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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
            }
        }
    }
}