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#############################################################################
#
# Author: Sophie Coon, Michel F. SANNER, Kevin CHAN
#
# Copyright: M. Sanner TSRI 2000
#
#############################################################################
#
# $Header: /opt/cvs/python/packages/share1.5/ViewerFramework/drawShape.py,v 1.2.10.1 2016/02/12 00:29:31 annao Exp $
#
# $Id: drawShape.py,v 1.2.10.1 2016/02/12 00:29:31 annao Exp $
#
import Tkinter
import numpy
from DejaVu.IndexedPolygons import IndexedPolygons
class DrawShape:
""" gui to allow user to draw an arbitrary shape and get points and normals
for the shape. """
def __init__(self, master, grid=10):
self.root = Tkinter.Toplevel(master)
# add a title
self.title = Tkinter.Label(self.root,text='Draw a Shape')
description = 'click left mouse button to set a point\n click right mouse button to stop drawing\n draw points clockwise'
self.details = Tkinter.Label(self.root, text=description)
self.title.pack(side='top', anchor='n')
self.details.pack(side='bottom')
self.f = Tkinter.Frame(self.root)
self.c = Tkinter.Canvas(self.f, borderwidth = 3, relief='ridge')
self.c.grid(column=4, rowspan=5)
Tkinter.Widget.bind(self.c, "<Button-1>", self.mouseDown)
Tkinter.Widget.bind(self.c, "<Button-3>", self.endShape)
Tkinter.Widget.bind(self.c, "<Motion>", self.mouseMotion)
self.hasFirstPoint = 0
self.but=Tkinter.Button(self.f, text='clear',command=self.clear)
self.but.grid(row=4, column=2)
self.dup = Tkinter.IntVar()
smooth = Tkinter.Radiobutton(self.f, text = 'smooth edges',
var = self.dup, value = 0)
sharp = Tkinter.Radiobutton(self.f, text = 'sharp edges',
var = self.dup, value = 1)
smooth.grid(row=0, columnspan=3)
sharp.grid(row=1, columnspan=3)
self.cap1 = Tkinter.IntVar()
self.cap2 = Tkinter.IntVar()
cap1 = Tkinter.Checkbutton(self.f, text = 'front cap', var = self.cap1)
cap2 = Tkinter.Checkbutton(self.f, text = 'end cap', var = self.cap2)
cap1.grid(row=2, columnspan=3)
cap2.grid(row=3, columnspan=3)
# list of points in contour
self.shape = []
self.end = 0
# this is a "tagOrId" for the line we draw on the canvas
self.rubberbandLine = None
# this is the size of the gridding squares
self.griddingSize = grid
# how much 1 grid space is in real world
self.gridToWorld = 0.1
# build the OK Cancel buttons
ok = Tkinter.Button(self.f, text='OK', command=self.OK_cb)
cancel = Tkinter.Button(self.f, text='Cancel', command=self.Cancel_cb)
cancel.grid(row=4, column=1)
ok.grid(row=4, column=0)
self.f.pack(side='bottom', anchor='s')
def mouseDown(self, event):
# canvas x and y take the screen coords from the event and translate
# them into the coordinate system of the canvas object
x = self.c.canvasx(event.x, self.griddingSize)
y = self.c.canvasy(event.y, self.griddingSize)
if len(self.shape)>0: # after first point
self.newline=self.c.create_line(self.shape[-1][0],
self.shape[-1][1],
x, y, tags='segment')
self.shape.append((x,y))
if self.rubberbandLine:
self.c.delete(self.rubberbandLine)
self.rubberbandLine = self.c.create_line(x, y, x, y, tags='rubber')
def endShape(self, event):
self.end = 1
if self.rubberbandLine:
self.c.delete(self.rubberbandLine)
def mouseMotion(self, event):
# canvas x and y take the screen coords from the event and translate
# them into the coordinate system of the canvas object
if len(self.shape)==0: return
if self.end: return
x = self.c.canvasx(event.x, self.griddingSize)
y = self.c.canvasy(event.y, self.griddingSize)
if (self.shape[-1][0] != event.x) and (self.shape[-1][1] != event.y):
self.c.delete(self.rubberbandLine)
self.rubberbandLine = self.c.create_line(
self.shape[-1][0], self.shape[-1][1], x, y)
# this flushes the output, making sure that
# the rectangle makes it to the screen
# before the next event is handled
self.f.update_idletasks()
def End(self):
import math
# center the points around the origin
sca = (1.0/self.griddingSize)*self.gridToWorld
points = numpy.array(self.shape, 'f')* sca
xsum, ysum = 0, 0
if points:
repeat = 0
comp = points[-1]-points[0]
if abs(comp[0])<.01 and abs(comp[1])<.01: repeat = -1
for i in range(len(points)+repeat):
xsum = xsum + points[i][0]
ysum = ysum + points[i][1]
xcenter = xsum/(len(points)+repeat)
ycenter = ysum/(len(points)+repeat)
origin = (xcenter, ycenter)
points = points - origin
points[:,1:] = points[:,1:]*-1
# 3D
o = numpy.ones((len(points), 1))
points = numpy.concatenate((points, o), 1)
# calculate normals to each side
normals = numpy.zeros((len(points)-1, 3), 'f')
for i in range(len(points)-1):
diff = points[i+1] - points[i]
if diff[1]==0:
normals[i][0] = 0.0
normals[i][1] = diff[0]/abs(diff[0])
else:
slope = -diff[0]/diff[1]
size = -math.sqrt(1+slope**2)*(diff[1]/abs(diff[1]))
normals[i][0] = 1.0/size
normals[i][1] = slope/size
# duplicate vertices
if self.dup.get():
pts = numpy.concatenate((points, points), 1)
self.points = numpy.reshape(pts, (2*len(points), 3))
norms1 = numpy.concatenate((numpy.reshape(normals[-1],
(1,3)),
normals))
norms2 = numpy.concatenate((normals,
numpy.reshape(normals[0],
(1,3))))
norms = numpy.concatenate((norms1, norms2), 1)
self.normals = numpy.reshape(norms, (2*len(points), 3))
# single vertices: average normals
else:
self.points = points
self.normals = numpy.zeros((len(points), 3)).astype('f')
for i in range(len(points)-1):
n = (normals[i-1]+normals[i])/2
self.normals[i] = n.astype('f')
self.normals[len(points)-1] = self.normals[0]
print self.points
else: self.points, self.normals = [], []
#now use points to make a polyline or polygon or whatever
def OK_cb(self, event=None):
"""call back for OK button"""
if not hasattr(self, 'points'): self.End()
if self.points: self.root.quit()
def Cancel_cb(self):
"""call back for Cancel button"""
self.points = []
self.normals = []
self.root.quit()
def clear(self):
self.shape=[]
self.end = 0
self.pointindex=0
self.c.delete(self.c.gettags('segment'))
def go(self):
"""start chooser in modal mode"""
self.root.grab_set()
self.root.mainloop()
self.root.destroy()
return self.points, self.normals, self.dup.get(), self.cap1.get(),\
self.cap2.get()
if __name__ =='__main__':
import pdb
root=Tkinter.Tk()
myDraw=DrawShape(root)
val = myDraw.go()
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