The QPolygonF class provides a vector of points using floating point precision. 更多...
| 头： | #include <QPolygonF> |
| qmake: | QT += gui |
| 继承： | QVector |
注意： 此类的所有函数 可重入 .
| QPolygonF () | |
| QPolygonF (int size ) | |
| QPolygonF (const QVector<QPointF> & points ) | |
| QPolygonF (QVector<QPointF> && v ) | |
| QPolygonF (const QRectF & rectangle ) | |
| QPolygonF (const QPolygon & polygon ) | |
| QPolygonF (const QPolygonF & polygon ) | |
| QPolygonF (QPolygonF && other ) | |
| ~QPolygonF () | |
| QRectF | boundingRect () const |
| bool | containsPoint (const QPointF & point , Qt::FillRule fillRule ) const |
| QPolygonF | intersected (const QPolygonF & r ) const |
| bool | isClosed () const |
| QPolygonF | subtracted (const QPolygonF & r ) const |
| void | swap (QPolygonF & other ) |
| QPolygon | toPolygon () const |
| void | translate (const QPointF & offset ) |
| void | translate (qreal dx , qreal dy ) |
| QPolygonF | translated (const QPointF & offset ) const |
| QPolygonF | translated (qreal dx , qreal dy ) const |
| QPolygonF | united (const QPolygonF & r ) const |
| operator QVariant () const | |
| QPolygonF & | operator= (QPolygonF && other ) |
| QPolygonF & | operator= (const QPolygonF & other ) |
| QDataStream & | operator<< (QDataStream & stream , const QPolygonF & polygon ) |
| QDataStream & | operator>> (QDataStream & stream , QPolygonF & polygon ) |
The QPolygonF class provides a vector of points using floating point precision.
A QPolygonF 是 QVector < QPointF >. The easiest way to add points to a QPolygonF is to use its streaming operator, as illustrated below:
QPolygonF polygon;
polygon << QPointF(10.4, 20.5) << QPointF(20.2, 30.2);
In addition to the functions provided by QVector , QPolygonF 提供 boundingRect () 和 translate () functions for geometry operations. Use the QMatrix::map () function for more general transformations of QPolygonFs.
QPolygonF 还提供 isClosed () function to determine whether a polygon's start and end points are the same, and the toPolygon () function returning an integer precision copy of this polygon.
另请参阅 QVector , QPolygon ，和 QLineF .
Constructs a polygon with no points.
另请参阅 QVector::isEmpty ().
Constructs a polygon of the given size . Creates an empty polygon if size == 0.
另请参阅 QVector::isEmpty ().
Constructs a polygon containing the specified points .
Default constructs an instance of QPolygonF.
Constructs a closed polygon from the specified rectangle .
The polygon contains the four vertices of the rectangle in clockwise order starting and ending with the top-left vertex.
另请参阅 isClosed ().
Constructs a float based polygon from the specified integer based polygon .
另请参阅 toPolygon ().
构造副本为给定 polygon .
移动拷贝构造函数。
Destroys the polygon.
Returns the bounding rectangle of the polygon, or QRectF (0,0,0,0) if the polygon is empty.
另请参阅 QVector::isEmpty ().
返回
true
若给定
point
is inside the polygon according to the specified
fillRule
；否则返回
false
.
该函数在 Qt 4.3 引入。
Returns a polygon which is the intersection of this polygon and r .
Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.
该函数在 Qt 4.3 引入。
返回
true
if the polygon is closed; otherwise returns
false
.
A polygon is said to be closed if its start point and end point are equal.
另请参阅 QVector::first () 和 QVector::last ().
Returns a polygon which is r subtracted from this polygon.
Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.
该函数在 Qt 4.3 引入。
Swaps polygon other with this polygon. This operation is very fast and never fails.
该函数在 Qt 4.8 引入。
创建并返回 QPolygon by converting each QPointF 到 QPoint .
另请参阅 QPointF::toPoint ().
Translate all points in the polygon by the given offset .
另请参阅 translated ().
这是重载函数。
Translates all points in the polygon by ( dx , dy ).
另请参阅 translated ().
Returns a copy of the polygon that is translated by the given offset .
该函数在 Qt 4.6 引入。
另请参阅 translate ().
这是重载函数。
Returns a copy of the polygon that is translated by ( dx , dy ).
该函数在 Qt 4.6 引入。
另请参阅 translate ().
Returns a polygon which is the union of this polygon and r .
Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.
该函数在 Qt 4.3 引入。
另请参阅 intersected () 和 subtracted ().
Returns the polygon as a QVariant .
移动赋值运算符。
拷贝赋值运算符。
写入给定 polygon 到给定 stream ，并返回流引用。
另请参阅 序列化 Qt 数据类型 .
Reads a polygon from the given stream 进给定 polygon ，并返回流引用。
另请参阅 序列化 Qt 数据类型 .