Last active
October 28, 2024 23:01
-
Star
(227)
You must be signed in to star a gist -
Fork
(29)
You must be signed in to fork a gist
-
-
Save wybiral/c8f46fdf1fc558d631b55de3a0267771 to your computer and use it in GitHub Desktop.
Tracking cursor position in real-time with remote monitoring (without JavaScript)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // Tracking cursor position in real-time without JavaScript | |
| // Demo: https://twitter.com/davywtf/status/1124146339259002881 | |
| package main | |
| import ( | |
| "fmt" | |
| "net/http" | |
| "strings" | |
| ) | |
| const W = 50 | |
| const H = 50 | |
| var ch chan string | |
| const head = `<head> | |
| <style> | |
| *{margin:0;padding:0} | |
| html,body{width:100%;height:100%} | |
| p{ | |
| width:10px; | |
| height:10px; | |
| display:inline-block; | |
| border-right:1px solid #666; | |
| border-bottom:1px solid #666 | |
| } | |
| </style> | |
| </head>` | |
| func main() { | |
| ch = make(chan string) | |
| http.HandleFunc("/", handler) | |
| http.ListenAndServe(":8080", nil) | |
| } | |
| func handler(w http.ResponseWriter, r *http.Request) { | |
| p := r.URL.Path | |
| if p == "/" { | |
| index(w, r) | |
| return | |
| } else if p == "/watch" { | |
| watch(w, r) | |
| return | |
| } else { | |
| if strings.HasPrefix(p, "/c") && strings.HasSuffix(p, ".png") { | |
| ch <- p[1 : len(p)-4] | |
| } | |
| } | |
| } | |
| func index(w http.ResponseWriter, r *http.Request) { | |
| w.Header().Set("Content-Type", "text/html; charset=utf-8") | |
| flusher, ok := w.(http.Flusher) | |
| if !ok { | |
| return | |
| } | |
| w.Write([]byte(head)) | |
| flusher.Flush() | |
| // Send <p> grid | |
| w.Write([]byte("<body>\n")) | |
| for i := 0; i < H; i++ { | |
| w.Write([]byte("<div>")) | |
| for j := 0; j < W; j++ { | |
| w.Write([]byte(fmt.Sprintf("<p id=\"c%dx%d\"></p>", i, j))) | |
| } | |
| w.Write([]byte("</div>\n")) | |
| } | |
| w.Write([]byte("</body>\n")) | |
| flusher.Flush() | |
| // Send CSS | |
| w.Write([]byte("<style>")) | |
| for i := 0; i < H; i++ { | |
| for j := 0; j < W; j++ { | |
| id := fmt.Sprintf("c%dx%d", i, j) | |
| s := fmt.Sprintf("#%s:hover{background:url(\"%s.png\")}", id, id) | |
| w.Write([]byte(s)) | |
| } | |
| } | |
| w.Write([]byte("</style>")) | |
| flusher.Flush() | |
| } | |
| func watch(w http.ResponseWriter, r *http.Request) { | |
| w.Header().Set("Content-Type", "text/html; charset=utf-8") | |
| flusher, ok := w.(http.Flusher) | |
| if !ok { | |
| return | |
| } | |
| w.Write([]byte(head)) | |
| flusher.Flush() | |
| // Send <p> grid | |
| w.Write([]byte("<body>\n")) | |
| for i := 0; i < H; i++ { | |
| w.Write([]byte("<div>")) | |
| for j := 0; j < W; j++ { | |
| w.Write([]byte(fmt.Sprintf("<p id=\"c%dx%d\"></p>", i, j))) | |
| } | |
| w.Write([]byte("</div>\n")) | |
| } | |
| w.Write([]byte("</body>\n")) | |
| flusher.Flush() | |
| // Listen to ch for updates and write to response | |
| for p := range ch { | |
| s := fmt.Sprintf("<style>#%s{background:#000}</style>\n", p) | |
| _, err := w.Write([]byte(s)) | |
| if err != nil { | |
| return | |
| } | |
| flusher.Flush() | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
it pretty simple actually there two windows open as we can see in the demo, one move the cursor other one draws