How can I design a JavaScript function that can store and combine multiple SVG or PNG files to play as a GIF or video?

I am working on a project involving a series of squares that can be filled with different colors and saved in the background as PNG format. The goal is to have these colored squares play as a preview when a user clicks next.

I'm currently facing an issue where the provided JS code does not seem to play a gif. I would appreciate any assistance in solving this problem.

function saveSquaresAsPng() {
    // Retrieving all square elements
    const squares = document.querySelectorAll(".square");

    // Iterating through squares to save them as PNGs
    for (let i = 0; i < squares.length; i++) {
        const square = squares[i];

        html2canvas(square).then(canvas => {
            // Converting canvas to PNG data URL
            const pngDataUrl = canvas.toDataURL("image/png");

            // Creating a link to download the PNG file
            const link = document.createElement("a");
            link.download = `square-${i + 1}.png`;
            link.href = `"./images/square-" + (i + 1) + ".png"`;
            link.click();
        });
    }
}

function createGif() {
    // Retrieving all saved PNGs and adding them to the gif
    const gif = new GIF({
        workers: 2,
        quality: 10,
        width: 300,
        height: 300
    });
    for (let i = 1; i <= 3; i++) {
        const img = new Image();
        img.src = `"./images/square-" + i + ".png"`;
        gif.addFrame(img);
    }

     // Rendering the GIF and setting it as the source of the <img> tag
     gif.on('finished', function(blob) {
        const imgTag = document.getElementById("myGif");
        imgTag.src = URL.createObjectURL(blob);
    });

     // Rendering frames into an animated GIF
    gif.render();

    console.log(gif);
}

The objective is to successfully save the squares and play them as a gif.

Answer №1

Here's a snippet of code for you to try out:

function saveSquaresAsPng() {
  // Retrieve all square elements
  const squares = document.querySelectorAll(".square");

  // Iterate through squares and save as PNG
  for (let i = 0; i < squares.length; i++) {
    const square = squares[i];

    html2canvas(square).then(canvas => {
      // Convert canvas to PNG data URL
      const pngDataUrl = canvas.toDataURL("image/png");

      // Create a link to download the PNG file
      const link = document.createElement("a");
      link.download = `square-${i + 1}.png`;
      link.href = `./images/square-${i + 1}.png`;
      link.click();
    });
  }
}

function createGif() {
  // Fetch all saved PNGs and compile them into a GIF
  const gif = new GIF({
    workers: 2,
    quality: 10,
    width: 300,
    height: 300
  });
  for (let i = 1; i <= 3; i++) {
    const img = new Image();
    img.src = `./images/square-${i}.png`;
    img.onload = function() {
      gif.addFrame(img);
    }
  }

  // Generate the GIF and assign it to the <img> tag source
  gif.on('finished', function(blob) {
    const imgTag = document.getElementById("myGif");
    imgTag.src = URL.createObjectURL(blob);
  });

  // Compile frames into an animated GIF
  gif.render();
}

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