ScatterPlotItem.py 24.8 KB
Newer Older
1
2
3
4
from pyqtgraph.Qt import QtGui, QtCore
from pyqtgraph.Point import Point
import pyqtgraph.functions as fn
from GraphicsObject import GraphicsObject
5
6
import numpy as np
import scipy.stats
7
8

__all__ = ['ScatterPlotItem', 'SpotItem']
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32


## Build all symbol paths
Symbols = {name: QtGui.QPainterPath() for name in ['o', 's', 't', 'd', '+']}

Symbols['o'].addEllipse(QtCore.QRectF(-0.5, -0.5, 1, 1))
Symbols['s'].addRect(QtCore.QRectF(-0.5, -0.5, 1, 1))
coords = {
    't': [(-0.5, -0.5), (0, 0.5), (0.5, -0.5)],
    'd': [(0., -0.5), (-0.4, 0.), (0, 0.5), (0.4, 0)],
    '+': [
        (-0.5, -0.05), (-0.5, 0.05), (-0.05, 0.05), (-0.05, 0.5),
        (0.05, 0.5), (0.05, 0.05), (0.5, 0.05), (0.5, -0.05), 
        (0.05, -0.05), (0.05, -0.5), (-0.05, -0.5), (-0.05, -0.05)
    ],
}
for k, c in coords.iteritems():
    Symbols[k].moveTo(*c[0])
    for x,y in c[1:]:
        Symbols[k].lineTo(x, y)
    Symbols[k].closeSubpath()



33
class ScatterPlotItem(GraphicsObject):
34
35
36
37
    """
    Displays a set of x/y points. Instances of this class are created
    automatically as part of PlotDataItem; these rarely need to be instantiated
    directly.
38
    
39
40
41
42
43
44
45
46
47
48
49
50
    The size, shape, pen, and fill brush may be set for each point individually 
    or for all points. 
    
    
    ========================  ===============================================
    **Signals:**
    sigPlotChanged(self)      Emitted when the data being plotted has changed
    sigClicked(self, points)  Emitted when the curve is clicked. Sends a list
                              of all the points under the mouse pointer.
    ========================  ===============================================
    
    """
51
52
53
54
    #sigPointClicked = QtCore.Signal(object, object)
    sigClicked = QtCore.Signal(object, object)  ## self, points
    sigPlotChanged = QtCore.Signal(object)
    
55
56
57
58
59
60
61
62
    def __init__(self, *args, **kargs):
        """
        Accepts the same arguments as setData()
        """
        
        GraphicsObject.__init__(self)
        self.data = None
        self.spots = []
63
        #self.fragments = None
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
        self.bounds = [None, None]
        self.opts = {}
        self.spotsValid = False
        self._spotPixmap = None
        
        self.setPen(200,200,200)
        self.setBrush(100,100,150)
        self.setSymbol('o')
        self.setSize(7)
        self.setPxMode(True)
        self.setIdentical(False)
        
        self.setData(*args, **kargs)
        
        
    def setData(self, *args, **kargs):
80
        """
81
82
83
84
85
        **Ordered Arguments:**
        
        * If there is only one unnamed argument, it will be interpreted like the 'spots' argument.
        * If there are two unnamed arguments, they will be interpreted as sequences of x and y values.
        
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
        **Keyword Arguments:**
        *spots*                Optional list of dicts. Each dict specifies parameters for a single spot:
                               {'pos': (x,y), 'size', 'pen', 'brush', 'symbol'}. This is just an alternate method
                               of passing in data for the corresponding arguments.
        *x*,*y*                1D arrays of x,y values.
        *pos*                  2D structure of x,y pairs (such as Nx2 array or list of tuples)
        *pxMode*               If True, spots are always the same size regardless of scaling, and size is given in px.
                               Otherwise, size is in scene coordinates and the spots scale with the view.
                               Default is True
        *identical*            If True, all spots are forced to look identical. 
                               This can result in performance enhancement.
                               Default is False
        *symbol*               can be one (or a list) of:
                               
                               * 'o'  circle (default)
                               * 's'  square
                               * 't'  triangle
                               * 'd'  diamond
                               * '+'  plus
        *pen*                  The pen (or list of pens) to use for drawing spot outlines.
        *brush*                The brush (or list of brushes) to use for filling spots.
        *size*                 The size (or list of sizes) of spots. If *pxMode* is True, this value is in pixels. Otherwise,
                               it is in the item's local coordinate system.
        *data*                 a list of python objects used to uniquely identify each spot.
111
        ====================== ===============================================================================================
112
113
        """
        
114
115
        self.clear()

116
        
117
118
119
120
121
122
123
124
        ## deal with non-keyword arguments
        if len(args) == 1:
            kargs['spots'] = args[0]
        elif len(args) == 2:
            kargs['x'] = args[0]
            kargs['y'] = args[1]
        elif len(args) > 2:
            raise Exception('Only accepts up to two non-keyword arguments.')
125
        
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
        ## convert 'pos' argument to 'x' and 'y'
        if 'pos' in kargs:
            pos = kargs['pos']
            if isinstance(pos, np.ndarray):
                kargs['x'] = pos[:,0]
                kargs['y'] = pos[:,1]
            else:
                x = []
                y = []
                for p in pos:
                    if isinstance(p, QtCore.QPointF):
                        x.append(p.x())
                        y.append(p.y())
                    else:
                        x.append(p[0])
                        y.append(p[1])
                kargs['x'] = x
                kargs['y'] = y
144
        
145
146
147
148
149
        ## determine how many spots we have
        if 'spots' in kargs:
            numPts = len(kargs['spots'])
        elif 'y' in kargs and kargs['y'] is not None:
            numPts = len(kargs['y'])
150
        else:
151
152
153
            kargs['x'] = []
            kargs['y'] = []
            numPts = 0
154
        
155
        ## create empty record array
156
        self.data = np.empty(numPts, dtype=[('x', float), ('y', float), ('size', float), ('symbol', 'S1'), ('pen', object), ('brush', object), ('spot', object)])
157
158
159
160
        self.data['size'] = -1  ## indicates use default size
        self.data['symbol'] = ''
        self.data['pen'] = None
        self.data['brush'] = None
161
162
        self.pointData = np.empty(numPts, dtype=object)
        self.pointData[:] = None
163
        
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
        if 'spots' in kargs:
            spots = kargs['spots']
            for i in xrange(len(spots)):
                spot = spots[i]
                for k in spot:
                    if k == 'pen':
                        self.data[i][k] = fn.mkPen(spot[k])
                    elif k == 'brush':
                        self.data[i][k] = fn.mkBrush(spot[k])
                    elif k == 'pos':
                        pos = spot[k]
                        if isinstance(pos, QtCore.QPointF):
                            x,y = pos.x(), pos.y()
                        else:
                            x,y = pos[0], pos[1]
                        self.data[i]['x'] = x
                        self.data[i]['y'] = y
181
                    elif k in ['x', 'y', 'size', 'symbol']:
182
                        self.data[i][k] = spot[k]
183
184
                    elif k == 'data':
                        self.pointData[i] = spot[k]
185
186
187
188
189
190
191
192
193
194
195
196
                    else:
                        raise Exception("Unknown spot parameter: %s" % k)
        elif 'y' in kargs:
            self.data['x'] = kargs['x']
            self.data['y'] = kargs['y']
        
        
        ## Set any extra parameters provided in keyword arguments
        for k in ['pxMode', 'identical', 'pen', 'brush', 'symbol', 'size']:
            if k in kargs:
                setMethod = getattr(self, 'set' + k[0].upper() + k[1:])
                setMethod(kargs[k])
197
                
198
        if 'data' in kargs:
199
            self.setPointData(kargs['data'])
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
        self.updateSpots()
        
        
        
        
        
        
        
        
        #pen = kargs.get('pen', (200,200,200))
        #brush = kargs.get('pen', (100,100,150))
        
        #if hasattr(pen, '__len__'):
            #pen = map(pg.mkPen(pen))
        #self.data['pen'] = pen
        
        #if hasattr(pen, '__len__'):
            #brush = map(pg.mkPen(pen))
        #self.data['brush'] = pen
        
        #self.data['size'] = kargs.get('size', 7)
        #self.data['symbol'] = kargs.get('symbol', 'o')
        
        
        
        #if spots is not None and len(spots) > 0:
            #spot = spots[0]
            #for k in spot:
                #self.data[k] = []
            #for spot in spots:
                #for k,v in spot.iteritems():
                    #self.data[k].append(v)
        
    def setPoints(self, *args, **kargs):
235
        ##Deprecated; use setData
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
        return self.setData(*args, **kargs)
        
    #def setPoints(self, spots=None, x=None, y=None, data=None):
        #"""
        #Remove all existing points in the scatter plot and add a new set.
        #Arguments:
            #spots - list of dicts specifying parameters for each spot
                    #[ {'pos': (x,y), 'pen': 'r', ...}, ...]
            #x, y -  arrays specifying location of spots to add. 
                    #all other parameters (pen, symbol, etc.) will be set to the default
                    #values for this scatter plot.
                    #these arguments are IGNORED if 'spots' is specified
            #data -  list of arbitrary objects to be assigned to spot.data for each spot
                    #(this is useful for identifying spots that are clicked on)
        #"""
        #self.clear()
        #self.bounds = [[0,0],[0,0]]
        #self.addPoints(spots, x, y, data)
        
255
256
257
258
259
260
    def implements(self, interface=None):
        ints = ['plotData']
        if interface is None:
            return ints
        return interface in ints
    
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
    def setPen(self, *args, **kargs):
        if len(args) == 1 and (isinstance(args[0], np.ndarray) or isinstance(args[0], list)):
            pens = args[0]
            if self.data is None:
                raise Exception("Must set data before setting multiple pens.")
            if len(pens) != len(self.data):
                raise Exception("Number of pens does not match number of points (%d != %d)" % (len(pens), len(self.data)))
            for i in xrange(len(pens)):
                self.data[i]['pen'] = fn.mkPen(pens[i])
        else:
            self.opts['pen'] = fn.mkPen(*args, **kargs)
        self.updateSpots()
        
    def setBrush(self, *args, **kargs):
        if len(args) == 1 and (isinstance(args[0], np.ndarray) or isinstance(args[0], list)):
            brushes = args[0]
            if self.data is None:
                raise Exception("Must set data before setting multiple brushes.")
            if len(brushes) != len(self.data):
                raise Exception("Number of brushes does not match number of points (%d != %d)" % (len(brushes), len(self.data)))
            for i in xrange(len(brushes)):
                self.data[i]['brush'] = fn.mkBrush(brushes[i], **kargs)
        else:
            self.opts['brush'] = fn.mkBrush(*args, **kargs)
        self.updateSpots()

    def setSymbol(self, symbol):
        if isinstance(symbol, np.ndarray) or isinstance(symbol, list):
            symbols = symbol
            if self.data is None:
                raise Exception("Must set data before setting multiple symbols.")
            if len(symbols) != len(self.data):
                raise Exception("Number of symbols does not match number of points (%d != %d)" % (len(symbols), len(self.data)))
            self.data['symbol'] = symbols
        else:
            self.opts['symbol'] = symbol
        self.updateSpots()
        
    def setSize(self, size):
        if isinstance(size, np.ndarray) or isinstance(size, list):
            sizes = size
            if self.data is None:
                raise Exception("Must set data before setting multiple sizes.")
            if len(sizes) != len(self.data):
                raise Exception("Number of sizes does not match number of points (%d != %d)" % (len(sizes), len(self.data)))
            self.data['size'] = sizes
        else:
            self.opts['size'] = size
        self.updateSpots()
        
311
312
313
314
315
316
    def setPointData(self, data):
        if isinstance(data, np.ndarray) or isinstance(data, list):
            if self.data is None:
                raise Exception("Must set xy data before setting meta data.")
            if len(data) != len(self.data):
                raise Exception("Length of meta data does not match number of points (%d != %d)" % (len(data), len(self.data)))
317
        self.pointData = data
318
319
320
        self.updateSpots()
        
        
321
322
323
324
    def setIdentical(self, ident):
        self.opts['identical'] = ident
        self.updateSpots()
        
325
    def setPxMode(self, mode):
326
327
328
329
330
331
332
        self.opts['pxMode'] = mode
        self.updateSpots()
        
    def updateSpots(self):
        self.spotsValid = False
        self.update()
        
333
334
335
336
337
338
339
    def clear(self):
        for i in self.spots:
            i.setParentItem(None)
            s = i.scene()
            if s is not None:
                s.removeItem(i)
        self.spots = []
340
341
342
        self.data = None
        self.spotsValid = False
        self.bounds = [None, None]
343
344
        

345
    def dataBounds(self, ax, frac=1.0, orthoRange=None):
346
347
        if frac >= 1.0 and self.bounds[ax] is not None:
            return self.bounds[ax]
348
        
349
350
351
352
353
        if self.data is None or len(self.data) == 0:
            return (None, None)
        
        if ax == 0:
            d = self.data['x']
354
            d2 = self.data['y']
355
356
        elif ax == 1:
            d = self.data['y']
357
358
359
360
361
362
            d2 = self.data['x']
        
        if orthoRange is not None:
            mask = (d2 >= orthoRange[0]) * (d2 <= orthoRange[1])
            d = d[mask]
            d2 = d2[mask]
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
            
        if frac >= 1.0:
            minIndex = np.argmin(d)
            maxIndex = np.argmax(d)
            minVal = d[minIndex]
            maxVal = d[maxIndex]
            if not self.opts['pxMode']:
                minVal -= self.data[minIndex]['size']
                maxVal += self.data[maxIndex]['size']
            self.bounds[ax] = (minVal, maxVal)
            return self.bounds[ax]
        elif frac <= 0.0:
            raise Exception("Value for parameter 'frac' must be > 0. (got %s)" % str(frac))
        else:
            return (scipy.stats.scoreatpercentile(d, 50 - (frac * 50)), scipy.stats.scoreatpercentile(d, 50 + (frac * 50)))
            
            

    
    def addPoints(self, *args, **kargs):
383
        """
384
385
386
        Add new points to the scatter plot. 
        Arguments are the same as setData()
        Note: this is expensive; plenty of room for optimization here.
387
        """
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
        if self.data is None:
            self.setData(*args, **kargs)
            return
            
        
        data1 = self.data[:]
        #range1 = [self.bounds[0][:], self.bounds[1][:]]
        self.setData(*args, **kargs)
        newData = np.empty(len(self.data) + len(data1), dtype=self.data.dtype)
        newData[:len(data1)] = data1
        newData[len(data1):] = self.data
        #self.bounds = [
            #[min(self.bounds[0][0], range1[0][0]), max(self.bounds[0][1], range1[0][1])],
            #[min(self.bounds[1][0], range1[1][0]), max(self.bounds[1][1], range1[1][1])],
        #]
        self.data = newData
        self.sigPlotChanged.emit(self)
    
    
407
408
409
410
411
412
    def generateSpots(self, clear=True):
        if clear:
            for spot in self.spots:
                self.scene().removeItem(spot)
            self.spots = []
        
413
414
415
416
417
418
419
420
421
422
423
424
        #if self.opts['identical'] and self.opts['pxMode']:
            #pm = self.spotPixmap()
            #sr = QtCore.QRectF(0, 0, pm.width(), pm.height())
            #self.fragments = []
            #for i in range(len(self.data)):
                #self.fragments.append(QtGui.QPainter.PixmapFragment.create(QtCore.QPointF(self.data[i]['x'], self.data[i]['y']), sr))
            #self.spotsValid = True
            #self.sigPlotChanged.emit(self)
            #return
        #else:
            #self.fragments = None
            
425
426
        xmn = ymn = xmx = ymx = None
        
427
428
429
430
431
432
433
434
435
436
437
438
        ## apply defaults
        size = self.data['size'].copy()
        size[size<0] = self.opts['size']
        
        pen = self.data['pen'].copy()
        pen[pen<0] = self.opts['pen']  ## note pen<0 checks for pen==None
        
        brush = self.data['brush'].copy()
        brush[brush<0] = self.opts['brush']
        
        symbol = self.data['symbol'].copy()
        symbol[symbol==''] = self.opts['symbol']
439

440
441
442
443
444
        
        for i in xrange(len(self.data)):
            s = self.data[i]
            pos = Point(s['x'], s['y'])
            if self.opts['pxMode']:
445
446
                psize = 0
            else:
447
448
                psize = size[i]
                
449
            if self.pointData is None or self.pointData[i] is None:
Luke Campagnola's avatar
bugfix  
Luke Campagnola committed
450
                data = self.opts.get('data', None)
451
452
453
            else:
                data = self.pointData[i]
                
454
455
456
457
458
459
460
461
462
463
464
            #if xmn is None:
                #xmn = pos[0]-psize
                #xmx = pos[0]+psize
                #ymn = pos[1]-psize
                #ymx = pos[1]+psize
            #else:
                #xmn = min(xmn, pos[0]-psize)
                #xmx = max(xmx, pos[0]+psize)
                #ymn = min(ymn, pos[1]-psize)
                #ymx = max(ymx, pos[1]+psize)
                
465
            item = self.mkSpot(pos, size[i], self.opts['pxMode'], brush[i], pen[i], data, symbol=symbol[i], index=len(self.spots))
466
            self.spots.append(item)
467
            self.data[i]['spot'] = item
468
469
470
471
            #if self.optimize:
                #item.hide()
                #frag = QtGui.QPainter.PixmapFragment.create(pos, QtCore.QRectF(0, 0, size, size))
                #self.optimizeFragments.append(frag)
472
473
474
475
476
                
        #self.bounds = [[xmn, xmx], [ymn, ymx]]
        self.spotsValid = True
        self.sigPlotChanged.emit(self)
        
477
478
479
480
481
482
483
484
485
486
487
488
489
        
    #def setPointSize(self, size):
        #for s in self.spots:
            #s.size = size
        ##self.setPoints([{'size':s.size, 'pos':s.pos(), 'data':s.data} for s in self.spots])
        #self.setPoints()
                
    #def paint(self, p, *args):
        #if not self.optimize:
            #return
        ##p.setClipRegion(self.boundingRect())
        #p.drawPixmapFragments(self.optimizeFragments, self.optimizePixmap)

490
    def paint(self, p, *args):
491
492
        if not self.spotsValid:
            self.generateSpots()
493
494
495
        #if self.fragments is not None:
            #pm = self.spotPixmap()
            #p.drawPixmapFragments(self.fragments, pm)
496
497
498
499
500

    def spotPixmap(self):
        ## If all spots are identical, return the pixmap to use for all spots
        ## Otherwise return None
        
501
        if not self.opts['identical']:
502
503
            return None
        if self._spotPixmap is None:
504
            spot = SpotItem(size=self.opts['size'], pxMode=True, brush=self.opts['brush'], pen=self.opts['pen'], symbol=self.opts['symbol'])
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
            self._spotPixmap = spot.pixmap
        return self._spotPixmap

    def mkSpot(self, pos, size, pxMode, brush, pen, data, symbol=None, index=None):
        ## Make and return a SpotItem (or PixmapSpotItem if in pxMode)
        brush = fn.mkBrush(brush)
        pen = fn.mkPen(pen)
        if pxMode:
            img = self.spotPixmap()  ## returns None if not using identical mode
            #item = PixmapSpotItem(size, brush, pen, data, image=img, symbol=symbol, index=index)
            item = SpotItem(size, pxMode, brush, pen, data, symbol=symbol, image=img, index=index)
        else:
            item = SpotItem(size, pxMode, brush, pen, data, symbol=symbol, index=index)
        item.setParentItem(self)
        item.setPos(pos)
        #item.sigClicked.connect(self.pointClicked)
        return item
        
    def boundingRect(self):
524
525
526
527
528
529
530
531
        (xmn, xmx) = self.dataBounds(ax=0)
        (ymn, ymx) = self.dataBounds(ax=1)
        if xmn is None or xmx is None:
            xmn = 0
            xmx = 0
        if ymn is None or ymx is None:
            ymn = 0
            ymx = 0
532
        return QtCore.QRectF(xmn, ymn, xmx-xmn, ymx-ymn)
533
534
535
536
        
        #if xmn is None or xmx is None or ymn is None or ymx is None:
            #return QtCore.QRectF()
        #return QtCore.QRectF(xmn, ymn, xmx-xmn, ymx-ymn)
537
538
539
540
541
542
        #return QtCore.QRectF(xmn-1, ymn-1, xmx-xmn+2, ymx-ymn+2)
        
    #def pointClicked(self, point):
        #self.sigPointClicked.emit(self, point)

    def points(self):
543
544
        if not self.spotsValid:
            self.generateSpots()
545
546
547
        return self.spots[:]

    def pointsAt(self, pos):
548
549
        if not self.spotsValid:
            self.generateSpots()
550
551
552
553
554
555
556
557
558
559
560
        x = pos.x()
        y = pos.y()
        pw = self.pixelWidth()
        ph = self.pixelHeight()
        pts = []
        for s in self.spots:
            sp = s.pos()
            ss = s.size
            sx = sp.x()
            sy = sp.y()
            s2x = s2y = ss * 0.5
561
            if self.opts['pxMode']:
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
                s2x *= pw
                s2y *= ph
            if x > sx-s2x and x < sx+s2x and y > sy-s2y and y < sy+s2y:
                pts.append(s)
                #print "HIT:", x, y, sx, sy, s2x, s2y
            #else:
                #print "No hit:", (x, y), (sx, sy)
                #print "       ", (sx-s2x, sy-s2y), (sx+s2x, sy+s2y)
        pts.sort(lambda a,b: cmp(b.zValue(), a.zValue()))
        return pts
            

    #def mousePressEvent(self, ev):
        #QtGui.QGraphicsItem.mousePressEvent(self, ev)
        #if ev.button() == QtCore.Qt.LeftButton:
            #pts = self.pointsAt(ev.pos())
            #if len(pts) > 0:
                #self.mouseMoved = False
                #self.ptsClicked = pts
                #ev.accept()
            #else:
                ##print "no spots"
                #ev.ignore()
        #else:
            #ev.ignore()
        
    #def mouseMoveEvent(self, ev):
        #QtGui.QGraphicsItem.mouseMoveEvent(self, ev)
        #self.mouseMoved = True
        #pass
    
    #def mouseReleaseEvent(self, ev):
        #QtGui.QGraphicsItem.mouseReleaseEvent(self, ev)
        #if not self.mouseMoved:
            #self.sigClicked.emit(self, self.ptsClicked)

    def mouseClickEvent(self, ev):
        if ev.button() == QtCore.Qt.LeftButton:
            pts = self.pointsAt(ev.pos())
            if len(pts) > 0:
                self.ptsClicked = pts
                self.sigClicked.emit(self, self.ptsClicked)
                ev.accept()
            else:
                #print "no spots"
                ev.ignore()
        else:
            ev.ignore()



class SpotItem(GraphicsObject):
    #sigClicked = QtCore.Signal(object)
    
    def __init__(self, size, pxMode, brush, pen, data=None, symbol=None, image=None, index=None):
        GraphicsObject.__init__(self)
        self.pxMode = pxMode

620
621
622
623
624
        try:
            symbol = int(symbol)
        except: 
            pass
        
625
626
627
628
        if symbol is None:
            symbol = 'o'    ## circle by default
        elif isinstance(symbol, int):  ## allow symbols specified by integer for easy iteration
            symbol = ['o', 's', 't', 'd', '+'][symbol]
629
630
631
            
            
            
632
633
634
635
636
637
638
639
        ####print 'SpotItem symbol: ', symbol
        self.data = data
        self.pen = pen
        self.brush = brush
        self.size = size
        self.index = index
        self.symbol = symbol
        #s2 = size/2.
640
        self.path = Symbols[symbol]
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
        
        if pxMode:
            ## pre-render an image of the spot and display this rather than redrawing every time.
            if image is None:
                self.pixmap = self.makeSpotImage(size, pen, brush, symbol)
            else:
                self.pixmap = image ## image is already provided (probably shared with other spots)
            self.setFlags(self.flags() | self.ItemIgnoresTransformations | self.ItemHasNoContents)
            self.pi = QtGui.QGraphicsPixmapItem(self.pixmap, self)
            self.pi.setPos(-0.5*size, -0.5*size)
        else:
            self.scale(size, size)


    def makeSpotImage(self, size, pen, brush, symbol=None):
        self.spotImage = QtGui.QImage(size+2, size+2, QtGui.QImage.Format_ARGB32_Premultiplied)
        self.spotImage.fill(0)
        p = QtGui.QPainter(self.spotImage)
        p.setRenderHint(p.Antialiasing)
        p.translate(size*0.5+1, size*0.5+1)
        p.scale(size, size)
        self.paint(p, None, None)
        p.end()
        return QtGui.QPixmap(self.spotImage)


    def setBrush(self, brush):
        self.brush = fn.mkBrush(brush)
        self.update()
        
    def setPen(self, pen):
        self.pen = fn.mkPen(pen)
        self.update()
        
    def boundingRect(self):
        return self.path.boundingRect()
        
    def shape(self):
        return self.path
        
    def paint(self, p, *opts):
        p.setPen(self.pen)
        p.setBrush(self.brush)
        p.drawPath(self.path)