- Qt 5.5
- Qt Canvas 3D
- Planets Example
- FpsDisplay.qml Example File
- Qt 5.5.1 Reference Documentation

# FpsDisplay.qml Example File

canvas3d/threejs/planets/FpsDisplay.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtCanvas3D module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL3$
    ** Commercial License Usage
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    ** GNU Lesser General Public License Usage
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    ** ensure the GNU Lesser General Public License version 3 requirements
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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;
            }
        }
    }