Summarizing Slides as Thumbnails
This is a sample script for summarizing Slides as thumbnails. For example, it supposes a Slides including 15 pages. When this script is run, it summarizes 6 pages to one page as images. I created this because there are no methods for directly achieving this. This is useful for myself. If this is also useful for you, I’m glad.
The flow of this workaround is as follows.
Flow:
- Copy the original Slides file as a temporary file.
- Retrieve images of all slides.
- When the Slides file is exported to PNG file, the top page is exported as PNG file. I used this.
- Put and arrange the retrieved images to the temporary file.
- When the image is inserted to a slide, retrieve the size and change the size, then put the image to the calculated position.
Sample script 1:
function myFunction() {
// Please set these parameters
var id = "### file ID ###"; // file ID of original Slides
var col = 3; // Number of columns
var row = 2; // Number of rows
var wsize = 200; // Size of width of each image (pixels)
var sep = 5; // Space of each image (pexels)
// Create temporary file
var originalFile = DriveApp.getFileById(id);
var tempFile = originalFile.makeCopy();
var idt = tempFile.getId();
// Retrieve slides as images
var s = SlidesApp.openById(idt);
var slides = s.getSlides();
var accessToken = ScriptApp.getOAuthToken();
var baseUrl = "https://docs.google.com/presentation/d/" + idt + "/export/";
var url = baseUrl + "png?access_token=" + accessToken;
var blobs = slides.map(function(e) {
var blob = UrlFetchApp.fetch(url).getBlob();
slides[0].remove();
s.saveAndClose();
s = SlidesApp.openById(idt);
slides = s.getSlides();
return blob;
});
// Put images
var ph = s.getPageHeight();
var pw = s.getPageWidth();
var leftOffset = (pw - ((wsize * col) + (sep * (col - 1)))) / 2;
if (leftOffset < 0) throw new Error("Images are sticking out from a slide.");
var len = col * row;
var loops = Math.ceil(blobs.length / (col * row));
for (var loop = 0; loop < loops; loop++) {
var ns = s.insertSlide(loop);
var topOffset, top;
var left = leftOffset;
for (var i = len * loop; i < len + (len * loop); i++) {
if (i === blobs.length) break;
var image = ns.insertImage(blobs[i]);
var w = image.getWidth();
var h = image.getHeight();
var hsize = h * wsize / w;
if (i === 0 || i % len === 0) {
topOffset = (ph - ((hsize * row) + sep)) / 2;
if (topOffset < 0) throw new Error("Images are sticking out from a slide.");
top = topOffset;
}
image.setWidth(wsize).setHeight(hsize).setTop(top).setLeft(left).getObjectId();
if (i === col - 1 + (loop * len)) {
top = topOffset + hsize + sep;
left = leftOffset;
} else {
left += wsize + sep;
}
}
}
s.saveAndClose();
}
Sample script 2:
When you use this script, please enable Slides API at API console.