Python QGraphicsLineItem.setPos方法代码示例

# 需要导入模块: from PyQt5.QtWidgets import QGraphicsLineItem [as 别名]
# 或者: from PyQt5.QtWidgets.QGraphicsLineItem import setPos [as 别名]
    def drawGrid(self):
        black_notes = [2,4,6,9,11]
        scale_bar = QGraphicsRectItem(0, 0, self.grid_width, self.note_height, self.piano)
        scale_bar.setPos(self.piano_width, 0)
        scale_bar.setBrush(QColor(100,100,100))
        clearpen = QPen(QColor(0,0,0,0))
        for i in range(self.end_octave - self.start_octave, self.start_octave - self.start_octave, -1):
            for j in range(self.notes_in_octave, 0, -1):
                scale_bar = QGraphicsRectItem(0, 0, self.grid_width, self.note_height, self.piano)
                scale_bar.setPos(self.piano_width, self.note_height * j + self.octave_height * (i - 1))
                scale_bar.setPen(clearpen)
                if j not in black_notes:
                    scale_bar.setBrush(QColor(120,120,120))
                else:
                    scale_bar.setBrush(QColor(100,100,100))

        measure_pen = QPen(QColor(0, 0, 0, 120), 3)
        half_measure_pen = QPen(QColor(0, 0, 0, 40), 2)
        line_pen = QPen(QColor(0, 0, 0, 40))
        for i in range(0, int(self.num_measures) + 1):
            measure = QGraphicsLineItem(0, 0, 0, self.piano_height + self.header_height - measure_pen.width(), self.header)
            measure.setPos(self.measure_width * i, 0.5 * measure_pen.width())
            measure.setPen(measure_pen)
            if i < self.num_measures:
                number = QGraphicsSimpleTextItem('%d' % (i + 1), self.header)
                number.setPos(self.measure_width * i + 5, 2)
                number.setBrush(Qt.white)
                for j in self.frange(0, self.time_sig[0]*self.grid_div/self.time_sig[1], 1.):
                    line = QGraphicsLineItem(0, 0, 0, self.piano_height, self.header)
                    line.setZValue(1.0)
                    line.setPos(self.measure_width * i + self.value_width * j, self.header_height)
                    if j == self.time_sig[0]*self.grid_div/self.time_sig[1] / 2.0:
                        line.setPen(half_measure_pen)
                    else:
                        line.setPen(line_pen)

# 需要导入模块: from PyQt5.QtWidgets import QGraphicsLineItem [as 别名]
# 或者: from PyQt5.QtWidgets.QGraphicsLineItem import setPos [as 别名]
class RotaryDialHoverRegion(QGraphicsEllipseItem):
    def __init__(self, rect, parent=None):
        # setup DNA line
        super(QGraphicsEllipseItem, self).__init__(rect, parent)
        self._parent = parent
        self.setPen(QPen(Qt.NoPen))
        self.setBrush(_HOVER_BRUSH)
        self.setAcceptHoverEvents(True)

        # hover marker
        self._hoverLine = QGraphicsLineItem(-_ROTARY_DELTA_WIDTH/2, 0, _ROTARY_DELTA_WIDTH/2, 0, self)
        self._hoverLine.setPen(QPen(QColor(204, 0, 0), .5))
        self._hoverLine.hide()

        self._startPos = None
        self._startAngle = None  # save selection start
        self._clockwise = None
        self.dummy = RotaryDialDeltaItem(0, 0, parent)
        self.dummy.hide()

    def updateRect(self, rect):
        self.setRect(rect)

    def hoverEnterEvent(self, event):
        self.updateHoverLine(event)
        self._hoverLine.show()
    # end def

    def hoverMoveEvent(self, event):
        self.updateHoverLine(event)
    # end def

    def hoverLeaveEvent(self, event):
        self._hoverLine.hide()
    # end def

    def mousePressEvent(self, event):
        r = _RADIUS
        self.updateHoverLine(event)
        pos = self._hoverLine.pos()
        aX, aY, angle = self.snapPosToCircle(pos, r)
        if angle != None:
            self._startPos = QPointF(aX, aY)
            self._startAngle = self.updateHoverLine(event)
            self.dummy.updateAngle(self._startAngle, 0)
            self.dummy.show()
        # mark the start
        # f = QGraphicsEllipseItem(pX, pY, 2, 2, self)
        # f.setPen(QPen(Qt.NoPen))
        # f.setBrush(QBrush(QColor(204, 0, 0)))
    # end def

    def mouseMoveEvent(self, event):
        eventAngle = self.updateHoverLine(event)
        # Record initial direction before calling getSpanAngle
        if self._clockwise is None:
            self._clockwise = False if eventAngle > self._startAngle else True
        spanAngle = self.getSpanAngle(eventAngle)
        self.dummy.updateAngle(self._startAngle, spanAngle)
    # end def

    def mouseReleaseEvent(self, event):
        self.dummy.hide()
        endAngle = self.updateHoverLine(event)
        spanAngle = self.getSpanAngle(endAngle)
        old_angle = self._parent.virtualHelix().getProperty('eulerZ')
        new_angle = round((old_angle - spanAngle) % 360,0)
        self._parent.virtualHelix().setProperty('eulerZ', new_angle)

        # mark the end
        # x = self._hoverLine.x()
        # y = self._hoverLine.y()
        # f = QGraphicsEllipseItem(x, y, 6, 6, self)
        # f.setPen(QPen(Qt.NoPen))
        # f.setBrush(QBrush(QColor(204, 0, 0, 128)))
    # end def

    def updateHoverLine(self, event):
        """
        Moves red line to point (aX,aY) on RotaryDialLine closest to event.pos.
        Returns the angle of aX, aY, using the Qt arc coordinate system
        (0 = east, 90 = north, 180 = west, 270 = south).
        """
        r = _RADIUS
        aX, aY, angle = self.snapPosToCircle(event.pos(), r)
        if angle != None:
            self._hoverLine.setPos(aX, aY)
            self._hoverLine.setRotation(-angle)
        return angle
    # end def

    def snapPosToCircle(self, pos, radius):
        """Given x, y and radius, return x,y of nearest point on circle, and its angle"""
        pX = pos.x()
        pY = pos.y()
        cX = cY = radius
        vX = pX - cX
        vY = pY - cY
        magV = sqrt(vX*vX + vY*vY)
        if magV == 0:
#.........这里部分代码省略.........