item2.qml Example File

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 import QtQuick 2.9
 import QtQuick.Shapes 1.0

 Rectangle {
     color: "lightGray"

     Shape {
         id: circ1
         anchors.fill: parent

         ShapePath {
             id: p1
             fillColor: "transparent" // stroke only
             strokeWidth: 4

             SequentialAnimation on strokeColor {
                 loops: Animation.Infinite
                 ColorAnimation {
                     from: "black"
                     to: "yellow"
                     duration: 5000
                 }
                 ColorAnimation {
                     from: "yellow"
                     to: "green"
                     duration: 5000
                 }
                 ColorAnimation {
                     from: "green"
                     to: "black"
                     duration: 5000
                 }
             }

             property real r: 60
             startX: circ1.width / 2 - r
             startY: circ1.height / 2 - r
             PathArc {
                 x: circ1.width / 2 + p1.r
                 y: circ1.height / 2 + p1.r
                 radiusX: p1.r; radiusY: p1.r
                 useLargeArc: true
             }
             PathArc {
                 x: circ1.width / 2 - p1.r
                 y: circ1.height / 2 - p1.r
                 radiusX: p1.r; radiusY: p1.r
                 useLargeArc: true
             }
         }
     }

     Shape {
         id: circ2
         anchors.fill: parent

         SequentialAnimation on opacity {
             loops: Animation.Infinite
             NumberAnimation { from: 1.0; to: 0.0; duration: 5000 }
             NumberAnimation { from: 0.0; to: 1.0; duration: 5000 }
         }

         ShapePath {
             id: p2
             strokeWidth: -1 // or strokeColor: "transparent"

             SequentialAnimation on fillColor {
                 loops: Animation.Infinite
                 ColorAnimation {
                     from: "gray"
                     to: "purple"
                     duration: 3000
                 }
                 ColorAnimation {
                     from: "purple"
                     to: "red"
                     duration: 3000
                 }
                 ColorAnimation {
                     from: "red"
                     to: "gray"
                     duration: 3000
                 }
             }

             property real r: 40
             startX: circ2.width / 2 - r
             startY: circ2.height / 2 - r
             PathArc {
                 x: circ2.width / 2 + p2.r
                 y: circ2.height / 2 + p2.r
                 radiusX: p2.r; radiusY: p2.r
                 useLargeArc: true
             }
             PathArc {
                 x: circ2.width / 2 - p2.r
                 y: circ2.height / 2 - p2.r
                 radiusX: p2.r; radiusY: p2.r
                 useLargeArc: true
             }
         }
     }
 }