Esempio n. 1
0
    def drawSymbols(self, painter, points, numPoints=None):
        """
        Render an array of symbols

        Painting several symbols is more effective than drawing symbols
        one by one, as a couple of layout calculations and setting of pen/brush
        can be done once for the complete array.

        :param QPainter painter: Painter
        :param QPolygonF points: Positions of the symbols in screen coordinates
        """
        #TODO: remove argument numPoints (not necessary in `PythonQwt`)
        if numPoints is not None and numPoints <= 0:
            return
        useCache = False
        if QwtPainter.roundingAlignment(painter) and\
           not painter.transform().isScaling():
            if self.__data.cache.policy == QwtSymbol.Cache:
                useCache = True
            elif self.__data.cache.policy == QwtSymbol.AutoCache:
                if painter.paintEngine().type() == QPaintEngine.Raster:
                    useCache = True
                else:
                    if self.__data.style in (QwtSymbol.XCross, QwtSymbol.HLine,
                                             QwtSymbol.VLine, QwtSymbol.Cross):
                        pass
                    elif self.__data.style == QwtSymbol.Pixmap:
                        if not self.__data.size.isEmpty() and\
                           self.__data.size != self.__data.pixmap.pixmap.size():
                            useCache = True
                    else:
                        useCache = True
        if useCache:
            br = QRect(self.boundingRect())
            rect = QRect(0, 0, br.width(), br.height())
            if self.__data.cache.pixmap.isNull():
                self.__data.cache.pixmap = QwtPainter.backingStore(
                    None, br.size())
                self.__data.cache.pixmap.fill(Qt.transparent)
                p = QPainter(self.__data.cache.pixmap)
                p.setRenderHints(painter.renderHints())
                p.translate(-br.topLeft())
                pos = QPointF()
                self.renderSymbols(p, pos, 1)
            dx = br.left()
            dy = br.top()
            for point in points:
                left = round(point.x()) + dx
                top = round(point.y()) + dy
                painter.drawPixmap(left, top, self.__data.cache.pixmap)
        else:
            painter.save()
            self.renderSymbols(painter, points, numPoints)
            painter.restore()
Esempio n. 2
0
    def drawSymbols(self, painter, points, numPoints=None):
        """
        Render an array of symbols

        Painting several symbols is more effective than drawing symbols
        one by one, as a couple of layout calculations and setting of pen/brush
        can be done once for the complete array.

        :param QPainter painter: Painter
        :param QPolygonF points: Positions of the symbols in screen coordinates
        """
        #TODO: remove argument numPoints (not necessary in `PythonQwt`)
        if numPoints is not None and numPoints <= 0:
            return
        useCache = False
        if QwtPainter.roundingAlignment(painter) and\
           not painter.transform().isScaling():
            if self.__data.cache.policy == QwtSymbol.Cache:
                useCache = True
            elif self.__data.cache.policy == QwtSymbol.AutoCache:
                if painter.paintEngine().type() == QPaintEngine.Raster:
                    useCache = True
                else:
                    if self.__data.style in (QwtSymbol.XCross, QwtSymbol.HLine,
                                             QwtSymbol.VLine, QwtSymbol.Cross):
                        pass
                    elif self.__data.style == QwtSymbol.Pixmap:
                        if not self.__data.size.isEmpty() and\
                           self.__data.size != self.__data.pixmap.pixmap.size():
                            useCache = True
                    else:
                        useCache = True
        if useCache:
            br = QRect(self.boundingRect())
            rect = QRect(0, 0, br.width(), br.height())
            if self.__data.cache.pixmap.isNull():
                self.__data.cache.pixmap = QwtPainter.backingStore(None, br.size())
                self.__data.cache.pixmap.fill(Qt.transparent)
                p = QPainter(self.__data.cache.pixmap)
                p.setRenderHints(painter.renderHints())
                p.translate(-br.topLeft())
                pos = QPointF()
                self.renderSymbols(p, pos, 1)
            dx = br.left()
            dy = br.top()
            for point in points:
                left = round(point.x())+dx
                top = round(point.y())+dy
                painter.drawPixmap(left, top, self.__data.cache.pixmap)
        else:
            painter.save()
            self.renderSymbols(painter, points, numPoints)
            painter.restore()
Esempio n. 3
0
 def drawSymbols(self, painter, points, numPoints=None):
     #TODO: remove argument numPoints (not necessary in Python's qwt)
     if numPoints is not None and numPoints <= 0:
         return
     useCache = False
     if QwtPainter.roundingAlignment(painter) and\
        not painter.transform().isScaling():
         if self.__data.cache.policy == QwtSymbol.Cache:
             useCache = True
         elif self.__data.cache.policy == QwtSymbol.AutoCache:
             if painter.paintEngine().type() == QPaintEngine.Raster:
                 useCache = True
             else:
                 if self.__data.style in (QwtSymbol.XCross, QwtSymbol.HLine,
                                          QwtSymbol.VLine, QwtSymbol.Cross):
                     pass
                 elif self.__data.style == QwtSymbol.Pixmap:
                     if not self.__data.size.isEmpty() and\
                        self.__data.size != self.__data.pixmap.pixmap.size():
                         useCache = True
                 else:
                     useCache = True
     if useCache:
         br = QRect(self.boundingRect())
         rect = QRect(0, 0, br.width(), br.height())
         if self.__data.cache.pixmap.isNull():
             self.__data.cache.pixmap = QwtPainter.backingStore(None, br.size())
             self.__data.cache.pixmap.fill(Qt.transparent)
             p = QPainter(self.__data.cache.pixmap)
             p.setRenderHints(painter.renderHints())
             p.translate(-br.topLeft())
             pos = QPointF()
             self.renderSymbols(p, pos, 1)
         dx = br.left()
         dy = br.top()
         for point in points:
             left = round(point.x())+dx
             top = round(point.y())+dy
             painter.drawPixmap(left, top, self.__data.cache.pixmap)
     else:
         painter.save()
         self.renderSymbols(painter, points, numPoints)
         painter.restore()