Qt功能优化：Qt 3D画廊

Posted 2022-09-05 灵彧universe

Qt功能优化：Qt 3D画廊

@TOC

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一、效果图

如下图所示：

二、使用步骤

1. .pro部分

TEMPLATE = app

QT += qml quick
CONFIG += c++11

SOURCES += main.cpp

RESOURCES += qml.qrc \\
    image.qrc

# Additional import path used to resolve QML modules in Qt Creators code model
QML_IMPORT_PATH =

# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

# Default rules for deployment.
qnx: target.path = /tmp/$$TARGET/bin
else: unix:!android: target.path = /opt/$$TARGET/bin
!isEmpty(target.path): INSTALLS += target

2. .qml部分

Demo.qml

Rectangle
id:coverflow

property ListModel model
property int itemCount: 5

PathView
    id:pathView
    model:coverflow.model
    delegate: Item 
        id:delegateItem
        width: 530
        height: 420
        z:PathView.iconZ
        scale:PathView.iconScale

        Image
            id:image
            source: url
            width: delegateItem.width
            height: delegateItem.height
        
        ShaderEffect 
            anchors.top: image.bottom
            width: image.width
            height: image.height;
            anchors.left: image.left
            property variant source: image;
            property size sourceSize: Qt.size(0.5 / image.width, 0.5 / image.height);
            fragmentShader:
                    "varying highp vec2 qt_TexCoord0;
                    uniform lowp sampler2D source;
                    uniform lowp vec2 sourceSize;
                    uniform lowp float qt_Opacity;
                    void main() 

                        lowp vec2 tc = qt_TexCoord0 * vec2(1, -1) + vec2(0, 1);
                        lowp vec4 col = 0.25 * (texture2D(source, tc + sourceSize) + texture2D(source, tc- sourceSize)
                        + texture2D(source, tc + sourceSize * vec2(1, -1))
                        + texture2D(source, tc + sourceSize * vec2(-1, 1)));
                        gl_FragColor = col * qt_Opacity * (1.0 - qt_TexCoord0.y) * 0.2;
                    "
        

        transform: Rotation
            origin.x:image.width/2.0
            origin.y:image.height/2.0
            axisx:0;y:1;z:0
            angle: delegateItem.PathView.iconAngle
        
    
    path:coverFlowPath
    pathItemCount: coverflow.itemCount
    anchors.fill: parent

    preferredHighlightBegin: 0.5
    preferredHighlightEnd: 0.5



Path
    id:coverFlowPath
    startX: 0
    startY: coverflow.height/3

    PathAttributename:"iconZ";value: 0
    PathAttributename:"iconAngle";value: 70
    PathAttributename:"iconScale";value: 0.6
    PathLinex:coverflow.width/2;y:coverflow.height/3

    PathAttributename:"iconZ";value: 100
    PathAttributename:"iconAngle";value: 0
    PathAttributename:"iconScale";value: 1.0

    PathLinex:coverflow.width;y:coverflow.height/3
    PathAttributename:"iconZ";value: 0
    PathAttributename:"iconAngle";value: -70
    PathAttributename:"iconScale";value: 0.6
    PathPercentvalue:1.0

---

main.qml

>代码如下：

```c
import QtQuick 2.8
import QtQuick.Window 2.2

Window 
    visible: true
    width:1800
    height: 880
    title: qsTr("灵眸")

    ListModel
        id:model
        ListElementurl:"qrc:/image/1.png"
        ListElementurl:"qrc:/image/2.png"
        ListElementurl:"qrc:/image/3.png"
        ListElementurl:"qrc:/image/4.png"
        ListElementurl:"qrc:/image/6.png"
        ListElementurl:"qrc:/image/7.png"
        ListElementurl:"qrc:/image/8.png"
        ListElementurl:"qrc:/image/9.png"
        ListElementurl:"qrc:/image/10.png"
        ListElementurl:"qrc:/image/11.png"
        ListElementurl:"qrc:/image/12.png"
        ListElementurl:"qrc:/image/13.png"
        ListElementurl:"qrc:/image/14.png"

    

    CoverFlow
        anchors.fill:parent
        model:model
    

3. .cpp部分

main.cpp

int main(int argc, char *argv[])

QGuiApplication app(argc, argv);

QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
if (engine.rootObjects().isEmpty())
    return -1;

return app.exec();

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# 总结
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