discord.js 将图像放在另一个图像上

Question

I've been trying to make a command that when you send an image or a url of an image it puts that image on another image that I already have in the code and I keep getting errors every time I try changing it to either imageTemp (which is the image you put your image on) or image`` or messageAttachment```. I'll put my code below so you could see what the problem is.

const { MessageAttachment } = require('discord.js');
const Jimp = require('jimp');
const discord = require('discord.js')

module.exports = {
  name: "img",
  aliases: [],
  run: async (client, message, args) => {
    let messageAttachment = message.attachments.size > 0 ? message.attachments.array()[0].url : null
    try {
      let imageTemp = "https://upload.wikimedia.org/wikipedia/commons/8/8a/Banana-Single.jpg"
      let image = await Jimp.read(messageAttachment);
      let buffer = await image.getBufferAsync(Jimp.MIME_JPEG);

    Jimp.read(imageTemp).then(image => {
    image.composite(messageAttachment, 10, 10)
    })

      message.channel.send(new MessageAttachment(buffer));
    } catch (err) {
      console.log(err);
      message.channel.send('Oops, there was an error. Try inputting the command again.');
    }
  },
};

And here's the result and the errors I get https://imgur.com/a/C6RcTOf

Answer 1

The Jimp.composite() method accepts a Jimp image object as its first argument. Not an url ( messageAttachment ) as you are passing in. Also you are saving the image to buffer before you modify it.

And the error you mentioned occurs when messageAttachment is null . You should check and return if the message has no attachments.

const imageTemp = "https://upload.wikimedia.org/wikipedia/commons/8/8a/Banana-Single.jpg";
const messageAttachment = message.attachments.size > 0 ? message.attachments.array()[0].url : null;

// Exit if there is no message attachment present in the message
if (!messageAttachment) return;

// Resolve the temporary image url to Jimp object
const firstImage = await Jimp.read(imageTemp);
// Resolve the message attachment image url to Jimp object
const secondImage = await Jimp.read(messageAttachment);

// Composite the two images together (modifies the firstImage object)
firstImage.composite(secondImage, 10, 10);

// Save the resulting image to buffer
const buffer = await firstImage.getBufferAsync(Jimp.MIME_JPEG);

// Send the buffer as a message attachment
message.channel.send("Combined image:", {files: [{ attachment: buffer }]});