Skip to content

Instantly share code, notes, and snippets.

View redblobgames's full-sized avatar
🥰

Amit Patel redblobgames

🥰
1k followers · 10 following
View GitHub Profile
@redblobgames
redblobgames / README.md
Created April 29, 2023 23:19
Three-Rhombus storage of a hex map

Reddit user /u/GavrielBA is using three rhombuses to store a hexagon-shaped map

@redblobgames
redblobgames / Test.cs
Last active October 21, 2022 23:58
C# distance test, are Abs, Pow, or Sqrt slow? Yes - Pow(v,2) is much slower than v*v
using System;
using System.Numerics;
static bool InDistance1(Vector2 pos1, Vector2 pos2, float maxDistance) {
var distance = Math.Sqrt(Math.Pow(Math.Abs(pos2.X - pos1.X), 2) + Math.Pow(Math.Abs(pos2.Y - pos1.Y), 2));
return distance <= maxDistance;
}
static bool InDistance2(Vector2 pos1, Vector2 pos2, float maxDistance) {
var distanceSquared = (pos2.X - pos1.X) * (pos2.X - pos1.X) + (pos2.Y - pos1.Y) * (pos2.Y - pos1.Y);
@redblobgames
redblobgames / .block
Last active September 30, 2022 16:42 — forked from HarryStevens/.block
Voronoi Jiggle
license: gpl-3.0
@redblobgames
redblobgames / treedemo.as
Created June 2, 2022 04:37
Tree generator I wrote in 2011 - but it's for Flash
// Draw simple trees
// Author: amitp@cs.stanford.edu
// License: MIT
// TODO: read http://procworld.blogspot.com/2011/04/tree-bits.html
// TODO: read http://procworld.blogspot.com/2011/05/mango-sequoia-baobab.html
package {
import flash.display.*;
import flash.geom.Point;
@redblobgames
redblobgames / sfc32.ts
Created May 10, 2022 16:21
sfc32 random number generator, typescript
// SFC32 random number generator, public domain code adapted
// from https://github.com/bryc/code/blob/master/jshash/PRNGs.md
function PRNG(seed: number): {
nextInt(): number;
nextFloat(): number;
getState(): number[];
setState(state: number[]): void
} {
let a = 0, b = seed, c = 0, d = 1;
function sfc32() {
@redblobgames
redblobgames / for.js
Created March 22, 2022 02:16
for loop comparison - probably poor benchmarking on my part
(function() {
let array = [];
for (let i = 0; i < 10000000; ++i) {
array.push({
a: i,
b: i / 2,
r: 0,
});
}
@redblobgames
redblobgames / hyphens.html
Last active November 27, 2021 17:40
Hyphen rendering messed up on my machine
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<style>
p {
max-width: 30em;
hyphens: auto; -webkit-hyphens: auto;
font-family: Arial;
}
@redblobgames
redblobgames / my-notes.el
Last active January 31, 2022 23:09
My note taking setup in emacs
;;; my-notes.el ---
;;; Commentary:
;; My notes, inspired by org-roam, but built on other packages I already use.
;;
;; 1. Capture into a queue (org-capture)
;; 2. Review queue (org-agenda)
;; 3. Find note (find-file in folder).
;; 4. Make new note. Fill with title, date.
@redblobgames
redblobgames / my-diary.el
Last active November 19, 2022 17:50
my journal code
;;; my-diary.el ---
;;; Commentary:
;; My daily diary, inspired by org-journal, but customized for my needs.
;;
;; My keybindings: H-j to open the diary file (global binding), then
;; H-j to add an entry (local binding). C-c C-b, C-c C-f to move days
;; (like org-journal). H-i to search previous headings for completion,
;; so that I can reuse headings and then analyze them.
@redblobgames
redblobgames / main-legion.rs
Created November 5, 2020 17:22
Experiment: Legion ECS vs using Rust enum + pattern matching
use legion::*;
use rltk::{GameState, Rltk, VirtualKeyCode, RGB};
use std::cmp::{max, min};
mod map;
pub use map::*;
struct Player {}
#[derive(PartialEq, Copy, Clone)]