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| |
| import QtQuick 2.12 |
| import QtGraphicalEffects.private 1.12 |
| |
| /*! |
| \qmltype ConicalGradient |
| \inqmlmodule QtGraphicalEffects |
| \since QtGraphicalEffects 1.0 |
| \inherits QtQuick2::Item |
| \ingroup qtgraphicaleffects-gradient |
| \brief Draws a conical gradient. |
| |
| A gradient is defined by two or more colors, which are blended seamlessly. |
| The colors start from the specified angle and end at 360 degrees larger |
| angle value. |
| |
| \table |
| \header |
| \li Effect applied |
| \row |
| \li \image ConicalGradient.png |
| \endtable |
| |
| \note This effect is available when running with OpenGL. |
| |
| \section1 Example |
| |
| The following example shows how to apply the effect. |
| \snippet ConicalGradient-example.qml example |
| |
| */ |
| Item { |
| id: rootItem |
| |
| /*! |
| 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 starting angle where the color at the gradient |
| position of 0.0 is rendered. Colors at larger position values are |
| rendered into larger angle values and blended seamlessly. Angle values |
| increase clockwise. |
| |
| \table |
| \header |
| \li Output examples with different angle values |
| \li |
| \li |
| \row |
| \li \image ConicalGradient_angle1.png |
| \li \image ConicalGradient_angle2.png |
| \li \image ConicalGradient_angle3.png |
| \row |
| \li \b { angle: 0 } |
| \li \b { angle: 45 } |
| \li \b { angle: 185 } |
| \row |
| \li \l horizontalOffset: 0 |
| \li \l horizontalOffset: 0 |
| \li \l horizontalOffset: 0 |
| \row |
| \li \l verticalOffset: 0 |
| \li \l verticalOffset: 0 |
| \li \l verticalOffset: 0 |
| \endtable |
| |
| */ |
| property real angle: 0.0 |
| |
| /*! |
| \qmlproperty real QtGraphicalEffects::ConicalGradient::horizontalOffset |
| \qmlproperty real QtGraphicalEffects::ConicalGradient::verticalOffset |
| |
| The horizontalOffset and verticalOffset properties define the offset in |
| pixels for the center point of the gradient compared to the item center. |
| |
| The value ranges from -inf to inf. By default, the properties are set to \c |
| 0. |
| |
| \table |
| \header |
| \li Output examples with different horizontalOffset values |
| \li |
| \li |
| \row |
| \li \image ConicalGradient_horizontalOffset1.png |
| \li \image ConicalGradient_horizontalOffset2.png |
| \li \image ConicalGradient_horizontalOffset3.png |
| \row |
| \li \b { horizontalOffset: -50 } |
| \li \b { horizontalOffset: 0 } |
| \li \b { horizontalOffset: 50 } |
| \row |
| \li \l angle: 0 |
| \li \l angle: 0 |
| \li \l angle: 0 |
| \row |
| \li \l verticalOffset: 0 |
| \li \l verticalOffset: 0 |
| \li \l verticalOffset: 0 |
| \endtable |
| */ |
| property real horizontalOffset: 0.0 |
| property real verticalOffset: 0.0 |
| |
| /*! |
| 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 |
| \row |
| \li \image ConicalGradient_maskSource1.png |
| \li \image ConicalGradient_maskSource2.png |
| \row |
| \li \b { source: undefined } |
| \li \b { source: } |
| \row |
| \li \l angle: 0 |
| \li \l angle: 0 |
| \row |
| \li \l horizontalOffset: 0 |
| \li \l horizontalOffset: 0 |
| \row |
| \li \l verticalOffset: 0 |
| \li \l verticalOffset: 0 |
| \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. |
| The color is defined by the color property. |
| |
| \table |
| \header |
| \li Output examples with different gradient values |
| \li |
| \li |
| \row |
| \li \image ConicalGradient_gradient1.png |
| \li \image ConicalGradient_gradient2.png |
| \li \image ConicalGradient_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 angle: 0 |
| \li \l angle: 0 |
| \li \l angle: 0 |
| \row |
| \li \l horizontalOffset: 0 |
| \li \l horizontalOffset: 0 |
| \li \l horizontalOffset: 0 |
| \row |
| \li \l verticalOffset: 0 |
| \li \l verticalOffset: 0 |
| \li \l verticalOffset: 0 |
| \endtable |
| |
| */ |
| property Gradient gradient: Gradient { |
| GradientStop { position: 0.0; color: "white" } |
| GradientStop { position: 1.0; color: "black" } |
| } |
| |
| SourceProxy { |
| id: maskSourceProxy |
| input: rootItem.source |
| } |
| |
| Rectangle { |
| id: gradientRect |
| width: 16 |
| height: 256 |
| gradient: rootItem.gradient |
| smooth: true |
| } |
| |
| ShaderEffectSource { |
| id: cacheItem |
| anchors.fill: parent |
| visible: rootItem.cached |
| smooth: true |
| rotation: shaderItem.rotation |
| sourceItem: shaderItem |
| live: true |
| hideSource: visible |
| } |
| |
| ShaderEffect { |
| id: shaderItem |
| property variant gradientSource: ShaderEffectSource { |
| sourceItem: gradientRect |
| smooth: true |
| hideSource: true |
| visible: false |
| } |
| property variant maskSource: maskSourceProxy.output |
| property real startAngle: (rootItem.angle - 90) * Math.PI/180 |
| property variant center: Qt.point(0.5 + horizontalOffset / width, 0.5 + verticalOffset / height) |
| |
| anchors.fill: parent |
| |
| fragmentShader: maskSource == undefined ? noMaskShader : maskShader |
| |
| onFragmentShaderChanged: startAngleChanged() |
| |
| property string noMaskShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/conicalgradient_nomask.frag" |
| property string maskShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/conicalgradient_mask.frag" |
| } |
| } |