# QGradient Class Reference
## [[QtGui](index.htm) module]
该QGradient类是用来与组合[QBrush](qbrush.html)指定渐变填充。[More...](#details)
通过继承[QConicalGradient](qconicalgradient.html)，[QLinearGradient](qlineargradient.html)和[QRadialGradient](qradialgradient.html)。
### Types
* `enum CoordinateMode { LogicalMode, StretchToDeviceMode, ObjectBoundingMode }`
* `enum Spread { PadSpread, ReflectSpread, RepeatSpread }`
* `enum Type { LinearGradient, RadialGradient, ConicalGradient, NoGradient }`
### Methods
* `__init__ (self)`
* `__init__ (self, QGradient)`
* `CoordinateMode coordinateMode (self)`
* `setColorAt (self, float pos, QColor color)`
* `setCoordinateMode (self, CoordinateMode mode)`
* `setSpread (self, Spread aspread)`
* `setStops (self, list-of-tuple-of-float-QColor stops)`
* `Spread spread (self)`
* `list-of-tuple-of-float-QColor stops (self)`
* `Type type (self)`
### Special Methods
* `bool __eq__ (self, QGradient gradient)`
* `bool __ne__ (self, QGradient other)`
* * *
## Detailed Description
该QGradient类是用来与组合[QBrush](qbrush.html)指定渐变填充。
目前的Qt支持三种类型的渐变填充的：
* _Linear_ gradients interpolate colors between start and end points.
* _Simple_ radial gradients interpolate colors between a focal point and end points on a circle surrounding it.
* _Extended_ radial gradients interpolate colors between a center and a focal circle.
* _Conical_ gradients interpolate colors around a center point.
渐变的类型可以使用被检索[type](qgradient.html#type)（）函数。每个类型的被QGradient的子类表示：
| [QLinearGradient](qlineargradient.html) | [QRadialGradient](qradialgradient.html) | [QConicalGradient](qconicalgradient.html) |
| --- | --- | --- |
|  |  |  |
在渐变中的颜色所使用的停止点定义[QGradientStop](qgradient.html#QGradientStop-typedef)型，即，位置和颜色。使用[setColorAt](qgradient.html#setColorAt)（ ）函数来定义一个停止点。或者，使用[setStops](qgradient.html#setStops)（ ）函数来一气呵成定义几个止损点。需要注意的是，后者的功能_replaces_当前设定的止损点。
它是渐变的一整套停止点（可通过[stops](qgradient.html#stops)（ ）函数） ，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。
从黑对角线线性梯度（ 100 ， 100） ，以白色为（ 200 ， 200 ）可以这样指定：
```
[QLinearGradient](qlineargradient.html) linearGrad([QPointF](qpointf.html)(100, 100), [QPointF](qpointf.html)(200, 200));
linearGrad.setColorAt(0, [Qt](qt.html).black);
linearGrad.setColorAt(1, [Qt](qt.html).white);
```
渐变可以有止损点的一个任意数字。下面将创建开始，红色在中心，蓝色和绿色，然后在边缘的径向渐变：
```
[QRadialGradient](qradialgradient.html) radialGrad([QPointF](qpointf.html)(100, 100), 100);
radialGrad.setColorAt(0, [Qt](qt.html).red);
radialGrad.setColorAt(0.5, [Qt](qt.html).blue);
radialGrad.setColorAt(1, [Qt](qt.html).green);
```
它可以借由指定其区域之外的重复或反映该梯度的[spread method](qgradient.html#Spread-enum)使用[setSpread](qgradient.html#setSpread)（）函数。缺省值是垫在最近停止点的颜色外区域。当前设置[spread method](qgradient.html#Spread-enum)可使用检索到的[spread](qgradient.html#spread)（）函数。该[QGradient.Spread](qgradient.html#Spread-enum)枚举定义了三种不同的方法：
|  |  |  |
| [PadSpread](qgradient.html#Spread-enum) | [RepeatSpread](qgradient.html#Spread-enum) | [ReflectSpread](qgradient.html#Spread-enum) |
注意，这个[setSpread](qgradient.html#setSpread)（）函数只具有线性和径向渐变效果。其原因是，在锥形梯度通过定义封闭的，即_conical_渐变填充从0整个圆 - 360度，而径向或线性梯度的边界可以通过它的半径或最终停止点，分别被指定。
梯度坐标可以在逻辑坐标，相对于设备坐标，或者相对于对象的边界框的坐标来指定。该[coordinate mode](qgradient.html#CoordinateMode-enum)可使用设置[setCoordinateMode](qgradient.html#setCoordinateMode)（）函数。默认值是[LogicalMode](qgradient.html#CoordinateMode-enum)，其中所述梯度的坐标以相同的方式作为对象坐标指定。要检索当前设置的[coordinate mode](qgradient.html#CoordinateMode-enum)使用[coordinateMode](qgradient.html#coordinateMode)（ ） 。
* * *
## Type Documentation
```
QGradient.CoordinateMode
```
此枚举指定如何渐变的坐标映射到其上的梯度可用于油漆设备。
| Constant | Value | Description |
| --- | --- | --- |
| `QGradient.LogicalMode` | `0` | 这是默认模式。渐变坐标指定的逻辑空间只是该对象的坐标等。 |
| `QGradient.StretchToDeviceMode` | `1` | 在这种模式下，渐变的坐标是相对于漆设备的边界矩形，与（ 0,0 ）在左上角，（1,1 ）中的绘图设备的右下角。 |
| `QGradient.ObjectBoundingMode` | `2` | 在这种模式下，梯度坐标是相对于被绘制的对象，用（ 0,0 ）在左上角，（1,1 ），在对象的边界矩形的右下角的边框。 |
这个枚举被引入或修改的Qt 4.4 。
```
QGradient.Spread
```
指定如何梯度范围之外的区域应该充满。
| Constant | Value | Description |
| --- | --- | --- |
| `QGradient.PadSpread` | `0` | 该地区充满了最近的车站颜色。这是默认的。 |
| `QGradient.RepeatSpread` | `2` | 梯度是重复的梯度区域之外。 |
| `QGradient.ReflectSpread` | `1` | 该梯度的梯度范围之外的反映。 |
**See also** [spread](qgradient.html#spread)（）和[setSpread](qgradient.html#setSpread)（ ） 。
```
QGradient.Type
```
指定渐变的类型。
| Constant | Value | Description |
| --- | --- | --- |
| `QGradient.LinearGradient` | `0` | 开始和结束点之间进行内插的色彩（[QLinearGradient](qlineargradient.html)） 。 |
| `QGradient.RadialGradient` | `1` | 插色焦点之间和结束它周围一圈点（[QRadialGradient](qradialgradient.html)） 。 |
| `QGradient.ConicalGradient` | `2` | 插围绕中心点的颜色（[QConicalGradient](qconicalgradient.html)） 。 |
| `QGradient.NoGradient` | `3` | 无梯度被使用。 |
**See also** [type](qgradient.html#type)（ ） 。
* * *
## Method Documentation
```
QGradient.__init__ (self)
```
```
QGradient.__init__ (self, QGradient)
```
```
CoordinateMode QGradient.coordinateMode (self)
```
[](qgradient.html#CoordinateMode-enum)
[返回此渐变的坐标模式。默认模式是](qgradient.html#CoordinateMode-enum)[LogicalMode](qgradient.html#CoordinateMode-enum)。
此功能被引入Qt的4.4 。
**See also** [setCoordinateMode](qgradient.html#setCoordinateMode)（ ） 。
```
QGradient.setColorAt (self, float pos, QColor color)
```
创建一个停止点在给定的_position_用给定的_color_。给定_position_必须是范围为0到1。
**See also** [setStops](qgradient.html#setStops)（）和[stops](qgradient.html#stops)（ ） 。
```
QGradient.setCoordinateMode (self, CoordinateMode mode)
```
这个渐变的坐标模式设置为_mode_。默认模式是[LogicalMode](qgradient.html#CoordinateMode-enum)。
此功能被引入Qt的4.4 。
**See also** [coordinateMode](qgradient.html#coordinateMode)（ ） 。
```
QGradient.setSpread (self, Spread aspread)
```
指定的蔓延_method_应该用于该梯度。
注意，该函数只具有线性和径向渐变效果。
**See also** [spread](qgradient.html#spread)（ ） 。
```
QGradient.setStops (self, list-of-tuple-of-float-QColor stops)
```
替换当前设置的止损点与给定_stopPoints_。该点的位置必须在0到1范围，并与最低点首先必须进行排序。
**See also** [setColorAt](qgradient.html#setColorAt)（）和[stops](qgradient.html#stops)（ ） 。
```
Spread QGradient.spread (self)
```
[](qgradient.html#Spread-enum)
[返回此梯度扩散方法的使用。默认值是](qgradient.html#Spread-enum)[PadSpread](qgradient.html#Spread-enum)。
**See also** [setSpread](qgradient.html#setSpread)（ ） 。
```
list-of-tuple-of-float-QColor QGradient.stops (self)
```
返回止损点，这个梯度。
如果已指定没有停止点，黑色在0到白在1梯度使用。
**See also** [setStops](qgradient.html#setStops)（）和[setColorAt](qgradient.html#setColorAt)（ ） 。
```
Type QGradient.type (self)
```
[
返回渐变的类型。
```
bool QGradient.__eq__ (self, QGradient gradient)
```
```
bool QGradient.__ne__ (self, QGradient other)
```
](qgradient.html#Type-enum)
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- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- 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