Source code for pyqtgraph.graphicsItems.ScatterPlotItem

from itertools import starmap, repeat
try:
    from itertools import imap
except ImportError:
    imap = map
import numpy as np
import weakref
from ..Qt import QtGui, QtCore, USE_PYSIDE, USE_PYQT5
from ..Point import Point
from .. import functions as fn
from .GraphicsItem import GraphicsItem
from .GraphicsObject import GraphicsObject
from .. import getConfigOption
from ..pgcollections import OrderedDict
from .. import debug
from ..python2_3 import basestring

__all__ = ['ScatterPlotItem', 'SpotItem']


## Build all symbol paths
Symbols = OrderedDict([(name, QtGui.QPainterPath()) for name in ['o', 's', 't', 't1', 't2', 't3','d', '+', 'x', 'p', 'h', 'star']])
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)],
    't1': [(-0.5, 0.5), (0, -0.5), (0.5, 0.5)],
    't2': [(-0.5, -0.5), (-0.5, 0.5), (0.5, 0)],
    't3': [(0.5, 0.5), (0.5, -0.5), (-0.5, 0)],
    '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)
    ],
    'p': [(0, -0.5), (-0.4755, -0.1545), (-0.2939, 0.4045),
          (0.2939, 0.4045), (0.4755, -0.1545)],
    'h': [(0.433, 0.25), (0., 0.5), (-0.433, 0.25), (-0.433, -0.25),
          (0, -0.5), (0.433, -0.25)],
    'star': [(0, -0.5), (-0.1123, -0.1545), (-0.4755, -0.1545),
             (-0.1816, 0.059), (-0.2939, 0.4045), (0, 0.1910),
             (0.2939, 0.4045), (0.1816, 0.059), (0.4755, -0.1545),
             (0.1123, -0.1545)]
}
for k, c in coords.items():
    Symbols[k].moveTo(*c[0])
    for x,y in c[1:]:
        Symbols[k].lineTo(x, y)
    Symbols[k].closeSubpath()
tr = QtGui.QTransform()
tr.rotate(45)
Symbols['x'] = tr.map(Symbols['+'])


def drawSymbol(painter, symbol, size, pen, brush):
    if symbol is None:
        return
    painter.scale(size, size)
    painter.setPen(pen)
    painter.setBrush(brush)
    if isinstance(symbol, basestring):
        symbol = Symbols[symbol]
    if np.isscalar(symbol):
        symbol = list(Symbols.values())[symbol % len(Symbols)]
    painter.drawPath(symbol)


def renderSymbol(symbol, size, pen, brush, device=None):
    """
    Render a symbol specification to QImage.
    Symbol may be either a QPainterPath or one of the keys in the Symbols dict.
    If *device* is None, a new QPixmap will be returned. Otherwise,
    the symbol will be rendered into the device specified (See QPainter documentation
    for more information).
    """
    ## Render a spot with the given parameters to a pixmap
    penPxWidth = max(np.ceil(pen.widthF()), 1)
    if device is None:
        device = QtGui.QImage(int(size+penPxWidth), int(size+penPxWidth), QtGui.QImage.Format_ARGB32)
        device.fill(0)
    p = QtGui.QPainter(device)
    try:
        p.setRenderHint(p.Antialiasing)
        p.translate(device.width()*0.5, device.height()*0.5)
        drawSymbol(p, symbol, size, pen, brush)
    finally:
        p.end()
    return device

def makeSymbolPixmap(size, pen, brush, symbol):
    ## deprecated
    img = renderSymbol(symbol, size, pen, brush)
    return QtGui.QPixmap(img)

class SymbolAtlas(object):
    """
    Used to efficiently construct a single QPixmap containing all rendered symbols
    for a ScatterPlotItem. This is required for fragment rendering.

    Use example:
        atlas = SymbolAtlas()
        sc1 = atlas.getSymbolCoords('o', 5, QPen(..), QBrush(..))
        sc2 = atlas.getSymbolCoords('t', 10, QPen(..), QBrush(..))
        pm = atlas.getAtlas()

    """
    def __init__(self):
        # symbol key : QRect(...) coordinates where symbol can be found in atlas.
        # note that the coordinate list will always be the same list object as
        # long as the symbol is in the atlas, but the coordinates may
        # change if the atlas is rebuilt.
        # weak value; if all external refs to this list disappear,
        # the symbol will be forgotten.
        self.symbolMap = weakref.WeakValueDictionary()

        self.atlasData = None # numpy array of atlas image
        self.atlas = None     # atlas as QPixmap
        self.atlasValid = False
        self.max_width=0

    def getSymbolCoords(self, opts):
        """
        Given a list of spot records, return an object representing the coordinates of that symbol within the atlas
        """
        sourceRect = np.empty(len(opts), dtype=object)
        keyi = None
        sourceRecti = None
        for i, rec in enumerate(opts):
            key = (rec[3], rec[2], id(rec[4]), id(rec[5]))   # TODO: use string indexes?
            if key == keyi:
                sourceRect[i] = sourceRecti
            else:
                try:
                    sourceRect[i] = self.symbolMap[key]
                except KeyError:
                    newRectSrc = QtCore.QRectF()
                    newRectSrc.pen = rec['pen']
                    newRectSrc.brush = rec['brush']
                    self.symbolMap[key] = newRectSrc
                    self.atlasValid = False
                    sourceRect[i] = newRectSrc
                    keyi = key
                    sourceRecti = newRectSrc
        return sourceRect

    def buildAtlas(self):
        # get rendered array for all symbols, keep track of avg/max width
        rendered = {}
        avgWidth = 0.0
        maxWidth = 0
        images = []
        for key, sourceRect in self.symbolMap.items():
            if sourceRect.width() == 0:
                img = renderSymbol(key[0], key[1], sourceRect.pen, sourceRect.brush)
                images.append(img)  ## we only need this to prevent the images being garbage collected immediately
                arr = fn.imageToArray(img, copy=False, transpose=False)
            else:
                (y,x,h,w) = sourceRect.getRect()
                arr = self.atlasData[int(x):int(x+w), int(y):int(y+w)]
            rendered[key] = arr
            w = arr.shape[0]
            avgWidth += w
            maxWidth = max(maxWidth, w)

        nSymbols = len(rendered)
        if nSymbols > 0:
            avgWidth /= nSymbols
            width = max(maxWidth, avgWidth * (nSymbols**0.5))
        else:
            avgWidth = 0
            width = 0

        # sort symbols by height
        symbols = sorted(rendered.keys(), key=lambda x: rendered[x].shape[1], reverse=True)

        self.atlasRows = []

        x = width
        y = 0
        rowheight = 0
        for key in symbols:
            arr = rendered[key]
            w,h = arr.shape[:2]
            if x+w > width:
                y += rowheight
                x = 0
                rowheight = h
                self.atlasRows.append([y, rowheight, 0])
            self.symbolMap[key].setRect(y, x, h, w)
            x += w
            self.atlasRows[-1][2] = x
        height = y + rowheight

        self.atlasData = np.zeros((int(width), int(height), 4), dtype=np.ubyte)
        for key in symbols:
            y, x, h, w = self.symbolMap[key].getRect()
            self.atlasData[int(x):int(x+w), int(y):int(y+h)] = rendered[key]
        self.atlas = None
        self.atlasValid = True
        self.max_width = maxWidth

    def getAtlas(self):
        if not self.atlasValid:
            self.buildAtlas()
        if self.atlas is None:
            if len(self.atlasData) == 0:
                return QtGui.QPixmap(0,0)
            img = fn.makeQImage(self.atlasData, copy=False, transpose=False)
            self.atlas = QtGui.QPixmap(img)
        return self.atlas




[docs]class ScatterPlotItem(GraphicsObject): """ 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. 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. ======================== =============================================== """ #sigPointClicked = QtCore.Signal(object, object) sigClicked = QtCore.Signal(object, object) ## self, points sigPlotChanged = QtCore.Signal(object)
[docs] def __init__(self, *args, **kargs): """ Accepts the same arguments as setData() """ profiler = debug.Profiler() GraphicsObject.__init__(self) self.picture = None # QPicture used for rendering when pxmode==False self.fragmentAtlas = SymbolAtlas() self.data = np.empty(0, dtype=[('x', float), ('y', float), ('size', float), ('symbol', object), ('pen', object), ('brush', object), ('data', object), ('item', object), ('sourceRect', object), ('targetRect', object), ('width', float)]) self.bounds = [None, None] ## caches data bounds self._maxSpotWidth = 0 ## maximum size of the scale-variant portion of all spots self._maxSpotPxWidth = 0 ## maximum size of the scale-invariant portion of all spots self.opts = { 'pxMode': True, 'useCache': True, ## If useCache is False, symbols are re-drawn on every paint. 'antialias': getConfigOption('antialias'), 'name': None, } self.setPen(fn.mkPen(getConfigOption('foreground')), update=False) self.setBrush(fn.mkBrush(100,100,150), update=False) self.setSymbol('o', update=False) self.setSize(7, update=False) profiler() self.setData(*args, **kargs) profiler('setData')
#self.setCacheMode(self.DeviceCoordinateCache)
[docs] def setData(self, *args, **kargs): """ **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. ====================== =============================================================================================== **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 *symbol* can be one (or a list) of: * 'o' circle (default) * 's' square * 't' triangle * 'd' diamond * '+' plus * any QPainterPath to specify custom symbol shapes. To properly obey the position and size, custom symbols should be centered at (0,0) and width and height of 1.0. Note that it is also possible to 'install' custom shapes by setting ScatterPlotItem.Symbols[key] = shape. *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. *identical* *Deprecated*. This functionality is handled automatically now. *antialias* Whether to draw symbols with antialiasing. Note that if pxMode is True, symbols are always rendered with antialiasing (since the rendered symbols can be cached, this incurs very little performance cost) *name* The name of this item. Names are used for automatically generating LegendItem entries and by some exporters. ====================== =============================================================================================== """ oldData = self.data ## this causes cached pixmaps to be preserved while new data is registered. self.clear() ## clear out all old data self.addPoints(*args, **kargs)
[docs] def addPoints(self, *args, **kargs): """ Add new points to the scatter plot. Arguments are the same as setData() """ ## 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.') ## 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 ## 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']) else: kargs['x'] = [] kargs['y'] = [] numPts = 0 ## Extend record array oldData = self.data self.data = np.empty(len(oldData)+numPts, dtype=self.data.dtype) ## note that np.empty initializes object fields to None and string fields to '' self.data[:len(oldData)] = oldData #for i in range(len(oldData)): #oldData[i]['item']._data = self.data[i] ## Make sure items have proper reference to new array newData = self.data[len(oldData):] newData['size'] = -1 ## indicates to use default size if 'spots' in kargs: spots = kargs['spots'] for i in range(len(spots)): spot = spots[i] for k in spot: if k == 'pos': pos = spot[k] if isinstance(pos, QtCore.QPointF): x,y = pos.x(), pos.y() else: x,y = pos[0], pos[1] newData[i]['x'] = x newData[i]['y'] = y elif k == 'pen': newData[i][k] = fn.mkPen(spot[k]) elif k == 'brush': newData[i][k] = fn.mkBrush(spot[k]) elif k in ['x', 'y', 'size', 'symbol', 'brush', 'data']: newData[i][k] = spot[k] else: raise Exception("Unknown spot parameter: %s" % k) elif 'y' in kargs: newData['x'] = kargs['x'] newData['y'] = kargs['y'] if 'pxMode' in kargs: self.setPxMode(kargs['pxMode']) if 'antialias' in kargs: self.opts['antialias'] = kargs['antialias'] ## Set any extra parameters provided in keyword arguments for k in ['pen', 'brush', 'symbol', 'size']: if k in kargs: setMethod = getattr(self, 'set' + k[0].upper() + k[1:]) setMethod(kargs[k], update=False, dataSet=newData, mask=kargs.get('mask', None)) if 'data' in kargs: self.setPointData(kargs['data'], dataSet=newData) self.prepareGeometryChange() self.informViewBoundsChanged() self.bounds = [None, None] self.invalidate() self.updateSpots(newData) self.sigPlotChanged.emit(self)
def invalidate(self): ## clear any cached drawing state self.picture = None self.update() def getData(self): return self.data['x'], self.data['y'] def setPoints(self, *args, **kargs): ##Deprecated; use setData return self.setData(*args, **kargs) def implements(self, interface=None): ints = ['plotData'] if interface is None: return ints return interface in ints def name(self): return self.opts.get('name', None)
[docs] def setPen(self, *args, **kargs): """Set the pen(s) used to draw the outline around each spot. If a list or array is provided, then the pen for each spot will be set separately. Otherwise, the arguments are passed to pg.mkPen and used as the default pen for all spots which do not have a pen explicitly set.""" update = kargs.pop('update', True) dataSet = kargs.pop('dataSet', self.data) if len(args) == 1 and (isinstance(args[0], np.ndarray) or isinstance(args[0], list)): pens = args[0] if 'mask' in kargs and kargs['mask'] is not None: pens = pens[kargs['mask']] if len(pens) != len(dataSet): raise Exception("Number of pens does not match number of points (%d != %d)" % (len(pens), len(dataSet))) dataSet['pen'] = pens else: self.opts['pen'] = fn.mkPen(*args, **kargs) dataSet['sourceRect'] = None if update: self.updateSpots(dataSet)
[docs] def setBrush(self, *args, **kargs): """Set the brush(es) used to fill the interior of each spot. If a list or array is provided, then the brush for each spot will be set separately. Otherwise, the arguments are passed to pg.mkBrush and used as the default brush for all spots which do not have a brush explicitly set.""" update = kargs.pop('update', True) dataSet = kargs.pop('dataSet', self.data) if len(args) == 1 and (isinstance(args[0], np.ndarray) or isinstance(args[0], list)): brushes = args[0] if 'mask' in kargs and kargs['mask'] is not None: brushes = brushes[kargs['mask']] if len(brushes) != len(dataSet): raise Exception("Number of brushes does not match number of points (%d != %d)" % (len(brushes), len(dataSet))) dataSet['brush'] = brushes else: self.opts['brush'] = fn.mkBrush(*args, **kargs) #self._spotPixmap = None dataSet['sourceRect'] = None if update: self.updateSpots(dataSet)
[docs] def setSymbol(self, symbol, update=True, dataSet=None, mask=None): """Set the symbol(s) used to draw each spot. If a list or array is provided, then the symbol for each spot will be set separately. Otherwise, the argument will be used as the default symbol for all spots which do not have a symbol explicitly set.""" if dataSet is None: dataSet = self.data if isinstance(symbol, np.ndarray) or isinstance(symbol, list): symbols = symbol if mask is not None: symbols = symbols[mask] if len(symbols) != len(dataSet): raise Exception("Number of symbols does not match number of points (%d != %d)" % (len(symbols), len(dataSet))) dataSet['symbol'] = symbols else: self.opts['symbol'] = symbol self._spotPixmap = None dataSet['sourceRect'] = None if update: self.updateSpots(dataSet)
[docs] def setSize(self, size, update=True, dataSet=None, mask=None): """Set the size(s) used to draw each spot. If a list or array is provided, then the size for each spot will be set separately. Otherwise, the argument will be used as the default size for all spots which do not have a size explicitly set.""" if dataSet is None: dataSet = self.data if isinstance(size, np.ndarray) or isinstance(size, list): sizes = size if mask is not None: sizes = sizes[mask] if len(sizes) != len(dataSet): raise Exception("Number of sizes does not match number of points (%d != %d)" % (len(sizes), len(dataSet))) dataSet['size'] = sizes else: self.opts['size'] = size self._spotPixmap = None dataSet['sourceRect'] = None if update: self.updateSpots(dataSet)
def setPointData(self, data, dataSet=None, mask=None): if dataSet is None: dataSet = self.data if isinstance(data, np.ndarray) or isinstance(data, list): if mask is not None: data = data[mask] if len(data) != len(dataSet): raise Exception("Length of meta data does not match number of points (%d != %d)" % (len(data), len(dataSet))) ## Bug: If data is a numpy record array, then items from that array must be copied to dataSet one at a time. ## (otherwise they are converted to tuples and thus lose their field names. if isinstance(data, np.ndarray) and (data.dtype.fields is not None)and len(data.dtype.fields) > 1: for i, rec in enumerate(data): dataSet['data'][i] = rec else: dataSet['data'] = data def setPxMode(self, mode): if self.opts['pxMode'] == mode: return self.opts['pxMode'] = mode self.invalidate() def updateSpots(self, dataSet=None): if dataSet is None: dataSet = self.data invalidate = False if self.opts['pxMode']: mask = np.equal(dataSet['sourceRect'], None) if np.any(mask): invalidate = True opts = self.getSpotOpts(dataSet[mask]) sourceRect = self.fragmentAtlas.getSymbolCoords(opts) dataSet['sourceRect'][mask] = sourceRect self.fragmentAtlas.getAtlas() # generate atlas so source widths are available. dataSet['width'] = np.array(list(imap(QtCore.QRectF.width, dataSet['sourceRect'])))/2 dataSet['targetRect'] = None self._maxSpotPxWidth = self.fragmentAtlas.max_width else: self._maxSpotWidth = 0 self._maxSpotPxWidth = 0 self.measureSpotSizes(dataSet) if invalidate: self.invalidate() def getSpotOpts(self, recs, scale=1.0): if recs.ndim == 0: rec = recs symbol = rec['symbol'] if symbol is None: symbol = self.opts['symbol'] size = rec['size'] if size < 0: size = self.opts['size'] pen = rec['pen'] if pen is None: pen = self.opts['pen'] brush = rec['brush'] if brush is None: brush = self.opts['brush'] return (symbol, size*scale, fn.mkPen(pen), fn.mkBrush(brush)) else: recs = recs.copy() recs['symbol'][np.equal(recs['symbol'], None)] = self.opts['symbol'] recs['size'][np.equal(recs['size'], -1)] = self.opts['size'] recs['size'] *= scale recs['pen'][np.equal(recs['pen'], None)] = fn.mkPen(self.opts['pen']) recs['brush'][np.equal(recs['brush'], None)] = fn.mkBrush(self.opts['brush']) return recs def measureSpotSizes(self, dataSet): for rec in dataSet: ## keep track of the maximum spot size and pixel size symbol, size, pen, brush = self.getSpotOpts(rec) width = 0 pxWidth = 0 if self.opts['pxMode']: pxWidth = size + pen.widthF() else: width = size if pen.isCosmetic(): pxWidth += pen.widthF() else: width += pen.widthF() self._maxSpotWidth = max(self._maxSpotWidth, width) self._maxSpotPxWidth = max(self._maxSpotPxWidth, pxWidth) self.bounds = [None, None]
[docs] def clear(self): """Remove all spots from the scatter plot""" #self.clearItems() self.data = np.empty(0, dtype=self.data.dtype) self.bounds = [None, None] self.invalidate()
def dataBounds(self, ax, frac=1.0, orthoRange=None): if frac >= 1.0 and orthoRange is None and self.bounds[ax] is not None: return self.bounds[ax] #self.prepareGeometryChange() if self.data is None or len(self.data) == 0: return (None, None) if ax == 0: d = self.data['x'] d2 = self.data['y'] elif ax == 1: d = self.data['y'] d2 = self.data['x'] if orthoRange is not None: mask = (d2 >= orthoRange[0]) * (d2 <= orthoRange[1]) d = d[mask] d2 = d2[mask] if frac >= 1.0: self.bounds[ax] = (np.nanmin(d) - self._maxSpotWidth*0.7072, np.nanmax(d) + self._maxSpotWidth*0.7072) return self.bounds[ax] elif frac <= 0.0: raise Exception("Value for parameter 'frac' must be > 0. (got %s)" % str(frac)) else: mask = np.isfinite(d) d = d[mask] return np.percentile(d, [50 * (1 - frac), 50 * (1 + frac)]) def pixelPadding(self): return self._maxSpotPxWidth*0.7072 def boundingRect(self): (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 px = py = 0.0 pxPad = self.pixelPadding() if pxPad > 0: # determine length of pixel in local x, y directions px, py = self.pixelVectors() try: px = 0 if px is None else px.length() except OverflowError: px = 0 try: py = 0 if py is None else py.length() except OverflowError: py = 0 # return bounds expanded by pixel size px *= pxPad py *= pxPad return QtCore.QRectF(xmn-px, ymn-py, (2*px)+xmx-xmn, (2*py)+ymx-ymn) def viewTransformChanged(self): self.prepareGeometryChange() GraphicsObject.viewTransformChanged(self) self.bounds = [None, None] self.data['targetRect'] = None def setExportMode(self, *args, **kwds): GraphicsObject.setExportMode(self, *args, **kwds) self.invalidate() def mapPointsToDevice(self, pts): # Map point locations to device tr = self.deviceTransform() if tr is None: return None #pts = np.empty((2,len(self.data['x']))) #pts[0] = self.data['x'] #pts[1] = self.data['y'] pts = fn.transformCoordinates(tr, pts) pts -= self.data['width'] pts = np.clip(pts, -2**30, 2**30) ## prevent Qt segmentation fault. return pts def getViewMask(self, pts): # Return bool mask indicating all points that are within viewbox # pts is expressed in *device coordiantes* vb = self.getViewBox() if vb is None: return None viewBounds = vb.mapRectToDevice(vb.boundingRect()) w = self.data['width'] mask = ((pts[0] + w > viewBounds.left()) & (pts[0] - w < viewBounds.right()) & (pts[1] + w > viewBounds.top()) & (pts[1] - w < viewBounds.bottom())) ## remove out of view points return mask @debug.warnOnException ## raising an exception here causes crash def paint(self, p, *args): #p.setPen(fn.mkPen('r')) #p.drawRect(self.boundingRect()) if self._exportOpts is not False: aa = self._exportOpts.get('antialias', True) scale = self._exportOpts.get('resolutionScale', 1.0) ## exporting to image; pixel resolution may have changed else: aa = self.opts['antialias'] scale = 1.0 if self.opts['pxMode'] is True: p.resetTransform() # Map point coordinates to device pts = np.vstack([self.data['x'], self.data['y']]) pts = self.mapPointsToDevice(pts) if pts is None: return # Cull points that are outside view viewMask = self.getViewMask(pts) #pts = pts[:,mask] #data = self.data[mask] if self.opts['useCache'] and self._exportOpts is False: # Draw symbols from pre-rendered atlas atlas = self.fragmentAtlas.getAtlas() # Update targetRects if necessary updateMask = viewMask & np.equal(self.data['targetRect'], None) if np.any(updateMask): updatePts = pts[:,updateMask] width = self.data[updateMask]['width']*2 self.data['targetRect'][updateMask] = list(imap(QtCore.QRectF, updatePts[0,:], updatePts[1,:], width, width)) data = self.data[viewMask] if USE_PYSIDE or USE_PYQT5: list(imap(p.drawPixmap, data['targetRect'], repeat(atlas), data['sourceRect'])) else: p.drawPixmapFragments(data['targetRect'].tolist(), data['sourceRect'].tolist(), atlas) else: # render each symbol individually p.setRenderHint(p.Antialiasing, aa) data = self.data[viewMask] pts = pts[:,viewMask] for i, rec in enumerate(data): p.resetTransform() p.translate(pts[0,i] + rec['width'], pts[1,i] + rec['width']) drawSymbol(p, *self.getSpotOpts(rec, scale)) else: if self.picture is None: self.picture = QtGui.QPicture() p2 = QtGui.QPainter(self.picture) for rec in self.data: if scale != 1.0: rec = rec.copy() rec['size'] *= scale p2.resetTransform() p2.translate(rec['x'], rec['y']) drawSymbol(p2, *self.getSpotOpts(rec, scale)) p2.end() p.setRenderHint(p.Antialiasing, aa) self.picture.play(p) def points(self): for rec in self.data: if rec['item'] is None: rec['item'] = SpotItem(rec, self) return self.data['item'] def pointsAt(self, pos): x = pos.x() y = pos.y() pw = self.pixelWidth() ph = self.pixelHeight() pts = [] for s in self.points(): sp = s.pos() ss = s.size() sx = sp.x() sy = sp.y() s2x = s2y = ss * 0.5 if self.opts['pxMode']: 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) return pts[::-1] 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(object): """ Class referring to individual spots in a scatter plot. These can be retrieved by calling ScatterPlotItem.points() or by connecting to the ScatterPlotItem's click signals. """ def __init__(self, data, plot): #GraphicsItem.__init__(self, register=False) self._data = data self._plot = plot #self.setParentItem(plot) #self.setPos(QtCore.QPointF(data['x'], data['y'])) #self.updateItem() def data(self): """Return the user data associated with this spot.""" return self._data['data'] def size(self): """Return the size of this spot. If the spot has no explicit size set, then return the ScatterPlotItem's default size instead.""" if self._data['size'] == -1: return self._plot.opts['size'] else: return self._data['size'] def pos(self): return Point(self._data['x'], self._data['y']) def viewPos(self): return self._plot.mapToView(self.pos()) def setSize(self, size): """Set the size of this spot. If the size is set to -1, then the ScatterPlotItem's default size will be used instead.""" self._data['size'] = size self.updateItem() def symbol(self): """Return the symbol of this spot. If the spot has no explicit symbol set, then return the ScatterPlotItem's default symbol instead. """ symbol = self._data['symbol'] if symbol is None: symbol = self._plot.opts['symbol'] try: n = int(symbol) symbol = list(Symbols.keys())[n % len(Symbols)] except: pass return symbol def setSymbol(self, symbol): """Set the symbol for this spot. If the symbol is set to '', then the ScatterPlotItem's default symbol will be used instead.""" self._data['symbol'] = symbol self.updateItem() def pen(self): pen = self._data['pen'] if pen is None: pen = self._plot.opts['pen'] return fn.mkPen(pen) def setPen(self, *args, **kargs): """Set the outline pen for this spot""" pen = fn.mkPen(*args, **kargs) self._data['pen'] = pen self.updateItem() def resetPen(self): """Remove the pen set for this spot; the scatter plot's default pen will be used instead.""" self._data['pen'] = None ## Note this is NOT the same as calling setPen(None) self.updateItem() def brush(self): brush = self._data['brush'] if brush is None: brush = self._plot.opts['brush'] return fn.mkBrush(brush) def setBrush(self, *args, **kargs): """Set the fill brush for this spot""" brush = fn.mkBrush(*args, **kargs) self._data['brush'] = brush self.updateItem() def resetBrush(self): """Remove the brush set for this spot; the scatter plot's default brush will be used instead.""" self._data['brush'] = None ## Note this is NOT the same as calling setBrush(None) self.updateItem() def setData(self, data): """Set the user-data associated with this spot""" self._data['data'] = data def updateItem(self): self._data['sourceRect'] = None self._plot.updateSpots(self._data.reshape(1)) self._plot.invalidate() #class PixmapSpotItem(SpotItem, QtGui.QGraphicsPixmapItem): #def __init__(self, data, plot): #QtGui.QGraphicsPixmapItem.__init__(self) #self.setFlags(self.flags() | self.ItemIgnoresTransformations) #SpotItem.__init__(self, data, plot) #def setPixmap(self, pixmap): #QtGui.QGraphicsPixmapItem.setPixmap(self, pixmap) #self.setOffset(-pixmap.width()/2.+0.5, -pixmap.height()/2.) #def updateItem(self): #symbolOpts = (self._data['pen'], self._data['brush'], self._data['size'], self._data['symbol']) ### If all symbol options are default, use default pixmap #if symbolOpts == (None, None, -1, ''): #pixmap = self._plot.defaultSpotPixmap() #else: #pixmap = makeSymbolPixmap(size=self.size(), pen=self.pen(), brush=self.brush(), symbol=self.symbol()) #self.setPixmap(pixmap) #class PathSpotItem(SpotItem, QtGui.QGraphicsPathItem): #def __init__(self, data, plot): #QtGui.QGraphicsPathItem.__init__(self) #SpotItem.__init__(self, data, plot) #def updateItem(self): #QtGui.QGraphicsPathItem.setPath(self, Symbols[self.symbol()]) #QtGui.QGraphicsPathItem.setPen(self, self.pen()) #QtGui.QGraphicsPathItem.setBrush(self, self.brush()) #size = self.size() #self.resetTransform() #self.scale(size, size)