PannerNode.refDistance

在此页

句法
范例
规范
浏览器兼容性
另请参阅
相关话题

refDistance 特性为 PannerNode interface is a double value representing the reference distance for reducing volume as the audio source moves further from the listener – i.e. the distance at which the volume reduction starts taking effect. This value is used by all distance models.

refDistance property's default value is 1 .

句法

var audioCtx = new AudioContext();
var panner = audioCtx.createPanner();
panner.refDistance = 1;

值

A non-negative number. If the value is set to less than 0, a RangeError is thrown.

异常

RangeError

范例

This example demonstrates how different values of refDistance affect how the volume of a sound decays as it moves away from the listener. Unlike rolloffFactor , changing this value also delays the volume decay until the sound moves past the reference point.

const context = new AudioContext();
// all our test tones will last this many seconds
const NOTE_LENGTH = 6;
// this is how far we'll move the sound
const Z_DISTANCE = 20;
// this function creates a graph for the test tone with a given refDistance
// and schedules it to move away from the listener along the Z (depth-wise) axis
// at the given start time, resulting in a decrease in volume (decay)
const scheduleTestTone = (refDistance, startTime) => {
  const osc = new OscillatorNode(context);
  const panner = new PannerNode(context);
  panner.refDistance = refDistance;
  // set the initial Z position, then schedule the ramp
  panner.positionZ.setValueAtTime(0, startTime);
  panner.positionZ.linearRampToValueAtTime(Z_DISTANCE, startTime + NOTE_LENGTH);
  osc.connect(panner)
     .connect(context.destination);
  osc.start(startTime);
  osc.stop(startTime + NOTE_LENGTH);
};
// this tone should decay immediately and fairly quickly
scheduleTestTone(1, context.currentTime);
// this tone should decay slower and later than the previous one
scheduleTestTone(4, context.currentTime + NOTE_LENGTH);
// this tone should decay only slightly, and only start decaying fairly late
scheduleTestTone(7, context.currentTime + NOTE_LENGTH * 2);

After running this code, the resulting waveforms should look something like this:

A waveform visualisation of three oscillator tones produced in Web Audio. Each oscillator moves away from the listener at the same speed, but with different refDistances affecting the resulting volume decay.

规范

规范	状态	注释
Web 音频 API The definition of 'refDistance' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`refDistance`	Chrome 14	Edge 12	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0

图例

完整支持
不支持
兼容性未知 ?

另请参阅

元数据

最后修改： 2020 年 1 月 22 日

Web 音频 API
PannerNode
构造函数
1. PannerNode()
特性
1. coneInnerAngle
2. coneOuterAngle
3. coneOuterGain
4. distanceModel
5. maxDistance
6. orientationX
7. orientationY
8. orientationZ
9. panningModel
10. positionX
11. positionY
12. positionZ
13. refDistance
14. rolloffFactor
方法
继承：
1. AudioNode
2. EventTarget
Related pages for Web Audio API

在此页

句法

值

异常

范例

规范

浏览器兼容性

图例

另请参阅

相关话题