How can I ensure my example sketch in p5.js is functioning properly? What event triggers the execution of the run button function?

When experimenting with the example sketch provided at the following link, I noticed that I needed to click the run button in order for it to function properly:

However, when I copied the code and ran it locally on my localhost, there was no indication of a run button event to kickstart the sketch. What type of event should I use to initiate the sketch?

I believe this crucial information should be included in the sketch description to help users get started quickly. After attempting to find a solution using developer tools, I realized it would be more efficient to seek assistance directly.

let mic;

function setup() {
  createCanvas(710, 200);

  // Create an Audio input
  mic = new p5.AudioIn();

  // Start the Audio Input.
  // By default, it does not .connect() (to the computer speakers)
  mic.start();
}

function draw() {
  background(200);

  // Obtain the overall volume (ranging from 0 to 1.0)
  let vol = mic.getLevel();
  fill(127);
  stroke(0);

  // Display an ellipse with height based on volume
  let h = map(vol, 0, 1, height, 0);
  ellipse(width / 2, h - 25, 50, 50);
}

Answer №1

To initiate the audioContext, it is recommended to begin with a user action. In p5.js, you can achieve this by assigning the following function to an eventListener:

userStartAudio()

Answer №2

If you want to incorporate the p5 dom library in your project, make sure it is included alongside the p5.js file. This can be done automatically if you downloaded the files from the official p5.js website or if you are using the p5js web editor. Otherwise, you will need to manually add it to your HTML code.

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.7.2/addons/p5.dom.min.js"></script>

Once you have added the p5 dom library, you can insert a button tag into the body of your HTML code.

<button id="button" onclick="runCode();"></button>

To make the button functional in JavaScript, you can create a function like this:

function runCode() {
  loop();
}

Additionally, remember to include the following line in your setup function:

noLoop();

This ensures that the setup function runs smoothly after every line of code.

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