如何在 QML 中使用透明矩形隐藏图像?
How to hide an image using transparent rectangle in QML?
在下面的代码中,我想使用透明矩形隐藏图像。请给我一些解决方案。我使用了 z 值,但它不起作用。图像仍然可见。
main.qml
import QtQuick 2.5
import QtQuick.Window 2.2
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Image
{
id:underlyingImage
width: 400
height: 400
x:0;
y:0;
source:"qrc:/Jellyfish.jpg"
z:1
}
Rectangle
{
id:hiding_rect
width: 400
height: 400
x:0;
y:0;
color:"transparent"
z:100
}
}
您可以使用 OpacityMask 来实现您的尝试,在下面的示例中我们隐藏了图像的一个象限。
import QtQuick 2.5
import QtQuick.Window 2.2
import QtGraphicalEffects 1.0
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Image
{
id:underlyingImage
width: 400
height: 400
fillMode: Image.PreserveAspectCrop
layer.enabled: true
layer.effect: OpacityMask {
maskSource: hiding_rect
}
source:"qrc:/Jellyfish.jpg"
}
Rectangle
{
id:hiding_rect
width: underlyingImage.width/2
height: underlyingImage.height/2
}
}
还有另一种使用方法OpacityMask,但是你的Qt版本应该>=5.7。
import QtQuick 2.0
import QtQuick.Window 2.0
import QtGraphicalEffects 1.0
Window {
width: 1280
height: 800
visible: true
Rectangle {
id: background
anchors.fill: parent
color: "black"
}
Image {
id: underlyingImage
width: 1204
height: 682
visible: false
source: "qrc:/timg.jpg"
}
Item {
id: hidingRect
anchors.fill: underlyingImage
visible: false
Rectangle {
width: underlyingImage.width / 2
height: underlyingImage.height / 2
color: "yellow"
}
}
OpacityMask {
anchors.fill: underlyingImage
source: underlyingImage
maskSource: hidingRect
invert: true
}
}
The result
在下面的代码中,我想使用透明矩形隐藏图像。请给我一些解决方案。我使用了 z 值,但它不起作用。图像仍然可见。
main.qml
import QtQuick 2.5
import QtQuick.Window 2.2
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Image
{
id:underlyingImage
width: 400
height: 400
x:0;
y:0;
source:"qrc:/Jellyfish.jpg"
z:1
}
Rectangle
{
id:hiding_rect
width: 400
height: 400
x:0;
y:0;
color:"transparent"
z:100
}
}
您可以使用 OpacityMask 来实现您的尝试,在下面的示例中我们隐藏了图像的一个象限。
import QtQuick 2.5
import QtQuick.Window 2.2
import QtGraphicalEffects 1.0
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Image
{
id:underlyingImage
width: 400
height: 400
fillMode: Image.PreserveAspectCrop
layer.enabled: true
layer.effect: OpacityMask {
maskSource: hiding_rect
}
source:"qrc:/Jellyfish.jpg"
}
Rectangle
{
id:hiding_rect
width: underlyingImage.width/2
height: underlyingImage.height/2
}
}
还有另一种使用方法OpacityMask,但是你的Qt版本应该>=5.7。
import QtQuick 2.0
import QtQuick.Window 2.0
import QtGraphicalEffects 1.0
Window {
width: 1280
height: 800
visible: true
Rectangle {
id: background
anchors.fill: parent
color: "black"
}
Image {
id: underlyingImage
width: 1204
height: 682
visible: false
source: "qrc:/timg.jpg"
}
Item {
id: hidingRect
anchors.fill: underlyingImage
visible: false
Rectangle {
width: underlyingImage.width / 2
height: underlyingImage.height / 2
color: "yellow"
}
}
OpacityMask {
anchors.fill: underlyingImage
source: underlyingImage
maskSource: hidingRect
invert: true
}
}
The result