ccspecan.py 文件源码

def _draw_reticle(self):
        if self._reticle is None or (self._reticle.size() != self.size()):
            self._new_reticle()

            dbm_lines = [QLineF(self._hz_to_x(self._low_frequency), self._dbm_to_y(dbm),
                                self._hz_to_x(self._high_frequency), self._dbm_to_y(dbm))
                         for dbm in numpy.arange(self._low_dbm, self._high_dbm, 20.0)]
            dbm_labels = [(dbm, QPointF(self._hz_to_x(self._low_frequency) + 2, self._dbm_to_y(dbm) - 2))
                          for dbm in numpy.arange(self._low_dbm, self._high_dbm, 20.0)]

            frequency_lines = [QLineF(self._hz_to_x(frequency), self._dbm_to_y(self._high_dbm),
                                      self._hz_to_x(frequency), self._dbm_to_y(self._low_dbm))
                               for frequency in numpy.arange(self._low_frequency, self._high_frequency, self._frequency_step * 20.0)]
            frequency_labels = [(frequency, QPointF(self._hz_to_x(frequency) + 2, self._dbm_to_y(self._high_dbm) + 10))
                                for frequency in numpy.arange(self._low_frequency, self._high_frequency, self._frequency_step * 10.0)]

            painter = QtGui.QPainter(self._reticle)
            try:
                painter.setRenderHint(QtGui.QPainter.Antialiasing)

                painter.setPen(Qt.blue)

                # TODO: Removed to support old (<1.0) PySide API in Ubuntu 10.10
                #painter.drawLines(dbm_lines)
                for dbm_line in dbm_lines: painter.drawLine(dbm_line)
                # TODO: Removed to support old (<1.0) PySide API in Ubuntu 10.10
                #painter.drawLines(frequency_lines)
                for frequency_line in frequency_lines: painter.drawLine(frequency_line)

                painter.setPen(Qt.white)
                for dbm, point in dbm_labels:
                    painter.drawText(point, '%+.0f' % dbm)
                for frequency, point in frequency_labels:
                    painter.drawText(point, '%.02f' % (frequency / 1e6))

            finally:
                painter.end()