RectangularGlow QML Type

Generates a blurred and colorized rectangle, which gives the impression that the source is glowing. 更多...

import 语句：	import QtGraphicalEffects 1.12
Since:	QtGraphicalEffects 1.0
继承：	Item

所有成员列表，包括继承成员

特性

cached : bool
color : color
cornerRadius : real
glowRadius : real
spread : real

详细描述

This effect is intended to have good performance. The shape of the glow is limited to a rectangle with a custom corner radius. For situations where custom shapes are required, consider Glow 效果。

Effect applied

注意： This effect is available when running with OpenGL.

范例

The following example shows how to apply the effect.

import QtQuick 2.12
import QtGraphicalEffects 1.12
Item {
    width: 300
    height: 300
    Rectangle {
        id: background
        anchors.fill: parent
        color: "black"
    }
    RectangularGlow {
        id: effect
        anchors.fill: rect
        glowRadius: 10
        spread: 0.2
        color: "white"
        cornerRadius: rect.radius + glowRadius
    }
    Rectangle {
        id: rect
        color: "black"
        anchors.centerIn: parent
        width: Math.round(parent.width / 1.5)
        height: Math.round(parent.height / 2)
        radius: 25
    }
}

特性文档编制

cached : bool

This property allows the effect output pixels to be cached in order to improve the rendering performance.

Every time the source or effect properties are changed, the pixels in the cache must be updated. Memory consumption is increased, because an extra buffer of memory is required for storing the effect output.

It is recommended to disable the cache when the source or the effect properties are animated.

By default, the property is set to false .

color : color

This property defines the RGBA color value which is used for the glow.

By default, the property is set to "white" .

Output examples with different color values

color: #ffffff	color: #55ff55	color: #5555ff
glowRadius : 20	glowRadius : 20	glowRadius : 20
spread : 0	spread : 0	spread : 0
cornerRadius : 25	cornerRadius : 25	cornerRadius : 25

cornerRadius : real

This property defines the corner radius that is used to draw a glow with rounded corners.

The value ranges from 0.0 to half of the effective width or height of the glow, whichever is smaller. This can be calculated with: min(width, height) / 2.0 + glowRadius

By default, the property is bound to glowRadius property. The glow behaves as if the rectangle was blurred when adjusting the glowRadius 特性。

Output examples with different cornerRadius values

cornerRadius: 0	cornerRadius: 25	cornerRadius: 50
glowRadius : 20	glowRadius : 20	glowRadius : 20
spread : 0	spread : 0	spread : 0
color : #ffffff	color : #ffffff	color : #ffffff

glowRadius : real

This property defines how many pixels outside the item area are reached by the glow.

The value ranges from 0.0 (no glow) to inf (infinite glow). By default, the property is set to 0.0 .

Output examples with different glowRadius values

glowRadius: 10	glowRadius: 20	glowRadius: 40
spread : 0	spread : 0	spread : 0
color : #ffffff	color : #ffffff	color : #ffffff
cornerRadius : 25	cornerRadius : 25	cornerRadius : 25

spread : real

This property defines how large part of the glow color is strengthened near the source edges.

The value ranges from 0.0 (no strength increase) to 1.0 (maximum strength increase). By default, the property is set to 0.0 .

Output examples with different spread values

spread: 0.0	spread: 0.5	spread: 1.0
glowRadius : 20	glowRadius : 20	glowRadius : 20
color : #ffffff	color : #ffffff	color : #ffffff
cornerRadius : 25	cornerRadius : 25	cornerRadius : 25