RectangularGlow QML Type

The following example shows how to apply the effect.

import QtQuick
import Qt5Compat.GraphicalEffects

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
    }
}

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.

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

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: 20	glowRadius: 20	glowRadius: 20
spread: 0	spread: 0	spread: 0
color: #ffffff	color: #ffffff	color: #ffffff

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

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