# Animating Shapes
One of the nice aspects of using Qt Quick Shapes, is that the paths drawn are defined directly in QML. This means that their properties can be bound, transitioned and animated, just like any other property in QML.
In the example below, we reuse the basic shape from the very first section of this chapter, but we introduce a variable, t, that we animate from 0.0 to 1.0 in a loop. We then use this variable to offset the position of the small circles, as well as the size of the top and bottom circle. This creates an animation in which it seems that the circles appear at the top and disappear towards the bottom.
import QtQuick
import QtQuick.Shapes
Rectangle {
id: root
width: 600
height: 600
Shape {
anchors.centerIn: parent
ShapePath {
id: shapepath
property real t: 0.0
NumberAnimation on t { from: 0.0; to: 1.0; duration: 500; loops: Animation.Infinite; running: true }
strokeWidth: 3
strokeColor: "darkGray"
fillColor: "lightGray"
startX: -40; startY: 200
// The circle
PathArc { x: 40; y: 200; radiusX: 200; radiusY: 200; useLargeArc: true }
PathLine { x: 40; y: 120 }
PathArc { x: -40; y: 120; radiusX: 120; radiusY: 120; useLargeArc: true; direction: PathArc.Counterclockwise }
PathLine { x: -40; y: 200 }
// The dots
PathMove { x: -20+(1.0-shapepath.t)*20; y: 80 + shapepath.t*50 }
PathArc { x: 20-(1.0-shapepath.t)*20; y: 80 + shapepath.t*50; radiusX: 20*shapepath.t; radiusY: 20*shapepath.t; useLargeArc: true }
PathArc { x: -20+(1.0-shapepath.t)*20; y: 80 + shapepath.t*50; radiusX: 20*shapepath.t; radiusY: 20*shapepath.t; useLargeArc: true }
PathMove { x: -20; y: 130 + shapepath.t*50 }
PathArc { x: 20; y: 130 + shapepath.t*50; radiusX: 20; radiusY: 20; useLargeArc: true }
PathArc { x: -20; y: 130 + shapepath.t*50; radiusX: 20; radiusY: 20; useLargeArc: true }
PathMove { x: -20; y: 180 + shapepath.t*50 }
PathArc { x: 20; y: 180 + shapepath.t*50; radiusX: 20; radiusY: 20; useLargeArc: true }
PathArc { x: -20; y: 180 + shapepath.t*50; radiusX: 20; radiusY: 20; useLargeArc: true }
PathMove { x: -20+shapepath.t*20; y: 230 + shapepath.t*50 }
PathArc { x: 20-shapepath.t*20; y: 230 + shapepath.t*50; radiusX: 20*(1.0-shapepath.t); radiusY: 20*(1.0-shapepath.t); useLargeArc: true }
PathArc { x: -20+shapepath.t*20; y: 230 + shapepath.t*50; radiusX: 20*(1.0-shapepath.t); radiusY: 20*(1.0-shapepath.t); useLargeArc: true }
}
}
}Notice that instead of using a NumberAnimation on t, any other binding can be used, e.g. to a slider, an external state, and so on. Your imagination is the limit.
