summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/asymptote/GUI/xasyBezierEditor.py
blob: 75ddeafa2d271d196acac4d6429596f63db0fbc3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
#!/usr/bin/env python
###########################################################################
#
# xasyBezierEditor implements the ability to graphically edit the location
# of the nodes and control points of a bezier curve.
#
#
# Author: Orest Shardt
# Created: June 29, 2007
#
###########################################################################

import math
import sys
from CubicBezier import *
import xasy2asy

if sys.version_info >= (3, 0):
  from tkinter import *
else:
  from Tkinter import *

class node:
  def __init__(self,precontrol,node,postcontrol,uid,isTied = True):
    self.node = node
    self.precontrol = precontrol
    self.postcontrol = postcontrol
    self.isTied = isTied
    self.uid = uid
    self.nodeID = self.precontrolID = self.prelineID = self.postcontrolID = self.postlineID = None

  def shiftNode(self,delta):
    self.node = (self.node[0]+delta[0],self.node[1]+delta[1])
    if self.precontrol != None:
      self.precontrol = (self.precontrol[0]+delta[0],self.precontrol[1]+delta[1])
    if self.postcontrol != None:
      self.postcontrol = (self.postcontrol[0]+delta[0],self.postcontrol[1]+delta[1])

  def shiftPrecontrol(self,delta):
    self.precontrol = (self.precontrol[0]+delta[0],self.precontrol[1]+delta[1])
    if self.isTied and self.postcontrol != None:
      self.rotatePostControl(self.precontrol)

  def shiftPostcontrol(self,delta):
    self.postcontrol = (self.postcontrol[0]+delta[0],self.postcontrol[1]+delta[1])
    if self.isTied and self.precontrol != None:
      self.rotatePrecontrol(self.postcontrol)

  def rotatePrecontrol(self,after):
    vx,vy = after[0]-self.node[0],after[1]-self.node[1]
    l = norm((vx,vy))
    if l == 0:
      return
    m = norm((self.precontrol[0]-self.node[0],self.precontrol[1]-self.node[1]))
    vx = -m*vx/l
    vy = -m*vy/l
    self.precontrol = self.node[0]+vx,self.node[1]+vy

  def rotatePostControl(self,after):
    vx,vy = after[0]-self.node[0],after[1]-self.node[1]
    l = norm((vx,vy))
    if l == 0:
      return
    m = norm((self.postcontrol[0]-self.node[0],self.postcontrol[1]-self.node[1]))
    vx = -m*vx/l
    vy = -m*vy/l
    self.postcontrol = self.node[0]+vx,self.node[1]+vy

  def draw(self,canvas):
    width = 3
    if self.precontrol != None:
      if self.prelineID == None:
        self.prelineID = canvas.create_line(self.precontrol[0],-self.precontrol[1],self.node[0],-self.node[1],tags=("preline",self.uid))
      else:
        canvas.coords(self.prelineID,self.precontrol[0],-self.precontrol[1],self.node[0],-self.node[1])
      if self.precontrolID == None:
        self.precontrolID = canvas.create_oval(self.precontrol[0]-width,-self.precontrol[1]-width,self.precontrol[0]+width,-self.precontrol[1]+width,
            fill="red",outline="black",tags=("precontrol",self.uid))
      else:
        canvas.coords(self.precontrolID,self.precontrol[0]-width,-self.precontrol[1]-width,self.precontrol[0]+width,-self.precontrol[1]+width)
    if self.postcontrol != None:
      if self.postlineID == None:
        self.postlineID = canvas.create_line(self.postcontrol[0],-self.postcontrol[1],self.node[0],-self.node[1],tags=("postline",self.uid))
      else:
        canvas.coords(self.postlineID,self.postcontrol[0],-self.postcontrol[1],self.node[0],-self.node[1])
      if self.postcontrolID == None:
        self.postcontrolID = canvas.create_oval(self.postcontrol[0]-width,-self.postcontrol[1]-width,self.postcontrol[0]+width,-self.postcontrol[1]+width,
            fill="red",outline="black",tags=("postcontrol",self.uid))
      else:
        canvas.coords(self.postcontrolID,self.postcontrol[0]-width,-self.postcontrol[1]-width,self.postcontrol[0]+width,-self.postcontrol[1]+width)
    if self.isTied:
      color = "blue"
    else:
      color = "green"
    if self.nodeID == None:
      self.nodeID = canvas.create_oval(self.node[0]-width,-self.node[1]-width,self.node[0]+width,-self.node[1]+width,
          fill=color,outline="black",tags=("node",self.uid))
    else:
      canvas.coords(self.nodeID,self.node[0]-width,-self.node[1]-width,self.node[0]+width,-self.node[1]+width)
      canvas.itemconfigure(self.nodeID,fill=color)

class xasyBezierEditor:
  def __init__(self,parent,shape,canvas):
    self.parent = parent
    self.shape = shape
    self.transform = self.shape.transform[0]
    self.path = self.shape.path
    self.canvas = canvas
    self.modified = False
    self.path.computeControls()
    isCyclic = self.path.nodeSet[-1] == 'cycle'
    segments = len(self.path.controlSet)
    self.nodeList = []
    for i in range(segments):
      if i == 0:
        node0 = self.transform*self.path.nodeSet[i]
        control = self.transform*self.path.controlSet[i][0]
        self.nodeList.append(node(None,node0,control,len(self.nodeList)))
      else:
        node0 = self.transform*self.path.nodeSet[i]
        precontrol = self.transform*self.path.controlSet[i-1][1]
        postcontrol = self.transform*self.path.controlSet[i][0]
        self.nodeList.append(node(precontrol,node0,postcontrol,len(self.nodeList)))
    if not isCyclic:
      node0 = self.transform*self.path.nodeSet[-1]
      precontrol = self.transform*self.path.controlSet[-1][1]
      self.nodeList.append(node(precontrol,node0,None,len(self.nodeList)))
    else:
      self.nodeList[0].precontrol = self.transform*self.path.controlSet[-1][1]
    self.showControls()
    self.bindNodeEvents()
    self.bindControlEvents()

  def showControls(self):
    for n in self.nodeList:
      n.draw(self.canvas)
    self.bindNodeEvents()
    self.bindControlEvents()
    self.parent.updateCanvasSize()

  def bindNodeEvents(self):
    self.canvas.tag_bind("node","<B1-Motion>",self.nodeDrag)
    self.canvas.tag_bind("node","<Button-1>",self.buttonDown)
    self.canvas.tag_bind("node","<Double-Button-1>",self.toggleNode)

  def unbindNodeEvents(self):
    self.canvas.tag_unbind("node","<B1-Motion>")
    self.canvas.tag_unbind("node","<Button-1>")
    self.canvas.tag_unbind("node","<Double-Button-1>")

  def bindControlEvents(self):
    self.canvas.tag_bind("precontrol || postcontrol","<B1-Motion>",self.controlDrag)
    self.canvas.tag_bind("precontrol || postcontrol","<Button-1>",self.buttonDown)

  def unbindControlEvents(self):
    self.canvas.tag_unbind("precontrol || postcontrol","<B1-Motion>")
    self.canvas.tag_unbind("precontrol || postcontrol","<Button-1>")

  def buttonDown(self,event):
    self.parent.freeMouseDown = False
    self.startx,self.starty = event.x,event.y

  def toggleNode(self,event):
    self.parent.freeMouseDown = False
    tags = self.canvas.gettags(CURRENT)
    obj = tags[0]
    uid = int(tags[1])
    self.nodeList[uid].isTied = not self.nodeList[uid].isTied
    self.showControls()

  def nodeDrag(self,event):
    self.parent.freeMouseDown = False
    deltax = event.x-self.startx
    deltay = event.y-self.starty
    tags = self.canvas.gettags(CURRENT)
    obj = tags[0]
    uid = int(tags[1])
    self.nodeList[uid].shiftNode((deltax,-deltay))
    self.startx,self.starty = event.x,event.y
    self.applyChanges()
    self.showControls()
    self.shape.drawOnCanvas(self.canvas,self.parent.magnification)

  def controlDrag(self,event):
    self.parent.freeMouseDown = False
    deltax = event.x-self.startx
    deltay = event.y-self.starty
    tags = self.canvas.gettags(CURRENT)
    obj = tags[0]
    uid = int(tags[1])
    if obj == "precontrol":
      self.nodeList[uid].shiftPrecontrol((deltax,-deltay))
    elif obj == "postcontrol":
      self.nodeList[uid].shiftPostcontrol((deltax,-deltay))
    self.startx,self.starty = event.x,event.y
    self.applyChanges()
    self.showControls()
    self.shape.drawOnCanvas(self.canvas,self.parent.magnification)

  def applyChanges(self):
    self.modified = True
    self.shape.transform[0] = xasy2asy.asyTransform((0,0,1,0,0,1))
    for i in range(len(self.nodeList)):
      self.path.nodeSet[i] = self.nodeList[i].node
      if self.nodeList[i].postcontrol != None:
        self.path.controlSet[i][0] = self.nodeList[i].postcontrol
      if self.nodeList[i].precontrol != None:
        self.path.controlSet[i-1][1] = self.nodeList[i].precontrol

  def endEdit(self):
    self.unbindNodeEvents()
    self.unbindControlEvents()
    self.canvas.delete("node || precontrol || postcontrol || preline || postline")