Python QLineF.dx方法代码示例

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
    def timerEvent(self):
        # Don't move too far away.
        lineToCenter = QLineF(QPointF(0, 0), self.mapFromScene(0, 0))
        if lineToCenter.length() > 150:
            angleToCenter = math.acos(lineToCenter.dx() / lineToCenter.length())
            if lineToCenter.dy() < 0:
                angleToCenter = Mouse.TwoPi - angleToCenter;
            angleToCenter = Mouse.normalizeAngle((Mouse.Pi - angleToCenter) + Mouse.Pi / 2)

            if angleToCenter < Mouse.Pi and angleToCenter > Mouse.Pi / 4:
                # Rotate left.
                self.angle += [-0.25, 0.25][self.angle < -Mouse.Pi / 2]
            elif angleToCenter >= Mouse.Pi and angleToCenter < (Mouse.Pi + Mouse.Pi / 2 + Mouse.Pi / 4):
                # Rotate right.
                self.angle += [-0.25, 0.25][self.angle < Mouse.Pi / 2]
        elif math.sin(self.angle) < 0:
            self.angle += 0.25
        elif math.sin(self.angle) > 0:
            self.angle -= 0.25

        # Try not to crash with any other mice.
        dangerMice = self.scene().items(QPolygonF([self.mapToScene(0, 0),
                                                         self.mapToScene(-30, -50),
                                                         self.mapToScene(30, -50)]))

        for item in dangerMice:
            if item is self:
                continue
        
            lineToMouse = QLineF(QPointF(0, 0), self.mapFromItem(item, 0, 0))
            angleToMouse = math.acos(lineToMouse.dx() / lineToMouse.length())
            if lineToMouse.dy() < 0:
                angleToMouse = Mouse.TwoPi - angleToMouse
            angleToMouse = Mouse.normalizeAngle((Mouse.Pi - angleToMouse) + Mouse.Pi / 2)

            if angleToMouse >= 0 and angleToMouse < Mouse.Pi / 2:
                # Rotate right.
                self.angle += 0.5
            elif angleToMouse <= Mouse.TwoPi and angleToMouse > (Mouse.TwoPi - Mouse.Pi / 2):
                # Rotate left.
                self.angle -= 0.5

        # Add some random movement.
        if len(dangerMice) > 1 and (qrand() % 10) == 0:
            if qrand() % 1:
                self.angle += (qrand() % 100) / 500.0
            else:
                self.angle -= (qrand() % 100) / 500.0

        self.speed += (-50 + qrand() % 100) / 100.0

        dx = math.sin(self.angle) * 10
        self.mouseEyeDirection = 0.0 if qAbs(dx / 5) < 1 else dx / 5

        self.setRotation(self.rotation() + dx)
        self.setPos(self.mapToParent(0, -(3 + math.sin(self.speed) * 3)))

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
    def paint(self, painter, option, widget):
        """
        Customize line adding an arrow head

        :param QPainter painter: Painter instance of the item
        :param option:  Painter option of the item
        :param widget:  Widget instance
        """
        if not self.source or not self.destination:
            return
        line = QLineF(self.source_point, self.destination_point)
        if qFuzzyCompare(line.length(), 0):
            return

        # Draw the line itself
        color = QColor()
        color.setHsv(120 - 60 / self.steps_max * self.steps,
                     180 + 50 / self.steps_max * self.steps,
                     150 + 80 / self.steps_max * self.steps)
        if self.highlighted:
            color.setHsv(0, 0, 0)

        style = self.line_style

        painter.setPen(QPen(color, 1, style, Qt.RoundCap, Qt.RoundJoin))
        painter.drawLine(line)
        painter.setPen(QPen(color, 1, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))

        # Draw the arrows
        angle = math.acos(line.dx() / line.length())
        if line.dy() >= 0:
            angle = (2.0 * math.pi) - angle

        #  arrow in the middle of the arc
        hpx = line.p1().x() + (line.dx() / 2.0)
        hpy = line.p1().y() + (line.dy() / 2.0)
        head_point = QPointF(hpx, hpy)

        painter.setPen(QPen(color, 1, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
        destination_arrow_p1 = head_point + QPointF(
            math.sin(angle - math.pi / 3) * self.arrow_size,
            math.cos(angle - math.pi / 3) * self.arrow_size)
        destination_arrow_p2 = head_point + QPointF(
            math.sin(angle - math.pi + math.pi / 3) * self.arrow_size,
            math.cos(angle - math.pi + math.pi / 3) * self.arrow_size)

        painter.setBrush(color)
        painter.drawPolygon(QPolygonF([head_point, destination_arrow_p1, destination_arrow_p2]))

        if self.metadata["confirmation_text"]:
            painter.drawText(head_point, self.metadata["confirmation_text"])

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
    def paint(self, painter, option, widget):
        """
        Customize line adding an arrow head

        :param QPainter painter: Painter instance of the item
        :param option:  Painter option of the item
        :param widget:  Widget instance
        """
        if not self.source or not self.destination:
            return
        line = QLineF(self.source_point, self.destination_point)
        if qFuzzyCompare(line.length(), 0):
            return

        # Draw the line itself
        color = QColor()
        style = Qt.SolidLine
        if self.status == ARC_STATUS_STRONG:
            color.setNamedColor('blue')
        if self.status == ARC_STATUS_WEAK:
            color.setNamedColor('salmon')
            style = Qt.DashLine

        painter.setPen(QPen(color, 1, style, Qt.RoundCap, Qt.RoundJoin))
        painter.drawLine(line)
        painter.setPen(QPen(color, 1, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))

        # Draw the arrows
        angle = math.acos(line.dx() / line.length())
        if line.dy() >= 0:
            angle = (2.0 * math.pi) - angle

        #  arrow in the middle of the arc
        hpx = line.p1().x() + (line.dx() / 2.0)
        hpy = line.p1().y() + (line.dy() / 2.0)
        head_point = QPointF(hpx, hpy)

        painter.setPen(QPen(color, 1, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
        destination_arrow_p1 = head_point + QPointF(
            math.sin(angle - math.pi / 3) * self.arrow_size,
            math.cos(angle - math.pi / 3) * self.arrow_size)
        destination_arrow_p2 = head_point + QPointF(
            math.sin(angle - math.pi + math.pi / 3) * self.arrow_size,
            math.cos(angle - math.pi + math.pi / 3) * self.arrow_size)

        painter.setBrush(color)
        painter.drawPolygon(QPolygonF([head_point, destination_arrow_p1, destination_arrow_p2]))

        if self.metadata["confirmation_text"]:
            painter.drawText(head_point, self.metadata["confirmation_text"])

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
class GuideLine(Guide):
    def __init__(self, line_or_point, follows=None):
        super(GuideLine, self).__init__(follows)

        if isinstance(line_or_point, QLineF):
            self.line = line_or_point
        elif follows is not None:
            self.line = QLineF(self.prevGuide.endPos(), line_or_point)
        else:
            self.line = QLineF(QPointF(0, 0), line_or_point)

    def length(self):
        return self.line.length()

    def startPos(self):
        return QPointF(self.line.p1().x() * self.scaleX,
                self.line.p1().y() * self.scaleY)

    def endPos(self):
        return QPointF(self.line.p2().x() * self.scaleX,
                self.line.p2().y() * self.scaleY)

    def guide(self, item, moveSpeed):
        frame = item.guideFrame - self.startLength
        endX = (self.line.p1().x() + (frame * self.line.dx() / self.length())) * self.scaleX
        endY = (self.line.p1().y() + (frame * self.line.dy() / self.length())) * self.scaleY
        pos = QPointF(endX, endY)
        self.move(item, pos, moveSpeed)

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
    def paint(self, painter, option, widget):
        if not self.source or not self.dest:
            return

        # Draw the line itself.
        line = QLineF(self.sourcePoint, self.destPoint)

        if line.length() == 0.0:
            return

        painter.setPen(QPen(Qt.black, 1, Qt.SolidLine, Qt.RoundCap,
                Qt.RoundJoin))
        painter.drawLine(line)

        # Draw the arrows if there's enough room.
        angle = math.acos(line.dx() / line.length())
        if line.dy() >= 0:
            angle = Edge.TwoPi - angle

        sourceArrowP1 = self.sourcePoint + QPointF(math.sin(angle + Edge.Pi / 3) * self.arrowSize,
                                                          math.cos(angle + Edge.Pi / 3) * self.arrowSize)
        sourceArrowP2 = self.sourcePoint + QPointF(math.sin(angle + Edge.Pi - Edge.Pi / 3) * self.arrowSize,
                                                          math.cos(angle + Edge.Pi - Edge.Pi / 3) * self.arrowSize);   
        destArrowP1 = self.destPoint + QPointF(math.sin(angle - Edge.Pi / 3) * self.arrowSize,
                                                      math.cos(angle - Edge.Pi / 3) * self.arrowSize)
        destArrowP2 = self.destPoint + QPointF(math.sin(angle - Edge.Pi + Edge.Pi / 3) * self.arrowSize,
                                                      math.cos(angle - Edge.Pi + Edge.Pi / 3) * self.arrowSize)

        painter.setBrush(Qt.black)
        painter.drawPolygon(QPolygonF([line.p1(), sourceArrowP1, sourceArrowP2]))
        painter.drawPolygon(QPolygonF([line.p2(), destArrowP1, destArrowP2]))

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
    def move(self, item, dest, moveSpeed):
        walkLine = QLineF(item.getGuidedPos(), dest)
        if moveSpeed >= 0 and walkLine.length() > moveSpeed:
            # The item is too far away from it's destination point so we move
            # it towards it instead.
            dx = walkLine.dx()
            dy = walkLine.dy()

            if abs(dx) > abs(dy):
                # Walk along x-axis.
                if dx != 0:
                    d = moveSpeed * dy / abs(dx)

                    if dx > 0:
                        s = moveSpeed
                    else:
                        s = -moveSpeed

                    dest.setX(item.getGuidedPos().x() + s)
                    dest.setY(item.getGuidedPos().y() + d)
            else:
                # Walk along y-axis.
                if dy != 0:
                    d = moveSpeed * dx / abs(dy)

                    if dy > 0:
                        s = moveSpeed
                    else:
                        s = -moveSpeed

                    dest.setX(item.getGuidedPos().x() + d)
                    dest.setY(item.getGuidedPos().y() + s)

        item.setGuidedPos(dest)

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
    def paint(self, painter, option, widget):
        assert self.fromSquare is not None
        assert self.toSquare is not None
        line = QLineF(self.sourcePoint, self.destPoint)

        assert(line.length() != 0.0)

        # Draw the arrows if there's enough room.
        angle = math.acos(line.dx() / line.length())
        if line.dy() >= 0:
            angle = (math.pi*2.0) - angle

        destArrowP1 = self.destPoint + QPointF(
                math.sin(angle - math.pi / 3) * self.arrowSize,
                math.cos(angle - math.pi / 3) * self.arrowSize
        )
        destArrowP2 = self.destPoint + QPointF(
                math.sin(angle - math.pi + math.pi / 3) * self.arrowSize,
                math.cos(angle - math.pi + math.pi / 3) * self.arrowSize
        )

        painter.setPen(self.pen)
        painter.setBrush(self.brush)
        # arrowhead1 = QPolygonF([line.p1(), sourceArrowP1, sourceArrowP2])
        arrowhead2 = QPolygonF([line.p2(), destArrowP1, destArrowP2])
        painter.drawPolygon(arrowhead2)

        painter.setPen(self.pen)
        painter.drawLine(line)

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
 def paint(self, painter, option, widget=None):
     """
     Public method to paint the item in local coordinates.
     
     @param painter reference to the painter object (QPainter)
     @param option style options (QStyleOptionGraphicsItem)
     @param widget optional reference to the widget painted on (QWidget)
     """
     if (option.state & QStyle.State_Selected) == \
             QStyle.State(QStyle.State_Selected):
         width = 2
     else:
         width = 1
     
     # draw the line first
     line = QLineF(self._origin, self._end)
     painter.setPen(
         QPen(Qt.black, width, Qt.SolidLine, Qt.FlatCap, Qt.MiterJoin))
     painter.drawLine(line)
     
     # draw the arrow head
     arrowAngle = self._type * ArrowheadAngleFactor
     slope = math.atan2(line.dy(), line.dx())
     
     # Calculate left arrow point
     arrowSlope = slope + arrowAngle
     a1 = QPointF(self._end.x() - self._halfLength * math.cos(arrowSlope),
                  self._end.y() - self._halfLength * math.sin(arrowSlope))
     
     # Calculate right arrow point
     arrowSlope = slope - arrowAngle
     a2 = QPointF(self._end.x() - self._halfLength * math.cos(arrowSlope),
                  self._end.y() - self._halfLength * math.sin(arrowSlope))
     
     if self._filled:
         painter.setBrush(Qt.black)
     else:
         painter.setBrush(Qt.white)
     polygon = QPolygonF()
     polygon.append(line.p2())
     polygon.append(a1)
     polygon.append(a2)
     painter.drawPolygon(polygon)

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
    def adjust(self):
        if not self.source or not self.dest:
            return

        line = QLineF(self.mapFromItem(self.source, 0, 0),
                self.mapFromItem(self.dest, 0, 0))
        length = line.length()

        self.prepareGeometryChange()

        if length > 20.0:
            edgeOffset = QPointF((line.dx() * 10) / length,
                    (line.dy() * 10) / length)

            self.sourcePoint = line.p1() + edgeOffset
            self.destPoint = line.p2() - edgeOffset
        else:
            self.sourcePoint = line.p1()
            self.destPoint = line.p1()

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
 def angle_arrow(self, path, origin='head'):
     ''' Compute the two points of the arrow head with the right angle '''
     if origin == 'tail':
         path = path.toReversed()
     length = path.length()
     percent = path.percentAtLength(length - 10.0)
     src = path.pointAtPercent(percent)
     #path.moveTo(path.pointAtPercent(1))
     end_point = path.pointAtPercent(1)
     #end_point = path.currentPosition()
     line = QLineF(src, end_point)
     angle = math.acos(line.dx() / (line.length() or 1))
     if line.dy() >= 0:
         angle = math.pi * 2 - angle
     arrow_size = 10.0
     arrow_p1 = end_point + QPointF(
             math.sin(angle - math.pi / 3) * arrow_size,
             math.cos(angle - math.pi / 3) * arrow_size)
     arrow_p2 = end_point + QPointF(
             math.sin(angle - math.pi + math.pi / 3) * arrow_size,
             math.cos(angle - math.pi + math.pi / 3) * arrow_size)
     return (arrow_p1, arrow_p2)

# 需要导入模块: from PyQt5.QtCore import QLineF [as 别名]
# 或者: from PyQt5.QtCore.QLineF import dx [as 别名]
    def calculateForces(self):
        if not self.scene() or self.scene().mouseGrabberItem() is self:
            self.newPos = self.pos()
            return
    
        # Sum up all forces pushing this item away.
        xvel = 0.0
        yvel = 0.0
        for item in self.scene().items():
            if not isinstance(item, Node):
                continue

            line = QLineF(self.mapFromItem(item, 0, 0), QPointF(0, 0))
            dx = line.dx()
            dy = line.dy()
            l = 2.0 * (dx * dx + dy * dy)
            if l > 0:
                xvel += (dx * 150.0) / l
                yvel += (dy * 150.0) / l

        # Now subtract all forces pulling items together.
        weight = (len(self.edgeList) + 1) * 10.0
        for edge in self.edgeList:
            if edge.sourceNode() is self:
                pos = self.mapFromItem(edge.destNode(), 0, 0)
            else:
                pos = self.mapFromItem(edge.sourceNode(), 0, 0)
            xvel += pos.x() / weight
            yvel += pos.y() / weight
    
        if qAbs(xvel) < 0.1 and qAbs(yvel) < 0.1:
            xvel = yvel = 0.0

        sceneRect = self.scene().sceneRect()
        self.newPos = self.pos() + QPointF(xvel, yvel)
        self.newPos.setX(min(max(self.newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10))
        self.newPos.setY(min(max(self.newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10))