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问题 I'm using the stateless functional component to add spinner while image is loading from the external resource, like so: function ExternalImage(props) { const [loaded, setLoaded] = useState(false); function onLoad() { console.log('loaded'); setLoaded(true); } return loaded ? <img onLoad={onLoad} src={props.src} alt={props.alt} {...props} /> : <Spin /> } And use it like so: <ExternalImage src={image.src} alt={image.alt} className="image" /> Why would the onLoad never get called? 回答1: When image

问题 I'm using the stateless functional component to add spinner while image is loading from the external resource, like so: function ExternalImage(props) { const [loaded, setLoaded] = useState(false); function onLoad() { console.log('loaded'); setLoaded(true); } return loaded ? <img onLoad={onLoad} src={props.src} alt={props.alt} {...props} /> : <Spin /> } And use it like so: <ExternalImage src={image.src} alt={image.alt} className="image" /> Why would the onLoad never get called? 回答1: When image

问题 Open issue at GitHub I am using HTML/CSS to create PDF views. So, In some cases we need render images from the local asset-folder. When we try to render the file from assets folder image is not displaying. How to resolve this issue? iOS-Screenshot: Full Source Code: RenderHtml.dart import 'package:flutter/material.dart'; import 'dart:async'; import 'dart:io'; import 'package:flutter_full_pdf_viewer/flutter_full_pdf_viewer.dart'; import 'package:flutter_html_to_pdf/flutter_html_to_pdf.dart';

问题 I just spent an infuriating day trying to make a gif out of a series of jpg files in R. I installed ImageMagick to run the following code: system("convert -delay 40 *.png example_4.gif") but I get the following error message: Warning message: running command 'convert -delay 40 *.png example_4.gif' had status 4 which looks like a path error. Now I've looked for convert in the Imagemagick download and can't see it anywhere. Does anyone know where it is? Alternately, is there another easier

问题 I just spent an infuriating day trying to make a gif out of a series of jpg files in R. I installed ImageMagick to run the following code: system("convert -delay 40 *.png example_4.gif") but I get the following error message: Warning message: running command 'convert -delay 40 *.png example_4.gif' had status 4 which looks like a path error. Now I've looked for convert in the Imagemagick download and can't see it anywhere. Does anyone know where it is? Alternately, is there another easier

问题 I want to put/wrap images to 3D objects. To keep things simple and fast, instead of using(and learning) a 3D library I want to use mapping images. Mapping images are used in such a way: So you generate the mapping images once for each object and use the same mapping for all images you want to wrap. My question is how can I generate such mapping images (given the 3D model)? Since I don't know about the terminology my searches failed me. Sorry if I am using the wrong jargon. Below you can see a

问题 I want to put/wrap images to 3D objects. To keep things simple and fast, instead of using(and learning) a 3D library I want to use mapping images. Mapping images are used in such a way: So you generate the mapping images once for each object and use the same mapping for all images you want to wrap. My question is how can I generate such mapping images (given the 3D model)? Since I don't know about the terminology my searches failed me. Sorry if I am using the wrong jargon. Below you can see a

问题 In react-native , converting an image to BASE64 format is easy, with a little help of react-native-fetch-blob , I simply do: RNFetchBlob.fs.readFile(filePath, 'base64') .then((data) => console.log(data)); But, what about the other way around? I know there are some packages out there that does it, but I wonder if it's possible to do it with only react-native-fetch-blob or react-native-fs ? What I want is that after converting and saving the BASE64 image to a file, I am able to display it like

问题 In react-native , converting an image to BASE64 format is easy, with a little help of react-native-fetch-blob , I simply do: RNFetchBlob.fs.readFile(filePath, 'base64') .then((data) => console.log(data)); But, what about the other way around? I know there are some packages out there that does it, but I wonder if it's possible to do it with only react-native-fetch-blob or react-native-fs ? What I want is that after converting and saving the BASE64 image to a file, I am able to display it like

问题 If I have a list of images represented by 3D ndarray such as [[x,y,color],...] , what operations can I use to output an image with values that are median of all values? I am using a for loop and find it too slow. 回答1: You said your images in color, formatted as a list of 3d ndarrays . Let's say there are n images: imgs = [img_1, ..., img_n] Where imgs is a list and each img_i is a an ndarray with shape (nrows, ncols, 3) . Convert the list to a 4d ndarray, then take the median over the