init
This commit is contained in:
Sven Riwoldt
@@ -0,0 +1,323 @@
|
||||
/****************************************************************************
|
||||
**
|
||||
** Copyright (C) 2017 The Qt Company Ltd.
|
||||
** Contact: https://www.qt.io/licensing/
|
||||
**
|
||||
** This file is part of the Qt Graphical Effects module.
|
||||
**
|
||||
** $QT_BEGIN_LICENSE:LGPL$
|
||||
** Commercial License Usage
|
||||
** Licensees holding valid commercial Qt licenses may use this file in
|
||||
** accordance with the commercial license agreement provided with the
|
||||
** Software or, alternatively, in accordance with the terms contained in
|
||||
** a written agreement between you and The Qt Company. For licensing terms
|
||||
** and conditions see https://www.qt.io/terms-conditions. For further
|
||||
** information use the contact form at https://www.qt.io/contact-us.
|
||||
**
|
||||
** GNU Lesser General Public License Usage
|
||||
** Alternatively, this file may be used under the terms of the GNU Lesser
|
||||
** General Public License version 3 as published by the Free Software
|
||||
** Foundation and appearing in the file LICENSE.LGPL3 included in the
|
||||
** packaging of this file. Please review the following information to
|
||||
** ensure the GNU Lesser General Public License version 3 requirements
|
||||
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
|
||||
**
|
||||
** GNU General Public License Usage
|
||||
** Alternatively, this file may be used under the terms of the GNU
|
||||
** General Public License version 2.0 or (at your option) the GNU General
|
||||
** Public license version 3 or any later version approved by the KDE Free
|
||||
** Qt Foundation. The licenses are as published by the Free Software
|
||||
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
|
||||
** included in the packaging of this file. Please review the following
|
||||
** information to ensure the GNU General Public License requirements will
|
||||
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
|
||||
** https://www.gnu.org/licenses/gpl-3.0.html.
|
||||
**
|
||||
** $QT_END_LICENSE$
|
||||
**
|
||||
****************************************************************************/
|
||||
|
||||
import QtQuick 2.12
|
||||
import QtGraphicalEffects.private 1.12
|
||||
|
||||
/*!
|
||||
\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
|
||||
|
||||
\note This effect is available when running with OpenGL.
|
||||
|
||||
\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: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/lineargradient.vert"
|
||||
|
||||
fragmentShader: maskSource == undefined ? noMaskShader : maskShader
|
||||
|
||||
onFragmentShaderChanged: lChanged()
|
||||
|
||||
property string maskShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/lineargradient_mask.frag"
|
||||
property string noMaskShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/lineargradient_nomask.frag"
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user