Qt 5.9 | Qt 3D | Qt 3D: Planets QML Example | FpsDisplay.qml Example File

Qt 5.9.3 Reference Documentation

# FpsDisplay.qml Example File

planets-qml/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: "#5500FF00"
              property color minFpsColor: "#55FF0000"

              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
              }
          }
      }