FpsDisplay.qml Example File

threejs/planets/FpsDisplay.qml
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import QtQuick 2.0 Item { id: fpsDisplayControl property bool hidden: true property real fps: 0.0 onHiddenChanged: { if (fpsDisplayControl.hidden) fpsDisplay.color = "transparent"; else fpsDisplay.color = "#000000FF"; } onFpsChanged: { fpsDisplay.updateFps(); } Rectangle { anchors.fill: parent id: fpsDisplay color: "transparent" property real maxFps: 60.0 property color maxFpsColor: "#00FF00" property color minFpsColor: "#FF0000" function updateFps() { var scale = (fps > maxFps)?1.0:(fps/maxFps); var r = (1 - scale) * minFpsColor.r + scale * maxFpsColor.r; var g = (1 - scale) * minFpsColor.g + scale * maxFpsColor.g; var b = (1 - scale) * minFpsColor.b + scale * maxFpsColor.b; var a = (1 - scale) * minFpsColor.a + scale * maxFpsColor.a; fpsCauge.height = scale * fpsDisplay.height; fpsCauge.color = Qt.rgba(r,g,b,a); } Rectangle { id: fpsCauge width: parent.width anchors.bottom: parent.bottom visible: !fpsDisplayControl.hidden } Text { id: fpsText text: ""+(fps | 0) font.family: "Helvetica" font.pixelSize: 16 font.weight: Font.Light color: "white" anchors.fill: parent verticalAlignment: Text.AlignVCenter horizontalAlignment: Text.AlignHCenter visible: !fpsDisplayControl.hidden } } MouseArea { anchors.fill: parent onClicked: { fpsDisplayControl.hidden = !fpsDisplayControl.hidden; } } }