# QConicalGradient Class Reference
## [[QtGui](index.htm) module]
该QConicalGradient类是用来与组合[QBrush](qbrush.html)指定一个锥形渐变画笔。[More...](#details)
继承[QGradient](qgradient.html)。
### Methods
* `__init__ (self)`
* `__init__ (self, QPointF center, float startAngle)`
* `__init__ (self, float cx, float cy, float startAngle)`
* `__init__ (self, QConicalGradient)`
* `float angle (self)`
* `QPointF center (self)`
* `setAngle (self, float angle)`
* `setCenter (self, QPointF center)`
* `setCenter (self, float x, float y)`
* * *
## Detailed Description
该QConicalGradient类是用来与组合[QBrush](qbrush.html)指定一个锥形渐变画笔。
锥形渐变插值围绕中心点插值颜色逆时针旋转。
![](https://img.kancloud.cn/3a/36/3a363d31685bf04367b478b824e4a16a_501x296.png)
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QConicalGradient类提供了[angle](qconicalgradient.html#angle)()和[center](qconicalgradient.html#center)( )函数返回渐变的起始角度和中心。
注意,这个[setSpread](qgradient.html#setSpread)()函数具有锥形梯度没有影响。其原因是,在锥形梯度通过定义封闭的,即圆锥渐变填充从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。
* * *
## Method Documentation
```
QConicalGradient.__init__ (self)
```
构造一个带有圆锥形中心( 0 , 0 )开始的插补角度0 。
**See also** [QGradient.setColorAt](qgradient.html#setColorAt)( )[setCenter](qconicalgradient.html#setCenter)()和[setAngle](qconicalgradient.html#setAngle)( ) 。
```
QConicalGradient.__init__ (self, QPointF center, float startAngle)
```
构造一个锥形渐变与给定_center_,在开始内插在给定的_angle_。该_angle_必须以度为0和360之间进行指定。
**See also** [QGradient.setColorAt](qgradient.html#setColorAt)()和[QGradient.setStops](qgradient.html#setStops)( ) 。
```
QConicalGradient.__init__ (self, float cx, float cy, float startAngle)
```
构造一个锥形渐变与给定中心(_cx_,_cy_),从内插在给定的_angle_。角度必须以度为0和360之间进行指定。
**See also** [QGradient.setColorAt](qgradient.html#setColorAt)()和[QGradient.setStops](qgradient.html#setStops)( ) 。
```
QConicalGradient.__init__ (self, QConicalGradient)
```
```
float QConicalGradient.angle (self)
```
返回锥形梯度逻辑坐标的起始角度。
**See also** [setAngle](qconicalgradient.html#setAngle)()和[stops](qgradient.html#stops)( ) 。
```
QPointF QConicalGradient.center (self)
```
[
返回锥形渐变的逻辑坐标的中心。
](qpointf.html)
[**See also**](qpointf.html) [setCenter](qconicalgradient.html#setCenter)()和[stops](qgradient.html#stops)( ) 。
```
QConicalGradient.setAngle (self, float angle)
```
Sets _angle_作此锥形梯度逻辑坐标的起始角度。
这个函数中引入了Qt 4.2中。
**See also** [angle](qconicalgradient.html#angle)( ) 。
```
QConicalGradient.setCenter (self, QPointF center)
```
设置此锥形渐变的逻辑坐标的中心,_center_。
**See also** [center](qconicalgradient.html#center)( ) 。
```
QConicalGradient.setCenter (self, float x, float y)
```
这是一个重载函数。
设置此锥形渐变的逻辑坐标的中心(_x_,_y_) 。
**See also** [center](qconicalgradient.html#center)( ) 。
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