30 1 Python Programming 101
197 widthEntry.pack()
198 widthSize.set(str(1))
199
200 radiusLabel = tkinter.Label(sideBar,text="Radius")
201 radiusLabel.pack()
202 radiusSize = tkinter.StringVar()
203 radiusEntry = tkinter.Entry(sideBar,textvariable=radiusSize)
204 radiusSize.set(str(10))
205 radiusEntry.pack()
206
207 # A button widget calls an event handler when it is pressed. The circleHandler
208 # function below is the event handler when the Draw Circle button is pressed.
209 def circleHandler():
210 # When drawing, a command is created and then the command is drawn by calling
211 # the draw method. Adding the command to the graphicsCommands sequence means the
212 # application will remember the picture.
213 cmd = CircleCommand(float(radiusSize.get()), float(widthSize.get()), penColor.get())
214 cmd.draw(theTurtle)
215 self.graphicsCommands.append(cmd)
216
217 # These two lines are needed to update the screen and to put the focus back
218 # in the drawing canvas. This is necessary because when pressing "u" to undo,
219 # the screen must have focus to receive the key press.
220 screen.update()
221 screen.listen()
222
223 # This creates the button widget in the sideBar. The fill=tkinter.BOTH causes the button
224 # to expand to fill the entire width of the sideBar.
225 circleButton = tkinter.Button(sideBar, text = "Draw Circle", command=circleHandler)
226 circleButton.pack(fill=tkinter.BOTH)
227
228 # The color mode 255 below allows colors to be specified in RGB form (i.e. Red/
229 # Green/Blue). The mode allows the Red value to be set by a two digit hexadecimal
230 # number ranging from 00-FF. The same applies for Blue and Green values. The
231 # color choosers below return a string representing the selected color and a slice
232 # is taken to extract the #RRGGBB hexadecimal string that the color choosers return.
233 screen.colormode(255)
234 penLabel = tkinter.Label(sideBar,text="Pen Color")
235 penLabel.pack()
236 penColor = tkinter.StringVar()
237 penEntry = tkinter.Entry(sideBar,textvariable=penColor)
238 penEntry.pack()
239 # This is the color black.
240 penColor.set("#000000")
241
242 def getPenColor():
243 color = tkinter.colorchooser.askcolor()
244 if color != None:
245 penColor.set(str(color)[-9:-2])
246
247 penColorButton = tkinter.Button(sideBar, text = "Pick Pen Color", command=getPenColor)
248 penColorButton.pack(fill=tkinter.BOTH)
249
250 fillLabel = tkinter.Label(sideBar,text="Fill Color")
251 fillLabel.pack()
252 fillColor = tkinter.StringVar()
253 fillEntry = tkinter.Entry(sideBar,textvariable=fillColor)
254 fillEntry.pack()
255 fillColor.set("#000000")
256
257 def getFillColor():
258 color = tkinter.colorchooser.askcolor()
259 if color != None:
260 fillColor.set(str(color)[-9:-2])
261
262 fillColorButton = \
263 tkinter.Button(sideBar, text = "Pick Fill Color", command=getFillColor)
264 fillColorButton.pack(fill=tkinter.BOTH)
265
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