##############################################################################
# ThanCad 0.0.9 "DoesSomething": 2dimensional CAD with raster support for engineers.
#
# Copyright (c) 2001-2009 Thanasis Stamos, August 23, 2009
# URL: http://thancad.sourceforge.net
# e-mail: cyberthanasis@excite.com
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details (www.gnu.org/licenses/gpl.html).
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
"""\
ThanCad 0.0.9 "DoesSomething": 2dimensional CAD with raster support for engineers.
This module defines circle states, i.e. as the user moves the mouse, a circle or
an arc are drawn, continuously.
"""
from math import hypot,atan2,pi
import Tkinter
from thantkconst import *
from thanvar import thanLogTk
from thantkguigeneric import ThanStateGeneric
class ThanStateCircle(ThanStateGeneric):
"An object which interprets mouse movements to a circle."
def __init__(self, proj, x1, y1):
"Initialize object."
self.thanProj = proj
self.__x1 = x1
self.__y1 = y1
dc = self.thanProj[2].thanCanvas
dc.thanOrtho.enable(x1, y1) # Ortho is disabled in thanCleanup in stateless mixin
self.__dragged = dc.create_line(10000, 10000, 10001, 10001) # Dummy element to avoid complexity in onMotion()
dc.thanTempItems.add(self.__dragged)
def thanOnMotion(self, event, x, y):
"Well, here is what should be drawn each time mouse moves."
dc = self.thanProj[2].thanCanvas
xb, yb = dc.thanOrtho.orthoxy(x, y)
r = hypot(xb-self.__x1, yb-self.__y1)
i1 = self.__dragged
self.__dragged = dc.create_oval(self.__x1-r, self.__y1+r, self.__x1+r, self.__y1-r,
outline = "blue")
dc.delete(i1)
dc.thanTempItems.remove(i1)
dc.thanTempItems.add(self.__dragged)
def thanOnClick(self, event, x, y, cc):
"Well, here is what should be done when mouse clicks."
dc = self.thanProj[2].thanCanvas
dc.delete(self.__dragged)
dc.thanTempItems.remove(self.__dragged)
dc.thanLastResult = cc, None
dc.thanState = THAN_STATE_NONE
dc.thanOState = ThanStateGeneric(self.thanProj)
def thanZoomXyr(self, x, y, fact):
"Change internal coordinates according to zoom; this fuction should be in the state objects."
self.__x1 = x + (self.__x1-x)*fact
self.__y1 = y + (self.__y1-y)*fact
class ThanStateArc(ThanStateGeneric):
"An object which interprets mouse movements to arcs."
def __init__(self, proj, x1, y1, r1, t1):
"Initialize object."
self.thanProj = proj
self.__x1 = x1
self.__y1 = y1
self.__r1 = r1
self.__t1 = t1
dc = self.thanProj[2].thanCanvas
dc.thanOrtho.enable(x1, y1) # Ortho is disabled in thanCleanup in stateless mixin
self.__dragged = (dc.create_line(10000, 10000, 10001, 10001),) # Dummy element to avoid complexity in onMotion()
for i1 in self.__dragged:
dc.thanTempItems.add(i1)
def thanOnMotion(self, event, x, y):
"Well, here is what should be drawn each time mouse moves."
dc = self.thanProj[2].thanCanvas
xb, yb = dc.thanOrtho.orthoxy(x, y)
theta1 = self.__t1 / pi * 180
theta2 = atan2(-(yb-self.__y1), xb-self.__x1) / pi * 180
draggedp = self.__dragged
self.__dragged = (dc.create_arc(self.__x1-self.__r1, self.__y1+self.__r1,
self.__x1+self.__r1, self.__y1-self.__r1,
start=theta1, extent=(theta2-theta1)%360.0, style=Tkinter.ARC,
outline = "blue"),
dc.create_line(self.__x1, self.__y1, x, y, fill="blue"),
)
for i1 in draggedp:
dc.delete(i1)
dc.thanTempItems.remove(i1)
for i1 in self.__dragged:
dc.thanTempItems.add(i1)
def thanOnClick(self, event, x, y, cc):
"Well, here is what should be done when mouse clicks."
dc = self.thanProj[2].thanCanvas
for i1 in self.__dragged:
dc.delete(i1)
dc.thanTempItems.remove(i1)
dc.thanLastResult = cc, None
dc.thanState = THAN_STATE_NONE
dc.thanOState = ThanStateGeneric(self.thanProj)
def thanZoomXyr(self, x, y, fact):
"Change internal coordinates according to zoom; this fuction should be in the state objects."
self.__x1 = x + (self.__x1-x)*fact
self.__y1 = y + (self.__y1-y)*fact
self.__r1 *= fact
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