Qt 5.9 | Qt 3D | Qt 3D: Audio Visualizer Example | Visualizer.qml Example File

Qt 5.9.3 Reference Documentation

# Visualizer.qml Example File

audio-visualizer-qml/Visualizer.qml

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      import Qt3D.Core 2.0
      import Qt3D.Render 2.0
      import Qt3D.Extras 2.0
      import QtQuick 2.2 as QQ2

      Entity {
          id: sceneRoot
          property int barRotationTimeMs: 1
          property int numberOfBars: 1
          property string animationState: "stopped"
          property real titleStartAngle: 95
          property real titleStopAngle: 5

          onAnimationStateChanged: {
              if (animationState == "playing") {
                  mediaPlayer.play()
                  if (progressTransformAnimation.paused)
                      progressTransformAnimation.resume()
                  else
                      progressTransformAnimation.start()
              } else if (animationState == "paused") {
                  mediaPlayer.pause()
                  if (progressTransformAnimation.running)
                      progressTransformAnimation.pause()
              } else {
                  mediaPlayer.stop()
                  progressTransformAnimation.stop()
                  progressTransform.progressAngle = progressTransform.defaultStartAngle
              }
          }

          QQ2.Item {
              id: stateItem

              state: animationState
              states: [
                  QQ2.State {
                      name: "playing"
                      QQ2.PropertyChanges {
                          target: titlePrism
                          titleAngle: titleStopAngle
                      }
                  },
                  QQ2.State {
                      name: "paused"
                      QQ2.PropertyChanges {
                          target: titlePrism
                          titleAngle: titleStopAngle
                      }
                  },
                  QQ2.State {
                      name: "stopped"
                      QQ2.PropertyChanges {
                          target: titlePrism
                          titleAngle: titleStartAngle
                      }
                  }
              ]

              transitions: QQ2.Transition {
                  QQ2.NumberAnimation {
                      property: "titleAngle"
                      duration: 2000
                      running: false
                  }
              }
          }

          function startVisualization() {
              progressTransformAnimation.duration = mediaPlayer.duration
              mainview.state = "playing"
              progressTransformAnimation.start()
          }

          Camera {
              id: camera
              projectionType: CameraLens.PerspectiveProjection
              fieldOfView: 45
              aspectRatio: 1820 / 1080
              nearPlane: 0.1
              farPlane: 1000.0
              position: Qt.vector3d(0.014, 0.956, 2.178)
              upVector: Qt.vector3d(0.0, 1.0, 0.0)
              viewCenter: Qt.vector3d(0.0, 0.7, 0.0)
          }

          Entity {
              components: [
                  DirectionalLight {
                      intensity: 0.9
                      worldDirection: Qt.vector3d(0, 0.6, -1)
                  }
              ]
          }

          RenderSettings {
              id: external_forward_renderer
              activeFrameGraph: ForwardRenderer {
                  camera: camera
                  clearColor: "transparent"
              }
          }

          components: [external_forward_renderer]

          // Bars
          CuboidMesh {
              id: barMesh
              xExtent: 0.1
              yExtent: 0.1
              zExtent: 0.1
          }

          NodeInstantiator {
              id: collection
              property int maxCount: parent.numberOfBars
              model: maxCount

              delegate: BarEntity {
                  id: cubicEntity
                  entityMesh: barMesh
                  rotationTimeMs: sceneRoot.barRotationTimeMs
                  entityIndex: index
                  entityCount: sceneRoot.numberOfBars
                  entityAnimationsState: animationState
                  magnitude: 0
              }
          }

          // TitlePrism
          Entity {
              id: titlePrism
              property real titleAngle: titleStartAngle

              Entity {
                  id: titlePlane

                  PlaneMesh {
                      id: titlePlaneMesh
                      width: 550
                      height: 100
                  }

                  Transform {
                      id: titlePlaneTransform
                      scale: 0.003
                      translation: Qt.vector3d(0, 0.11, 0)
                  }

                  NormalDiffuseMapAlphaMaterial {
                      id: titlePlaneMaterial
                      diffuse: TextureLoader { source: "qrc:/images/demotitle.png" }
                      normal: TextureLoader { source: "qrc:/images/normalmap.png" }
                      shininess: 1.0
                  }

                  components: [titlePlaneMesh, titlePlaneMaterial, titlePlaneTransform]
              }

              // Song title
              Entity {
                  id: songTitlePlane

                  PlaneMesh {
                      id: songPlaneMesh
                      width: 550
                      height: 100
                  }

                  Transform {
                      id: songPlaneTransform
                      scale: 0.003
                      rotationX: 90
                      translation: Qt.vector3d(0, -0.03, 0.13)
                  }

                  property Material songPlaneMaterial: NormalDiffuseMapAlphaMaterial {
                      diffuse: TextureLoader { source: "qrc:/images/songtitle.png" }
                      normal: TextureLoader { source: "qrc:/images/normalmap.png" }
                      shininess: 1.0
                  }

                  components: [songPlaneMesh, songPlaneMaterial, songPlaneTransform]
              }

              property Transform titlePrismPlaneTransform: Transform {
                  matrix: {
                      var m = Qt.matrix4x4()
                      m.translate(Qt.vector3d(-0.5, 1.3, -0.4))
                      m.rotate(titlePrism.titleAngle, Qt.vector3d(1, 0, 0))
                      return m;
                  }
              }

              components: [titlePlane, songTitlePlane, titlePrismPlaneTransform]
          }

          // Circle to create the reflection effect
          Mesh {
              id: circleMesh
              source: "qrc:/meshes/circle.obj"
          }

          Entity {
              id: circleEntity
              property Material circleMaterial: PhongAlphaMaterial {
                  alpha: 0.4
                  ambient: "black"
                  diffuse: "black"
                  specular: "black"
                  shininess: 10000
              }

              components: [circleMesh, circleMaterial]
          }

          // Progress
          Mesh {
              id: progressMesh
              source: "qrc:/meshes/progressbar.obj"
          }

          Transform {
              id: progressTransform
              property real defaultStartAngle: -90
              property real progressAngle: defaultStartAngle
              rotationY: progressAngle
          }

          Entity {
              property Material progressMaterial: PhongMaterial {
                  ambient: "#80C342"
                  diffuse: "black"
              }

              components: [progressMesh, progressMaterial, progressTransform]
          }

          QQ2.NumberAnimation {
              id: progressTransformAnimation
              target: progressTransform
              property: "progressAngle"
              duration: 0
              running: false
              from: progressTransform.defaultStartAngle
              to: -270
              onStopped: if (animationState != "stopped") animationState = "stopped"
          }
      }