# Sketch - A Python-based interactive drawing program
# Copyright (C) 1997, 1998, 1999, 2001 by Bernhard Herzog
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Arrows
#
import os
from types import TupleType,ListType
from math import atan2,sin,cos
from Sketch.warn import warn_tb,USER,pdebug
from Sketch import config
from Sketch import _,Trafo,CreatePath
from Sketch.loadres import read_resource_file
class Arrow:
def __init__(self, path, closed = 0):
self.path = CreatePath()
if type(path) in (ListType, TupleType):
for segment in path:
if len(segment) == 2:
apply(self.path.AppendLine, segment)
else:
apply(self.path.AppendBezier, segment)
else:
self.path = path
if closed:
self.path.load_close()
def BoundingRect(self, pos, dir, width):
try:
angle = atan2(dir.y, dir.x)
except ValueError:
angle = 0
if width < 1.0:
width = 1.0
s = width * sin(angle)
c = width * cos(angle)
trafo = Trafo(c, s, -s, c, pos.x, pos.y)
return self.path.accurate_rect(trafo)
def Draw(self, device, rect = None):
if self.path.closed:
device.FillBezierPath(self.path, rect)
else:
device.DrawBezierPath(self.path, rect)
def Paths(self):
return (self.path,)
def IsFilled(self):
return self.path.closed
def SaveRepr(self):
path = map(lambda t: t[:-1], self.path.get_save())
return (path, self.path.closed)
def __hash__(self):
return hash(id(self.path))
def __cmp__(self, other):
if __debug__:
pdebug(None, 'Arrow.__cmp__, %s', other)
if isinstance(other, self.__class__):
return cmp(self.path, other.path)
return cmp(id(self), id(other))
def read_arrows(filename):
arrows = []
def arrow(path, closed, list = arrows):
list.append(Arrow(path, closed))
dict = {'arrow': arrow}
read_resource_file(filename, '##Sketch Arrow 0',
_("%s is not an arrow definition file"), dict)
return arrows
std_arrows = None
def StandardArrows():
global std_arrows
if std_arrows is None:
filename = os.path.join(config.std_res_dir, config.preferences.arrows)
try:
std_arrows = read_arrows(filename)
except:
warn_tb(USER, _("Error trying to read arrows from %s\n"
"Using builtin defaults"), filename)
std_arrows = []
return std_arrows
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