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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
#!/usr/bin/env python
"""
PolyEditor: a simple app for editing polygons
Used as a demo for FloatCanvas
"""
import numpy as np
import random
import numpy.random as RandomArray
from wx.lib.floatcanvas import NavCanvas, FloatCanvas
# import a local copy:
#import sys
#sys.path.append("..")
#from floatcanvas import NavCanvas, FloatCanvas
import wx
class DrawFrame(wx.Frame):
"""
A frame used for the FloatCanvas Demo
"""
def __init__(self,parent, id,title,position,size):
wx.Frame.__init__(self,parent, id,title,position, size)
## Set up the MenuBar
MenuBar = wx.MenuBar()
FileMenu = wx.Menu()
exit = FileMenu.Append(wx.ID_EXIT, "", "Close Application")
self.Bind(wx.EVT_MENU, self.OnQuit, exit)
MenuBar.Append(FileMenu, "&File")
view_menu = wx.Menu()
zfit = view_menu.Append(wx.ID_ANY, "Zoom to &Fit", "Zoom to fit the window")
self.Bind(wx.EVT_MENU, self.ZoomToFit, zfit)
MenuBar.Append(view_menu, "&View")
help_menu = wx.Menu()
about = help_menu.Append(wx.ID_ABOUT, "",
"More information About this program")
self.Bind(wx.EVT_MENU, self.OnAbout, about)
MenuBar.Append(help_menu, "&Help")
self.SetMenuBar(MenuBar)
self.CreateStatusBar()
# Add the Canvas
self.Canvas = NavCanvas.NavCanvas(self,-1,(500,500),
Debug = 0,
BackgroundColor = "DARK SLATE BLUE"
).Canvas
self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
self.Canvas.Bind(FloatCanvas.EVT_MOTION, self.OnMove)
self.Canvas.Bind(FloatCanvas.EVT_LEFT_UP, self.OnLeftUp)
self.Canvas.Bind(FloatCanvas.EVT_LEFT_DOWN, self.OnLeftClick)
self.ResetSelections()
return None
def ResetSelections(self):
self.SelectedPoly = None
self.SelectedPolyOrig = None
self.SelectedPoints = None
self.PointSelected = False
self.SelectedPointNeighbors = None
def OnAbout(self, event):
dlg = wx.MessageDialog(self, "This is a small program to demonstrate\n"
"the use of the FloatCanvas\n",
"About Me", wx.OK | wx.ICON_INFORMATION)
dlg.ShowModal()
dlg.Destroy()
def ZoomToFit(self,event):
self.Canvas.ZoomToBB()
def Clear(self,event = None):
self.Canvas.ClearAll()
self.Canvas.SetProjectionFun(None)
self.Canvas.Draw()
def OnQuit(self,event):
self.Close(True)
def OnCloseWindow(self, event):
self.Destroy()
def OnMove(self, event):
"""
Updates the status bar with the world coordinates
And moves a point if there is one selected
"""
self.SetStatusText("%.2f, %.2f"%tuple(event.Coords))
if self.PointSelected:
PolyPoints = self.SelectedPoly.Points
Index = self.SelectedPoints.Index
dc = wx.ClientDC(self.Canvas)
PixelCoords = event.GetPosition()
dc.SetPen(wx.Pen('WHITE', 2, wx.SHORT_DASH))
dc.SetLogicalFunction(wx.XOR)
if self.SelectedPointNeighbors is None:
self.SelectedPointNeighbors = np.zeros((3,2), np.float64)
#fixme: This feels very inelegant!
if Index == 0:
self.SelectedPointNeighbors[0] = self.SelectedPoly.Points[-1]
self.SelectedPointNeighbors[1:3] = self.SelectedPoly.Points[:2]
elif Index == len(self.SelectedPoly.Points)-1:
self.SelectedPointNeighbors[0:2] = self.SelectedPoly.Points[-2:]
self.SelectedPointNeighbors[2] = self.SelectedPoly.Points[0]
else:
self.SelectedPointNeighbors = self.SelectedPoly.Points[Index-1:Index+2]
self.SelectedPointNeighbors = self.Canvas.WorldToPixel(self.SelectedPointNeighbors)
else:
dc.DrawLines(self.SelectedPointNeighbors)
self.SelectedPointNeighbors[1] = PixelCoords
dc.DrawLines(self.SelectedPointNeighbors)
def OnLeftUp(self, event):
## if a point was selected, it's not anymore
if self.PointSelected:
self.SelectedPoly.Points[self.SelectedPoints.Index] = event.GetCoords()
self.SelectedPoly.SetPoints(self.SelectedPoly.Points, copy = False)
self.SelectedPoints.SetPoints(self.SelectedPoly.Points, copy = False)
self.PointSelected = False
self.SelectedPointNeighbors = None
self.Canvas.Draw()
def OnLeftClick(self,event):
## If a click happens outside the polygon, it's no longer selected
self.DeSelectPoly()
self.Canvas.Draw()
def Setup(self, event = None):
"Setting up with some random polygons"
wx.GetApp().Yield()
self.ResetSelections()
self.Canvas.ClearAll()
Range = (-10,10)
# Create a couple of random Polygons
for i, color in enumerate(("Light Blue", "Green", "Purple","Yellow")):
points = RandomArray.uniform(Range[0],Range[1],(6,2))
Poly = self.Canvas.AddPolygon(points,
LineWidth = 2,
LineColor = "Black",
FillColor = color,
FillStyle = 'Solid')
Poly.Bind(FloatCanvas.EVT_FC_LEFT_DOWN, self.SelectPoly)
self.Canvas.ZoomToBB()
def SelectPoly(self, Object):
Canvas = self.Canvas
if Object is self.SelectedPolyOrig:
pass
else:
if self.SelectedPoly:
self.DeSelectPoly()
self.SelectedPolyOrig = Object
self.SelectedPoly = Canvas.AddPolygon(Object.Points,
LineWidth = 2,
LineColor = "Red",
FillColor = "Red",
FillStyle = "CrossHatch",
InForeground = True)
# Draw points on the Vertices of the Selected Poly:
self.SelectedPoints = Canvas.AddPointSet(Object.Points,
Diameter = 6,
Color = "Red",
InForeground = True)
self.SelectedPoints.Bind(FloatCanvas.EVT_FC_LEFT_DOWN, self.SelectPointHit)
Canvas.Draw()
def DeSelectPoly(self):
Canvas = self.Canvas
if self.SelectedPolyOrig is not None:
self.SelectedPolyOrig.SetPoints(self.SelectedPoly.Points, copy = False)
self.Canvas.Draw(Force = True)
Canvas.RemoveObject(self.SelectedPoly)
Canvas.RemoveObject(self.SelectedPoints)
self.ResetSelections()
def SelectPointHit(self, PointSet):
PointSet.Index = PointSet.FindClosestPoint(PointSet.HitCoords)
print("point #%i hit"%PointSet.Index)
#Index = PointSet.Index
self.PointSelected = True
class PolyEditor(wx.App):
"""
A simple example of making editable shapes with FloatCanvas
"""
def OnInit(self):
frame = DrawFrame(None,
-1,
"FloatCanvas Demo App",
wx.DefaultPosition,
(700,700),
)
self.SetTopWindow(frame)
frame.Show()
frame.Setup()
return True
PolyEditor().MainLoop()
|
