-
Notifications
You must be signed in to change notification settings - Fork 0
/
Draw.py
692 lines (525 loc) · 16.8 KB
/
Draw.py
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
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
"""
Draw.py
The Draw module defines functions that allow the user to create a
drawing. A drawing appears on the canvas. The canvas appears
in the window.
This module has been recoded by AJB to remove references to
pygame, and solely uses tkinter.
Original version is from Sedgwick, Princeton University
"""
import time
import os
import sys
import string
import tkinter
from tkinter import font
#-----------------------------------------------------------------------
# create a custom color
def color(r, g, b):
return '#%02x%02x%02x' % (r, g, b)
# Handy pre-defined colors
WHITE = '#ffffff'
BLACK = '#000000'
GRAY = '#888888'
RED = '#ff0000'
GREEN = '#00ff00'
BLUE = '#0000ff'
CYAN = '#00ffff'
MAGENTA = '#ff00ff'
YELLOW = '#ffff00'
DARK_RED = '#800000'
DARK_GREEN = '#008000'
DARK_BLUE = '#000080'
DARK_GRAY = '#404040'
LIGHT_GRAY = '#C0C0C0'
ORANGE = '#ffc800'
VIOLET = '#ee82ee'
PINK = '#ffafaf'
# Default Sizes and Values
_DEFAULT_CANVAS_SIZE = 512
_DEFAULT_PEN_COLOR = BLACK
_DEFAULT_FONT_FAMILY = 'Helvetica'
_DEFAULT_FONT_SIZE = 12
_DEFAULT_FONT_WEIGHT = 'normal'
_DEFAULT_FONT_SLANT = 'roman'
_validFontFamilies = None
_fontFamily = _DEFAULT_FONT_FAMILY
_fontSize = _DEFAULT_FONT_SIZE
_fontWeight = _DEFAULT_FONT_WEIGHT
_fontSlant = _DEFAULT_FONT_SLANT
_canvasWidth = float(_DEFAULT_CANVAS_SIZE)
_canvasHeight = float(_DEFAULT_CANVAS_SIZE)
_penColor = _DEFAULT_PEN_COLOR
_canvas = None
_tkWindow = None
_images = []
_imageRefs = []
# Has the window been created?
_windowCreated = False
# Do we want to update the display only upon calling show() ?
_showMode = False
# the queue (really a list) of keys that have been typed, awaiting processing
_keysTyped = []
# the queue of mouse clicks. Each element in the queue consists of
# a tuple containing x, y, "left" or "right"
_clicks = []
# The position of the mouse as of the most recent mouse click
_mousePos = None
# True if the mouse has moved since the last time we checked
_mouseMoved = False
def _on_closing():
global _tkWindow
_tkWindow.destroy()
def setCanvasSize(w=_DEFAULT_CANVAS_SIZE, h=_DEFAULT_CANVAS_SIZE):
"""
Set the size of the canvas to w pixels wide and h pixels high.
Calling this function is optional. If you call it, you must do
so before calling any drawing function.
"""
global _background
# global _surface
global _tkWindow
global _canvas
global _canvasWidth
global _canvasHeight
global _windowCreated
global _validFontFamilies
if _windowCreated:
raise Exception('The Draw window already was created')
if (w < 1) or (h < 1):
raise Exception('width and height must be positive')
_canvasWidth = w
_canvasHeight = h
_tkWindow = tkinter.Tk()
_tkWindow.title("Draw")
_tkWindow.protocol("WM_DELETE_WINDOW", _on_closing)
_canvas = tkinter.Canvas(_tkWindow, width=w, height=h,
bd=0, highlightthickness=0)
_canvas.pack()
_canvas.config(bg=WHITE)
#print("Doing the bindings")
_canvas.bind("<Button-1>", _leftButtonCallback)
_canvas.bind("<Button-2>", _rightButtonCallback)
_canvas.bind("<Button-3>", _rightButtonCallback)
_tkWindow.bind("<Motion>", _motionCallback)
#print("Done with the bindings")
_canvas.bind_all("<Key>", _keyCallback)
_validFontFamilies = list(tkinter.font.families())
_windowCreated = True
_tkWindow.update()
def setBackground(c=WHITE):
global _canvas
_makeSureWindowCreated()
_canvas.config(bg=c)
def setColor(c=_DEFAULT_PEN_COLOR):
"""
Set the pen color to c
c defaults to BLACK.
"""
global _penColor
_makeSureWindowCreated()
_penColor = c
def setFontFamily(f=_DEFAULT_FONT_FAMILY):
"""
Set the font family to f (e.g. 'Helvetica' or 'Courier' or 'Times').
"""
global _fontFamily
global _validFontFamilies
_makeSureWindowCreated()
_fontFamily = f
if not (f in _validFontFamilies):
errStr = "Invalid font " + f + ", not one of " + str(_validFontFamilies)
raise Exception(errStr)
def availableFonts():
_makeSureWindowCreated()
return _validFontFamilies
def setFontSize(s=_DEFAULT_FONT_SIZE):
"""
Set the font size to s (e.g. 12 or 16).
"""
global _fontSize
_fontSize = s
def setFontBold(b = None):
"""
Set the bolding as desired. The default weight is no bolding.
"""
global _fontWeight
if not b:
_fontWeight = _DEFAULT_FONT_WEIGHT
else:
_fontWeight = 'bold'
def setFontItalic(i = None):
"""
Set the italic as desired. The default italic is none.
"""
global _fontSlant
if not i:
_fontSlant = _DEFAULT_FONT_SLANT
else:
_fontSlant = 'italic'
#-----------------------------------------------------------------------
def _makeSureWindowCreated():
global _windowCreated
if not _windowCreated:
setCanvasSize()
_windowCreated = True
#-----------------------------------------------------------------------
# Functions to draw shapes, text, and images
def line(x0, y0, x1, y1):
"""
Draw a line from (x0, y0) to (x1, y1).
"""
global _canvas
global _penColor
_makeSureWindowCreated()
_canvas.create_line(x0, y0, x1, y1, capstyle=tkinter.ROUND, fill = _penColor)
_doUpdate()
def oval(x, y, width, height):
"""
Outline largest oval that fits in a box of size width x height
with top left at (x,y)
"""
global _canvas
global _penColor
_makeSureWindowCreated()
# it appears that the -1 is needed for x1 and y1 when drawing an outline,
# similar to when doing an outline of a rectangle. This was confirmed
# by magnified visual inspection of a rectangle and oval.
_canvas.create_oval(x, y, x+width-1, y+height-1, outline = _penColor)
_doUpdate()
def filledOval(x, y, width, height):
"""
Fill largest oval that fits in a box of size width x height
with top left at (x,y)
"""
global _canvas
global _penColor
_makeSureWindowCreated()
_canvas.create_oval(x, y, x+width, y+height, fill = _penColor, width=0)
_doUpdate()
def rect(x, y, width, height):
"""
Outline a rectangle of width and height whose upper left point is (x, y).
"""
global _canvas
global _penColor
_makeSureWindowCreated()
# Note that the -1 is needed, since the right and bottom
# borders actually are 1 pixel outside the bounding
# box of the rectangle
_canvas.create_rectangle(x, y, x+width-1, y+height-1,
outline = _penColor, width=1)
_doUpdate()
def filledRect(x, y, width, height):
"""
Fill a rectangle of width and height whose upper left point is (x, y).
"""
global _canvas
global _penColor
_makeSureWindowCreated()
_canvas.create_rectangle(x, y, x+width, y+height,
fill = _penColor, width=0)
_doUpdate()
def polygon(pts):
"""
Outline a polygon with x,y coordinates appearing in pts.
"""
global _canvas
global _penColor
_makeSureWindowCreated()
_canvas.create_polygon(pts, fill='', outline = _penColor, width = 1)
_doUpdate()
def filledPolygon(pts):
"""
Fill a polygon with x,y coordinates appearing in pts.
"""
global _canvas
global _penColor
_makeSureWindowCreated()
_canvas.create_polygon(pts, fill = _penColor, outline = _penColor)
_doUpdate()
def string(s, x, y):
"""
Draw string s at (x, y).
"""
global _tkWindow
global _canvas
global _penColor
global _fontFamily
global _fontSize
global _fontSlant
global _fontWeight
_makeSureWindowCreated()
style = _fontSlant + " " + _fontWeight
id = _canvas.create_text(x, y, text = s,
fill = _penColor,
anchor=tkinter.NW,
font=(_fontFamily, str(_fontSize), style)
)
_doUpdate()
return _canvas.bbox(id)
# return the length of the longest substring of s that will
# render within a width of w pixels
def __largestStringThatFits(s, w):
ans = len(s)
while ans > 0:
box = string(s[:ans], 0, -1000)
if box[2] < w: return ans
pos = s[:ans].rfind(' ')
if pos < 0:
return ans
ans = pos
return ans
# render the string s starting in a box whose upper
# left corner is at x,y and whose maximum width is w pixels
# The optional parameter spacing indicates how many pixels
# to skip for each additional line
def wrappedString(s, x, y, w, spacing = 0):
curY = y
while s != "":
wide = __largestStringThatFits(s, w)
box = string(s[:wide], x, curY)
curY = (spacing + box[3])
s = s[wide:].strip()
# return a PhotoImage object associated with the file "name".
# Caches the last 50 images loaded.
# If we need to implement loading a photoImage of a tile from an
# image file, see http://tkinter.unpythonic.net/wiki/PhotoImage.
# To support this, we would specify file names like this, which would
# uniquely identify the exact tile associated with that name:
# "foo.gif|x0|y0|wide|high"
# The code at that URL says to do:
#
#def subimage(src, l, t, r, b):
# dst = PhotoImage()
# dst.tk.call(dst, 'copy', src, '-from', l, t, r, b, '-to', 0, 0)
# return dst
# alternately, could write a helper function that you give it an image
# file name, and it returns to you a 2D list of colors, using the material
# at http://mgltools.scripps.edu/api/DejaVu/Tkinter.PhotoImage-class.html
def _getPhotoImage(name):
global _images
for p in _images:
if p[0] == name:
return p[1]
if len(_images) > 50:
_images.pop(0)
ans = tkinter.PhotoImage(file = name)
_images.append([name, ans])
return ans
# keeps up to 50 photo images alive at any given time.
# We need to do this since when the image is rendered later,
# the local variable will have gone out of scope.
# See https://tkinter.unpythonic.net/wiki/PhotoImage -
# "Disappearing Photoimage"
def _getPhotoImageReference(w, h):
global _imageRefs
# We're only going to cache 50 of these at any given time
if len(_imageRefs) >= 50: _imageRefs.pop(0)
# Create the photoimage and store a reference to keep it from being gc'ed
ans = tkinter.PhotoImage(width=w, height=h)
_imageRefs.append(ans)
return ans
# The mag parameter only applies to images specified via a 2d array
def picture(pic, x=0, y=0, mag=1):
"""
Draw pic placing the upper left corner at (x,y). pic is the
name of a .gif, .pgm, or .ppm format image.
"""
global _canvas
_makeSureWindowCreated()
# picture was specified by a file name
if type(pic) is str:
im = _getPhotoImage(pic)
# picture is, presumably, a 2D grid of colors
else:
numRows = len(pic)
numCols = len(pic[0])
im = _getPhotoImageReference(numCols*mag, numRows*mag)
line = ""
if mag == 1:
for row in range(numRows):
line += '{' + ' '.join(pic[row]) + '} '
else:
for row in range(numRows):
magRow = [pic[row][j//mag] for j in range(numCols * mag)]
theLine = '{' + ' '.join(magRow) + '} '
for dup in range(mag):
line += theLine
im.put(line)
_canvas.create_image((x, y), image = im, anchor = tkinter.NW, state='normal')
_doUpdate()
def clear():
"""
Clear the canvas to the background color
"""
global _canvas
_makeSureWindowCreated()
_canvas.delete(tkinter.ALL)
_doUpdate()
#-----------------------------------------------------------------------
def _doUpdate(inShow = False):
global _showMode
# if we're in showMode, then only update if inShow is True
# otherwise, update always
if (not _showMode) or inShow:
_tkWindow.update()
#_tkWindow.update_idletasks()
def show(msec=0):
"""
Force an update of the display, and then wait the specified number
of milliseconds.
"""
global _tkWindow
global _canvas
global _showMode
_makeSureWindowCreated()
_showMode = True
_doUpdate(True)
if msec > 0: _canvas.after(int(msec))
def _leftButtonCallback(event):
"""
Check if a left mouse button event has occurred
"""
global _clicks
_makeSureWindowCreated()
_clicks = [(event.x, event.y, "left")] + _clicks
def _rightButtonCallback(event):
"""
Check if a right mouse button event has occurred
"""
global _clicks
_makeSureWindowCreated()
_clicks = [(event.x, event.y, "right")] + _clicks
def _motionCallback(event):
"""
Check if a mouse motion event has occurred
EXPERIMENTAL!
"""
global _mouseMoved
_mouseMoved = True
def mouseMoved():
global _mouseMoved
answer = _mouseMoved
_mouseMoved = False
_doUpdate(True)
return answer
def currentMouse():
# root = tkinter.Tk()
global _canvas
_makeSureWindowCreated()
x = _canvas.winfo_pointerx() - _canvas.winfo_rootx()
y = _canvas.winfo_pointery() - _canvas.winfo_rooty()
return x,y
def _keyCallback(event):
"""
Check if a key has been typed, and if so, put that key in a queue.
"""
global _surface
global _keysTyped
_makeSureWindowCreated()
_keysTyped = [event.keysym] + _keysTyped
# Functions for retrieving keys
def hasNextKeyTyped():
"""
Return True if the queue of keys the user typed is not empty.
Otherwise return False.
"""
global _keysTyped
_doUpdate(True) # AJB
return _keysTyped != []
def nextKeyTyped():
"""
Remove the first key from the queue of keys that the the user typed,
and return that key.
"""
global _keysTyped
return _keysTyped.pop()
# Functions for dealing with mouse clicks
def mousePressed():
"""
Returns True if a mouse click is available in the queue, False otherwise
"""
global _clicks
global _mousePos
_mousePos = None
if _clicks != []:
_mousePos = _clicks.pop()
_doUpdate(True)
return _mousePos != None
def mouseX():
"""
Return the x coordinate in user space of the location at
which the mouse was most recently left-clicked. If a left-click
hasn't happened yet, raise an exception, since mouseX() shouldn't
be called until mousePressed() returns True.
"""
global _mousePos
if _mousePos:
return _mousePos[0]
raise Exception(
"Can't determine mouse position if a click hasn't happened")
def mouseY():
"""
Return the y coordinate in user space of the location at
which the mouse was most recently left-clicked. If a left-click
hasn't happened yet, raise an exception, since mouseY() shouldn't
be called until mousePressed() returns True.
"""
global _mousePos
if _mousePos:
return _mousePos[1]
raise Exception(
"Can't determine mouse position if a click hasn't happened")
def mouseLeft():
"""
Return True if the most recent mouse click was a left button click
"""
global _mousePos
if _mousePos:
return _mousePos[2] == "left"
raise Exception(
"Can't determine mouse button if click hasn't happened")
def mouseRight():
"""
Return True if the most recent mouse click was a right button click
"""
global _mousePos
if _mousePos:
return _mousePos[2] == "right"
raise Exception(
"Can't determine mouse button if click hasn't happened")
def _regressionTest():
"""
Perform regression testing.
"""
clear()
setBackground(YELLOW)
# Test handling of mouse and keyboard events.
setColor(BLACK)
print('Left click with the mouse or type a key')
while True:
if mousePressed():
filledOval(mouseX()-20, mouseY()-20, 40, 40)
if hasNextKeyTyped():
print(nextKeyTyped())
show(0)
# Never get here.
show()
#-----------------------------------------------------------------------
def _main():
"""
Dispatch to a function that does regression testing, or to a
dialog-box-handling function.
"""
import sys
if len(sys.argv) == 1:
_regressionTest()
elif sys.argv[1] == 'getFileName':
_getFileName()
elif sys.argv[1] == 'confirmFileSave':
_confirmFileSave()
elif sys.argv[1] == 'reportFileSaveError':
_reportFileSaveError(sys.argv[2])
if __name__ == '__main__':
_main()