QML Advanced Tutorial 2

自己写的时候发现圆形背景不透明，

Rectangle {
    id: block
    //width: img.width; height: img.height

    Image {
        id: img
        anchors.fill: parent
        source: "../shared/pics/redStone.png"
    }
}

 

Rectangle 改为 Item就可以了：

Item {
    id: block
    //width: img.width; height: img.height

    Image {
        id: img
        anchors.fill: parent
        source: "../shared/pics/redStone.png"
    }
}