wavetable.py 文件源码

def createDragData(self):
        self.drag = QtGui.QDrag(self)
        data = QtCore.QMimeData()
        wave_len = self.selection[1] + 1 - self.selection[0]
        samples = self.current_data[self.selection[0] * 256 + self.offset:(self.selection[1] + 1) * 256 + self.offset]
        data.setData('audio/wavesamples', samples)
        data.setText(self.current_source)
        path = QtGui.QPainterPath()
        sampwidth_int = self.current_sampwidth_int / 2
        path.moveTo(0, sampwidth_int - audioop.getsample(samples, self.current_sampwidth, 0))
        for s in xrange(1, len(samples)/2):
            path.lineTo(s, sampwidth_int - audioop.getsample(samples, self.current_sampwidth, s))
        wave_size = self.main.wavetable_view.width() / 64
        pixmap = QtGui.QPixmap(wave_size * wave_len, 48)
        pixmap.fill(QtCore.Qt.transparent)
        qp = QtGui.QPainter(pixmap)
        qp.setRenderHints(qp.Antialiasing)
        qp.scale((wave_size * wave_len / path.boundingRect().width()), 48. / self.current_sampwidth_int)
        qp.drawPath(path)
        qp.end()
        self.drag.setPixmap(pixmap)
        self.drag.setMimeData(data)
        self.drag.exec_()