QGraphicsEllipseItem ¶

概要 ¶

详细描述 ¶

QGraphicsEllipseItem respresents an ellipse with a fill and an outline, and you can also use it for ellipse segments (see startAngle() , spanAngle() ).

To set the item’s ellipse, pass a QRectF to QGraphicsEllipseItem ‘s constructor, or call setRect() 。 rect() function returns the current ellipse geometry.

QGraphicsEllipseItem uses the rect and the pen width to provide a reasonable implementation of boundingRect() , shape() ，和 contains() 。 paint() function draws the ellipse using the item’s associated pen and brush, which you can set by calling setPen() and setBrush() .

另请参阅

QGraphicsPathItem QGraphicsRectItem QGraphicsPolygonItem QGraphicsTextItem QGraphicsLineItem QGraphicsPixmapItem 图形视图框架

class QGraphicsEllipseItem ( [ parent=None ] ) ¶

QGraphicsEllipseItem(rect[, parent=None])

QGraphicsEllipseItem(x, y, w, h[, parent=None])

param w

qreal

param parent

QGraphicsItem

param x

qreal

param y

qreal

param h

qreal

param rect

QRectF

构造 QGraphicsEllipseItem . parent 会被传递给 QAbstractGraphicsShapeItem ‘s constructor.

另请参阅

addItem()

构造 QGraphicsEllipseItem 使用 rect as the default rectangle. parent 会被传递给 QAbstractGraphicsShapeItem ‘s constructor.

另请参阅

addItem()

构造 QGraphicsEllipseItem using the rectangle defined by ( x , y ) and the given width and height , as the default rectangle. parent 会被传递给 QAbstractGraphicsShapeItem ‘s constructor.

另请参阅

addItem()

PySide2.QtWidgets.QGraphicsEllipseItem. rect ( ) ¶

返回类型

QRectF

Returns the item’s ellipse geometry as a QRectF .

另请参阅

setRect() drawEllipse()

PySide2.QtWidgets.QGraphicsEllipseItem. setRect ( rect ) ¶

参数

rect – QRectF

Sets the item’s ellipse geometry to rect . The rectangle’s left edge defines the left edge of the ellipse, and the rectangle’s top edge describes the top of the ellipse. The height and width of the rectangle describe the height and width of the ellipse.

另请参阅

rect() drawEllipse()

PySide2.QtWidgets.QGraphicsEllipseItem. setRect ( x , y , w , h ) ¶

参数

• x – qreal

• y – qreal

• w – qreal

• h – qreal

PySide2.QtWidgets.QGraphicsEllipseItem. setSpanAngle ( angle ) ¶

参数

angle – int

Sets the span angle for an ellipse segment to angle , which is in 16ths of a degree. This angle is used together with startAngle() to represent an ellipse segment (a pie). By default, the span angle is 5760 (360 * 16, a full ellipse).

另请参阅

spanAngle() setStartAngle() drawPie()

PySide2.QtWidgets.QGraphicsEllipseItem. setStartAngle ( angle ) ¶

参数

angle – int

Sets the start angle for an ellipse segment to angle , which is in 16ths of a degree. This angle is used together with spanAngle() for representing an ellipse segment (a pie). By default, the start angle is 0.

另请参阅

startAngle() setSpanAngle() drawPie()

PySide2.QtWidgets.QGraphicsEllipseItem. spanAngle ( ) ¶

返回类型

int

Returns the span angle of an ellipse segment in 16ths of a degree. This angle is used together with startAngle() for representing an ellipse segment (a pie). By default, this function returns 5760 (360 * 16, a full ellipse).

另请参阅

setSpanAngle() startAngle()

PySide2.QtWidgets.QGraphicsEllipseItem. startAngle ( ) ¶

返回类型

int

Returns the start angle for an ellipse segment in 16ths of a degree. This angle is used together with spanAngle() for representing an ellipse segment (a pie). By default, the start angle is 0.

另请参阅

setStartAngle() spanAngle()