength > self.getHeadLength()):
u.append(
Cylinder(
endPt1=tailPt,
endPt2=basePt,
radius=self.getTailRadius()
)
)
u.append(
Cone(basePt=basePt, tipPt=tipPt, radius=self.getHeadRadius())
)
u.apply(self.getModifierList())
u.writeSdl(f)
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