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gonejack / pixel.js
Created September 29, 2024 11:25
网页模拟点阵屏
<!doctype html>
<html lang="en">
<body style="background-color: black;">
<div id="screen" style="display: flex; justify-content: center; align-items: center; height: 80vh"></div>
<script>
class TextPointSet {
constructor() {
this.points = {};
this.canvas = document.createElement('canvas');
this.ctx = this.canvas.getContext('2d');
@gonejack
gonejack / main.rs
Created September 30, 2021 04:20
golang like switch in rust
macro_rules! switch {
($($a:expr => $b:expr;)* _ => $e:expr $(,)?) => {
match () {
$(_ if $a => $b,)*
_ => $e,
}
};
}
fn f1() -> bool {
@gonejack
gonejack / shutdown.java
Created May 20, 2019 07:58
Java 关机处理
// 推荐做法：
static class Stop extends Thread {
static void init() {
Runtime.getRuntime().addShutdownHook(new Stop());
}
@Override
public void run() {
Thread.currentThread().setName("stop");
@gonejack
gonejack / .gdbinit
Created January 11, 2018 10:12 — forked from tetsuok/.gdbinit
Turning off optimization and inlining in Go gc compilers for debugging.
source /usr/local/go/src/pkg/runtime/runtime-gdb.py
b main.main
@gonejack
gonejack / Mac_install_golang.md
Last active January 4, 2018 07:18
Homebrew install Golang SDK 
brew install go
export GOROOT="/usr/local/opt/go/libexec"
export GOPATH="$HOME/.go"
export PATH="$PATH:$GOROOT/bin:$GOPATH/bin"
@gonejack
gonejack / ffmpeg.md
Created December 17, 2017 06:23 — forked from v5tech/ffmpeg.md
ffmpeg视频合并、格式转换、截图

使用ffmpeg合并MP4文件

ffmpeg -i "Apache Sqoop Tutorial Part 1.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i "Apache Sqoop Tutorial Part 2.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i "Apache Sqoop Tutorial Part 3.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate3.ts
ffmpeg -i "Apache Sqoop Tutorial Part 4.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate4.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts|intermediate4.ts" -c copy -bsf:a aac_adtstoasc "Apache Sqoop Tutorial.mp4"
@gonejack
gonejack / Install ffmpeg with x265 support
Last active November 30, 2017 11:14 — forked from bbuyukkahraman/Install ffmpeg with x265 support
Install Homebrew OS X package manager:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Install ffmpeg with x265 support:
brew install ffmpeg --with-fdk-aac --with-sdl2 --with-freetype --with-libass --with-libvorbis --with-libvpx --with-opus --with-x265
Convert video to x265:
ffmpeg -i input -c:v libx265 -preset medium -crf 28 -c:a aac -b:a 128k output.mp4
Uninstall ffmpeg:
@gonejack
gonejack / DynamicClassLoading.java
Created August 8, 2017 06:24
public class MainClass {
public static void main(String[] args){
ClassLoader classLoader = MainClass.class.getClassLoader();
try {
Class aClass = classLoader.loadClass("com.jenkov.MyClass");
System.out.println("aClass.getName() = " + aClass.getName());
} catch (ClassNotFoundException e) {
@gonejack
gonejack / img-to-dataurl.js
Last active August 7, 2017 15:52
JS :: convert image to data url with javascript
console.clear();
var img = new Image();
img.src = 'img/img.png';
img.onload = function () {
var canvas = document.createElement('canvas'), context = canvas.getContext('2d');
canvas.width = img.width;
canvas.height = img.height;
context.drawImage(img, 0, 0, img.width, img.height);
console.log(canvas.toDataURL('image/png'));
@gonejack
gonejack / image-url-to-data-uri.js
Created August 7, 2017 15:42 — forked from oliyh/image-url-to-data-uri.js
Convert an image url to a data URI without canvas
// hard won knowledge from http://stackoverflow.com/questions/20035615/using-raw-image-data-from-ajax-request-for-data-uri
var xmlHTTP = xhr.XMLHttpRequest();
xmlHTTP.open('GET', url, true);
xmlHTTP.responseType = 'arraybuffer';
xmlHTTP.onload = function(e) {
var arr = new Uint8Array(this.response);
var raw = String.fromCharCode.apply(null,arr);
var b64 = base64.encode(raw);
var dataURL="data:image/png;base64," + b64;
};