summaryrefslogtreecommitdiffstats
path: root/Lib/lib-tk/turtle.py
blob: 49375a7258bf170844bab4e791e047d18f884da2 (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
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
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
# LogoMation-like turtle graphics

from math import * # Also for export
import Tkinter
Tk = Tkinter
Error = Exception

class RawPen:

    def __init__(self, canvas):
        self._canvas = canvas
        self._items = []
        self._tracing = 1
        self.degrees()
        self.reset()

    def degrees(self, fullcircle=360.0):
        self._fullcircle = fullcircle
        self._invradian = pi / (fullcircle * 0.5)

    def radians(self):
        self.degrees(2.0*pi)

    def reset(self):
        canvas = self._canvas
        width = canvas.winfo_width()
        height = canvas.winfo_height()
        if width <= 1:
            width = canvas['width']
        if height <= 1:
            height = canvas['height']
        self._origin = float(width)/2.0, float(height)/2.0
        self._position = self._origin
        self._angle = 0.0
        self._drawing = 1
        self._width = 1
        self._color = "black"
        self._filling = 0
        self._path = []
        self._tofill = []
        self.clear()
        canvas._root().tkraise()

    def clear(self):
        self.fill(0)
        canvas = self._canvas
        items = self._items
        self._items = []
        for item in items:
            canvas.delete(item)

    def tracer(self, flag):
        self._tracing = flag

    def forward(self, distance):
        x0, y0 = start = self._position
        x1 = x0 + distance * cos(self._angle*self._invradian)
        y1 = y0 - distance * sin(self._angle*self._invradian)
        self._goto(x1, y1)

    def backward(self, distance):
        self.forward(-distance)

    def left(self, angle):
        self._angle = (self._angle + angle) % self._fullcircle

    def right(self, angle):
        self.left(-angle)

    def up(self):
        self._drawing = 0

    def down(self):
        self._drawing = 1

    def width(self, width):
        self._width = float(width)

    def color(self, *args):
        if not args:
            raise Error, "no color arguments"
        if len(args) == 1:
            color = args[0]
            if type(color) == type(""):
                # Test the color first
                try:
                    id = self._canvas.create_line(0, 0, 0, 0, fill=color)
                except Tk.TclError:
                    raise Error, "bad color string: %s" % `color`
                self._color = color
                return
            try:
                r, g, b = color
            except:
                raise Error, "bad color sequence: %s" % `color`
        else:
            try:
                r, g, b = args
            except:
                raise Error, "bad color arguments: %s" % `args`
        assert 0 <= r <= 1
        assert 0 <= g <= 1
        assert 0 <= b <= 1
        x = 255.0
        y = 0.5
        self._color = "#%02x%02x%02x" % (int(r*x+y), int(g*x+y), int(b*x+y))

    def write(self, arg, move=0):
        x, y = start = self._position
        x = x-1 # correction -- calibrated for Windows
        item = self._canvas.create_text(x, y, 
                                        text=str(arg), anchor="sw",
                                        fill=self._color)
        self._items.append(item)
        if move:
            x0, y0, x1, y1 = self._canvas.bbox(item)
            self._goto(x1, y1)

    def fill(self, flag):
        if self._filling:
            path = tuple(self._path)
            smooth = self._filling < 0
            if len(path) > 2:
                item = self._canvas._create('polygon', path,
                                            {'fill': self._color,
                                             'smooth': smooth})
                self._items.append(item)
                self._canvas.lower(item)
                if self._tofill:
                    for item in self._tofill:
                        self._canvas.itemconfigure(item, fill=self._color)
                        self._items.append(item)
        self._path = []
        self._tofill = []
        self._filling = flag
        if flag:
            self._path.append(self._position)

    def circle(self, radius, extent=None):
        if extent is None:
            extent = self._fullcircle
        x0, y0 = self._position
        xc = x0 - radius * sin(self._angle * self._invradian)
        yc = y0 - radius * cos(self._angle * self._invradian)
        if radius >= 0.0:
            start = self._angle - 90.0
        else:
            start = self._angle + 90.0
            extent = -extent
        if self._filling:
            if abs(extent) >= self._fullcircle:
                item = self._canvas.create_oval(xc-radius, yc-radius,
                                                xc+radius, yc+radius,
                                                width=self._width,
                                                outline="")
                self._tofill.append(item)
            item = self._canvas.create_arc(xc-radius, yc-radius,
                                           xc+radius, yc+radius,
                                           style="chord",
                                           start=start,
                                           extent=extent,
                                           width=self._width,
                                           outline="")
            self._tofill.append(item)
        if self._drawing:
            if abs(extent) >= self._fullcircle:
                item = self._canvas.create_oval(xc-radius, yc-radius,
                                                xc+radius, yc+radius,
                                                width=self._width,
                                                outline=self._color)
                self._items.append(item)
            item = self._canvas.create_arc(xc-radius, yc-radius,
                                           xc+radius, yc+radius,
                                           style="arc",
                                           start=start,
                                           extent=extent,
                                           width=self._width,
                                           outline=self._color)
            self._items.append(item)
        angle = start + extent
        x1 = xc + abs(radius) * cos(angle * self._invradian)
        y1 = yc - abs(radius) * sin(angle * self._invradian)
        self._angle = (self._angle + extent) % self._fullcircle
        self._position = x1, y1
        if self._filling:
            self._path.append(self._position)

    def goto(self, *args):
        if len(args) == 1:
            try:
                x, y = args[0]
            except:
                raise Error, "bad point argument: %s" % `args[0]`
        else:
            try:
                x, y = args
            except:
                raise Error, "bad coordinates: %s" % `args[0]`
        x0, y0 = self._origin
        self._goto(x0+x, y0-y)

    def _goto(self, x1, y1):
        x0, y0 = start = self._position
        self._position = map(float, (x1, y1))
        if self._filling:
            self._path.append(self._position)
        if self._drawing:
            if self._tracing:
                dx = float(x1 - x0)
                dy = float(y1 - y0)
                distance = hypot(dx, dy)
                nhops = int(distance)
                item = self._canvas.create_line(x0, y0, x0, y0,
                                                width=self._width,
                                                arrow="last",
                                                capstyle="round",
                                                fill=self._color)
                try:
                    for i in range(1, 1+nhops):
                        x, y = x0 + dx*i/nhops, y0 + dy*i/nhops
                        self._canvas.coords(item, x0, y0, x, y)
                        self._canvas.update()
                        self._canvas.after(10)
                    self._canvas.itemconfigure(item, arrow="none")
                except Tk.TclError:
                    # Probably the window was closed!
                    return
            else:
                item = self._canvas.create_line(x0, y0, x1, y1,
                                                width=self._width,
                                                capstyle="round",
                                                fill=self._color)
            self._items.append(item)


_root = None
_canvas = None
_pen = None

class Pen(RawPen):

    def __init__(self):
        global _root, _canvas
        if _root is None:
            _root = Tk.Tk()
            _root.wm_protocol("WM_DELETE_WINDOW", self._destroy)
        if _canvas is None:
            # XXX Should have scroll bars
            _canvas = Tk.Canvas(_root, background="white")
            _canvas.pack(expand=1, fill="both")
        RawPen.__init__(self, _canvas)

    def _destroy(self):
        global _root, _canvas, _pen
        root = self._canvas._root()
        if root is _root:
            _pen = None
            _root = None
            _canvas = None
        root.destroy()
        

def _getpen():
    global _pen
    pen = _pen
    if not pen:
        _pen = pen = Pen()
    return pen

def degrees(): _getpen().degrees()
def radians(): _getpen().radians()
def reset(): _getpen().reset()
def clear(): _getpen().clear()
def tracer(flag): _getpen().tracer(flag)
def forward(distance): _getpen().forward(distance)
def backward(distance): _getpen().backward(distance)
def left(angle): _getpen().left(angle)
def right(angle): _getpen().right(angle)
def up(): _getpen().up()
def down(): _getpen().down()
def width(width): _getpen().width(width)
def color(*args): apply(_getpen().color, args)
def write(arg, move=0): _getpen().write(arg, move)
def fill(flag): _getpen().fill(flag)
def circle(radius, extent=None): _getpen().circle(radius, extent)
def goto(*args): apply(_getpen().goto, args)

def demo():
    reset()
    tracer(1)
    up()
    backward(100)
    down()
    # draw 3 squares; the last filled
    width(3)
    for i in range(3):
        if i == 2:
            fill(1)
        for j in range(4):
            forward(20)
            left(90)
        if i == 2:
            color("maroon")
            fill(0)
        up()
        forward(30)
        down()
    width(1)
    color("black")
    # move out of the way
    tracer(0)
    up()
    right(90)
    forward(100)
    right(90)
    forward(100)
    right(180)
    down()
    # some text
    write("startstart", 1)
    write("start", 1)
    color("red")
    # staircase
    for i in range(5):
        forward(20)
        left(90)
        forward(20)
        right(90)
    # filled staircase
    fill(1)
    for i in range(5):
        forward(20)
        left(90)
        forward(20)
        right(90)
    fill(0)
    # more text
    write("end")
    if __name__ == '__main__':
        _root.mainloop()

if __name__ == '__main__':
    demo()