# QRadialGradient Class Reference
## [[QtGui](index.htm) module]
该QRadialGradient类是用来与组合[QBrush](qbrush.html)指定一个径向渐变画笔。[More...](#details)
继承[QGradient](qgradient.html)。
### Methods
* `__init__ (self)`
* `__init__ (self, QPointF center, float radius, QPointF focalPoint)`
* `__init__ (self, QPointF center, float centerRadius, QPointF focalPoint, float focalRadius)`
* `__init__ (self, QPointF center, float radius)`
* `__init__ (self, float cx, float cy, float radius, float fx, float fy)`
* `__init__ (self, float cx, float cy, float centerRadius, float fx, float fy, float focalRadius)`
* `__init__ (self, float cx, float cy, float radius)`
* `__init__ (self, QRadialGradient)`
* `QPointF center (self)`
* `float centerRadius (self)`
* `QPointF focalPoint (self)`
* `float focalRadius (self)`
* `float radius (self)`
* `setCenter (self, QPointF center)`
* `setCenter (self, float x, float y)`
* `setCenterRadius (self, float radius)`
* `setFocalPoint (self, QPointF focalPoint)`
* `setFocalPoint (self, float x, float y)`
* `setFocalRadius (self, float radius)`
* `setRadius (self, float radius)`
* * *
## Detailed Description
该QRadialGradient类是用来与组合[QBrush](qbrush.html)指定一个径向渐变画笔。
Qt支持简单的和扩展的径向渐变。
简单的径向渐变在它周围一个圆圈一个联络点和结束点之间进行插值的色彩。扩展的径向渐变的焦点圆和圆心之间进行插值的色彩。点由两个圆限定的锥形外面将是透明的。对于简单的径向渐变的焦点调整到趴在中心圆内，而焦点可以在一个扩展的径向渐变的任何位置。
外底点的梯度可以是填充，反射或重复这取决于当前设置的[spread](qgradient.html#Spread-enum)方法：
|  |  |  |
| [PadSpread](qgradient.html#Spread-enum) (default) | [ReflectSpread](qgradient.html#Spread-enum) | [RepeatSpread](qgradient.html#Spread-enum) |
在渐变中的颜色使用的停止点定义[QGradientStop](qgradient.html#QGradientStop-typedef)输入时，即位置和颜色。使用[QGradient.setColorAt](qgradient.html#setColorAt)（）或[QGradient.setStops](qgradient.html#setStops)（）函数定义的停止点。它是渐变的一整套停止点，描述如何渐变区域应填补。如果已指定没有停止点，黑色在0到白在1梯度使用。
除了从继承的功能[QGradient](qgradient.html)，该QRadialGradient类提供了[center](qradialgradient.html#center)（ ）[focalPoint](qradialgradient.html#focalPoint)（）和[radius](qradialgradient.html#radius)（ ）函数分别返回渐变的中心，焦点和半径。
* * *
## Method Documentation
```
QRadialGradient.__init__ (self)
```
构造一个简单的径向渐变的中心和焦点在（ 0 ， 0 ）为1的半径。
```
QRadialGradient.__init__ (self, QPointF center, float radius, QPointF focalPoint)
```
构造一个简单的径向渐变与给定_center_，_radius_和_focalPoint_。
**Note:**如果给定的焦点是由确定的圆形外_center_点_radius_，它会被重新调整到趴在圆上的一个点，它与线相交的_center_至_focalPoint_。
**See also** [QGradient.setColorAt](qgradient.html#setColorAt)（）和[QGradient.setStops](qgradient.html#setStops)（ ） 。
```
QRadialGradient.__init__ (self, QPointF center, float centerRadius, QPointF focalPoint, float focalRadius)
```
构造具有给定中心的一个简单的径向渐变（_cx_，_cy_） ，_radius_和焦点（_fx_，_fy_） 。
**Note:**如果给定的焦点是由该中心确定的圆（外_cx_，_cy_）和_radius_它会被重新调整到线从中心到焦点和圆之间的交点。
**See also** [QGradient.setColorAt](qgradient.html#setColorAt)（）和[QGradient.setStops](qgradient.html#setStops)（ ） 。
```
QRadialGradient.__init__ (self, QPointF center, float radius)
```
构造一个简单的径向渐变与给定_center_，_radius_而在圆心的焦点。
**See also** [QGradient.setColorAt](qgradient.html#setColorAt)（）和[QGradient.setStops](qgradient.html#setStops)（ ） 。
```
QRadialGradient.__init__ (self, float cx, float cy, float radius, float fx, float fy)
```
构建与中心简单的径向渐变在（_cx_，_cy_性）和指定_radius_。的聚焦点位于该圆的中心。
**See also** [QGradient.setColorAt](qgradient.html#setColorAt)（）和[QGradient.setStops](qgradient.html#setStops)（ ） 。
```
QRadialGradient.__init__ (self, float cx, float cy, float centerRadius, float fx, float fy, float focalRadius)
```
构造一个扩展的径向渐变与给定_center_，_centerRadius_，_focalPoint_和_focalRadius_。
此功能被引入Qt的4.8 。
```
QRadialGradient.__init__ (self, float cx, float cy, float radius)
```
构造一个扩展的径向渐变与给定中心（_cx_，_cy_） ，中心半径，_centerRadius_，焦点， （_fx_，_fy_） ，和焦半径_focalRadius_。
此功能被引入Qt的4.8 。
```
QRadialGradient.__init__ (self, QRadialGradient)
```
```
QPointF QRadialGradient.center (self)
```
[
返回此径向渐变的逻辑坐标的中心。
](qpointf.html)
[**See also**](qpointf.html) [setCenter](qradialgradient.html#setCenter)（）和[QGradient.stops](qgradient.html#stops)（ ） 。
```
float QRadialGradient.centerRadius (self)
```
返回逻辑坐标此径向渐变的中心半径。
此功能被引入Qt的4.8 。
**See also** [setCenterRadius](qradialgradient.html#setCenterRadius)（）和[QGradient.stops](qgradient.html#stops)（ ） 。
```
QPointF QRadialGradient.focalPoint (self)
```
[
返回逻辑坐标此径向渐变的焦点。
](qpointf.html)
[**See also**](qpointf.html) [setFocalPoint](qradialgradient.html#setFocalPoint)（）和[QGradient.stops](qgradient.html#stops)（ ） 。
```
float QRadialGradient.focalRadius (self)
```
返回逻辑坐标此径向渐变的焦点半径。
此功能被引入Qt的4.8 。
**See also** [setFocalRadius](qradialgradient.html#setFocalRadius)（）和[QGradient.stops](qgradient.html#stops)（ ） 。
```
float QRadialGradient.radius (self)
```
返回逻辑坐标此径向渐变的半径。
相当于[centerRadius](qradialgradient.html#centerRadius)（ ）
**See also** [setRadius](qradialgradient.html#setRadius)（）和[QGradient.stops](qgradient.html#stops)（ ） 。
```
QRadialGradient.setCenter (self, QPointF center)
```
这个设置径向渐变的逻辑坐标的中心，_center_。
这个函数中引入了Qt 4.2中。
**See also** [center](qradialgradient.html#center)（ ） 。
```
QRadialGradient.setCenter (self, float x, float y)
```
这是一个重载函数。
这个设置径向渐变的逻辑坐标的中心（_x_，_y_） 。
这个函数中引入了Qt 4.2中。
**See also** [center](qradialgradient.html#center)（ ） 。
```
QRadialGradient.setCenterRadius (self, float radius)
```
设置在逻辑坐标此径向渐变的中心半径_radius_
此功能被引入Qt的4.8 。
**See also** [centerRadius](qradialgradient.html#centerRadius)（ ） 。
```
QRadialGradient.setFocalPoint (self, QPointF focalPoint)
```
设置在逻辑坐标此径向渐变的焦点，以_focalPoint_。
这个函数中引入了Qt 4.2中。
**See also** [focalPoint](qradialgradient.html#focalPoint)（ ） 。
```
QRadialGradient.setFocalPoint (self, float x, float y)
```
这是一个重载函数。
设置在逻辑坐标此径向渐变的焦点为（_x_，_y_） 。
这个函数中引入了Qt 4.2中。
**See also** [focalPoint](qradialgradient.html#focalPoint)（ ） 。
```
QRadialGradient.setFocalRadius (self, float radius)
```
设置在逻辑坐标此径向渐变的焦点半径_radius_
此功能被引入Qt的4.8 。
**See also** [focalRadius](qradialgradient.html#focalRadius)（ ） 。
```
QRadialGradient.setRadius (self, float radius)
```
设置在逻辑坐标此径向渐变的半径_radius_
相当于[setCenterRadius](qradialgradient.html#setCenterRadius)（ ）
这个函数中引入了Qt 4.2中。
**See also** [radius](qradialgradient.html#radius)（ ） 。
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- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference