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catenary_248.py
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catenary_248.py
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#!BPY
"""
Name: '_Catenary_248'
Blender: 2.48
Group: 'Misc'
Tooltip: 'shape of a perfectly flexible chain suspended by its ends and acted on by gravity'
"""
__author__ = "Alejandro Omar Chocano Vasquez"
__url__ = ("http://alexvaqp.googlepages.com")
__version__ = "1.0"
__bpydoc__ = """\
shape of a perfectly flexible chain
suspended by its ends and acted on by gravity
"""
# --------------------------------------------------------------------------
# Catenary by alexv
# --------------------------------------------------------------------------
# ***** BEGIN GPL LICENSE BLOCK *****
#
# 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.
#
# 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.
#
# ***** END GPL LICENCE BLOCK *****
# --------------------------------------------------------------------------
import Blender
from Blender import *
from math import * #sin,cos,pi,atan
from Blender.Draw import *
from Blender import Window
from Blender.BGL import *
#variables
#-----------------------------------------------------------------------------
class GLOBALES:
pass
glob=GLOBALES()
glob.STEPS=Create(24) #vertices in one turn
#first point
glob.X_A=Create(-5.000)
glob.Z_A=Create(1.000)
#second point
glob.X_B=Create(5.000)
glob.Z_B=Create(3.000)
glob.a=Create(2.000) #catenary parameter
glob.CurveType=Create(4) #Nurb or Poly Curve 0 Poly 4 Nurb
#make catenary
#-----------------------------------------------------------------------------
def catenary():
glob.SpiralNEW=Blender.Curve.New('Spiral')
glob.SpiralNEW.setFlag(1)
glob.SCENE = Scene.getCurrent()
glob.SpiralOB=Object.New('Curve')
glob.SpiralOB.link(glob.SpiralNEW)
glob.SCENE.link(glob.SpiralOB)
L=(glob.X_B.val-glob.X_A.val) #horizontal length
AZ=(glob.Z_B.val-glob.Z_A.val)*1 #vertical difference
x_v = (glob.X_A.val + (L/2 - AZ*glob.a.val/L))
z_v = (glob.Z_A.val - ((pow((L/2 - AZ*glob.a.val/L),2))/(2*glob.a.val))) * 1
AL = L/glob.STEPS.val #horizontal increase
i=0 #iteracion
while i<=glob.STEPS.val:
Ax = i * AL
x_i = glob.X_A.val + Ax
z_i = (z_v + (pow((x_i - x_v),2)/(2*glob.a.val)))*1
#y_i=y_a+P*cosh((x_i-x_vr)/P)
if i==0 :
glob.SpiralNEW.appendNurb([x_i,0,z_i,1,1]) #REVISAR PARA PUNTO INICIAL
glob.SpiralNEW[0].type=glob.CurveType.val
else:
glob.SpiralNEW.appendPoint(0,[x_i,0, z_i,1])
i+=1
glob.SpiralNEW[0].setFlagU(2)
glob.SpiralNEW[0].setFlagV(2)
glob.SpiralNEW.update()
Blender.Window.RedrawAll()
#-----------------------------------------------------------------------------
# Function clear window
#-----------------------------------------------------------------------------
def clear_window():
glColor3f(0.853,0.853,0.853)
glClear(GL_COLOR_BUFFER_BIT)
#-----------------------------------------------------------------------------
#menu
#-----------------------------------------------------------------------------
def menu():
clear_window()
glRasterPos2i(39,230)
Text('shape of a perfectly flexible')
glRasterPos2i(35,218)
Text('chain suspended by its ends')
glRasterPos2i(80,195)
Text('Catenary')
glRasterPos2i(15,190)
Text('_____________________________')
#TOP BOTTONS
#----------------------------------------------------------------------------------------------
curve_type = "Curve type%t|Nurb %x4|Poly %x0"
glob.CurveType= Menu(curve_type, 2, 30, 160, 50, 15, glob.CurveType.val, "Curve Type")
glob.STEPS=Number ("Vertices",2,110,160,90,16, glob.STEPS.val,3,100,"vertices in turn")
glRasterPos2i(30,140)
Text('introduce coordinates manually ')
glob.X_A=Number ("X_A ",1,30,120,80,16, glob.X_A.val,-100.00,100.00,"X in point A")
glob.Z_A=Number ("Z_A ",1,30,100,80,16, glob.Z_A.val,-100.00,100.00,"Z in point A")
glob.X_B=Number ("X_B ",1,120,120,80,16, glob.X_B.val,-100.00,100.00,"X in point B")
glob.Z_B=Number ("Z_B ",1,120,100,80,16, glob.Z_B.val,-100.00,100.00,"Z in point B")
glRasterPos2i(60,85)
Text('Catenary Parameter ')
glob.a=Slider ("",3,60,65,110,16, glob.a.val,0.001,100.000,1,"Catenary Parameter")
Button("EXIT",6,65,30,100,16,"Exit of script")
glRasterPos2i(15,20)
Text('_____________________________')
#----------------------------------------------------------------------------------------------
#-----------------------------------------------------------------------------
def event(evt,val):
if(evt==ESCKEY and not val):
Exit()
def bevent(event):
if event == 6:
Exit()
else :
glob.SCENE.unlink(glob.SpiralOB)
if glob.X_A.val == glob.X_B.val :
PupMenu("ERROR X_A must be different of X_B")
glob.X_A.val=-5
catenary()
def main():
catenary()
Register(menu,event, bevent)
main()

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