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p5.js Image setFrame() Method
  • Last Updated : 23 Sep, 2020

The setFrame() method of p5.Image in p5.js library is used to set the index of the currently visible frame of the GIF animation.

Syntax:

setFrame( index )

Parameters: This function accepts a single parameter as mentioned above and described below.

  • index: It is a number that denotes the index of the frame to be displayed.

The following libraries are included in the “head” section of the HTML page while implementing the following examples.

<script src=”p5.Image.js”></script>
<script src=”p5.min.js”></script>



Example 1: The examples below illustrates the setFrame() method in p5.js library.

Javascript

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function preload() {
  example_gif =
    loadImage("sample-gif.gif");
}
  
function setup() {
  createCanvas(500, 300);
  textSize(18);
  
  example_gif.pause();
  
  decFrameBtn =
    createButton("Skip Backward 10 Frames");
  decFrameBtn.position(30, 240);
  decFrameBtn.mousePressed(skipBackward);
  
  incFrameBtn =
    createButton("Skip Forward 10 Frames");
  incFrameBtn.position(220, 240);
  incFrameBtn.mousePressed(skipForward);
}
  
function draw() {
  clear();
  
  text("Skip frames forward or backward " +
       "by pressing the buttons", 20, 20);
  
  // Draw the GIF on screen
  image(example_gif, 20, 40, 260, 140);
  
  // Get the current frame
  let currFrame =
      example_gif.getCurrentFrame();
  
  text("The current frame is: " +
       currFrame, 20, 200);
}
  
function skipForward() {
  
  // Get the current playing frame of the GIF
  let currFrame =
      example_gif.getCurrentFrame();
  
  // Move forward only if possible
  if (currFrame <
      example_gif.numFrames() - 10) {
        
    // Add 10 to skip forward
    let newFrame = currFrame + 10;
  
    example_gif.setFrame(newFrame);
  }
}
  
function skipBackward() {
  
  // Get the current playing frame of the GIF
  let currFrame =
      example_gif.getCurrentFrame();
  
  // Move forward only if possible
  if (currFrame > 10) {
        
    // Subtract 10 to skip forward
    let newFrame = currFrame - 10;
  
    example_gif.setFrame(newFrame);
  }
}

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Output:

Example 2:

Javascript

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function preload() {
  example_gif =
    loadImage("sample-gif.gif");
}
  
function setup() {
  createCanvas(500, 300);
  textSize(18);
  
  example_gif.pause();
  
  let totalFrames =
      example_gif.numFrames() - 1;
  
  frameSlider = 
    createSlider(0, totalFrames, 0, 1);
  frameSlider.position(30, 240);
  frameSlider.size(250);
}
  
function draw() {
  clear();
  
  text("Move the slider to set the " +
       "current frame of the GIF", 20, 20);
  
  // Draw the GIF on screen
  image(example_gif, 20, 40, 260, 140);
  
  // Set the current frame according to the
  // value of the slider
  example_gif.setFrame(frameSlider.value());
  
  // Get the current frame
  let currFrame =
      example_gif.getCurrentFrame();
  
  text("The current frame is: " +
       currFrame, 20, 220);
}

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Output:

Online editor: https://editor.p5js.org/
Environment Setup: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
Reference: https://p5js.org/reference/#/p5.Image/setFrame

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