QGraphicsLineItem ¶

概要 ¶

详细描述 ¶

To set the item’s line, pass a QLineF to QGraphicsLineItem ‘s constructor, or call the setLine() function. The line() function returns the current line. By default the line is black with a width of 0, but you can change this by calling setPen() .

QGraphicsLineItem uses the line and the pen width to provide a reasonable implementation of boundingRect() , shape() ，和 contains() 。 paint() function draws the line using the item’s associated pen.

另请参阅

QGraphicsPathItem QGraphicsRectItem QGraphicsEllipseItem QGraphicsTextItem QGraphicsPolygonItem QGraphicsPixmapItem 图形视图框架

class QGraphicsLineItem ( [ parent=None ] ) ¶

QGraphicsLineItem(line[, parent=None])

QGraphicsLineItem(x1, y1, x2, y2[, parent=None])

param parent

QGraphicsItem

param y1

qreal

param line

QLineF

param y2

qreal

param x1

qreal

param x2

qreal

构造 QGraphicsLineItem . parent 会被传递给 QGraphicsItem ‘s constructor.

另请参阅

addItem()

构造 QGraphicsLineItem ，使用 line 作为默认线条。 parent 会被传递给 QGraphicsItem ‘s constructor.

另请参阅

addItem()

构造 QGraphicsLineItem , using the line between ( x1 , y1 ) 和 ( x2 , y2 ) 作为默认线条。 parent 会被传递给 QGraphicsItem ‘s constructor.

另请参阅

addItem()

PySide2.QtWidgets.QGraphicsLineItem. line ( ) ¶

返回类型

QLineF

Returns the item’s line, or a null line if no line has been set.

另请参阅

setLine()

PySide2.QtWidgets.QGraphicsLineItem. pen ( ) ¶

返回类型

QPen

Returns the item’s pen, or a black solid 0-width pen if no pen has been set.

另请参阅

setPen()

PySide2.QtWidgets.QGraphicsLineItem. setLine ( line ) ¶

参数

line – QLineF

Sets the item’s line to be the given line .

另请参阅

line()

PySide2.QtWidgets.QGraphicsLineItem. setLine ( x1 , y1 , x2 , y2 ) ¶

参数

• x1 – qreal

• y1 – qreal

• x2 – qreal

• y2 – qreal

这是重载函数。

Sets the item’s line to be the line between ( x1 , y1 ) 和 ( x2 , y2 ).

这如同调用 setLine(QLineF(x1, y1, x2, y2)) .

PySide2.QtWidgets.QGraphicsLineItem. setPen ( pen ) ¶

参数

pen – QPen

Sets the item’s pen to pen 。若未设置钢笔，将使用黑色 0 宽度实心钢笔绘制线条。

另请参阅

pen()