BarEntity.qml Example File

audio-visualizer-qml/BarEntity.qml
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import Qt3D.Core 2.0 import Qt3D.Render 2.0 import Qt3D.Extras 2.0 import QtQuick 2.4 as QQ2 Entity { property int rotationTimeMs: 0 property int entityIndex: 0 property int entityCount: 0 property int startAngle: 0 + 360 / entityCount * entityIndex property bool needsNewMagnitude: true property real magnitude: 0 property real animWeight: 0 property color lowColor: "black" property color highColor: "#b3b3b3" property color barColor: lowColor property string entityAnimationsState: "stopped" property bool entityAnimationsPlaying: true property var entityMesh: null onEntityAnimationsStateChanged: { if (animationState == "paused") { if (angleAnimation.running) angleAnimation.pause() if (barColorAnimations.running) barColorAnimations.pause() } else if (animationState == "playing"){ needsNewMagnitude = true; if (heightDecreaseAnimation.running) heightDecreaseAnimation.stop() if (angleAnimation.paused) { angleAnimation.resume() } else if (!entityAnimationsPlaying) { magnitude = 0 angleAnimation.start() entityAnimationsPlaying = true } if (barColorAnimations.paused) barColorAnimations.resume() } else { if (animWeight != 0) heightDecreaseAnimation.start() needsNewMagnitude = true angleAnimation.stop() barColorAnimations.stop() entityAnimationsPlaying = false } } property Material barMaterial: PhongMaterial { diffuse: barColor ambient: Qt.darker(barColor) specular: "black" shininess: 1 } property Transform angleTransform: Transform { property real heightIncrease: magnitude * animWeight property real barAngle: startAngle matrix: { var m = Qt.matrix4x4() m.rotate(barAngle, Qt.vector3d(0, 1, 0)) m.translate(Qt.vector3d(1.1, heightIncrease / 2 - heightIncrease * 0.05, 0)) m.scale(Qt.vector3d(0.5, heightIncrease * 15, 0.5)) return m; } property real compareAngle: barAngle onBarAngleChanged: { compareAngle = barAngle if (compareAngle > 360) compareAngle = barAngle - 360 if (compareAngle > 180) { parent.enabled = false animWeight = 0 if (needsNewMagnitude) { // Calculate the ms offset where the bar will be at the center point of the // visualization and fetch the correct magnitude for that point in time. var offset = (90.0 + 360.0 - compareAngle) * (rotationTimeMs / 360.0) magnitude = mediaPlayer.getNextAudioLevel(offset) needsNewMagnitude = false } } else { parent.enabled = true // Calculate a power of 2 curve for the bar animation that peaks at 90 degrees animWeight = Math.min((compareAngle / 90), (180 - compareAngle) / 90) animWeight = animWeight * animWeight if (!needsNewMagnitude) { needsNewMagnitude = true barColorAnimations.start() } } } } components: [entityMesh, barMaterial, angleTransform] QQ2.NumberAnimation { id: angleAnimation target: angleTransform property: "barAngle" duration: rotationTimeMs loops: QQ2.Animation.Infinite running: true from: startAngle to: 360 + startAngle } QQ2.NumberAnimation { id: heightDecreaseAnimation target: angleTransform property: "heightIncrease" duration: 400 running: false from: angleTransform.heightIncrease to: 0 onStopped: barColor = lowColor } property int animationDuration: angleAnimation.duration / 6 QQ2.SequentialAnimation on barColor { id: barColorAnimations running: false QQ2.ColorAnimation { from: lowColor to: highColor duration: animationDuration } QQ2.PauseAnimation { duration: animationDuration } QQ2.ColorAnimation { from: highColor to: lowColor duration: animationDuration } } }

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