p5.js中p5.MediaElement的volume()方法用於設置或返回媒體元素的當前音量。可以使用介於0.0和1.0之間的值來指定體積,其中0.0表示介質中沒有體積,而值1.0表示最大體積。任何中間值均可用於指定所需的體積。
可以通過不向該函數傳遞任何參數來返回當前的介質體積。
用法:
volume( val )
參數:此方法接受如上所述和以下描述的單個參數:
- val:該數字指定要設置的音量。體積可以在0.0到1.0之間。它是一個可選參數。
返回值:此方法返回一個Number,表示媒體元素的當前體積。
以下示例說明了p5.js中的volume()方法:
範例1:
Javascript
let currVolume = 0.5;
function setup() {
createCanvas(500, 400);
textSize(18);
text("Click on the buttons to increase " +
"or decrease the volume", 20, 20);
example_media =
createVideo("sample-video.mp4");
example_media.size(500, 300);
example_media.position(20, 100);
example_media.showControls();
example_media.volume(currVolume);
incBtn = createButton("Increase Volume");
incBtn.position(30, 40);
incBtn.mousePressed(incVol);
decBtn = createButton("Decrease Volume");
decBtn.position(160, 40);
decBtn.mousePressed(decVol);
text("The video is playing at " +
"half volume", 20, 80);
}
function incVol() {
clear();
if (currVolume < 0.9)
currVolume += 0.1;
// Set the new higher volume
example_media.volume(currVolume);
text("The volume has been increased",
20, 80);
text("Click on the buttons to increase " +
"or decrease the volume", 20, 20);
}
function decVol() {
clear();
if (currVolume > 0.1)
currVolume -= 0.1;
// Set the new lower volume
example_media.volume(currVolume);
text("The volume has been decreased",
20, 80);
text("Click on the buttons to increase " +
"or decrease the volume", 20, 20);
}
輸出:
範例2:
Javascript
function setup() {
createCanvas(500, 400);
textSize(20);
text("Move the slider to increase or " +
"decrease the volume", 20, 20);
example_media =
createVideo("sample-video.mp4");
example_media.size(500, 300);
example_media.position(20, 80);
example_media.showControls();
volSlider =
createSlider(0.0, 1.0, 0.5, 0.1);
volSlider.position(20, 40);
volSlider.input(changeVol);
}
function changeVol() {
clear();
let volumeVal = volSlider.value();
// Set the media volume to the slider value
example_media.volume(volumeVal);
// Get the current volume
let currVolume = example_media.volume();
text("Move the slider to increase or " +
"decrease the volume", 20, 20);
text("Video is playing at volume:" +
currVolume, 20, 80);
}
輸出:
在線編輯: https://editor.p5js.org/
環境設置: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
參考: https://p5js.org/reference/#/p5.MediaElement/volume
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注:本文由純淨天空篩選整理自sayantanm19大神的英文原創作品 p5.MediaElement volume() Method。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。