QPolygonF 類提供使用浮點精度的點列錶。 更多...
| 頭： |
#include <QPolygonF>
|
| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Gui)
target_link_libraries(mytarget PRIVATE Qt6::Gui)
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| qmake: |
QT += gui
|
| 繼承： | QList |
注意： 此類的所有函數 可重入 .
| QPolygonF () | |
| QPolygonF (const QList<QPointF> & points ) | |
| QPolygonF (const QPolygon & polygon ) | |
| QPolygonF (const QRectF & rectangle ) | |
| QRectF | boundingRect () const |
| bool | containsPoint (const QPointF & point , Qt::FillRule fillRule ) const |
| QPolygonF | intersected (const QPolygonF & r ) const |
| bool | intersects (const QPolygonF & p ) 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 |
| QVariant | operator QVariant () const |
| QDataStream & | operator<< (QDataStream & stream , const QPolygonF & polygon ) |
| QDataStream & | operator>> (QDataStream & stream , QPolygonF & polygon ) |
A QPolygonF is a QList < 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 QList , QPolygonF provides the boundingRect () 和 translate () functions for geometry operations. Use the QTransform::map () function for more general transformations of QPolygonFs.
QPolygonF also provides the 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.
The QPolygonF class is 隱式共享 .
另請參閱 QList , QPolygon ，和 QLineF .
[constexpr noexcept]
QPolygonF::
QPolygonF
()
Constructs a polygon with no points.
另請參閱 QList::isEmpty ().
Constructs a polygon containing the specified points .
Constructs a float based polygon from the specified integer based polygon .
另請參閱 toPolygon ().
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.
另請參閱 isClosed ().
Returns the bounding rectangle of the polygon, or QRectF (0,0,0,0) if the polygon is empty.
另請參閱 QList::isEmpty ().
返迴
true
若給定
point
is inside the polygon according to the specified
fillRule
；否則返迴
false
.
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.
另請參閱 intersects ().
返迴
true
if the current polygon intersects at any point the given polygon
p
。也返迴
true
if the current polygon contains or is contained by any part of
p
.
Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.
另請參閱 intersected ().
返迴
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.
另請參閱 QList::first () 和 QList::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.
Swaps this polygon with other 。此操作很快且從不失敗。
創建並返迴 QPolygon by converting each QPointF 到 QPoint .
另請參閱 QPointF::toPoint ().
Translate all points in the polygon by the given offset .
另請參閱 translated ().
Translates all points in the polygon by ( dx , dy ).
這是重載函數。
另請參閱 translated ().
Returns a copy of the polygon that is translated by the given offset .
另請參閱 translate ().
Returns a copy of the polygon that is translated by ( dx , dy ).
這是重載函數。
另請參閱 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.
另請參閱 intersected () 和 subtracted ().
Returns the polygon as a QVariant .
寫入給定 polygon 到給定 stream ，並返迴流引用。
另請參閱 序列化 Qt 數據類型 .
Reads a polygon from the given stream 進給定 polygon ，並返迴流引用。
另請參閱 序列化 Qt 數據類型 .