/usr/lib/x86_64-linux-gnu/qt5/qml/QtGraphicalEffects/LinearGradient.qml is in qml-module-qtgraphicaleffects 5.5.1-1ubuntu1.
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**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Graphical Effects module.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
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** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
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**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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****************************************************************************/
import QtQuick 2.0
import "private"
/*!
\qmltype LinearGradient
\inqmlmodule QtGraphicalEffects
\since QtGraphicalEffects 1.0
\inherits QtQuick2::Item
\ingroup qtgraphicaleffects-gradient
\brief Draws a linear gradient.
A gradient is defined by two or more colors, which are blended seamlessly.
The colors start from the given start point and end to the given end point.
\table
\header
\li Effect applied
\row
\li \image LinearGradient.png
\endtable
\section1 Example
The following example shows how to apply the effect.
\snippet LinearGradient-example.qml example
*/
Item {
id: rootItem
/*!
This property defines the starting point where the color at gradient
position of 0.0 is rendered. Colors at larger position values are
rendered linearly towards the end point. The point is given in pixels
and the default value is Qt.point(0, 0). Setting the default values for
the start and \l{LinearGradient::end}{end} results in a full height
linear gradient on the y-axis.
\table
\header
\li Output examples with different start values
\li
\li
\row
\li \image LinearGradient_start1.png
\li \image LinearGradient_start2.png
\li \image LinearGradient_start3.png
\row
\li \b { start: QPoint(0, 0) }
\li \b { start: QPoint(150, 150) }
\li \b { start: QPoint(300, 0) }
\row
\li \l end: QPoint(300, 300)
\li \l end: QPoint(300, 300)
\li \l end: QPoint(300, 300)
\endtable
*/
property variant start: Qt.point(0, 0)
/*!
This property defines the ending point where the color at gradient
position of 1.0 is rendered. Colors at smaller position values are
rendered linearly towards the start point. The point is given in pixels
and the default value is Qt.point(0, height). Setting the default values
for the \l{LinearGradient::start}{start} and end results in a full
height linear gradient on the y-axis.
\table
\header
\li Output examples with different end values
\li
\li
\row
\li \image LinearGradient_end1.png
\li \image LinearGradient_end2.png
\li \image LinearGradient_end3.png
\row
\li \b { end: Qt.point(300, 300) }
\li \b { end: Qt.point(150, 150) }
\li \b { end: Qt.point(300, 0) }
\row
\li \l start: Qt.point(0, 0)
\li \l start: Qt.point(0, 0)
\li \l start: Qt.point(0, 0)
\endtable
*/
property variant end: Qt.point(0, height)
/*!
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 \c false.
*/
property bool cached: false
/*!
This property defines the item that is going to be filled with gradient.
Source item gets rendered into an intermediate pixel buffer and the
alpha values from the result are used to determine the gradient's pixels
visibility in the display. The default value for source is undefined and
in that case whole effect area is filled with gradient.
\table
\header
\li Output examples with different source values
\li
\li
\row
\li \image LinearGradient_maskSource1.png
\li \image LinearGradient_maskSource2.png
\row
\li \b { source: undefined }
\li \b { source: Image { source: images/butterfly.png } }
\row
\li \l start: Qt.point(0, 0)
\li \l start: Qt.point(0, 0)
\row
\li \l end: Qt.point(300, 300)
\li \l end: Qt.point(300, 300)
\endtable
\note It is not supported to let the effect include itself, for
instance by setting source to the effect's parent.
*/
property variant source
/*!
A gradient is defined by two or more colors, which are blended
seamlessly. The colors are specified as a set of GradientStop child
items, each of which defines a position on the gradient from 0.0 to 1.0
and a color. The position of each GradientStop is defined by the
position property, and the color is definded by the color property.
\table
\header
\li Output examples with different gradient values
\li
\li
\row
\li \image LinearGradient_gradient1.png
\li \image LinearGradient_gradient2.png
\li \image LinearGradient_gradient3.png
\row
\li \b {gradient:} \code
Gradient {
GradientStop {
position: 0.000
color: Qt.rgba(1, 0, 0, 1)
}
GradientStop {
position: 0.167
color: Qt.rgba(1, 1, 0, 1)
}
GradientStop {
position: 0.333
color: Qt.rgba(0, 1, 0, 1)
}
GradientStop {
position: 0.500
color: Qt.rgba(0, 1, 1, 1)
}
GradientStop {
position: 0.667
color: Qt.rgba(0, 0, 1, 1)
}
GradientStop {
position: 0.833
color: Qt.rgba(1, 0, 1, 1)
}
GradientStop {
position: 1.000
color: Qt.rgba(1, 0, 0, 1)
}
}
\endcode
\li \b {gradient:} \code
Gradient {
GradientStop {
position: 0.0
color: "#F0F0F0"
}
GradientStop {
position: 0.5
color: "#000000"
}
GradientStop {
position: 1.0
color: "#F0F0F0"
}
}
\endcode
\li \b {gradient:} \code
Gradient {
GradientStop {
position: 0.0
color: "#00000000"
}
GradientStop {
position: 1.0
color: "#FF000000"
}
}
\endcode
\row
\li \l start: Qt.point(0, 0)
\li \l start: Qt.point(0, 0)
\li \l start: Qt.point(0, 0)
\row
\li \l end: Qt.point(300, 300)
\li \l end: Qt.point(300, 300)
\li \l end: Qt.point(300, 300)
\endtable
*/
property Gradient gradient: Gradient {
GradientStop { position: 0.0; color: "white" }
GradientStop { position: 1.0; color: "black" }
}
SourceProxy {
id: maskSourceProxy
input: rootItem.source
}
ShaderEffectSource {
id: gradientSource
sourceItem: Rectangle {
width: 16
height: 256
gradient: rootItem.gradient
smooth: true
}
smooth: true
hideSource: true
visible: false
}
ShaderEffectSource {
id: cacheItem
anchors.fill: parent
visible: rootItem.cached
smooth: true
sourceItem: shaderItem
live: true
hideSource: visible
}
ShaderEffect {
id: shaderItem
anchors.fill: parent
property variant source: gradientSource
property variant maskSource: maskSourceProxy.output
property variant startPoint: Qt.point(start.x / width, start.y / height)
property real dx: end.x - start.x
property real dy: end.y - start.y
property real l: 1.0 / Math.sqrt(Math.pow(dx / width, 2.0) + Math.pow(dy / height, 2.0))
property real angle: Math.atan2(dx, dy)
property variant matrixData: Qt.point(Math.sin(angle), Math.cos(angle))
vertexShader: "
attribute highp vec4 qt_Vertex;
attribute highp vec2 qt_MultiTexCoord0;
uniform highp mat4 qt_Matrix;
varying highp vec2 qt_TexCoord0;
varying highp vec2 qt_TexCoord1;
uniform highp vec2 startPoint;
uniform highp float l;
uniform highp vec2 matrixData;
void main() {
highp mat2 rot = mat2(matrixData.y, -matrixData.x,
matrixData.x, matrixData.y);
qt_TexCoord0 = qt_MultiTexCoord0;
qt_TexCoord1 = qt_MultiTexCoord0 * l;
qt_TexCoord1 -= startPoint * l;
qt_TexCoord1 *= rot;
gl_Position = qt_Matrix * qt_Vertex;
}
"
fragmentShader: maskSource == undefined ? noMaskShader : maskShader
onFragmentShaderChanged: lChanged()
property string maskShader: "
uniform lowp sampler2D source;
uniform lowp sampler2D maskSource;
uniform lowp float qt_Opacity;
varying highp vec2 qt_TexCoord0;
varying highp vec2 qt_TexCoord1;
void main() {
lowp vec4 gradientColor = texture2D(source, qt_TexCoord1);
lowp float maskAlpha = texture2D(maskSource, qt_TexCoord0).a;
gl_FragColor = gradientColor * maskAlpha * qt_Opacity;
}
"
property string noMaskShader: "
uniform lowp sampler2D source;
uniform lowp float qt_Opacity;
varying highp vec2 qt_TexCoord1;
void main() {
gl_FragColor = texture2D(source, qt_TexCoord1) * qt_Opacity;
}
"
}
}
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