RectangularGlow QML Type

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

Import Statement: import QtGraphicalEffects 1.0
Since: QtGraphicalEffects 1.0
Inherits:

Item

Properties

Detailed Description

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 effect.

Effect applied

Note: This effect is available when running with OpenGL.

Example

The following example shows how to apply the effect.

import QtQuick 2.0
import QtGraphicalEffects 1.0

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
    }
}

Property Documentation

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: 20glowRadius: 20glowRadius: 20
spread: 0spread: 0spread: 0
cornerRadius: 25cornerRadius: 25cornerRadius: 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 property.

Output examples with different cornerRadius values

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

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